SE534743C2 - Arrangement for filtering a liquid by means of a granular or particulate filter material arranged in a rotatable container and for cleaning a filter material thus used - Google Patents

Abstract

An arrangement for filtering off particle-shaped impurities from a particle-containing and/or contaminating liquid for forming thereof a cleansed and a particle-relieved liquid as a permeate while utilizing a filtering unit. The filtering unit comprises at least one inlet for the particle-containing liquid and at least one outlet for the cleansed and particle- relieved liquid and at least one filtering means, wherein said filtering means exhibits a form concurring with a "closed" container, whose enclosing inner surface encloses a space intended for the filtering process itself. Said space being adapted to support a filtering means formed as a filtering bed of granular filtering material! (free filtering particles) utilizable for the filtering effect itself, said material or particles having a compactness (density) exceeding the compactness (density) of the liquid, and wherein said outlet is connected to a pipe adapted to pass through said filtering bed of the filtering material. A closed container, as a hollow-shaped cylinder (6), is adapted to be rotatable around its only inlet first pipe (18), extending between its wall sections, during a filtering process of said granular filtering bed (9) and its particles and that at a stand still position an only outlet second pipe (10), extending between its wall sections, is peripherally oriented within said closed container and adjacent the bottom of the cylinder and covered by said filtering bed and its filtering particles. In that stand still position the arrangement is adapted to offering a cleansing function corresponding to a "Dead end" cleansing process and/or a "Cross flow" cleansing process.

Description

The particle filtering means within a filtration unit must then have a shape, adjoining a "closed" container, the mantle surface (and ends) of which allow a space intended for the filtration itself to enclose.

The said space is then adapted to enclose and support a granular material, which can be utilized for the self-altering effect.

Filtering materials of this kind exist in various forms and embodiments of free filter particles, such as sand, glass, anthracite and the like, usually intended for a coarse filtration, and for a more neutral filtration powder, such as alumina lÅlzOal.

The free filter particles will hereinafter be abbreviated as "filter particles".

For the practical application of the invention, utilized particulate particles must be assigned a density in excess of the density of the particulate liquid.

The filtration unit shall be provided with an outlet for the particle-free liquid and to said outlet a pipe shall then be connected, adapted to pass through a bed of the filter material formed as particles, an filter bed or a filter bed.

Particle-loaded liquid must thus pass through the bed of filtering material or filter particles, the particles sticking to and between the filter particles and leaving the filter bed as a particle-free or particle-cleaned liquid, an filtrate or a penneate.

The claims: In accordance with the conditions of the present invention, the following description is introduced and the following in the claims; "A". A particle-loaded liquid.

"B". A particle-free liquid.

(The liquid that has passed through the particles of the filter and the filter bed and is called the filtrate or "permeate").

"C". A liquid loaded with a concentrated proportion of particles.

(The volume of liquid which is above the particulate matter or bed and which in principle constitutes the particulate liquid, according to “A” above, but with a removed proportion of filtrate or permeate and with a higher particle concentration than the particulate liquid. ) "D". During the actual filtration within the filter bed, there was a volume of liquid.

(The volume of liquid which is located within the particulate matter and the bed, and which holds the largest proportion of particles between and on the bed.

"E". A sludge-shaped liquid volume.

(Filtered particles are present in a very high concentration within a liquid and are stored and coordinated in a tank or within the filtration unit, for removal).

"F". "Membrane".

(Membrane is usually a thin film, a partition, which is also used in conventional membrane filtration. According to the instructions of the invention, however, "membrane" should be interpreted as "a suspensible membrane" in view of the state of the art. "Permeat" which is only accepted in a membrane filtration also interpreted as at altrate.) These different liquids with liquid volumes assigned different particle concentrations are entered as "B", "C", "D" and "E" in Figures 1 and 2. BACKGROUND OF THE INVENTION Methods, arrangements and constructions, related to the above-mentioned technical field and with a function and a nature that meets the set requirements, are previously known in a number of different embodiments.

As an example of the background of the technology and the technical field to which the invention relates, a number of different arrangements can be mentioned, in order to form an blter bed with the aid of free ochlter particles and to remove or bortlter away them as particles formed and processed from a particle-laden liquid. the pollutants.

In the case of particle cleaning arrangements and filtration units. designed as above, they are previously known to allow these to be included in different facilities and be designed in different ways.

The prior art includes various designs for realizing filtration effects via a first filtration process, joining a "Dead end" process, or a second filtration process, joining a "Cross-ow" process , the principal differences of which are illustrated in Figure 1, using an "filtering membrane" or alternatively a filter bed.

It is also known to continuously have the actual filtration process realized, however, with time-short interruptions for a cleaning process, i.e. allow to rinse clean and wash off concentrated particles from the filter bed and its filter particles.

A simple variant is to have a fixed bed of filter particles applied to a container, with a perforated bottom and a screen, and to allow a particle-laden liquid to be drained through the bed and pass out through the perforations and via the screen cloth, to form a particle-free liquid. , a filtrate or a permeate.

Plants of this type require a relatively large surface area and a depth for the filter bed to be able to purify large amounts of particle-loaded liquid per unit time with a high particle concentration and also require a long time for its purification or cleaning process. It is also known to have a rotatable container (drum) utilized with the filter particles enclosed within the container and to allow a particle separation to take place partly from outside and during a vertical and / or horizontal rotational movement of the container.

It is also known to have a rotatable container or drum inserted inside a container or a sediment enclosing a tank, the particle-laden liquid first having to be fed to a silele element near and outside the periphery of the rotatable drum and then passing through a filter bed. of filter particles, coordinated inside the drum.

It is also known to connect the particle-free liquid, the filtrate or permeate, to a source of negative pressure, said liquid during a forced passage normally having smaller proportions of particles and / or filter particles, as undesirable impurities within the filtrate or permeate.

An arrangement is also known from the patent publication WO 00166246 (SE-514 311-C2). where the particles of contaminated liquids are filtered off by allowing liquid from outside to pass through the periphery of a drum horizontally oriented and rotatably mounted in a tank, which, to a part of its volume, is filled with higher density filter particles, such as sand or similar, than the density assigned to the liquid to be filtered.

In this known method the drum is kept rotating during the filtration process at a speed which by centrifugal force creates a bed of filter particles of a certain thickness closest to the inner periphery of the drum, so that a central filtrate chamber is formed radially inside the bed, from which the filtered liquid can be diverted a filtrate or perneat outlet.

When the filter bed after a while has become clogged with trapped particles and particulate sludge. the filter bed is cleaned by interrupting the rotation of the drum, so that the bed is shaved and stirred while releasing the sludge thus collected, which can be drained out via a sludge drain in the drum and an filtration tank containing and enclosing the drum. However, this known method with a rotating drum and a heavy alter bed requires relatively high energy consumption during operation and can also cause balancing and vibration problems as well as undesirable liquid turbulences within the tank.

It is also known to allow said filtration unit, in the form of a container and / or a rotatable drum, to have at least one inlet for the particle-loaded liquid, at least one outlet for the particle-free liquid and at least one filtering liquid. part, in the form of individual and coordinated free, the agent assigned, filter particles and where the drum is provided with a brush that allows the screen surface to be kept clean.

The said filtration unit must then have a shape, adjoining a “closed” container, the circumferential inner outer surface of which with its end portions allows to enclose a space intended for the actual filtration.

It is also known that in conventional bed filters, such as sand filters, challenges arise with extremely heavy, fast-settling small particles, as they cannot be washed clean.

The prior art also includes the device shown and described in patent publication GB-2 141 039 A.

The device described here will, similar to the present invention, use a substantially horizontally oriented and rotatably arranged drum (3) with an enclosed filtering layer (1), where this filtering layer (1) is built up of granulated filter material within a space ( 2) and where the drum (3) is rotatably arranged about its own center axis.

A first water-carrying pipe (5) extends coaxially into the drum (3), with a branch (4), which is adapted to extend radially outwards and into the space (2) in order to be able to introduce contaminated water or raw water into in the drum (3), for a purification therein and for draining waste water out of the drum (3).

A second water-carrying tube (7) extends coaxially into the drum (3), with a branch (6) which is adapted to extend radially outwards and into the alter bed (1). filtering the layer, in order to be able to remove purified water out of the drum (3) and supply washing water into the drum (3).

The drum (3) is rotatably arranged around the first and the second water-carrying pipes (5, 7), which are fixedly supported by supports (8).

Here it is instructed that the drum (3) should only be under one rotation during the purification process itself.

The drum (3) could also be rotatably arranged within a water tank.

This patent publication provides an arrangement for primarily being able to wash the fil-treating layer (1), which is enclosed in the tank (3) and secondarily create a purification of contaminated water.

Raw water to be purified is pumped through the first pipe (5) and its' U-shaped branch (4) into the space (2) in the drum (3), filtered by the filtering layer (1) while draining purified water through the second pipe (7) and its' U-shaped branch (6).

The first (4) and the second (6) “U-shaped branches are diametrically oriented and axially displaced within the drum (3).

The second branch (6) has an axially oriented pipe section (11), with a plurality of holes or recesses (10), and this pipe section (11) is enclosed by a tubular pocket (12) with a filter cloth (13) and which during friction must be in contact with the pipe section (11) even during the time sections when the granular filtering material (1) is washed.

Here, drum-peripheral wings (14) are also indicated, in order to contribute with a stirring of the materiallter material (1) during the rotational movement of the drum (3).

The function of this arrangement is described on page 2, lines 40 to 49. M3 Raw water is fed continuously, by means of a pump, through the first pipe section (5) and its first branch (4) into the drum ( 3).

The raw water is fed, filtered and drained as it flows from the first pipe (5) and the branch (4) to the space (2) and to the surface of the filter material (1), to and through the filtering tank (12) within the filter bed (1). ), to the second pipe section (6) and to the second pipe (7), in accordance with what is illustrated in the drawings with solid lines.

The granular filter material (1) must be washed while the drum (3) rotates at the same time as the raw roll is continuously fed via the second tube (7) and into the drum (3) - During the rotating movement of the drum (3) the granular filter material (1) to be distributed in the manner indicated by solid lines in fi guren 2 and creates conditions for dirt to be separated from the granular filtermaterial (1), by the frictional interaction that will act between the individual grains.

The dirt accumulations thus separated are drained through washing water supplied to the drum (3) and drained from the drum (3).

In particular, it is indicated that the upper surface of the granular filter layer (1), in case sand is used as filtering material, will assume an angle of about 30 ° during a slow rotation.

The washing water will thus pass the second pipe (7), to the branch (6), to the filter bag or filter (12), to the filter layer (1) towards its upper surface, to the space (2), to the first branch (4) and to the first pipe (5) and via which the washing water is drained and which is shown in broken lines in Figures 1 and 2.

The diametrically and axially distributed "pipe" shaped pipe sections are, with respect to the embodiment according to Figure 1, both coordinated with a centrally axially oriented pipe section (5: 7) and adapted to have axial branches (6, 11). The central axially oriented pipe portions (5; 7) are sealed from each other by means of a seal or plug (9).

Figures 1 and 2 illustrate the position of the filter bed at rest and during the cleaning process and should illustrate that the volume of filter material is adapted to slightly more than 50% of the volume of the drum.

More specifically, it is pointed out that the parallel axial pipe sections (4, 6) occupy only the order of 30% of the axial length of the drum (3) and thus the expected cleaning process will necessarily concentrate only on the central area of the drum (3), where The utilized mlter material (1) is under efficient agitation and it must therefore be strongly questioned whether the accumulations of the blterbed (1) next to the ends will at all be part of the efficient terlter process.

STATEMENT OF PRESENT TECHNICAL PROBLEMS Considering the fact that the technical considerations that a professional in the relevant technical field must make in order to offer a solution to one or more technical problems are initially a necessary insight into the measures and or the sequence of measures to be taken and a necessary choice of the means or means required, the consequent technical problems should, as a result, be relevant in the creation of the present invention.

Taking into account the prior art, as described above, it should therefore be seen as a technical problem to be able to realize the significance of, the benefits associated with and / or the technical measures and considerations that may be required to: at an initially described arrangement, e.g. to allow particle-contaminated impurities to be filtered off or removed within a particle-laden liquid and thereby to form a particle-free liquid, a filtrate or a permeate, and during use of an filtration unit, to indicate the use of a horizontally arranged rotatable or finally rotatable " 'Container, which shall comprise a well-specified minor proportion of a filtering agent, for receiving a limited amount of free filter particles. 10 15 20 25 30 534 743 There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to reduce the amount of free filter particles through the inner concave shape of the container, but nevertheless offer an opportunity to have an adapted large upper surface spread and a selectable depth formed for the formed blter bed of free ter lter particles.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow free use of metal particles and / or metal oxides, at least in excess, such as AlgOg -particles, and to create conditions for efficient filtration even of small liquid-polluting individual particles, within the particle-laden liquid.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to indicate the use of a "closed" container, adhering to the shape of an elongate hollow cylinder or similar, whose inner circumferential circumferential surface with its associated end portions allows to enclose a cylindrical space intended for filtration and where the container is rotatable and / or rotatable via a horizontally oriented central axis, such as in the form of a tube.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to create the conditions for being able to utilize a limited volume of terlter particles, coordinated within it. ” closed "container", rotatably or rotatably arranged about a horizontal axis of rotation or rotation, and where the actual filtration process is to take place while the container is completely stationary and with a perforated outlet pipe oriented adjacent to the bottom and in the tilting bed of the container and enclosed by a bed for the assigned filter particles There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow an outlet, for a particle-free liquid via the filtration process, to be 10 15 20 25 30 534 743 ll connected to a horizontal pipe, adapted to be able to pass through a front Inclined thin bed over the outlet pipe of the filtering material.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the filtration unit to present such design instructions that it can, via its horizontal container, be easily adapted to a "Dead end" procedure as an alternative to a "Cross fl ow" procedure.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the space of the said container itself to be adapted to support a proportion, preferably more than 10% by volume, such as less than 50% by volume, of said granular or particulate filter material.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow this filter material to be covered by a proportion of the particulate liquid, according to "A" and / or according to "C" above.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the said container to be rotatably or rotatably arranged in a cleaning process and an initial sequence. a horizontally oriented axis of rotation to create the initial sequence of the cleaning process, by mixing the proportion of filter material with the proportion of liquid within the container.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow in a subsequent sequence the material / liquid mixture within the container to e.g. fall freely to the bottom of the container, with the filter particles first.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required in order to have b | .a removed at a final sequence. particles released from the filtering material in the liquid.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said filtering material during the filtration process to be adapted with a large surface area and with a limited depth.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the bottom of the container to be assigned a continuous concave shape, such as a cylindrical shape.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the container with its space to be assigned a long narrow distribution.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow a proportion of particulate liquid to be selected to, at more than 50% by volume of the space total volume, may cover said filtering material.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said container to be placed under an adapted overpressure.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the container to be assigned a hollow cylinder shape with end-related ends enclosing said space.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the container, during the filtration process, to be filled to a proportion of more than 10 15 20 25 30 5311 743 than 15% by volume and up to say 100% by volume, or slightly less than 100% by volume, such as 80-90% by volume, with particulate liquid.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the said container to be stationary in a predetermined predetermined rotational position during a filtration process, e.g. a. depending on the position and dimension of the said atet filtrate or permeate removal tube.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said granular or particulate material to be supplied to the container by means of a valve arrangement and / or a holes in the gable and may be removed by means of a valve arrangement and / or a hole in the gable, such as in the form of an opening with a plug adapted thereto.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said valve arrangements and / or holes to be designed in or related to each of the the two ends of the container.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required in order, as the said filtrate or permeate dispensing tube, for a particle-free liquid, to utilize a perforated outlet pipe, preferably with underlying perforations covered by a screen cloth, in order to prevent an outflow of primarily tilter particles and secondarily particles, related to the particle-laden liquid.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow an fl fate and an overpressure of a particulate fluid to be regulated over an adapted valve arrangement and / or over a pump. 10 15 20 25 30 534 743 There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the container to be rotatably or rotatably arranged about a centered and perforated horizontal axis of rotation, the associated holes of which, in the form of perforations, constitute an elongate and a liquid-distributing inlet to the space for the particle-laden liquid.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said perforation to be directed mainly or exclusively upwards, for a turbulence formation of the particle-laden liquid. In this case, an undesirable "channeling" can be prevented.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the pivot axis associated perforations to be distributed within or substantially within an angular range of 120 °, such as about 90 °.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the perforations associated with the outlet pipe to be directed mainly or exclusively downwards.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the perforations of the outlet pipe to be distributed within an angular range of 120 °, such as 90 °.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the said two sets of perforations to be coordinated into parallel rows. 10 15 20 25 30 534 743 There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the tube, in order to divert particle-free liquid, to be adapted. to pass through the bed of filtering material, in the form of filter particles, and in the filtration process be oriented close to the interior of the container and close to a lower section of the container surface, but be placed slightly above the surface and towards the center of the container, such as a distance of more than 2 mm and usually usually up to 10 mm. For large filter units, however, the distance can be increased slightly, such as to about 15 mm or more.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the particulate liquid to be supplied and distributed within the space exclusively through the horizontal, perforated and perforated axis of rotation. .

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to, in the event of an excessive pressure drop through the filter bed, allow a purification and a purification process of contaminants to be created. particles, i.a. by a rotational movement of the container.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the exact setting position of the container to be stopped when the outlet pipe allows a lowest position, whereby the bed of filter particles are destroyed and filter particles are suspended.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the free filter particles to be gravitationally separated and then to have the filter boat recreated, while previously separating particles, in in the form of sludge, can be removed from the container and when the filter bed is regenerated allowed to reduce the amount of lost par lterpar particles. There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said filter particles to be countercurrently wet, with a pure or purified liquid. . which is fed to the jacket-related outlet pipe at the same time as the bed is gravity-separated.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to use extremely thin and heavy filter particles as a filter bed, to thereby form a membrane-like filter bed, such as with a hard smooth top surface, adapted for efficient particle elicitation, even falling within microdimensions.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow said washing, within a rotating container, to be performed at a rotational speed generating G- forces, such as up to 4 - 6G, such as 2 - 5G.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the filter bed to be thrown out towards the inside of the container, while separating separated particles by means of a "Scale device" or drained.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to use terlter particles as small particles in the form of small particles, for example AlzOa particles, which can form a “hard”, smooth top surface, comparable to unglazed porcelain, which enables a “Cross fl oW process, with an irregular enclosing surface.

There is a technical problem in being able to realize the significance of, the benefits associated with and / or the technical measures and considerations that will be required to allow the grain sizes of the partlter particles, at least to a predominant proportion, to be selected to between 10- 80, such as about 50 x 106m. The present invention is based on the initially indicated prior art, in which an arrangement is adapted to allow particulate contaminants to be removed from a particulate-laden liquid, or alternatively an arrangement for cleaning granules. or particulate filtering material, thereby allowing a particulate-free liquid, a filtrate or permeate to form, using a filtration unit.

Said filtration unit must then at least have an inlet, for the particle-laden liquid, at least have an outlet for the particle-free liquid, and at least an intermediate-oriented filtrating agent, in the form of a selected accumulation of free filtrate particles in agreement with the preamble of claim 1.

In order to be able to solve one or more of the above-mentioned technical problems, the present invention more particularly discloses that the prior art should be supplemented by indicating the features stated in the characterizing part of claim 1.

As proposed embodiments, falling within the scope of the basic idea of the present invention, the peculiarities specified in the subclaims are indicated.

ADVANTAGES The advantages which can mainly be considered to be characteristic of the present invention and the special significant characteristics thus indicated are that in this way conditions have been created for an arrangement, to allow particulate pollutants to be removed from a particle-laden liquid and to contain allowing a particle-free liquid, a filtrate or a permeate to form, using an filtration unit, being able to utilize a limited volume of free filter particles within a "closed" container, rotatably or rotatably arranged about a horizontal axis of rotation or rotation, but where the process itself shall take place while the container is stationary in a certain rotational position.

An outlet, for a particle-free liquid, must then be connected to a pipe, adapted to pass through a bed of filter particles. 10 15 20 25 30 53äl 743 Said container with said space shall be filled to a proportion, of at least more than 10% by volume and preferably less than 50% by volume, with said granular or particulate filter particles and filled to a the remaining part of the particle-laden liquid during the filtration process and rotate the container during the purification process.

The container must be so elongated in a horizontal plane that the älter bed has a large surface area and a short sedimentation distance, with horizontal / vertical wall effects.

The arrangement is adapted for both a "Dead end" procedure and for a "Cross-ow" procedure.

What can primarily be considered to be characteristic of the present invention is stated in the characterizing part of the following claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS A number of presently proposed embodiments, having the significant features associated with the present invention, will now be described in more detail, by way of example, with reference to the accompanying drawings, in which; Figure 1 shows the principle of a "Dead end" process. with a graph of the time course of a filtration, and partly the principle of a "Cross-ow" process, with a graph of a time course of a filtration, Figure 2 schematically shows an arrangement according to the invention, with an inlaid enlarged view of a filter unit, Figure 3 shows in an end view a left end, for a first arrangement according to the invention, for a "Dead end" process, 10 4 20 20 25 30 534 743 Figure 4 shows a left-oriented half of the arrangement in a longitudinal section Figure 5 shows a right-oriented half of the arrangement in a longitudinal section, and Figure 6 shows in an end view a right end, for an arrangement according to the invention, for a "Dead end" process, Figure 7 shows a section "A" - "A" in Figure 4 to illustrate the orientation of the inlet pipe and the outlet pipe, with associated obliquely upwards and obliquely downwards oriented two rows of perforations, and in a filtration process and in a cleaning process, Figure 8 shows in an end view a left-hand view el, for a second arrangement according to the invention, for a “Cross-ow” process and the outlet pipe, Figure 9 shows a left-oriented half of the arrangement in a longitudinal section, with a filling bowl for partlter particles, Figure 10 shows a right-oriented half of the arrangement in a longitudinal section, with an outlet hole for filter particles, Figure 11 shows in an end view a right end for an arrangement according to the invention and for a "Cross" process, Figure 12 shows a section "B" - "B" in Figure 10 to illustrate an outlet pipe for a return fate, serving as a scale device, Figure 13 shows in section and end-related a half-cylindrical container stationary during an filtration process, with a lower filter bed of filter-free free-flow particles and an above-average particle collection. entered dimension indications, 10 15 20 25 30 534 743 20 Figure 14 shows in section the container according to fi guren 13, illustrating different selected filling degrees Figure 15 shows on average the container according to Figure 13 during a rotation and during an initial cleaning process and illustrates different degrees of filling for the utilized bed and the liquid.

DESCRIPTION OF THE PROPOSAL FORM NOW PROPOSED It should then be emphasized at the outset that in the following description, of the presently proposed embodiments, which exhibit the significant features associated with the invention and which are clarified by the teachings herein. choose terms and a special terminology in order to make the idea of invention clear in the first place.

In this context, however, it should be borne in mind that the terms chosen here should not be construed as limiting only the terms used and chosen here, but it should be understood that each term thus chosen should be interpreted so as to include all technical equivalents operating on the same or substantially the same method, in order to be able to achieve the same or substantially the same intention and / or technical effect.

With a reference to the appended figures 1 to 15, not only the background of the present invention is shown schematically and in detail, but also the slangative peculiarities associated with the invention have been concretized, by the now proposed and in more detail described below.

Thus, fi guren 1 illustrates, to the left, the basic principles that can be considered to apply in a particle separation process, which goes by the name “Dead end” process, and an underlying F / t graph of the time-related course of the altering ability, with a over time decreasing ability.

Figure 1 illustrates, to the right, the basic principles that can be considered applicable in a particle separation process, which goes by the name 10 15 20 25 30 534 743 "Cross flow" process, and with an underlying F / t graph of the time-related ability of the filtration ability progression, with a declining ability over time.

The present invention relates to an arrangement which offers an application in the two above-mentioned processes and directs for this purpose the use of a "membrane", assigned the reference numeral "M", the construction of which according to the invention will be further elucidated in the following.

It is only illustrated here that in the "Dead end" process, the particle-laden liquid "A". with particulate impurities 2, may, during the purification process, pass vertically through the membrane "M" to form a filtrate or penneate "B", while in the "Cross-ow" process the particulate liquid "A" should be mainly pass horizontally along the upper surface of the membrane "M" and to some extent only pass vertically through the membrane "M" as a filtrate or perrneat, as illustrated in Figure 1 with directional arrows.

Figure 2 then schematically shows a known particle separation system “S” with a membrane-adapted arrangement or filtration unit 1, however constructed in accordance with the instructions and conditions of the invention.

The system "S", according to Figure 2, indicates an equalization tank "T", to which a continuous (or discontinuous) filling of the particle-laden liquid "A" takes place.

From the tank "T" the liquid "A" is pumped via a pump unit to a filtration unit "F" and from this filtration unit "F" filtrate or permeate "B" is drained and a concentrated proportion, of particles 2 loaded, liquid "C" is returned either to the filter unit "F" or to the tank "T".

From the tank "T" sludge "E", in the form of a liquid and a concentrate of particles 2, can now be drained, preferably in batches.

Figure 2 also illustrates, in a slightly enlarged view, a membrane (M), in the form of an alteration unit "F" or an arrangement 1 according to the invention. 10 15 20 25 30 534 743 Thus, Figure 2 shows the construction principles of an arrangement 1 according to the invention.

Arrangement 1 of the associated type shall then offer an filtration process or a cleaning process, where Figures 2 and 13 illustrate the filtration process itself.

The arrangement 1 is specially shaped to allow particulate contaminants, termed "particles" 2, to be removed from a particle-laden liquid (A) 3 and thereby to form a particle-free liquid (B) 4 while using an filtering agent (M) 5. , b.a. in the form of a "closed" hollow cylindrical container 6.

Said filtering means 5 must have at least one inlet 3a, for the particle-laden liquid 3, at least one outlet 4a, for the particle-free liquid 4, and at least one intermediate-oriented filtering membrane "M", in the form of a filtering means. 5.

Said filtration unit or arrangement 1 shall then have an outer shape adjoining a hollow cylindrical container 6, the circumferential inner outer surface 6a of which allows a space 8 intended for the filtration to be enclosed.

Said space 8 is then adapted to support a granular filter material 9 usable for the actual filtration effect, in the form of tightly coordinated filter particles 9c, which is assigned a density exceeding the density of the liquid 3, and an outlet 4a arranged within the space 8, for the particle-free liquid 4.

Said outlet 4a must then be connected to a horizontal pipe 10, adapted to be allowed to pass horizontally through a bed 9a of the filter material 9 or the filter particles 9c.

The embodiment according to Figure 2 further illustrates that during an filtration process, the container 6 must be stationary and an outlet valve must be open, and an inlet valve must be open.

More specifically, in Figs. 3 to 12, the arrangement 1 proposed here is illustrated.

Figure 4 shows the left-oriented or arranged half of the arrangement 1, in a longitudinally oriented section, while Figure 5 shows the right-oriented or arranged half of the arrangement 1, in a longitudinal section, while Figure 6 shows in an end view a right-hand end 26, for an arrangement 1 according to the invention, adapted for said "Dead end" process.

Figure 7 shows a section “A” - “A” in fi clock 4 to illustrate a centered inlet pipe 18 and a lower outlet pipe 10 with associated obliquely upwards and obliquely downwards oriented two rows of perforations, designated 18a and 19, respectively.

Figure 8 shows in an end view a left end 16 ', for an arrangement 1' according to the invention, for a “Cross-ow” process.

Figure 9 shows the left-oriented or arranged half of the arrangement 1 'in a longitudinal section, while Figure 10 shows the right-arranged half in a longitudinal section.

Figure 11 shows in an end view a right end 26 ', for an arrangement according to the invention, for a "Crossow" process.

Figure 12 shows a section B - B in Figure 10 to illustrate an outlet pipe 7, serving as a scale device.

During an activated washing process and / or when a pressure drop for the liquid 3 inside the filter bed 9a becomes too large, the valves 11 and 13 are closed and the valve 12 is opened, so that a liquid level or upper surface 3a 'can drop to the level of the inlet pipe 3b, after which the valve 12 closes.

The container or drum 6 is rotated about its axis of rotation 6 ', so that the filter boat 9a is suspended, after which the drum 6 is stopped. 10 15 20 25 30 534 743 24 The valve 14 is opened and flushing liquid is supplied countercurrent to the settled filter particles 9c and when the drum 6 is half filled the valve 14 and the partlter particles 9c move downwards and the washing liquid 3 moves upwards at the same time.

When the filter bed 9a, after a few minutes, is regenerated, the valve 12 is opened and a sludge phase is drained.

Thereafter, the valve 12 is closed, after which the valves 11 and 13 are opened and a new filtration sequence and process can continue.

The arrangement 1, according to Figure 2 et seq., Is based on allowing particulate pollutants 2 to be filtered away from a particle-laden liquid 3 in order to form a particle-free liquid 4 while using an filtration unit, having at least one inlet 3a, for the particle-laden liquid 3, and at least one outlet 4a, for the particle-free liquid 4, and at least one filtering agent 5.

Said filtering means 5 has a mold adjoining a container 6, the circumferential inner circumferential surface 6a of which, as far as possible, encloses the space 8 intended for the filtration.

Said space 8 is here adapted to support a granular, utilizing material for the actual filtration effect, in the form of filter particles 9c with irregular outer surfaces, which is assigned a density exceeding a density of the liquid 3.

An outlet 4a, arranged inside the space 8, for particle-free liquid 4, is connected to a pipe 10, adapted to completely pass through and be covered by an alter bed 9a of alter particles 9c at and during the actual alteration process.

According to the basic preconditions of the invention, the container 6, with said space 8, should be filled to a proportion of more than 10% by volume and preferably less than 50% by volume with said barley or particle-formed filter particles 9c and be filled to a proportion of considerably more than 50% by volume with particle load liquid 3. The degree of filling can be up to 100% by volume, but should in practice be 80-90% by volume. In the actual filtration process, the present invention proposes that a thickness "d" of the bed 9a (Figure 13) and / or its upper surface spread 9b should be adapted to the shape and size of the filter particles 9c and / or the contaminated particles 2 and an expected concentration.

The upper surface 9b of the bed 9a should at least cover shaped perforations 19 in the tube 10 and usually completely cover the tube 10, according to figure 13.

The thickness "dl" of the bed 9a (see Figure 13) over the upper surface portion 10a of the tube 10 becomes dependent on the horizontal surface extension 9b which the bed 9a is to have for its particle separation ability.

The stated share of 10% by volume shall, like other percentage conditions, be related to the container's 6 internal total volume.

It must be taken into account that the larger proportion of the filtering material 9 that is selected, the greater filtering capacity is offered at the same time as the total weight becomes larger, however, it can be mentioned that the total weight is of little importance when choosing smaller container diameters.

With regard to the proportion of particulate liquid 3 within the container 6, it must also be related to the internal volume of the container, with a deduction for the selected proportion of the filter material 9 and its filter particles 9c.

The proportion of liquid 3 must in any case be greater than 30% by volume and normally up to and above 50%, with a limit of 100% by volume less the volume of the material 9.

Said granular or particulate material 9 can advantageously be supplied to the container 6 via a valve arrangement and / or a filling inlet and removed from the container 6 via a valve arrangement and / or a drainage outlet.

Said valve arrangement and / or holes can then be formed in each of the two ends 16, 26 of the container 6, 26. As said horizontal, pipe 10 enclosed by the filter bed 9a, a perforated outlet pipe, covered by a screen cloth 17, to prevent an outflow of particles 2 and / or filter particles 9c to the particle-free liquid 4.

The perforations 19 are here directed downwards towards the bottom 6a 'of the container 6 in order to prolong the passage of liquid through the bed 9a.

The liquid flow of the liquid 3 can primarily be regulated over a first valve 11, such as in the form of a 3-way valve or your coordinated 1-way valves. and / or over a second valve 12, such as in the form of a 3-way valve or your coordinated 1-way valves.

The container 6 is rotatably arranged about a perforated shaft 18, the perforations 18a of which form outlets directed upwards, downwards and / or horizontally to the sides of the space 8 completely or partially filled with the particle-laden liquid 3.

These perforations 18a should primarily be directed upwards towards the upper part of the container and the liquid 3, in order to create a turbulence and a vortex formation around a horizontal axis 6 'within the volume of liquid which can be felt over the bed 9a.

For the rotating function of the container 6, bearing means 20, 21 and a driving mechanism 22 are assigned to a stand 23.

The tube 10, which is to pass through the filter bed 9a of filter particles 9c, must be oriented near the lower mantle surface 6a 'of the container 6 during the filtering process and must have perforations 19 and an enclosing filter cloth 17.

The tube 10 is placed over the lower surface section 6a 'of the male surface 6a, a distance "d2" of more than 2 mm, as usually up to 10 mm and / or above depending on the selected diameter of the container 6. 10 15 20 25 30 534' P43 27 prevents the particle-laden liquid 3 from being supplied via an overpressure by means of a pump 24 and is adapted for a continuous flow, at least during the filtration process. The pressure can normally be selected between 2 and 5 kg / cmz.

In the event of an established pressure drop “dP” through the blter bed 9a, a cleaning process is activated via a control unit (not shown) by assigning the container 6 a rotational movement.

The container 6 is stopped when the tube 10 occupies a lowest position, whereby the filter bed 9a is demolished and filter particles 9c are suspended.

The filter particles 9c are gravity separated and recreate the filter bed 9a at the same time as previously separated particles, in the form of sludge, can be removed from the container 6.

Separated filter particles 9c are countercurrently washed with a clean or purified liquid, which is fed to the outlet pipe 10, at the same time as the material bed gravity settlers or separators, since it is an ongoing movement.

Extremely thin, heavy filter particles 9c are used as filter bed 9a, to form a membrane-like filtration bed, adapted for filtering particles 2 even within micro-dimensions.

Said washing within the rotatable container 6, is performed at a selected rotational speed, generating G-forces up to 4-6, such as 2-5G.

The filter bed 9a is thrown out towards the inside 6a of the container 6 while separated particles 2 are emptied, by means of a scale device 7 and an outlet or drained.

In any case, as a predominant part, angular Al2O3 particles 9c were used as the filter bed 9a.

The grain sizes of the particles 9c should predominantly be chosen to be 10-80, such as about 50 x 106m. 10 15 20 25 30 534 'M3 28 It is obvious that the larger your free filter particles 9c selected within the filtered material, the larger and heavier the filter bed 9a becomes, and the more particulate pollutants 2 can accumulate within the bed 9a.

However, it is an object of the invention to keep the filter bed 9a as light as possible, but still offer a heavy arrangement.

It is also obvious that the larger the volume of particulate liquid 3 selected within and over the alter bed 9a, the heavier the container 6 becomes.

In a first proposed embodiment, the volume of the liquid 3, with its contaminating particles 2, is adjusted so that the filter bed 9a can handle its stationary filtration process and / or its subsequent rotary cleaning process.

In a second proposed embodiment, the volume of the liquid 3 is adapted, with its polluting particles 2, where the supply of particle-laden liquid 3 takes place via a shaft 18, the perforations 18a of which constitute scattered outlets to the space 8.

The perforations 18a should, in the second embodiment, during the filtration process be directed upwards, in order to form a well-balanced turbulence within the liquid 3 and to influence the upper layer 9b of the filter bed 9a.

The tube 10 may have its perforations 19 only concentrated and facing downwards. to force the filtered liquid 3 to pass a longer distance within the filter bed 9a.

Figure 13 is intended to illustrate different selected degree of filling for the blter bed 9a and / or for the liquid 3. The thickness of the terlterbed 9a is illustrated here to be able to practically vary between the values "d1" and "d2". will hardly cover the tube 10 and its perforations 19, distributed primarily to the underside. a ”, valid for a hollow cylinder-shaped container 6. On the other hand, a maximum degree of filling is also indicated where the angular value is set to“ ß ”and should in exceptional cases be able to extend to at least up to and perhaps above 180 °.

There is nothing to prevent the degree of filling of the partlter particles 9c from being selected to the value "a" and slightly greater and choosing the degree of filling of the liquid 3 and its surface 3a 'to the value "ß", which may exceed the angular value 180 ° and limit to the value 300 °.

The selected volume for the blterbed 9a and / or the liquid 3 can then advantageously vary between the values selected here: v = L - * / = r2 (ca-sine) Where “L” is the length of the terlterbed 9a (fi gur 4 and fi gur 5); "R" is the inner radius of the container 6 towards its cylindrical inner wall Ga and "G" is the arc dimension of the selected angle, such as "a" and / or "ß".

In a practical application, it has been found appropriate to have the angle "u" for the partlter particles 9c to about 60 ° and the angle "ß" for the liquid 3 to about 240 °, for a selected particle concentration and / or the bead form 2 within the liquid 3.

Finally, the cleaning process illustrates a cleaning process in which the bed 9a and the liquid 3 of the rotation 6 'of the container 6 and generated centrifugal forces are thrown out against the inner cylindrical wall 6a of the container 6.

At a degree of filling for the filter bed Qa (and / or the liquid 3) corresponding to the angular value "d" in the 14 clock 14 a layer of the thickness "t3" is created around the wall 6a and at a degree of filling for the filter bed 9a, corresponding to the angular value "ß" (180 ° or the arc dimension "1r") creates a layer of the thickness "t4" around the wall 6a. It is assumed that the liquid 3 is mixed with the partlter particles 9c. 10 and there forms a purified particle filtering bed 9a.

As a summary it can be mentioned that for an filtration function the space 8 of said container 6 is adapted to support a proportion of more than 10% and less than 50% of said granular or particulate 9c filtering material 9 and a proportion of this material 9 covering a particle amount 2 liquid 3.

For a cleaning process, said container 6 is rotatably or rotatably arranged about a horizontally oriented axis of rotation (6 ') 18 to create an initial sequence for the cleaning process, by mixing the proportion of particle-laden materiallterating material 9 and particles 2 with the proportion of liquid 3.

In a subsequent sequence, the material / liquid mixture is allowed to fall to the bottom of the container 6 in order to have it removed in a final sequence, e.g. in the liquid “C” particles 2 released from the altering material 9 of alter particles 9c.

Said filtering material 9 must have been adapted during the filtration function with a large surface area 9b and with a limited depth "d". The bottom 6a 'of the container 6 is arranged in a concave shape, in order to give the container 6 a long narrow surface extension.

A proportion of particle-laden liquid 3 is chosen to cover the said filtering material 9 to more than 50%, say 80 - 90% of the volume of the space 8.

Said container 6 should be placed under an overpressure of about 2 kg / cm 2 and that the container 6 is associated with a hollow cylinder shape with end-related ends 16, 26 enclosing said space 8.

"Dead end" filtering.

A suitable pump (centrifugal, water ring, diaphragm-piston, etc.) continuously feeds the contaminated liquid 3 into the filter container 6, which is filled to 40% by volume with filter particles 9c. 10 15 20 25 30 534 743 31 The container 6 is filled with liquid 3 which is forced through the blter bed and leaves, as a purified liquid 4 (filrate, permeate) the outlet pipe 10 and the ((capacity) is regulated with outlet valves or equivalent.

The pressure in the container depends on the choice of pump 24, 9lter particles 9c, the back pressure (fl fate). and can normally be at 2 bar or slightly above.

When the pressure in the filter bed 9a rises due to clogging, a washing program is activated, depending on the degree of automation.

Preferably, a buffer tank is installed so as not to have interruptions in fate or two alternators in parallel.

If the feed liquid were to contain gas (air), a gas cushion could possibly be formed in the container 6, which, however, does not impede the filtration (cf. hydrophore).

"Cross-ovW alteration.

As above but the main part of the contaminated liquid 3 is allowed to pass through the filter container 6 via an inlet in the end wall on the inlet side and a back pressure valve to regulate the return flow.

The container 6 is, as indicated above, under pressure and the relationship between the return and filated fl fate is preferably regulated by means of two back pressure valves.

Depending on the type of contaminant (sludge), the bter bed 9a eventually settles and the pressure in the container rises and activates a washing program.

Possible applications: The invention can now be used in the purification of surface water (fl od lake, etc.) with manual operation in developing countries or in disaster situations.

One parent, e.g. a RO- ter lter, offers an opportunity to run the arrangement 1 which can thereby be run longer and save costly membrane constructions at e.g. desalination of seawater. 10 15 20 25 30 534 743 In order to allow the filter bed to be dehydrated during a washing process, very high pressures and large amounts of washing liquid are required, and yet there is a risk of a poor result due to "Channeling" i.e. ductwork in the alter bed.

The invention indicates that the "cross-flow" technology can be used in bed filters.

The hollow cylindrical tubular shape of the container, with a relatively small diameter, offers your advantages over conventional large-diameter filter drums.

Thus, a high strength against high liquid pressure and low manufacturing cost can be expected.

Low leverage at the start of rotation even with large volumes of parlter particles.

Provides a large altering surface at a low cost, as it is mounted horizontally.

The tube shape allows the container to be made relatively long to gain surface area.

The perforated inlet pipe (shaft) means that the liquid is distributed evenly over the alter surface without the risk of “channeling”.

During cross-ow filtration, a high flow rate can be maintained over the filter surface to facilitate the transport of contaminants out of the filter container.

The tube shape provides flexibility in terms of diameter and length and is limited only by the choice of material, thickness in the mantle surface and ends and bearing construction.

The filter shown in the ur gures is approximately 0.5 m long with a diameter of 0.2 m, and with an estimated capacity of approximately 1000 liters per hour.

The invention is of course not limited to the embodiments stated above as examples, but may undergo modifications within the scope of the invention concept illustrated in the appended claims. 534 743 Special consideration should be given to the fact that each displayed unit and / or circuit can be combined with any other displayed unit and / or circuit within the framework in order to be able to achieve the desired technical function.

Claims (26)

10 15 20 25 30 35 534 743 34 ON TEN TKRÅ V Arrangement (1), for filtering off particulate impurities (2) from a particle-laden liquid ((A), 3) and for cleaning a granular and particulate filtering material, for forming a particulate-free liquid therefrom ( (B), 4) using an filtration unit ((M), 5), having at least one inlet (3a), for the particle-laden liquid (3), and at least one outlet (4a) for the particle-free the liquid (4), and in any case an filtering means (5), said filtering means (5) having a form adjoining a "closed" container (6), the circumferential inner surface (6a) of which allows a The space intended for the filtration (8), said space (8) being adapted to support a granular filter material (9) which can be utilized for the actual filtration effect (free filter particles (9c)). which is assigned a density exceeding the density of the liquid (3), and wherein said outlet (4a) is connected to a tube (10), adapted to pass through an alter bed (9a) for the altering material (9, 9c), characterized therefrom , that for an filtration function or effect, the space (8) of said container (6) is adapted to support a proportion of more than 10% by volume and less than 50% by volume of said granular or particulate materialltering material (9) , that for a cleaning process, said container (6) is rotatably or rotatably arranged in a known manner about a horizontally oriented axis of rotation (6 '), in order thereby to create an initial sequence for a cleaning process, by mixing the proportion of particle amount tr filtering material (9, 9c) with the proportion of liquid and in a subsequent sequence allow the material / liquid mixture to fall to the bottom of the container (6), in order to remove in a final sequence e.g. particles released from the liquid from the altering material (9), that the container (6) is rotatably arranged about an axis of rotation (6, 18) serving as a tube (18) adapted to extend between the ends (16, 16) of the container (6). 26) and whose assigned perforations (18a) are adapted to form an outlet to the space (8) for a supplied particle-laden liquid (3), and that an outlet pipe (10) connected to the outlet (4a), adapted to pass through the filter bed (9) of filter material (9c) and is oriented close to the inner shell surface of the container (6) and placed close over the surface section (lower) surface section, such as a distance of more than 2 mm and at least up to 10 mm and that said tube (18) cooperates, on the outside the container (6) and its ends (16, 26) with valves (11, 12; 13, 14) for a control of a selected liquid fl fate. Arrangement according to claim 1, characterized in that said filtering material is, during a filtration function, adapted to offer a large surface area and with a limited depth. Arrangement according to Claim 1 or 2, characterized in that the bottom of the container is assigned a concave shape. Arrangement according to Claim 1, 2 or 3, characterized in that the container is assigned a long, narrow surface extension. Arrangement according to claim 1, characterized in that the proportion of particle-laden liquid is chosen to, to more than 50% by volume of the volume of the space (8), cover said filtering material. Arrangement according to any one of the preceding claims, characterized in that said container (6) is placed under an overpressure. Arrangement according to one of the preceding claims, characterized in that the container (6) is associated with an elongate hollow cylinder shape with end-related ends (16, 26) enclosing said space (8). Arrangement according to claim 1, characterized in that said granular or particulate material (9c) is adapted to be supplied to the inner space (8) of the container (6) via valve arrangement and / or a sealable hole and is removed via a valve arrangement ooh / or a sealable hole. Arrangement according to claim 8, characterized in that said valve arrangement and / or holes are related to each of the ends of the container. Arrangement according to claim 1, characterized in that as the said filter bed continuous pipe (10) a horizontally oriented and perforated outlet pipe, covered by a screen cloth, is used to prevent an outflow of particles and / or partlter particles with the discharged particle-free liquid. Arrangement according to claim 1, characterized in that the flow of the particulate liquid into the container (6) is controllable via a valve arrangement and / or a pump unit. Arrangement according to any one of the preceding claims, in particular claim 1, characterized in that said perforations for the central tube (18) related to the axis of rotation (6 ') are directed upwards. Arrangement according to claim 12, characterized in that the perforations are distributed within an angular range of 120 °, such as about 90 °. Arrangement according to Claim 10, characterized in that perforations associated with the outlet pipe (10) are directed downwards. Arrangement according to claim 14, characterized in that the perforations are distributed within an angular range of 120 °, such as about 90 °. Arrangement according to claim 12 or 14, characterized in that said perforations are coordinated in parallel rows. Arrangement according to Claim 12, characterized in that the particle-laden liquid is supplied to the perforated axis of rotation or the central tube and the container via an adapted overpressure and by means of a pump. Arrangement according to Claim 1, characterized in that in the event of an excessively high pressure drop for the liquid, which passes through the filter bed, a cleaning process takes place, e.g. by assigning a rotation to the container. Arrangement according to claim 1, 7, 9 or 10, characterized in that the rotation of the container is adapted to be stopped when the outlet pipe (10) occupies a lowest position, whereby the filter bed is demolished and filter particles are suspended. 10 15 20 25 30 534 743 37 Arrangement according to Claim 1 or 10, characterized in that filtered particles are subjected to a gravity separation and allow the filter bed to be recreated at the same time as previously separated particles, in the form of sludge, are subjected to a removal from the container. Arrangement according to claim 11, characterized in that separated particles are subjected to a countercurrent wash with a clean or purified liquid, which is adapted to be supplied to the outlet pipe, at the same time as the filter bed is subjected to a gravity separation. Arrangement according to one of the preceding claims, characterized in that extremely thin, heavy and free filter particles (9c) are used as the filter bed, in order to form a membrane-like bed, adapted to create a filtration of particles also with micro-dimensions. Arrangement according to any one of the preceding claims, characterized in that said washing process, in the case of a rotating container, is adapted to be carried out at a rotational speed, generating G-forces, such as up to 4-6G, such as 2-5G. Arrangement according to claim 23, characterized in that the filter bed is adapted to be thrown out towards the inside of the container, while separated particles are during an emptying, such as by means of a scaling device or drained. Arrangement according to Claim 1, characterized in that free filter particles (9c), such as AlzO 2 particles or the like, are used as the filter bed to form a smooth solid bed. Arrangement according to claim 1 or 25, characterized in that the particle grain sizes are, to a predominant proportion, selected to between 10-80, such as about about 10%.