JPH02293007A - Method and device for solid-liquid separation - Google Patents

Abstract

PURPOSE:To flocculate fine particles in the sludge contg. the fine particles to form large flocs by bringing the mixing injection liquid contg. the fine particles into contact with the sludge solution contg. the fine particles having lower surface potential in a mixing tube. CONSTITUTION:This device consists of a dispersion chamber 2 for dispersing the fine particle contg. sludge solution 1 and the solid-liquid separation chamber 3 for separating fine particles and supernatant liquid from sludge solution 1. One or plural mixing tubes 4 one end of which is opened in the dispersion chamber 2 and the other end of which is opened in the separation chamber 3 are provided between both chambers so as to penetrate the wall 12 of the separation camber 2. One or plural injection pipes 5 injecting injection liquid into the mixing pipes 4 are provided. One or plural injection liquid supply pipe 11 supplying injection liquid into the injection tubes 5 are provided. When the fine particles and the supernatant liquid are separated from the fine partice contg. sludge solution, the mixing liquid added the fine particles in advance is used as the injection liquid. As a result, the fine particles in the fine particle contg. sludge solution are flocculated into large flocs.

Description

[Detailed description of the invention] [Field of industrial application] This invention is applicable to industrial wastewater, human waste, sewage, biologically treated water thereof, brewing waste liquid, brewing liquid, dredging liquid, dredging bottom mud, etc. This invention relates to a solid-liquid separation device and a solid-liquid separation method for flocculating and separating fine particles [microorganisms, algae, plankton, etc.] from a dredged liquid.

[Conventional technology] High-concentration treatment of activated sludge that prevents deterioration of treated water quality due to bulking in biological treatment of contaminated wastewater, improves treated water quality, reduces excess sludge, and improves treatment capacity. It was impossible to continue operating the law.

For culture solutions and fermentation solutions that do not require the addition of flocculants, high-grade separators that require enormous equipment costs are used to separate microorganisms. In addition, vast areas of dredged sludge,
Conventional sedimentation tanks have too low performance to remove fine particles and phytoplankton from lakes and seawater, and no countermeasures have been taken.

Problems to be Solved by the Invention] The problems of the conventional technology can be solved by improving the solid-liquid separation performance for fine particles. This problem has been solved by the following invention.

This invention [1986 Patent Application No. 158519, No. 17]
No. 2471, No. 278095, 1988 Patent Application No. 1
No. 10926, Patent Application No. 1556 of 1988 claiming priority
No. 24, Patent Application No. 180749 filed in 1988, and Patent Application No. 176579 filed in 1988 claiming priority area]. However, at the interface where the two liquids come into contact, there is a difference in electrolyte concentration between the injected liquid-washed fine particles and the unwashed fine particles, resulting in a difference in surface potential, resulting in attraction and collision. '. When the liquid discharged from the injection tube flows through the mixing tube in a laminar flow, the thickness of the interface becomes thinner, suppressing the occurrence of vortices and disturbances, and improving solid-liquid separation performance. In order to obtain a laminar flow, the length of the injection tube and the mixing tube must be increased, and o. It is necessary to install a porous material with continuous micropores of oos to 3 Ils in the injection tube.

The longer the pipe, the larger the equipment. When the porous material is installed, there are installation and maintenance costs for the SS removal facility in the injection solution and the iron removal equipment to prevent clogging by iron bacteria that proliferate in the porous material by using Fe from the injection solution1. It had the disadvantage of being bulky.

[Means for Solving the Problem] The solid-liquid separation method according to claim 8 includes adding separated fine particles to an injection liquid having a large difference in electrolyte concentration from the fine particle-containing sludge liquid (for example, the electrolyte concentration is low). Because the surface potential of the fine particles in the mixed injection solution increases instantly,
This mixed injection liquid containing fine particles is placed in a mixing tube,
By bringing it into contact with a fine particle-containing sludge liquid containing fine particles with a low surface potential, the fine particles in the fine particle-containing sludge liquid are aggregated to form a giant floc.

The solid-liquid separator according to claim 1 is characterized in that the fine particles added to the mixed injection liquid in the mixing tube differ from the electrolyte concentration of the fine particle-containing sludge liquid, so that the surface potential caused by the electrolyte concentration in the fine particle-containing sludge liquid Since the particles come into contact with fine particles having different values, suction aggregation is likely to occur between the two fine particle groups. When a conventional injection liquid contacts a sludge containing fine particles, in order to obtain fine particles with a different surface potential value from the fine particles in the sludge containing fine particles that are in contact with the injection liquid, the fine particles in the sludge containing fine particles must be The absolute condition is to create cleaned and unwashed fine particles at the interface in contact with the injection solution (fine particles with different surface potentials can be obtained). For that purpose, 2
It is necessary to form a continuous interface of a thin film of 0.1 to several tens of microns between two particles. Therefore, disturbance of the interface and generation of vortices are not allowed at all. To obtain such a laminar flow, the length of the mixing tube should be 100 times the diameter, or
The injection tube had to be fitted with a porous material forming a fine particle size of 0.005 to 31II1.

The method of the present invention obtains fine particles that have a large difference in surface potential from the electrolyte of the fine particle-containing sludge liquid by simply adding fine particles in advance to the injection liquid that has a large concentration difference with the electrolyte of the fine particle-containing sludge liquid. be able to.

The injection solution containing these fine particles is called a mixed injection solution. The fine particle-containing sludge liquid and the mixed injection liquid are mixed in the mixing pipe at a rate of 0.1~
Since giant flocs are obtained even when mixing at an interface of several thousand microns, the length of the mixed injection liquid supply pipe, the length of the injection pipe for injecting into the mixing pipe, and the length of the mixing pipe can be shortened. Since the interface may be in contact with a thick film, the flow rate between the injection tube and the mixing tube can be increased several times or more.

Furthermore, since it is only necessary to attach a layer of perforated plates having a diameter of 0.3 mm or more to the injection pipe, a portion of the biologically treated water containing a large amount of SS can be recycled.

The solid-liquid separation method according to claim 8 is an invention of a method for separating fine particle-containing mixed sludge into fine particles and supernatant liquid using the solid-liquid separator according to claim 1, , the flow rate of the mixed liquid (mixed sludge containing fine particles and injection liquid) in the mixing pipe is set to 1.
0<Re<sx 10', and the flow rate of the mixed injection liquid in the injection pipe is maintained at 5<Re<5X10', and both liquids are brought into contact with each other in the mixing pipe to almost complete the coagulation effect.

The fine particles added to the injection liquid of the present invention and the fine particle-containing sludge liquid treated by the solid-liquid separator are culture growth liquid,
Brewing waste liquid, dredging sludge [algae (diatoms, blue-green algae, green algae, flagella
) including microorganisms and their dead bodies, other organic matter, and inorganic matter], plant blanks generated due to eutrophication 1.
actinomycetes, which are the source of musty odors,
Lake water and seawater containing red tide flagella, settled sludge from fish farms, industrial wastewater (including livestock waste) and its biologically treated water, domestic wastewater and its biologically treated water, human waste and its biologically treated water, and/or It also refers to SS of sewage, its biologically treated water, and all of the above liquids.

The injection liquid can be biological treatment supernatant, physicochemical treatment supernatant, low concentration contaminated industrial wastewater, seawater, tap water, distilled water, irrigation water and/or industrial water (lake water, river water, groundwater, etc.). It will be done. Furthermore, as the injection solution, an aqueous solution containing a flocculant, such as a metal flocculant (aluminum salt, iron salt, activated silicic acid, magnesium salt, calcium salt) aqueous solution, an alkali metal salt aqueous solution, or a polymer flocculant aqueous solution can also be used. .

The solid-liquid separation chamber of the present invention refers to a chamber for sedimentation separation and concentration in which flocculated flocs are sedimented and concentrated, and a chamber for flotation separation and concentration in which flocculated flocs are concentrated.

The present invention will be explained below based on the accompanying drawings.

FIG. 1 shows a solid-liquid separator of the present invention. In the solid-liquid separator, a dispersion chamber 2) is provided in a liquid supply chamber to which the fine particle-containing sludge liquid 1) is supplied. One or more mixing tubes 5) (two are shown in FIG. 1) are provided in the dispersion chamber, and one end of the mixing tube 4) with both ends open is provided in the dispersion chamber to serve as a supply port 13) for the fine particle-containing sludge liquid. , the other end is a mixing pipe discharge port +5) for directly discharging the aggregates into the solid-liquid separation chamber 3), and a plurality of mixed injection liquid supply pipes 11) and 5) for supplying a mixed injection liquid 6) containing fine particles are provided. Provided in the injection pipe 5) (see Figure 3) Il
Connect the injection tube to several mixing tubes, each with their central axes joined together.
FIG. 3 is a diagram of a device provided with books. The injection pipe discharge port 14) opens toward the downstream side of the mixing pipe. A wall between the dispersion chamber and the solid-liquid separation chamber! 2) is provided to control the flow of the mixed injection liquid 6) supplied from the injection tube outlet and the flow of the mixed injection liquid 6) from the annular portion 17) to the single tube 18).
(See Figure 3) flows in contact with the flow of the sludge containing fine particles 1), and at the interface, violent collisions occur between the fine particles of the sludge containing fine particles and the fine particles of the mixed injection liquid. It is repeated to form huge flocs while passing through the mixing tube. The fine particle-containing sludge liquid supply ports of a plurality of mixing pipes are maintained at the same water level to equalize the amount of water flowing into each mixing pipe. The number of mixing pipes is such that the total amount of the mixed liquid 7) of the fine particle-containing sludge liquid m and the amount of injection liquid is such that the flow rate passing through each mixing pipe is 10<
It is decided to keep Re<sx 10'. The flow rate of the injection liquid in the injection tube is also maintained at 5<Re<5XlO'.

Figure 2 shows the buoyant solid-liquid separation chamber 3), which is used as a solid-liquid separation chamber when buoyant phytoplankton is treated as dredged sludge.
use. Arrangement of mixed injection liquid supply pipe 11), mixing pipe 4) and injection pipe 5) equipped with perforated plate 16), inside the mixing pipe,
The flow rate in the injection tube is in the same range as in FIG. In order to separate giant flocs from the mixed liquid 7) discharged from the mixing pipe, the mixed liquid supplied to the floating solid-liquid separation chamber is passed through the connecting pipe 22.
) and supplied to the outer cylinder of the solid-liquid separation chamber. The giant flocs are concentrated while swirling and floated, and are discharged from the top of the solid-liquid separation chamber as dredged sludge (1G), and the supernatant liquid 8) is discharged from the central cylinder at the bottom of the floating solid-liquid separation chamber and becomes dredged liquid. Spread into the area of collection.

FIG. 3 is a diagram in which the central axis 19) of the tube bundle of the plurality of mixed injection liquid supply tubes 11) is merged with the central axis 20) of the injection tube and the central axis 21) of the mixing tube.

FIG. 4 is a diagram in which the central axes of one mixed injection liquid supply pipe 11), one injection pipe 5), and one mixing pipe 4) are completely united.

It is a diagram in which a perforated plate 16) is attached to the injection tube.

Figure 5: One mixed injection liquid supply pipe equipped with a perforated plate 11)
This is a diagram in which the central axes of the injection pipe 5) and the mixing pipe 4) are completely aligned.

When a plurality of mixed injection liquid supply tube central axes 19) and injection tube central axes 20) are combined, two points, the injection tube inlet and the injection tube outlet, are aligned perpendicular to the central axis of the injection tube. 2 peace and
Two circles drawn at 0.2 times the inner diameter of the injection tube, with the two intersections with the extension line of the central axis of the plurality of mixed injection liquid supply tube bundles centered on the two intersections of the injection tube center axis and two planes, respectively. Refers to what is inside. When the center axis of the mixed injection liquid supply tube and the center axis of the injection tube coincide with the intersections of the two planes perpendicular to the center axis of the injection tube mentioned above (hereinafter referred to as complete union), the length of the injection tube can be determined. It can be made shorter.

When loading the perforated plate 16) into the injection pipe 5), it is better to place it upstream of the injection pipe outlet at a distance of at least one time the diameter of the injection pipe, as this will increase the rectification effect and improve the flocculation performance. It has a big impact on improvement.

If an appropriate perforated plate is provided at the right position, it is not necessary to unite the central axis 19) of the mixed injection liquid supply pipe with the central axis 20) of the injection pipe, and the amount of mixed injection liquid can be reduced and the length of the injection pipe can be adjusted. The pipe length can be shortened. Furthermore, if a perforated plate is used in the injection tube, giant flocs will form even if the flow velocity in the mixing tube is increased to Re=5XlO'. When not using a perforated plate, the length of the injection tube should be 80 to 100 times the diameter.Re = 1.5X
It is impossible to exceed io3. The perforated plate is made of antibacterial ceramic plate, synthetic resin plate, and metal plate, and has a thickness of 0.1.
A porous plate with a hole diameter of 3 to 8 mm, and a combination of these materials alone or in layers can be used. The perforated plate has an average velocity in the tap water pipe of 5×10−'+I/
It is desirable to keep the pressure loss in sec within 0.3 to 1000+u+. If the pressure loss is 0.3 sm or less, the rectification effect is small, and if it is 1000 ms or more, the required power is large and it is uneconomical.

The pipe diameter of the mixed injection liquid supply pipe 11) is 0.3 to 300 mm.
shall be. If it is thinner than 0.3++n, the added fine particles will clog.

If it is thicker than 300, the length of the injection pipe is 50 to 10 times the diameter of the injection pipe.
Since the length of a single mixing tube requires 5 to 50 times the diameter of the mixing tube (the tube is rectangular: equivalent diameter), the solid-liquid separator becomes huge and uneconomical. Pipe diameter is 20Illtl
When exceeding this amount, the length of the injection tube and mixing tube can be shortened by attaching a perforated plate. The method of supplying the injection liquid from multiple mixed injection liquid supply pipes is the method of supplying the mixed injection liquid through a perforated plate (see Figure 5), or the method of bundling a large number of mixed injection liquid supply pipes and supplying from each shell. (See Figure 3). In a plurality of mixing injection pipes, the pipe length may be shorter as the hole diameter and pipe diameter to which the perforated plate is attached are smaller and the flow velocity of each hole diameter and pipe diameter is equal. The hole diameter of the perforated plate is 0.3m with a diameter of 0.3 to 8 mm.
If it is less than m, the SS will be easily clogged, and if it is more than 8aIll, many perforated plates will be stacked in layers. It is preferable that the tubes of the plurality of mixed injection liquid supply tubes each having a diameter of 0.61 to 20 am are bundled and attached to the injection tube. In general, in a mixed injection liquid supply pipe that is not equipped with a perforated plate, the pipe length is Re = 150.
0, it is required to be 60 to 70 times the diameter.

The longer the length of the injection tube, the less it will be affected by the floc-forming ability, the water quality of the injection liquid, the shape of the tube, and the injection method. The length of the pipe is from the mixed liquid supply port or from the injection liquid supply port of the perforated plate attached to the injection pipe to the injection pipe discharge port. The length of the tube is preferably 5 to 100 times the diameter of the injection tube (the tube is square: equivalent diameter).
Double is better. Flock formation is not possible below 5 times. Even if the diameter of the injection tube is 100 times or more, there is no problem in aggregation, but the solid-liquid separator becomes huge and is not economical.

If the flow rate in the mixing tube is Re>5XIOl1, no flocs will be formed. If R e < sx io',
Flock forms. If IQ>Re, the throughput per mixing tube will be small and the processing cost will be high. The formed flocs have a flow velocity in the mixing tube of 10'<R e <
Even if it becomes 5X 10' and is destroyed once,
If R e < 5X 10' is maintained, flocs will be formed. The discharge speed of the injection liquid into or from the injection tube is R
If e>5XIQ', no flocs will be formed.

If Re<5XlO' is maintained, floc growth is promoted. If Re<5, the amount of injection tubes to be processed per tube will be small and the processing cost will be high.

The amount of mixed injection liquid is 200% or less, preferably ao-i%, based on the fine particle-containing sludge liquid. If it is less than 15, the flocculating effect is low, and even if it is more than 200%, the floc-forming ability remains unchanged. If it exceeds 200%, the load on the solid-liquid separation chamber will be too large, and the effect of increasing the amount of injected liquid will not be recognized.

The solid-liquid separation performance is improved because the fine particles in the fine particle-containing sludge liquid come into contact with the fine particles added to the mixed injection liquid with different electrolyte concentrations, Since there is a difference in electrolyte concentration between the two fine particles, the resulting drop in repulsive potential energy causes intense aggregation between the fine particles, and the mixing and aggregation is repeated, forming a huge floc toward the downstream of the mixing tube. do.

This is due to the fact that sludge has been newly given a strong flocculating property other than the flocculating property of sludge. Therefore, even bulking sludge will form huge flocs.

Generally, when the difference in electrolyte (ion) concentration between the two solutions is large,
The bonding force between aggregated fine particles and floc particles seems to be strong. Desirably, when the electrolyte concentration difference between the mixed injection liquid and the fine particle-containing sludge liquid is lag/1 or more, flocs are easily formed, and when it is IOmg/I or more, the floc-forming ability is strong. Although flocs can be formed with 2x 10'ng/1 or more, the drug cost increases and is not economical. When the mixed sludge liquid containing fine particles is seawater, if a polyvalent metal salt is used as the injection liquid, the concentration of the polyvalent metal salt is 1/10 of that of an alkali metal salt.
Since the same aggregation effect can be achieved at ~1/200, the amount can be kept below 2x 1O'sg/1.

The amount of fine particles added to the mixed injection liquid is 1 to 200% of the microorganisms m in the fine particle-containing sludge liquid. Preferably 3-1
It is 00%. If it is less than 1%, the flocculation ability will be low, and if it is more than 200%, the flocculation facility, the mixing facility for added fine particles, and the solid-liquid separation device will be large. Generally, fine particles of the same quality that have been aggregated and separated are used in circulation, but if fine particles of different types are used, a device that can handle changes in the electrolyte concentration of the mixed injection solution is required.

Example-1 Sedimentation tank diameter 0.505m. Volume 0.4m3 (0.2a''
The final aeration tank of an activated sludge facility where pulp and paper wastewater is biologically treated was supplied to a test sedimentation tank in a test machine with a diameter of 2m. The activated sludge concentration MLSS4050mg/I, settling tank supply sludge ffi2m'/day, return sludge concentration SS8
SS of the sedimentation tank effluent was 12.5 mg/1 when the system was operated at 000 mg/l, return sludge ffilm+'/day, and water area load of 10 m3/■8 days. Solid-liquid separator in the same test sedimentation tank! ! [Injection tube (40mmX 1000m
Attach a porous propylene non-woven fabric (thickness 10!Il1 and 1080g/13 to 45mm) to the mixing tube (diameter 60 volume - single tube length 600 ■ annular length 1000).
Solid-liquid separation chamber (diameter 0.2s x 1.8m
) in the conventional method. The solid-liquid separation chamber of the conventional method is equipped with a perforated plate on the injection tube of the present invention. Separation device [injection tube (
Inject a perforated plate (2 mm thick stainless steel plate with 52 holes with a diameter of 0.811!L and 9 holes with a hole diameter of 3 m in a layered structure with a spacing of 4 mm) into a stainless steel plate (2 mm thick). It is installed upstream 1 at 800+is from the pipe outlet, and connects the center axis of the injection pipe and the mixing pipe (diameter 60ma, single pipe length 6).
00a+m annular length 1000mm)] In the solid-liquid separation chamber of the conventional method, multiple mixed injection liquid supply pipes (inner diameter 3am, outer diameter 4mm pipes 37) are bundled and each Insert the discharge port (opening in a plane perpendicular to the tube bundle axis),
B0 conventional method in which the center axis of the injection tube and the center axis of the tube bundle of multiple mixed injection supply tubes are aligned, and the tube bundle outlet of the mixed injection liquid supply tube is installed at a position 800*m upstream from the injection tube outlet. Operating conditions of test machines A and B: Activated sludge (MLSS4 1 20ffig/1) supplied to the solid-liquid separation tank, 6Il
13 days, return sludge (MLSS15100a+g/1)
1.64 m'/day, injection liquid is tap water (i), discharge water (Na
A mixture of 40% tap water (220 ppm) and 60% tap water (3) was used, and a mixture of effluent water (220 ppm Na) with Ca-lopp@ was used. The SS of the discharged water and the sludge interface in the sedimentation tank are supplied to the solid-liquid separator, and the time required for the interface to drop and become twice as concentrated after stopping the extraction from the sedimentation tank, the porous plate of the injection pipe, and the porous material. The pressure loss after flowing through the clog for 6 hours is shown in Table 1.

Table 1 AB Conventional effluent SS (A) mg/l 1.8 2.5
1.8 (mouth) 〃3.8 6J 2.
6 (c) ” 1.6 2.2 1.
9 Time required for concentration (a) minutes 46 62
48 (mouth) 〃61 105 57 (
C') 〃44 56 48 Pressure loss
(a) mm 0 0 0 (
口)"008 (c) 〃 O O Defective: Fluid cannot be passed for more than 3 hours due to flocs.

A mixture of treated water and divalent metal salt can be used as the injection solution.

Example 2 Algal blooms in a brackish water canal were floated. Patent Application No. 62-18
A solid-liquid separation device of the same type as the solid-liquid separation tank shown in Figure 3 of Patent Application No. 0749 and Priority Patent Application No. 63-176579 was used. For the mixing tube, the injection tube, and the perforated plate attached to the injection tube of the solid-liquid separation device, those in Example 1 were used. The injection liquid was treated water of the present invention (COD18.7mg/1.SSIJs+g
/1, Cll36+ag/1) 0.5, and a mixed solution with a ratio of 1 river water was used.

River water (COD5.2mg/1, SS4.7mg/I,
CI 16 mg/1) was pretreated with IIIllI Noscreen. Water contaminated with blue-green algae was treated at 15 m''/day and 1.5 m of injected liquid for 37 days.Since the particle diameter of blue-green algae is 50 times larger than that of bacteria, the amount supplied to the mixing tube was greater than the amount supplied to the mixing tube where bacteria do not form flocs. At most, large flocs are formed.In the case of blue-green algae, the air bubbles produced by photosynthesis in the summer are trapped within the flocs when they form, and the flocs have a large buoyant force, so they easily float up and separate.

In the test, in order to confirm whether the mixed liquid of river water and the treated water of the solid-liquid separator of the present invention is clogged by SS, the injection liquid was started to be supplied to the perforated plate, and then the feed liquid f
It was determined whether the pressure loss occurred until i300 m3.

Table-2 Blue-green algae contaminated water injection treatment liquid pressure loss supply ・Supply amount Supply ffi SS layer 3/day m3/day mg/i ms1
5' 1.5 113 No pressure loss was observed for 020 days.

[Effects of the Invention] The flocculation device of the present invention can reduce the fine particles in the sludge containing fine particles by simply adding fine particles of the sludge containing fine particles to the injection liquid, which has a large electrolyte concentration difference from the electrolyte concentration in the sludge containing fine particles. Fine particles having different surface potential values can be easily obtained in a mixed injection solution.

When the mixed injection liquid containing the fine particles and the sludge liquid containing the fine particles are brought into contact with each other in a mixing pipe at Re<sx 10', the fine particles form flocs. The processing capacity per mixing tube has been increased several times.

In the present invention, a perforated plate (hole diameter of 0.3 mm or more) is installed in the injection tube, or a plurality of mixed injection liquid supply tubes (a hole diameter of 0.3 mm or more) is installed in the injection tube.
．． Installation of a perforated plate with a hole diameter of 3 mm or more, or 0.3
Since it is possible to install a tube bundle of mixed injection liquid supply tubes of +am or more, clogging with SS and iron bacteria is eliminated.
It is no longer necessary to install iron removal equipment or SS removal equipment, making maintenance management easier. River water and industrial water can now be used.

Additionally, it is now possible to add electrolytes to SS treated water from aged organisms and reuse it as an injection solution, opening the door for use in facilities with limited water resources.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the solid-liquid separator of the present invention. FIG. 2 is a sectional view of the solid-liquid separation device (floatable solid-liquid separation chamber) of the present invention. FIG. 3 is a sectional view where the tube bundle center axis, the injection tube center axis, and the mixing tube center axis of the mixed injection liquid supply pipe of the present invention are merged. FIG. 4 is a sectional view in which the central axis of the mixed injection liquid supply tube of the present invention, the central axis of the injection tube equipped with the perforated plate, and the central axis of the mixing tube are completely united. FIG. 5 is a cross-sectional view in which the central axis of the mixed injection liquid supply tube, the central axis of the injection tube, and the central axis of the mixing tube are completely united, each of which is equipped with the perforated plate of the present invention. l. Sludge liquid containing fine particles 2. Dispersion room 3. Solid-liquid separation port4. Mixing tube 5. Injection tube 6. Mixed injection liquid 7. Mixed liquid8. Supernatant liquid 9. ! Shrunken sludge 10. Floatable thickened sludge11. Mixed injection liquid supply pipe 12. Wall 13. Fine particles. Sludge liquid supply port containing children 14. Injection tube outlet 15. Mixing pipe outlet 16. Perforated plate 17. Annular part 18. Single pipe part zq. ii Joint injection liquid supply pipe center axis 21. Mixing tube center axis 22. connecting pipe

Claims (1)

[Scope of Claims] 1) Consisting of a dispersion chamber 2) for dispersing the sludge liquid 1) containing fine particles and a solid-liquid separation chamber 3) for separating the fine particles and the supernatant liquid; One or more mixing tubes 4) with one end opening into the dispersion chamber and the other end opening into the solid-liquid separation chamber are connected to the wall 1 of the dispersion chamber.
2), and one or more mixed injection liquid supply pipes 11 supplying the mixed injection liquid 6) to which fine particles have been added.
) is provided in the injection pipe 5), and one or more injection pipes are provided in the mixing pipe. . 2) The solid-liquid separator according to claim 1, further comprising one or several mixed injection liquid supply pipes 11) for supplying the mixed injection liquid 6) to the injection pipe 5). 3) The solid-liquid separation device according to claim 1, wherein the central axes of the plurality of mixed injection liquid supply pipes 11) and injection pipes 5) are unified. 4) The solid-liquid separator according to claim 1, wherein the injection pipe 5) is equipped with one or more perforated plates 16). 5) One or more perforated plates 16) in the mixed injection liquid supply pipe
2. The solid-liquid separator according to claim 1, wherein the solid-liquid separator has a structure in which: 6) The solid-liquid separator according to claim 2, wherein the mixed injection liquid supply pipe has an inner diameter of 0.3 to 300 mm. 7) The solid-liquid separator according to claim 1, wherein the length of the injection tube is 5 to 100 times the inner diameter of the injection tube. 8) Using the solid-liquid separator according to claim 1, the mixed injection liquid to which fine particles have been added is brought into contact with the fine particle-containing sludge liquid in a mixing tube to separate the fine particles and the supernatant liquid 8). In this case, the flow of the mixed liquid in the mixing tube is 10<Re<5×10
^5, The flow of the mixed injection liquid inside the injection tube is 5<Re<5×1
A solid-liquid separation method for separating fine particles from a fine particle-containing sludge liquid, characterized by maintaining the fine particles in a range of 0^4. 9) The amount of mixed injection liquid is 1 to 200 of the amount of fine particle-containing sludge liquid.
The solid-liquid separation method according to claim 8, wherein the solid-liquid separation method is expressed as %. 10) The difference between the electrolyte concentration in the mixed injection solution and the electrolyte concentration in the fine particle-containing sludge solution is 1 mg/l or 2 x 10^5.
9. The solid-liquid separation method according to claim 8, wherein the solid-liquid separation method is in the range of mg/l. 11) The amount of fine particles added to the mixed injection liquid is 1 to 200% of the amount of fine particles in the fine particle-containing sludge liquid.
The solid-liquid separation method described in section. 12) The solid-liquid separation method according to claim 8, wherein the electrolyte concentration in the mixed injection liquid is lower than the electrolyte concentration in the fine particle-containing sludge liquid. 13) The solid-liquid separation method according to claim 8, wherein the electrolyte concentration in the mixed injection liquid is higher than the electrolyte concentration in the fine particle-containing sludge liquid. 14) In the dispersion chamber 2) for dispersing the sludge liquid containing fine particles,
One or more mixing tubes 4) are provided with one end opening into the dispersion chamber and the other end penetrating the wall 12) of the dispersion chamber and opening to the outside, and the mixed injection liquid 6) is placed in the mixing tube. Fine particles and supernatant liquid from fine particle-containing sludge liquid characterized by having a structure in which one or more injection pipes 5) are provided for injection, and one or more mixed injection liquid supply pipes 11) are provided in the injection pipes. A member for a solid-liquid separator that separates into solid and liquid separators.