JPH0262282B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an apparatus for clarifying sludge water and other industrial wastewater generated mainly from civil engineering works such as driving-in-place piles, underground wall construction, and muddy water shielding. The purpose of this invention is to provide a compact solid-liquid separation device for sludge water that has an excellent separation function.

``Conventional technology'' Conventionally, there is no suitable device for clarifying sludge water associated with main civil engineering works, and there are methods such as natural sedimentation using a pool method, or dumping into the sea or mountains. had been adopted. This means that the equipment becomes larger and occupies a larger area at the construction site. In addition, there were many problems such as increased cost. Therefore, several types of technical documents can be found here and there regarding these improvements. For example, the special public interest public in 1986-
There is a sludge dewatering equipment No. 46163, and its gist is as follows:
A rotating drum whose periphery is a strainer is installed at a certain level in the retention box, and this rotating drum is equipped with a suction pipe that communicates with a jet pump, and a filter cloth belt is wound around this rotating drum. The filter cloth belt has a structure in which the adsorbed sludge is peeled off and removed on the surface of the filter cloth belt. There is also a solid-liquid separator and device for sludge water disclosed in Japanese Patent Publication No. 61-32078.The gist of the device is to install several mixers with split mixing blades in the middle of the piping, and to install chemical tanks in each of these mixers. A screw conveyor is installed upright in the solid-liquid separation tank connected to the pipe, and a scraping auxiliary blade is provided which contacts the surface of the spiral blade of the screw conveyor and rotates with the rotation of the screw conveyor. The purpose of this system is to actively generate flocs using the mixer, and to reliably discharge the flocs separated in the solid-liquid separation tank using a screw conveyor and auxiliary scraping blades.

There is also a sedimentation separation device of Utility Model Publication No. 57-35366, in which a closed type mixing flocculation tank is placed on top of the main container, which is composed of a hollow cone that can be combined with the main container.
A sludge thickening tank body is provided at the lower part of the body, an umbrella-shaped separator is provided on the upper hollow cone constituting the main body vessel, and an umbrella-shaped separator is provided that slopes along its inner wall, and the lower hollow cone body is a sedimentation separation chamber. The mixing flocculation tank body is further provided with a raw water pipe, and the separation body is provided with a clear water discharge pipe.

Its feature is that the lower part of the main container is a convergent hollow cone, which allows the sludge to flow down. Further, since a cylindrical sludge concentration tank body is provided at the lower part of this hollow cone, it is possible to reliably collect and discharge sludge.

"Problems to be Solved by the Invention" It is clear that the above technical documents serve as a starting point for solving the conventional problems. However, there are quite a few problems. Namely, Special Public Interest Publication in 1986-
The sludge dewatering equipment No. 46163 has mechanical problems that make it difficult to quickly process a large amount of sludge water, and since it uses a filter cloth belt, countermeasures against clogging are required, and cleaning and maintenance are required. There are problems with management, durability, etc. Also, special public service in 1987-
In the solid-liquid separation method and device for sludge water of No. 32078,
A pipe mixer is installed in the piping to mix the sludge water and flocculant, but one pipe mixer cannot achieve sufficient agitation and mixing, so three or four mixers are required as shown in the diagram. In the end, it is necessary to install several units such as the above, and in the end, the apparatus becomes complicated and relatively large, and there are many problems of clogging, and maintenance management is difficult. In addition, solid-liquid separation tanks are effective in actively discharging flocs, but
Separation of clear water and floc using the difference in specific gravity is not always considered to be sufficient. Furthermore, in the invention of Utility Model Publication No. 57-35366, since raw water is introduced into a guideway narrower than the raw water pipe, no flocs can be expected to form in this guideway, and dirty raw water is suddenly introduced into the main container. Therefore, it is unsuitable for efficient solid-liquid separation, especially for separating sludge water, which is the object of the present invention. In addition, a large chamber for sedimentation separation is not formed in the main container, and the long processing time ratio is not distorted.

``Means for Solving the Problems'' Therefore, the present invention is to efficiently and efficiently treat a large amount of sludge water, and to secure water and treated liquid that have been substantially completely sedimented and separated and clarified. Another object of the present invention is to provide a compact solid-liquid separator. The gist is that the raw water inlet pipe is separated from the main body of the container, which has a raw water inlet installed in parallel via a partition plate, and that the raw water is allowed to flow from the raw water inlet pipe to the raw water inlet. A container body consisting of an annular flocculation tank that allows sufficient retention, a cylindrical separation chamber having an upper opening in which the raw water flocculation tank is removably installed, and a large sedimentation separation chamber below; and the raw water aggregation tank are communicated with the raw water inlet, and the separators arranged in an overlapping manner in the cylindrical separation chamber of this container body are arranged so that the inclination length of the separator located above is extremely a plurality of umbrella-shaped separators that are short and have a long inclination length of the separator located below; a plurality of downstream type separation flow channels formed by these separators with different inclination lengths; A supernatant water discharge pipe having an inlet facing the storage part of the lower stage of the separator and a discharge port facing outside the container body that controls the discharge of clear water, and a solid-liquid separation tank of the container body. A sludge discharge port provided at the bottom and a sludge discharge pipe communicating with the sludge discharge port are provided, a large sedimentation separation chamber is formed at the bottom of the solid-liquid separation tank, and a rotatable scraping plate is provided in the sedimentation separation chamber. This is a solid-liquid separation device for raw water such as sludge water, which has a structure in which sludge is accumulated in a depression on the bottom surface.

"Function" Next, to explain the outline of the function of the present invention, raw water such as sludge water introduced into the raw water tank is guided to the reaction tank via piping. A chemical solvent sent from the first chemical tank via piping is added to the raw water that has reached the reaction tank, and at the same time, a stirring blade is rotated to actively convert the water into flocs with good sedimentation properties. The raw water treated in this way is supplied to the agitator via piping, and immediately before entering the agitator, a chemical solvent sent from the second chemical tank via the piping is added to make it even more sedimentable. A good flock is generated. The chemical-added raw water treated with this agitator is introduced into the solid-liquid separation tank from the raw water introduction pipe via piping, and the chemical-added raw water that reaches the flocculation tank is slowly circulated inside the flocculation tank. Here, the main purpose is to further mix the chemical solvent with the raw water and convert it into a floc with good sedimentation properties. The raw water is then introduced to a plurality of separators arranged in at least a double layered manner through the raw water inlet provided in the flocculation tank.
The raw water led to this separator is distributed and flowed down into multiple separation channels, and in the flow process, the raw water comes into contact with the separator and is slowed down by the frictional resistance, and is also subjected to mechanical contact impact. As a result, the flocs grow larger and are separated by the frictional resistance of the separator, thus rapidly solid-liquid separation. Therefore, when the flocs flow into the sedimentation separation chamber, they immediately descend and settle within the chamber, becoming gradually concentrated and reaching the sludge outlet. The sludge is then discharged to the outside via the sludge discharge pipe.
On the other hand, the treated raw water becomes a supernatant liquid and temporarily accumulates in the collection part of the separator, and during this accumulation, it is further separated from the microscopic sludge contained therein, and the beautiful supernatant liquid flows at a very slow rate. The supernatant liquid rises and is discharged to the outside via the supernatant liquid discharge pipe. On the other hand, the sludge is led via piping to a sludge thickening tank where it is pooled, the supernatant water is sent back to the raw water tank via piping, and the settled sludge is sent to a filter press via piping. being transported. The sludge is then separated into sludge mass, clear water, and treatment liquid through a filter press. This sludge mass is discarded, and the treated water and treated liquid are sent back to the raw water tank via piping. Raw water is sequentially treated through such operations.

"Example" The drawing shows an example of the present invention, and first, the solid-liquid separation tank A of the first invention will be described in detail.
is a cylindrical container body consisting of a cylindrical separation chamber 2 and a sedimentation separation chamber 3 with a large volume provided below the cylindrical separation chamber 2;
A doughnut-shaped agglomeration tank 4 having a substantially buoy shape and having a brim-shaped locking arm 5 is installed in a, and in this example, three locking arms are provided in the radial direction from the flocculation tank 4. 5 is the top opening 1a of the container body 1
It is hung on the peripheral wall 1b of. A cylindrical portion 4a is erected in the center of the coagulation tank 4, and a supernatant water discharge pipe, which will be described later, is inserted into this cylindrical portion 4a. Further, reference numeral 4b is a guide cylinder hanging down from the outside of the bottom surface 4b of the coagulation tank 4. A substantially fan-shaped open portion B is formed between the opening 1a and the outer wall of the aggregation tank 4. Further, the coagulation tank 4 is divided into several compartments 8a to 8e via several partition plates 7, and the chemical-added raw water introduced through the through holes 7a provided in each partition plate 7 is It is configured to take a detour from the compartment 8a to the compartment 8e. Although not shown, each partition plate 7 may have upper and lower openings so that so-called chemical-added raw water can flow from the compartment 8a to the compartment 8e in an overflow or underflow manner. Further, as shown in FIG. 3, the inside of the bottom surface 4d of the coagulation tank 4 can be inclined toward the center, and each partition plate 7 can also be provided with an opening 4f for dropping sludge or the like. 9 is a raw water introduction pipe facing the coagulation tank 4. Reference numeral 10 denotes a raw water inlet section provided on the bottom surface 4d of the last compartment 8e of the coagulation tank 4, and this raw water inlet section 9 communicates with the cylindrical separation chamber 2 of the container body 1. Therefore, raw water sufficiently mixed with chemicals flows down into the cylindrical separation chamber 2 through this raw water inlet 10, and is then distributed to a separation flow path composed of a separator to be described later. It's summery. 11 has its substantially upper half inserted into the cylindrical portion 4a of the aggregation tank 4, its substantially lower half reaches the container body 1, and the tip of this lower half reaches approximately the center of the cylindrical separation chamber 2 of the container body 1. The supernatant water discharge pipe
An inlet 10a of the supernatant water discharge pipe 11 opens into a storage section of a lower separator, which will be described later, and an outlet 11b thereof opens to the outside of the container body 1. Then, in the part of the supernatant water discharge pipe 11 that is vertically installed in the cylindrical separation chamber 2, umbrella-shaped first and second separation bodies 12 and 13 that expand downward are superimposed in a double form. Specifically, the first separator 12 located above has an extremely short slope length, and the second separator 13 located below has a long slope length.
These are irregular separators 12 and 13.

Therefore, after raw water with a relatively large amount of sludge is first treated in the first separator 12, this treated water is
It flows down to the second separator 13 and is processed again.
The second separator 13 has a rational separation structure in which raw water that has been somewhat treated flows down through a narrow guide tube 4b. The outer inclined surface 12a of the first separator 12 and the inner inclined surface 113b of the second separator 13
Separation channels 14 and 15 are formed between the two and on the surface of the second separator 13. As a result, the raw water flowing down from the raw water inlet 10 of the aggregation tank 4 flows down the outer peripheral surface of the supernatant water discharge pipe 11 and is distributed to the separation channels 14 and 15, respectively.
In the figure, reference numeral 16 denotes a guide tube that protrudes like a truss from the central housing part of the second separator 13, and this guide tube 16 is provided with a raw water inlet 16a. Reference numeral 17 denotes a rotating shaft penetrating through the center of the container body 1;
A motor 18 is provided at the upper end of the holder 7, and a support rod 20 for mounting a scraper plate 19 is provided at the lower end. This scraping plate 19 is provided with an appropriate inclination angle as shown in the figure, and is configured to reliably move the sludge deposited on the inner bottom surface 1a of the container body 1 toward its center. ing. 21 in the figure is a sludge discharge port, and this sludge discharge port 21 is connected to a sludge discharge pipe 22. 24 is an oil drain gutter, 24a is a through hole formed between the oil drain gutter 24 and the container body 1, and 25 is a frame.

Next, an example of the use of the solid-liquid separator of the present invention will be explained with reference to the schematic diagram in FIG. (hereinafter referred to simply as piping)
The pump 3 is connected to the reaction tank 32 via the
3, raw water is fed to the reaction tank 32 via the piping 31. Then the reaction tank 32
The tank is connected to a first chemical tank 35 via piping 34, and a chemical solvent such as a coagulant is added to the raw water fed to the reaction tank 32 to convert the sludge contained in the raw water into a sedimentary state. Convert it into a good flock. This reaction tank 32 is connected to a stirrer 38 via a pipe 37 equipped with a pump 36, and a pipe 40 is connected to the pipe 37 connected to the stirrer 38. The chemical solvent in the second chemical tank 39 is fed to the stirrer 38 through the piping 40, and the raw water to be treated and the chemical solvent are stirred and mixed within the stirrer 38.
This stirrer 38 is then communicated via a pipe 41 to the solid-liquid separation tank A, which has already been described in detail, and is separated into supernatant water and sludge in this solid-liquid separation tank A. The supernatant water is discharged through the supernatant water discharge pipe 11 of the solid-liquid separation tank A, while the sludge is discharged from the sludge discharge pipe 22.
The sludge thickening tank 4
4. The supernatant water separated in this sludge thickening tank 44 is returned to the raw water tank 30 via piping 45.
The sludge is conveyed back to the filter press 47 via a line 46 equipped with a pump 50. The clarified water and treated liquid compressed and separated by the filter press 47 are sent back to the raw water tank 30 via a pipe 48, and the sludge mass is deposited on a truck 49.

Next, the operation of the present invention will be explained based on the illustrated example. Raw water such as sludge water introduced into the raw water tank 30 is guided to the reaction tank 32 via the piping 31. A chemical solvent such as a polymer flocculant sent from the first chemical tank 35 through the pipe 34 is added to the raw water that has reached the reaction tank 32, and at the same time, stirring blades are rotated to actively settle the water. It transforms it into a sexy flock. Specifically, the particle size of SS is converted into μ or mm units. The raw water treated in this way is supplied to the agitator 38 via the pipe 37, and
Immediately before entering this agitator 38, a chemical solvent such as SIFLOCK (trade name) supplied from a second chemical tank 39 via piping 40 is added, and the treated raw water and chemical solvent are sufficiently mixed in this agitator 38. Stirring and mixing produces a floc with better settling properties.
The chemical-added raw water treated with this agitator 38 is
Solid-liquid separation tank A from raw water introduction pipe 9 via pipe 41
The raw water introduced into the flocculation tank 4 slowly circulates from the empty compartments 8a of the flocculation tank 4 toward the compartment 8e by repeating detours, overflows, and underflows, and further flows through the flocculation tank 4. By further mixing with the chemical solvent introduced in step 4, it is converted into a floc with good sedimentation properties. A plurality of first and second separators 12 and 13 are arranged in a superimposed manner through the raw water inlet 8 provided in the flocculation tank 4.
be led to. These first and second separation bodies 12, 13
The raw water led to the is distributed and flowed down into the plurality of separation channels 14 and 15, and in the flowing process, the raw water flows down the outer inclined surfaces 12 of the first and second separators 12 and 13.
a, 13a, the flocs are made to move more slowly due to the frictional resistance, and the flocs grow larger due to the mechanical contact impact, and are separated due to the frictional resistance of the first and second separators 12, 13. Solid-liquid separation is thus carried out rapidly. After flowing through the separation channels 14 and 15, the supernatant water and floc flow down the annular gap formed by the inclined separation chamber 2 and the separator 13, and the supernatant water flows into the sedimentation separation chamber 3. As it reaches the upper part of the container body 1, the flocs flow down into the sedimentation separation chamber 3 and are gradually concentrated, and the sludge is transferred to the center of the inner bottom surface 1a of the container body 1 by the scraper plate 19. , and reaches the sludge discharge pipe 22 via the sludge discharge port 21.
On the other hand, the treated raw water becomes supernatant water and temporarily accumulates in the upper part of the sedimentation separation chamber 3 and inside the umbrella part of the first separator 12, and at the time of this accumulation, it is further separated from the minute sludge contained therein. The clean supernatant water rises at a slow speed and is discharged to the outside via the supernatant water discharge pipe 11. Furthermore, the sludge that reaches the sludge discharge pipe 22 is led to a sludge thickening tank 44 via a pipe 42 and pooled there, and the supernatant water is sent back to the raw water tank 30 via a pipe 45 and recycled. used. Further, the settled sludge is transferred to a filter press 47 via a pipe 46. The sludge is then separated into a sludge mass, treated water, and treated liquid through a filter press 47. This sludge mass is discarded, and the treated water and treated liquid are sent back to the raw water tank 30 via piping 48 and reused. Raw water is sequentially treated through such operations.

"Effects of the Invention" Since the present invention has the configuration detailed above,
It has the following effects.

The present invention provides a raw water aggregation tank separated from the container body at the top opening of the container body, and this aggregation tank secures the flow of raw water from the raw water inlet pipe to the raw water inlet. The flocculation tank and the container body are configured to communicate with each other through a raw water inlet.

Therefore, the raw water is sufficiently mixed with the flocculation aid in this flocculation tank, has the effect of assisting the formation of flocs, and has the effect of uniformly distributing the raw water to the plurality of flowing separators. This allows for natural flow and gradual natural flow.

The umbrella-shaped double type separator of the present invention has an irregular structure in which the first separator located above has an extremely short slope length, and the second separator located below has a long slope length. It is a separate body of

Therefore, after raw water with a relatively large amount of sludge is first treated in the first separator, this treated water is
Flowing down to the second separator and being reprocessed. The second separator has a rational separation structure in which raw water that has been treated to some extent flows down through a narrow guide tube.

Furthermore, since the present invention has a structure in which the raw water coagulation tank is detachably attached to the upper opening of the container body, it is possible to easily deal with contamination caused by adhesion of sludge to the separator, and the container body and the separator The body is easy to clean and maintenance management is easy.

Furthermore, in the present invention, since the sedimentation chamber provided in the container body has a large volume, a chamber useful for sedimentation separation is formed.
In addition, it is expected that even the smallest sludge can be sufficiently captured and agglomerated, resulting in improved separation efficiency. Furthermore, it is useful for shortening the processing time.

Please note that we have submitted the experimental data table for the present invention as a reference material as attached.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a solid-liquid separation tank, FIG. 2 is a partially cutaway plan view, and FIG. 3 is a sectional view showing another example of a coagulation tank. FIG. 4 is a schematic diagram showing an example of use of the present invention. DESCRIPTION OF SYMBOLS 1... Container body, 2... Cylindrical separation chamber, 3... Sedimentation separation chamber, 4... Coagulation tank, 4a... Cylindrical part, 4b... Guide tube, 5... Locking arm, 7... Partition plate, 8a-8e... Compartment chamber, 9... Raw water introduction pipe, 10... Raw water inlet, 11...
Supernatant water discharge pipe, 12, 13...Separator, 14, 15
... Separation channel, 16... Guide tube, 17... Rotating shaft, 18
... Motor, 19... Scraping plate, 20... Support rod, 22...
Sludge discharge pipe, 24...oil discharge gutter, 25...frame, 30...raw water tank, 33, 36, 43, 50...
Pump, 32... Reaction tank, 35... First chemical tank, 38
... Stirrer, 39... Second chemical tank, 44... Sludge concentration tank, 47... Filter press, 49... Cart.

Claims (1)

[Claims] 1. The raw water inlet pipe is separated from the container main body, which has a raw water inlet section installed in parallel via a partition plate, and by ensuring the flow of raw water from the raw water inlet pipe to the raw water inlet part, sufficient retention of raw water can be achieved. A container body consisting of an annular flocculation tank that allows the raw water to flow, a cylindrical separation chamber with an upper opening in which the raw water flocculation tank is removably installed, and a large sedimentation separation chamber below, and the container body and the raw water A plurality of umbrella-shaped separators having sloped surfaces with different sloped lengths are arranged in a cylindrical separation chamber of the container body in a superimposed manner and communicated with the aggregation tank through the raw water inlet; A plurality of downstream type separation channels formed by the body, an inlet facing the receiving part of the lower separator of the separator, and an outlet facing the outside of the container body which controls the discharge of clear water. A large sedimentation separation chamber is provided at the bottom of the solid-liquid separation tank. A solid-liquid separation device for raw water such as sludge water, which has a sedimentation separation chamber provided with a rotatable scraper plate.