JP2013188721A - Sludge thickener tank, sludge treatment system, and sludge treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat sludge water generated in a water treatment system using a liquid cyclone.SOLUTION: A sludge thickener tank includes a separation tank, a sludge inlet, a concentrated sludge outlet, and a treated water outlet. The separation tank includes a cylindrical body section and a concentration section of a funnel shape connected with the base of the body section, and separate the entered sludge water into concentrated sludge and treated water. The sludge inlet is provided on a side of the body section so that the entering sludge water circles in the separation tank. The concentrated sludge outlet is provided on the bottom of the concentration section, and discharges the concentrated sludge precipitated in the separation tank. The treated water outlet is provided inside or on a top surface of the body section, and discharges the treated water obtained through precipitation of the concentrated sludge.

Description

  The present invention relates to a sludge concentration tank, a sludge treatment system, and a sludge treatment method for treating sludge water generated in a water treatment system using a liquid cyclone.

  Conventionally, as a method of solid-liquid separation for removing suspended substances in water, it is common to perform gravity sedimentation in a sedimentation tank. However, gravity sedimentation using a sedimentation tank requires a long time for processing. Moreover, a large space is required for installing the sedimentation tank.

  On the other hand, in recent years, solid-liquid separation using a liquid cyclone is increasing. When using a liquid cyclone, solid-liquid separation is performed by centrifugal force generated by swirling water to be treated containing suspended solids with a liquid cyclone. By using a liquid cyclone, solid-liquid separation can be realized in a short time and in a small space compared to gravity sedimentation using a sedimentation tank.

JP 2010-214360 A

  However, in the liquid cyclone, when the suspended matter that is a solid content is separated, this suspended matter is pulled out from the outside using the pressure generated by the pump, but in addition to the solid content, a lot of water is also drawn out. . Therefore, since a large amount of sludge water is generated, it is difficult to treat this large amount of sludge water.

  Therefore, the present invention provides a sludge concentration tank, a sludge treatment system, and a sludge treatment method for treating sludge water generated in a water treatment system using a hydrocyclone.

  The sludge concentration tank according to the embodiment includes a separation tank, a sludge inlet, a concentrated sludge outlet, and a treated water outlet. The separation tank has a cylindrical body part and a funnel-shaped concentrating part connected to the bottom of the body part, and separates the influent sludge water into concentrated sludge and treated water. The sludge inlet is provided on the side surface of the body so that the sludge water flowing in the separation tank swirls. The concentrated sludge outlet is provided at the bottom of the concentration unit, and discharges the concentrated sludge that has settled in the separation tank. The treated water outlet is provided inside or on the upper surface of the body portion and discharges treated water obtained by sedimentation of the concentrated sludge.

It is the schematic explaining the water treatment system connected with the sludge concentration tank which concerns on embodiment. It is the schematic explaining the sludge concentration tank which concerns on 1st Embodiment. It is the schematic explaining the relationship between the sedimentation speed of a floc, the outflow of the treated water from the sludge concentration tank of FIG. 2, and the cross-sectional area of a sludge concentration tank. It is the schematic explaining the sludge concentration tank which concerns on 2nd Embodiment. It is the schematic explaining the sludge concentration tank which concerns on 3rd Embodiment.

  Below, the sludge concentration tank concerning each embodiment of the present invention is explained using a drawing. In the following description, the same components are denoted by the same reference numerals and description thereof is omitted.

  The sludge concentration tank which concerns on embodiment of this invention processes the sludge water containing the sludge generated with the water treatment system which processes to-be-processed water using a liquid cyclone. In the liquid cyclone, the water to be treated containing the solid content is swirled inside to separate the solid content and the liquid that is the treated water, but the sludge treated as the solid content contains a lot of moisture. The sludge concentration tank which concerns on each embodiment isolate | separates the sludge water which generate | occur | produces with the liquid cyclone of a water treatment system into a concentrated sludge and a clear treated water.

[First Embodiment]
As shown in FIG. 1, the sludge concentration tank 24 according to the first embodiment is provided in the sludge treatment system 2. Moreover, this sludge treatment system 2 is connected with the water treatment system 1 which processes the to-be-processed water containing solid content, and makes it a clear treated water.

<Water treatment system>
The water treatment system 1 includes a raw water tank 10 for storing supplied water to be treated, a flocculant addition means 11 for adding a flocculant to the water to be treated, and a neutralizer addition for adding a neutralizer to the water to be treated. A means 13; a first flocculating aid adding means 15 and a second flocculating aid adding means 17 for adding a flocculant to the water to be treated; and a plurality of line mixers 12, 14, 16, 18 for stirring the water to be treated; , A floc-forming tank 19 that forms flocs with solids contained in the water to be treated, and a hydrocyclone that flows into the water to be treated and separates into clear water to be treated and sludge water containing solids formed as flocs 20.

  In the raw water tank 10 for storing the water to be treated, for example, a stirrer 101 is provided, and the water to be treated is stirred so that the suspension contained in the water to be treated flowing out becomes a substantially constant amount. The raw water tank 10 is connected to the line L1, and the water to be treated stored in the raw water tank 10 is sent out via the line L1 by the pump P1.

  The flocculant addition means 11 adds a flocculant used to form flocs with suspended substances in the water to be treated flowing through the line L1. For example, the flocculant added by the flocculant adding means 11 is an inorganic flocculant, an inorganic polymer flocculant, an organic polymer flocculant, or the like, and varies depending on the solid content contained in the water to be treated.

  The line mixer 12 is connected to the lines L1 and L2. The line mixer 12 agitates the water to be treated to which the flocculant has been added by the flocculant adding means 11 from the line L1. Moreover, the line mixer 12 sends out the to-be-processed water in which the flocculant was disperse | distributed uniformly via the line L2.

  The neutralizing agent adding means 13 adds a neutralizing agent that adjusts the water quality that allows flocs to easily form in the water to be treated flowing through the line L2. For example, the neutralizing agent added by the neutralizing agent adding means 13 is an acid or an alkali and varies depending on the solid content contained in the water to be treated.

  The line mixer 14 is connected to the lines L2 and L3. The line mixer 14 agitates the water to be treated to which the flocculant has been added by the neutralizing agent addition means 13 from the line L2. Moreover, the line mixer 14 sends out the to-be-processed water in which the neutralizing agent was disperse | distributed uniformly through the line L3.

  The first flocculating aid adding means 15 adds a flocculating aid for greatly strengthening the floc formed by the flocculating agent in the water to be treated flowing through the line L3. For example, the coagulation aid added by the first coagulation aid adding means 15 is an inorganic coagulant, an inorganic polymer coagulant, an organic polymer coagulant, or the like, and varies depending on the solid content contained in the water to be treated.

  The line mixer 16 is connected to the lines L3 and L4. The line mixer 16 agitates the water to be treated, to which the coagulation aid has been added by the first coagulation aid addition means 15, from the line L3. Moreover, the line mixer 16 sends out the to-be-processed water in which the coagulation assistant was uniformly dispersed through the line L4.

  The second flocculating aid adding means 17 adds a flocculating aid for promoting re-aggregation in the water to be treated flowing through the line L4 and making the floc even larger and stronger. For example, the coagulation aid added by the second coagulation aid adding means 17 is an inorganic coagulant, an inorganic polymer coagulant, an organic polymer coagulant, or the like, and varies depending on the solid content contained in the water to be treated. Further, the coagulation aid added to the water to be treated by the second coagulation aid adding means 17 may be the same as or different from the coagulation aid added to the water to be treated by the first coagulation aid adding means 15. It may be.

  The line mixer 18 is connected to the lines L4 and L5. The line mixer 18 infuses the water to be treated, to which the coagulation aid is added by the second coagulation aid addition means 17, from the line L4 and stirs it. Moreover, the line mixer 18 sends out the to-be-processed water in which the coagulation assistant was uniformly dispersed through the line L5. If the floc can be formed sufficiently large and firmly with only the coagulation aid added by the first coagulation aid addition means 15, the second coagulation aid addition means 17 and the line mixer 18 are unnecessary.

  The floc forming tank 19 is connected to the lines L5 and L6, and the floc formed by the solid content contained in the water to be treated flowing in via the line L5 is formed large and firm, and is sent out via the line L6. To do.

  The hydrocyclone 20 is connected to the line L6, and the water to be treated flowing through the line L6 is swirled inside to separate the cyclone-type solid liquid into clear treated water and sludge water containing solids. Separation device. In addition, the hydrocyclone 20 is connected to the lines L7 and L8, and sends the treated water separated via the line L7 and also sends the sludge water separated via the line L8.

  The treated water tank 21 stores treated water flowing in via the line L7, and then sends it to the supply destination of treated water via the pump P2 and the line L9.

  Moreover, the sludge water sent via the line L8 is processed by the sludge treatment system 2.

<Sludge treatment system>
The sludge treatment system 2 includes a third agglomeration aid adding means 22 for adding a flocculant to the sludge water separated by the liquid cyclone 20 of the water treatment system 1, a line mixer 23 for agitating the sludge water, and the first embodiment. The sludge concentration tank 24 which concerns on this is provided. The sludge concentration tank 24 according to the first embodiment separates sludge water into clear treated water and concentrated sludge, as will be described later with reference to FIG. Further, the sludge treatment system 2 includes valves V1 and V2 and a pump P3 as flow rate adjusting means for adjusting the flow of sludge water in the sludge concentration tank 24. Furthermore, the sludge treatment system 2 includes a valve V3 as a means for adjusting backwashing of the sludge concentration tank 24.

  The third flocculating aid adding means 22 adds a flocculating aid for forming a larger and stronger floc with the sludge contained in the sludge water to the sludge water flowing through the line L8. Here, the coagulation aid is added by the third coagulation aid addition means 22 to promote the reaggregation of flocs, thereby dehydrating the concentrated sludge collected by the sludge concentration tank 24 when it is subjected to a treatment such as dehydration. Property is improved, and sludge treatment can be facilitated.

  For example, the coagulation aid added by the third coagulation aid adding means 22 is an inorganic polymer coagulant, an organic polymer coagulant, or the like, and differs depending on the solid content contained in the sludge water. The aggregation assistant added to the water to be treated by the third aggregation assistant addition means 22 may be the same as the aggregation assistant added by the first aggregation assistant addition means 15 or the second aggregation assistant addition means 17. And may be different.

  The line mixer 23 is connected to the lines L8 and L10. The line mixer 23 agitates the sludge water added with the coagulation aid by the third coagulation aid addition means 22 from the line L4. Moreover, the line mixer 23 sends out the sludge water in which the coagulation aid is uniformly dispersed through the line L10.

  Here, in the sludge treatment system 2, in order to adjust the inflow of sludge water into the sludge concentration tank 24, a valve or a pump is not provided on the inflow side of the sludge concentration tank 24, but on the outflow side of the sludge concentration tank 24. A pump P3 and valves V1, V2 are installed as flow rate adjusting means, and the inflow of sludge water is adjusted by the pump P3 and the valves V1, V2. For example, when increasing the inflow amount of sludge water, the valves V1 and V2 are opened, the valve V3 is closed, and the amount of concentrated sludge extracted by the pump P3 is increased.

  This is because when a pump or valve is used before flowing into the sludge concentrating tank 24, the generated floc and the third coagulant aid are added due to pressure fluctuations caused by the flow path area generated by the pump and valve up to the hydrocyclone 20 This is because the flocs greatly strengthened by the coagulation aid added by the means 22 are destroyed, and the pulverized flocs may flow out of the sludge concentration tank 24 together with the treated water.

  In the sludge treatment system 2, the line L13 and the valve V3 are used as backwashing means, and when the discharge port of the sludge concentration tank 24 is closed with concentrated sludge, the valve V3 is opened, the valves V1 and V2 are closed, and the line L12 And backwash water is introduce | transduced into the sludge concentration tank 24 through L13, and the sludge concentration tank 24 is wash | cleaned.

  The sludge concentration tank 24 according to the first embodiment is a cyclone type treatment tank that generates a swirling flow inside the sludge water introduced from the liquid cyclone 20 by using centrifugal force. Here, since the sludge water discharged from the liquid cyclone contains a large amount of water, it is suitable for treatment in a cyclone type treatment tank. Specifically, as shown in the side view of FIG. 2A and the cross-sectional view of FIG. 2B, the sludge concentration tank 24 includes a cylindrical body 31 and a funnel shape connected to the body 31. And a concentrating part 32.

  The body portion 31 has, for example, a cylindrical shape having a height H and a diameter D. A sludge inlet 311 is formed in the vicinity of the lower end of the side surface of the body portion 31. The sludge inlet 311 is connected to the line L10. Sludge water separated by the hydrocyclone 20 flows into the sludge concentration tank 24 through the line L10 and the sludge inlet 311. At this time, the sludge inflow port 311 is formed at a position for turning the sludge water flowing in via the line L10.

  Further, a flange 312 is formed at the upper end portion of the body portion 31, and a flange 313 is formed at the lower end portion. The upper end flange 312 is connected to the closing plate 33 having the treated water outlet 331. That is, the upper opening of the body portion 31 is closed by the closing plate 33. The treated water outlet 331 formed in the blocking plate 33 is connected to a line L11 through which treated water flows out. The flange 313 at the lower end is connected to the flange 322 of the concentration unit 32. Therefore, the lower opening of the body portion 31 is closed by the concentration portion 32.

  The concentration part 32 is formed in the funnel shape of the slope of inclination-angle (theta), for example. A concentrated sludge outlet 321 connected to the line L12 through which the concentrated sludge flows out is provided at the bottom, which is the tip of the concentrated portion 32.

  In the sludge concentration tank 24, the sludge water flowing in via the line L10 is introduced into the tangential method in the tank and turns. At this time, in the sludge concentration tank 24, the sludge inlet 311 is located at a height closer to the center than the upper end of the sludge concentration tank 24. Therefore, in the sludge concentration tank 24, a flow of sludge water going upward and a flow of sludge water going down are generated, and the floc formed by the sludge contained in the sludge water rotates along the inner wall by centrifugal force. To do.

  Specifically, in the peripheral portion of the inner wall of the sludge concentration tank 24, an upward flow is generated up to a position at least as high as the diameter D of the body portion 31 or higher than the diameter D with reference to the height of the sludge inlet 311. . On the other hand, in the region above the height and the inner wall peripheral part, the force that the flock settles outweighs the upward flow. Therefore, in the sludge concentration tank 24, the floc does not reach the sludge inlet 311 and settles along the wall surface of the concentration unit 32 due to the gravity.

  The sludge concentration tank 24 flows the settled sludge to the outside through the concentrated sludge outlet 321 as the concentrated sludge, and flows out the treated water from which the sludge is separated from the sludge water to the outside through the treated water outlet 331. At this time, the concentrating part 32 is configured in a funnel shape, and by setting θ to a value larger than the angle of repose of the sludge, the sludge concentration tank 24 is clogged or flowed due to sludge accumulation that tends to occur near the bottom surface. Turbulence can be prevented, and it can be led to the concentrated sludge outlet 321 by gravity, and the concentrated sludge can be drawn to the outside.

  The sludge flowing out from the concentrated sludge outlet 321 is collected via the line L12 and processed as waste sludge. For example, after further dehydration, it is incinerated.

  The treated water flowing out from the treated water outlet 331 is as clear as the treated water obtained by the hydrocyclone 20 or more. Therefore, the treated water obtained in the sludge concentration tank 24 is sent to the treated water tank 21 via, for example, the line L11 and used together with the treated water obtained in the liquid cyclone 20.

  Here, the sludge concentration tank 24 has been described as being formed by connecting the body portion 31, the concentration portion 32, and the closing plate 33. However, a part or all of these are formed integrally. May be.

Here, as shown in FIG. 5, the amount of sludge water flowing into the sludge concentration tank 24 is set to e [m ³ / hr], and the settling speed of floc contained in the sludge water is set to a [m / hr]. The sedimentation speed a [m / hr] is measured in advance. At this time, the sludge water flowing into the sludge concentrating tank 24 moves up and down, and the floc is concentrated at the outer peripheral portion and gradually settled and separated.

Here, when the outflow amount of the treated water from the treated water outlet 331 is b [m ³ / hr] and the outflow amount of the concentrated sludge from the concentrated sludge outlet 321 is f [m ³ / hr], the treated water Outflow amount b [m ³ / hr] is obtained by b = ef. Further, when the cross-sectional area of the sludge concentration tank 24 is c [m ² ] and the average value of the rising flow velocity in the sludge concentration tank 24 is d [m / hr], the average value d [m / hr] is d = (B / c).

  Therefore, the sludge concentration tank 24 does not always have a constant amount of ascending flow velocity, but the relationship between the average value d [m / hr] of the ascending flow velocity and the floc settling velocity a [m / hr]. By setting the inflow amount and the outflow amount so that d <a, it is possible to prevent the floc from flowing out from the treated water outlet 331 and to treat sludge water. That is, in the sludge treatment system 2, it is necessary to adjust the valves V1 and V2 and the pump P3 so that a <d with respect to the inflow amount e of sludge water from the hydrocyclone.

  In general, in the cyclone type solid-liquid separation tank, it is assumed that a flow rate of about 3 to 50% of the flow rate of the inflowing liquid is drawn out from the downward outlet.

  In the sludge concentration tank 24 which concerns on 1st Embodiment mentioned above, the process of the sludge water discharged | emitted from the hydrocyclone can be implement | achieved easily and in a short time. Moreover, since this sludge concentration tank 24 can be realized with an easy configuration, it is possible to perform sludge treatment on a small scale.

  Furthermore, in the water treatment system using the liquid cyclone, the entire system is obtained by using the liquid cyclone and the sludge concentration tank 24 according to the first embodiment, compared with the water treatment system using gravity sedimentation in the settling tank. As well as the processing time can be shortened.

[Second Embodiment]
Then, the sludge concentration tank 24A which concerns on 2nd Embodiment is demonstrated using FIG. The sludge concentration tank 24A concentrates the sludge water obtained in the liquid cyclone 20 of the water treatment system 1 in the same manner as the sludge concentration tank 24 described above with reference to FIGS.

  The sludge concentration tank 24A shown in FIG. 4 is different from the sludge concentration tank 24 described above with reference to FIG. The rectifying means 314 is formed, for example, at an inclination angle that approximates the inclination of the concentrating unit 32, so as to block the rise of floc contained in the sludge water flowing from the sludge inlet 311 and so that the raised floc falls. Lead.

  In the sludge concentration tank 24A, the flow straightening means 314 prevents the upward flow from being generated near the sludge inlet 311 and prevents the floc from rising. In the sludge concentration tank 24 </ b> A, even if the floc rises up to the body portion 31, the floc turns and moves along the rectifying means 314 to the concentration portion 32 and flows out from the concentrated sludge outlet 321.

  In the sludge concentration tank 24A according to the second embodiment described above, the treatment of the sludge water discharged from the hydrocyclone can be realized in an easy configuration and in a short time. Further, since the sludge concentration tank 24A can be realized with an easy configuration, it is possible to perform sludge treatment on a small scale. Furthermore, the sludge concentration tank 24 </ b> A using the rectifying means 314 can further reduce the concentrated sludge that flows out together with the treated water as compared with the sludge concentration tank 24.

[Third Embodiment]
Next, the sludge concentration tank 24B which concerns on 3rd Embodiment is demonstrated using FIG. The sludge concentration tank 24B concentrates the sludge water obtained in the liquid cyclone 20 of the water treatment system 1 in the same manner as the sludge concentration tank 24 described above with reference to FIGS.

  The sludge concentration tank 24B shown in FIG. 5 differs from the sludge concentration tank 24 described above with reference to FIG. 2 in that the sludge inlet 311 is opened near the upper end of the side surface of the body portion 31. The sludge concentration tank 24B is provided with an opening 331a in the closing plate 33 instead of the treated water outlet 331, and the line L11 passes through the opening 331a and is inserted into the sludge concentration tank 24. It differs in that the end is a sludge outlet 331b. The opening 331a is formed substantially at the center of the closing plate 33, and the sludge outlet 331b exists at a position including the central axis of the cylinder, that is, the central axis of the swirling flow of sludge water.

  Accordingly, the sludge concentration tank 24 has a flow in which sludge water moves upward and a flow in which the sludge water moves downward. In the sludge concentration tank 24B, only the flow in which sludge water moves downward is formed. While rotating, it moves to the side wall of the body portion 31 and flows out along the concentrated portion 32 through the concentrated sludge outlet 321. In this way, the flocs swirl and move outward and downward rather than in the center of the sludge concentration tank 24B, so that they can flow out of the concentrated sludge outlet 321 without reaching the treated water outlet 331b. .

  In the sludge concentration tank 24B which concerns on 3rd Embodiment mentioned above, the process of the sludge water discharged | emitted from the hydrocyclone can be implement | achieved easily and in a short time. Moreover, since this sludge concentration tank 24B can be realized with an easy configuration, it is possible to perform sludge treatment on a small scale. Furthermore, the sludge concentration tank 24B using the slag can efficiently make solid-liquid separation by rectifying the movement of the flock downward as compared with the sludge concentration tank 24.

  As mentioned above, although this invention was described by each embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. Further, the present invention naturally includes various embodiments not described herein.

DESCRIPTION OF SYMBOLS 1 ... Water treatment system 10 ... Raw water tank 101 ... Stirrer 11 ... Aggregating agent addition means 13 ... Neutralizing agent addition means 15 ... 1st aggregation auxiliary agent addition means 17 ... 2nd aggregation coagulant addition means 12, 14, 16, 18 ... Line mixer 19 ... Flock formation tank 20 ... Liquid cyclone 21 ... Treatment water tank 2 ... Sludge treatment system 22 ... Third coagulant additive adding means 23 ... Line mixer 24, 24A, 24B ... Sludge concentration tank 31 ... Body part 311 ... Sludge Inflow ports 312, 313 ... Flange 32 ... Concentration section 321 ... Concentrated sludge outlet 33 ... Blocking plate 331 ... Treated water outlet 331a ... Opening 331b ... Sludge outlet

Claims (10)

A sludge concentration tank for concentrating sludge water containing sludge separated from liquid by a liquid cyclone in a water treatment system for clarifying water to be treated,
A separation body for separating the sludge water that has flowed into concentrated sludge and treated water, having a cylindrical body portion and a funnel-shaped concentration portion connected to the bottom of the body portion;
A sludge inlet provided on a side surface of the body portion so that the sludge water flowing in the separation tank swirls;
A concentrated sludge outlet that is provided at the bottom of the concentration section and discharges the concentrated sludge settled in the separation tank;
A treated water outlet for discharging treated water obtained by sedimentation of concentrated sludge, provided inside or on the upper surface of the body part,
The sludge concentration tank characterized by providing. The sludge inlet is provided at a position closer to the bottom than the upper surface of the body part,
The sludge concentration tank according to claim 1, wherein the treated water outlet is provided on an upper surface of the body part. The sludge inlet is provided at a position closer to the upper surface than the bottom side of the body part,
The sludge concentration tank according to claim 1, wherein the treated water outlet is provided at a position closer to the bottom surface than the upper surface of the body portion and including a central axis of the cylinder.   The sludge concentration tank according to any one of claims 1 to 3, further comprising a rectifying means provided on a side surface of the body part and having an inclination approximate to the inclination of the concentration part. The sludge concentration tank according to any one of claims 1 to 4,
A flocculating aid adding means for adding a flocculating aid to sludge water flowing through a sludge line connected to the sludge inlet;
A sludge treatment system characterized by comprising: The sludge concentration tank according to any one of claims 1 to 4,
Installed on a concentrated sludge line connected to the concentrated sludge outlet, and a flow rate adjusting means for adjusting the amount of concentrated sludge withdrawn from the sludge concentration tank;
A sludge treatment system characterized by comprising:   The sludge treatment system according to claim 6, wherein the flow rate adjusting means is a valve and a pump provided on the concentrated sludge outflow side and a valve provided on the outflow side of the treated water. When the settling speed of floc is a [m / hr], the outflow rate of treated water is b [m ³ / hr], and the cross-sectional area of the sludge concentration tank is c [m ² ], a> (b / c) The sludge treatment system according to claim 6 or 7, wherein the outflow rate of the treated water is determined so as to be. The sludge concentration tank according to any one of claims 1 to 4,
A sludge treatment system comprising backwashing means connected to the concentrated sludge outlet and capable of supplying backwash water. A sludge concentration method for concentrating sludge water containing sludge separated from liquid by a liquid cyclone in a water treatment system for clarifying water to be treated,
Provided on the side of the body part in a separation tank that has a cylindrical body part and a funnel-shaped concentrating part connected to the bottom of the body part, and separates the influent sludge water into concentrated sludge and treated water A step of flowing sludge water from the sludge inlet,
A step in which sludge water swirls in the separation tank;
Discharging the concentrated sludge settled in the separation tank from the concentrated sludge outlet provided at the bottom of the concentration section;
Discharging the treated water obtained by sedimentation of the concentrated sludge from the treated water outlet provided inside or on the upper surface of the body part; and
A method for concentrating sludge.

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