Sewage treatment tank using integrated sedimentation tank

Abstract

The invention relates to a sewage treatment tank using integrated sedimentation tanks, which comprises an anaerobic tank and an aerobic tank which are communicated with each other, an aeration device is arranged at the bottom of the aerobic tank, the sewage treatment tank also comprises at least two integrated sedimentation tanks, and the integrated sedimentation tanks are sequentially arranged in the aerobic tank along the length direction of the aerobic tank. Each integrated sedimentation tank comprises a sedimentation tank body, a water passing hole communicated with the aerobic tank is formed in the side wall of the sedimentation tank body, inclined tube filler is arranged in the sedimentation tank body, a water outlet groove extending in the width direction of the aerobic tank is formed in the upper side of the inclined tube filler, and a sludge falling opening spaced from the bottom of the aerobic tank is formed in the bottom of the sedimentation tank body. According to the sewage treatment device provided by the invention, the integrated sedimentation tank is arranged in the aerobic tank, so that the occupied space of the sewage treatment tank is reduced.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a sewage treatment tank using an integrated sedimentation tank. Background Art

[0003] In sewage treatment, traditional AO (anaerobic-aerobic) and AAO (anaerobic-anoxic-aerobic) processes are the biochemical system denitrification and phosphorus removal processes with the simplest process flow and the most widely used. Existing sewage treatment equipment using the AAO process, such as the treatment tank disclosed in the "Integrated sewage treatment tank and sewage treatment method for improved AAO" disclosed in Chinese patent CN104891656B, includes an anaerobic phosphorus removal zone, a low oxygen aeration zone, an enhanced aeration zone and a sedimentation zone, which are adjacent to each other and arranged in one piece and separated by partition walls; water flow channels are respectively provided on each partition wall; the anaerobic phosphorus removal zone is divided into a first anaerobic phosphorus removal zone and a second anaerobic phosphorus removal zone by a first partition wall, and water flow channels are respectively provided at both ends of the first partition wall. A channel is provided, and a plug flow stirring device is provided at the wastewater inlet end in the first anaerobic phosphorus removal zone and the end of the second anaerobic phosphorus removal zone away from the wastewater inlet end; the low oxygen aeration zone is divided into a first low oxygen aeration zone and a second low oxygen aeration zone by a second partition wall, and water flow channels are provided at both ends of the second partition wall, and an air plug flow zone is provided at the water inlet end of the first low oxygen aeration zone; the sedimentation zone and the anaerobic phosphorus removal zone are connected through a sludge return channel; an air plug flow device is provided in the air plug flow zone; the air plug flow zone and the first low oxygen aeration zone are separated by a partition wall.

[0004] The first low oxygen aeration zone and the second low oxygen aeration zone are located in the anaerobic zone, and the enhanced aeration zone is located in the aerobic zone. In the anaerobic zone, the sewage uses microorganisms to absorb and degrade COD, ammonia nitrogen, TN and TP, and nitrification is carried out at the same time. The reaction and denitrification reaction can effectively remove some of the difficult-to-degrade organic matter and improve the removal efficiency of organic matter. In the sample area, it can increase the absorption of phosphorus by microorganisms and improve the removal efficiency of phosphorus. The mixed liquid treated in the aerobic area enters the sedimentation area for mud and water separation. Part of the separated sludge flows back to the anaerobic area and the aerobic area, and part is recycled. The returned sludge is used to adjust the sludge concentration in the corresponding pool, which can effectively reintroduce the ammonia nitrogen in the sludge into the biological reaction to increase the removal efficiency of suspended solids and organic matter.

[0005] The problem with the existing sewage treatment device is that the sedimentation zone is set outside the aerobic zone, so the sedimentation zone itself will occupy a large land space. For many old sewage treatment plants, land is very scarce and the size of new tanks is greatly limited. Summary of the invention

[0006] The object of the present invention is to provide a sewage treatment device which places an integrated sedimentation tank in an aerobic tank so as to reduce the space occupied by the sewage treatment tank.

[0007] In order to solve the above technical problems, a technical solution of a sewage treatment pool in the present invention is as follows: A sewage treatment tank using an integrated sedimentation tank comprises an anaerobic tank and an aerobic tank which are connected to each other, an aeration device is arranged at the bottom of the aerobic tank, the sewage treatment tank further comprises at least two integrated sedimentation tanks, each integrated sedimentation tank is sequentially arranged in the aerobic tank along the length direction of the aerobic tank, each integrated sedimentation tank comprises a sedimentation tank body, a water through hole connected to the aerobic tank is arranged on the side wall of the sedimentation tank body, an inclined tube filler is arranged in the sedimentation tank body, a water outlet trough extending along the width direction of the aerobic tank is arranged on the upper side of the inclined tube filler, and a mud outlet arranged at a distance from the bottom of the aerobic tank is arranged at the bottom of the sedimentation tank body.

[0008] Furthermore, the length direction of the aerobic pool is the front-to-back direction, and the width direction is the left-to-right direction. The length of the integrated sedimentation tank is extended along the left-to-right direction, and the width is extended along the front-to-back direction.

[0009] Furthermore, a sludge hopper which is larger at the top and smaller at the bottom is provided on the lower side of the inclined tube filler on the sedimentation tank body. The bottom of the sludge hopper is a sludge settling port. A distributor with an inverted V-shaped structure is provided on the lower side of the sludge settling port. There are two sludge drop ports, which are formed between the front side of the distributor and the front side wall of the sedimentation tank body and between the rear side of the distributor and the rear side wall of the sedimentation tank body. The two sludge drop ports are respectively located on the front and rear sides of the sludge settling port.

[0010] Furthermore, the width of the mud outlet gradually narrows from top to bottom.

[0011] Furthermore, each mud outlet is provided with an air release port on the upper side, and the air release ports are distributed on the front and rear sides of the mud depositing port.

[0012] Furthermore, the left side wall of the integrated sedimentation tank constitutes a guide wall, a water retaining plate is arranged on the left side of the guide wall, a water hole is arranged on the guide wall, and a water distribution channel is formed between the water retaining plate and the guide wall, the upper end of which is connected to the aerobic tank and the lower end is connected to the water hole.

[0013] Furthermore, the length of each water outlet trough is extended in the left-right direction, and the water outlet troughs of each integrated sedimentation tank are connected to the same water outlet pipe.

[0014] The beneficial effects of the present invention are as follows: in the present invention, at least two integrated sedimentation tanks are sequentially arranged in the aerobic tank along the length direction of the aerobic tank, which does not increase the space of the aerobic tank, and thus can reduce the floor area of ​​the sewage treatment tank; the clean water produced in the sedimentation tank (the clean water layer on the upper side of the inclined tube filler) is discharged through the outlet trough, and the sludge produced in the sedimentation tank enters the aerobic tank through the sludge outlet, thereby eliminating the corresponding reflux equipment and reducing the energy consumption of sludge reflux. According to different treatment scales, a suitable number of integrated sedimentation tanks can be selected and arranged in the aerobic tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 This is a usage state diagram of Example 1 of a sewage treatment tank in the present invention; Figure 2 yes Figure 1 Schematic diagram of the distribution of the integrated sedimentation tanks in the aerobic tank; Figure 3 yes Figure 1 A top view of the integrated sedimentation tank; Figure 4 yes Figure 3 1-1 sectional view; Figure 5 yes Figure 3 2-2 sectional view; Figure 6 It is a schematic structural diagram of an integrated sedimentation tank in Example 2 of a sewage treatment tank in the present invention; Figure 7 yes Figure 6 Schematic diagram of the coordination between the middle mud discharge auger and the mud discharge trough; Figure 8 yes Figure 6 A in the enlarged view; Fig. 9 yes Figure 6 The enlarged view of point B in the figure; 1. Anaerobic tank; 2. Aerobic tank; 3. Integrated sedimentation tank; 4. Outlet trough; 5. Outlet pipe; 6. Aeration device; 7. Bubbles generated by the aeration device; 8. Sedimentation tank body; 9. Inclined tube filler; 10. Sludge hopper; 11. Mud drop hopper; 12. Mud settling port; 13. Mud drop port; 14. Air release port; 15. Liquid level line; 16. Diversion wall; 17. Water distribution channel; 18. Clear water layer; 19. Front side wall of sedimentation tank; 20. Back side wall of sedimentation tank; 21. Distributor; 22. Movable wall; 23. Fixed wall; 24. Bubble guide plate; 25. Mud discharge port; 26. Mud discharge door; 27. Gear; 28. Mud discharge auger; 29. ​​Mud discharge space; 30. Auger shell; 31. Spiral conveying blade; 32. Shell sludge inlet; 33. Auger motor; 34. Auger shaft; 35. Mud discharge trough; 36. Mud discharge pipeline; 37. Length adjustment cylinder; 38. Flip adjustment cylinder; 39. The first part of the movable wall; 40. The second part of the movable wall; 41. Connecting rod; 42. Connecting rod avoidance long hole; 43. Water outlet; 44. Front side plate of distributor; 45. Rear side plate of distributor. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0017] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] Embodiment 1 of a sewage treatment tank in the present invention is as follows Figures 1 to 5 As shown: It includes an anaerobic tank 1 and an aerobic tank 2 arranged on the left and right, and four integrated sedimentation tanks 3 are arranged in sequence along the front-to-back direction in the aerobic tank 2. The integrated sedimentation tank 3 includes a sedimentation tank body 8, and the upper end of the sedimentation tank body 8 is supported and fixed on the edge of the aerobic tank. The bottom of the aerobic tank is provided with an aeration device 6. The length direction of the anaerobic tank and the length direction of the aerobic tank are both extended along the front-to-back direction.

[0019] The structures of the integrated sedimentation tanks are the same. The length of the sedimentation tank body is extended in the left-right direction, and the width of the sedimentation tank body is extended in the front-back direction.

[0020] The sedimentation tank body 8 of the integrated sedimentation tank is used to be placed in the aerobic tank when in use. The left side wall of the sedimentation tank body constitutes a guide wall 16. A water retaining plate is arranged on the left side of the guide wall 16. A water distribution channel 17 is formed between the water retaining plate and the guide wall. A water outlet 43 is arranged on the guide wall 16. The lower end of the water distribution channel is connected with the water outlet, and the upper end of the water distribution channel is a water inlet of the water distribution channel connected with the aerobic tank.

[0021] An inclined tube filler 9 is provided inside the sedimentation tank body. An outlet trough 4 for discharging clean water from the sedimentation tank body is provided on the upper side of the inclined tube filler. The length of the outlet trough extends along the left and right directions. The outlet troughs of each integrated sedimentation tank are connected to the same outlet pipe 5. Item 18 in the figure represents the clean water layer, and item 15 represents the liquid level line of the clean water layer. Clean water can flow to the outlet pipe through the outlet trough.

[0022] A sludge hopper 10 with a larger top and a smaller bottom is arranged on the sedimentation tank body at the lower side of the inclined tube filler. The bottoms of the front and rear side walls of the sludge hopper are close to each other. The bottom of the sludge hopper is a sludge settling port 12. The sludge in the sludge hopper is concentrated under the action of sedimentation due to the action of the front and rear side walls of the sludge hopper.

[0023] A distributor 21 of an inverted V-shaped structure is arranged in the sedimentation tank body at the lower side of the sludge hopper 10. The distributor 1 comprises a front side plate 44 and a rear side plate 45 of the distributor. The front side plate and the rear side plate of the distributor form an inverted V-shaped structure. A mud outlet 13 communicating with the aerobic tank is formed between the front side plate of the distributor and the front side wall of the sedimentation tank body. A mud outlet 13 communicating with the aerobic tank is formed between the rear side plate of the distributor and the rear side wall of the sedimentation tank body. The two mud outlets are respectively located at the front and rear sides of the mud outlet, and the width of each mud outlet gradually narrows from top to bottom. A gas release port is provided on the upper side of each mud outlet, and the gas release ports are distributed on the front and rear sides of the mud outlet. In the present embodiment, each gas release port is respectively located directly above the corresponding mud outlet, the front gas release port is located between the front side wall of the sludge hopper and the front side wall of the sedimentation tank body, and the rear gas release port is located between the rear side wall of the sludge hopper and the rear side wall of the sedimentation tank body.

[0024] The design surface load of the integrated sedimentation tank is 1.2~3.5m³ / ㎡.h.

[0025] The inclined tube filler has a designed inclination angle of 60° and a vertical height of 0.866~1.5m.

[0026] The outlet trough is set along the length of the integrated sedimentation tank to evenly collect clean water.

[0027] The length-to-width ratio of the integrated sedimentation tank must be 1:2~1:4. The water distribution channel is set on the shorter side of the sedimentation tank. The flow velocity of the water hole at the bottom of the diversion wall must be ≤0.3m / s. Low flow velocity increases water distribution uniformity.

[0028] The inclination angles of the front and rear side walls of the sludge hopper are set to 45°~60°. The sludge settling outlet below the sludge hopper must ensure a flow rate of ≤0.1m / s, and the sludge settling outlet is a full-length outlet set along the length of the sedimentation tank.

[0029] Each side wall of the distributor is tilted on one side with a tilt angle of 45°~60°. It is necessary to ensure that the bottom of each side wall of the distributor exceeds the width of the mud settling port by ≥30cm to prevent bubbles from rising to the mud settling port and stirring the mud bucket area.

[0030] In the present invention, the sewage first enters the anaerobic tank and then enters the aerobic tank, also known as the aeration tank. According to the needs, a suitable number of integrated sedimentation tanks are placed in the aerobic tank to achieve sludge sedimentation, which can not only reduce the space occupied by the entire sewage treatment tank, but also allow the sludge to directly settle in the aerobic tank, thereby reducing the sludge return energy consumption. According to different treatment scales, multiple sets of integrated sedimentation tanks can be connected in parallel, which is suitable for small-scale and large-scale sewage treatment facilities. The sludge on the lower side of the inclined tube filler is first precipitated through the sludge hopper, and is concentrated and gathered under the guidance of the front and rear side walls of the sludge hopper, and then is divided to the respective corresponding mud outlets through the distributor, and is concentrated and gathered again at each mud outlet. The two-stage sedimentation improves the sedimentation efficiency. The gravity of the finally concentrated and concentrated sludge is greater than the buoyancy of the bubbles generated by the aeration device, so the sludge can fall into the aerobic tank through the mud outlet, and the bubbles entering through the mud outlet are discharged through the gas release port. The gas release port can reduce the disturbance of the bubbles to the mud outlet, thereby ensuring that the sludge is smoothly gathered and concentrated in the sludge hopper.

[0031] Embodiment 2 of a sewage treatment tank Figures 6 to 9 As shown: In Example 1, the sludge produced by the integrated sedimentation tank will be continuously discharged into the aerobic tank, which may cause the sludge in the aerobic tank to be too much. To solve this problem, in this embodiment, The front side wall of the sludge hopper is a movable wall 22 whose upper end is hingedly connected to the sedimentation tank body. The hinge axis of the movable wall 22 is extended in the left-right direction. A movable wall driving mechanism for driving the movable wall to swing around its hinge axis is arranged between the front side wall of the sedimentation tank and the movable wall. The movable wall driving mechanism is a flip adjustment cylinder 38. One end of the flip adjustment cylinder is hingedly connected to the front side wall of the sedimentation tank, and the other end of the flip adjustment cylinder is hingedly connected to the movable wall. When the piston rod of the flip adjustment cylinder is extended, the movable wall flips backward. In this embodiment, the movable wall is a telescopic movable wall with adjustable length. The movable wall includes a first movable wall part 39 and a second movable wall part 40 that cooperates with the first movable wall part to guide movement. The upper end of the first movable wall part is hingedly connected to the sedimentation tank body, and the flip adjustment cylinder is hingedly connected to the first movable wall part. A length adjustment cylinder 37 for driving the second movable wall part to extend and retract relative to the first movable wall part is arranged between the first movable wall part and the second movable wall part. The extension and retraction direction of the piston rod of the length adjustment cylinder is the same as the moving direction of the second movable wall part. The piston rod of the length adjustment cylinder is connected to the second movable wall part through a connecting rod 41. A connecting rod avoidance long hole 42 for avoiding the connecting rod is arranged at the lower end of the first movable wall part. When the piston rod of the length adjustment cylinder is extended, the second movable wall part can be extended from the first movable wall part, thereby increasing the length of the entire movable wall.

[0032] The rear side wall of the sludge hopper is a fixed wall 23 whose upper end is fixedly connected to the rear side wall of the sedimentation tank body. A mud discharge port 25 extending in the left and right directions is provided on the fixed wall 23. A mud discharge door 26 that can be opened and closed is provided at the mud discharge port 25. Specifically, the mud discharge door 26 is guided and moved and assembled on the sedimentation tank body. A mud discharge door drive motor is provided on the sedimentation tank body. A gear 27 is connected to the power output end of the mud discharge door drive motor. A rack meshing with the gear is provided on the rear side of the upper end of the mud discharge door. The gear transmission can drive the mud discharge door to move up and down. When the mud discharge door moves upward, the mud discharge port can be opened, and when the mud discharge door moves downward, the mud discharge port can be closed.

[0033] The sedimentation tank body also includes a left wall and a right wall located on the left and right sides of the front side wall and the rear side wall of the sedimentation tank. The fixed wall, the rear side wall, the left wall and the right wall of the sedimentation tank form a mud discharge space 29. A mud discharge auger 28 with an axis extending in the left and right directions is arranged in the mud discharge space 29. A mud discharge trough 35 is arranged on the right side of the mud discharge auger. The integrated sedimentation tank also includes a mud discharge pump connected to the mud discharge trough 35 through a mud discharge pipeline 36. The mud discharge auger includes an auger shell and an auger shaft 34 with a rotation axis extending in the left and right directions arranged in the auger shell. The auger shaft 34 is provided with a spiral conveying blade 31. The upper end of the auger shell is provided with a shell mud inlet 32 ​​extending in the left and right directions and communicating with the mud discharge port. The front and rear sides of the auger shell are respectively sealed and fixedly connected to the fixed wall and the vertical side wall. The auger shaft is driven by an auger motor 33.

[0034] In normal use, such as Figure 6 As shown, the mud discharge door closes the mud discharge port, and the second part of the movable wall of the movable wall is in a retracted state. The sludge normally falls into the aerobic tank through the mud settling port and the mud drop port. When the sludge concentration in the aerobic tank is relatively high, the second part of the movable wall of the movable wall extends, and the movable wall driving mechanism drives the movable wall to flip backward as a whole. The mud discharge door moves upward to open the mud discharge port, and the sludge in the sludge hopper is guided to the mud discharge port through the movable wall. The sludge enters the auger shell through the mud discharge port and the shell mud inlet. The auger shaft rotates with the spiral conveying blades to convey the sludge from left to right to the mud discharge trough, and the mud discharge pump discharges the sludge in the mud discharge trough to avoid excessive sludge concentration in the aerobic tank.

[0035] The rear air release port is opened on the rear side wall 20 of the sedimentation tank, and a bubble guide plate 24 is arranged on the upper side of the air release port. The bubble guide plate 24 is arranged to be gradually inclined downward from back to front. When the bubble moves from bottom to top through the mud outlet to the position of the bubble guide plate, the bubble guide plate 24 guides the bubble to the air release port 14, and the bubble is discharged through the air release port to avoid the bubble disturbing the mud outlet and affecting the aggregation and concentration of the sludge at the mud outlet.

[0036] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0038] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sewage treatment tank using an integrated sedimentation tank, comprising an anaerobic tank and an aerobic tank connected to each other, an aeration device being provided at the bottom of the aerobic tank, characterized in that: The sewage treatment tank also includes at least two integrated sedimentation tanks, each of which is sequentially arranged in the aerobic tank along the length direction of the aerobic tank. Each integrated sedimentation tank includes a sedimentation tank body, a water hole connected to the aerobic tank is arranged on the side wall of the sedimentation tank body, an inclined tube filler is arranged in the sedimentation tank body, and a water outlet trough extending along the width direction of the aerobic tank is arranged on the upper side of the inclined tube filler. The bottom of the sedimentation tank body is provided with a mud outlet spaced from the bottom of the aerobic tank.

2. The sewage treatment tank according to claim 1, characterized in that: The length direction of the aerobic pool is the front-to-back direction, and the width direction is the left-to-right direction. The length of the integrated sedimentation tank is extended along the left-to-right direction, and the width is extended along the front-to-back direction.

3. The sewage treatment tank according to claim 2, characterized in that: A sludge hopper with a larger upper part and a smaller lower part is arranged on the lower side of the inclined tube filler on the sedimentation tank body. The bottom of the sludge hopper is a sludge settling port. A distributor with an inverted V-shaped structure is arranged on the lower side of the sludge settling port. There are two sludge drop ports, which are formed between the front side of the distributor and the front side wall of the sedimentation tank body and between the rear side of the distributor and the rear side wall of the sedimentation tank body. The two sludge drop ports are respectively located on the front and rear sides of the sludge settling port.

4. The sewage treatment pool according to claim 3, characterized in that: The width of the mud outlet gradually narrows from top to bottom.

5. The sewage treatment pool according to claim 3, characterized in that: The upper side of each mud outlet is provided with an air release port, and the air release ports are distributed on the front and rear sides of the mud settling port.

6. The sewage treatment tank according to claim 2, characterized in that: The left side wall of the integrated sedimentation tank constitutes a guide wall, a water retaining plate is arranged on the left side of the guide wall, a water hole is arranged on the guide wall, and a water distribution channel is formed between the water retaining plate and the guide wall, the upper end of which is connected to the aerobic tank and the lower end of which is connected to the water hole.

7. The sewage treatment tank according to claim 2, characterized in that: The length of each water outlet trough is extended in the left-right direction, and the water outlet troughs of each integrated sedimentation tank are connected to the same water outlet pipe.

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