Sewage treatment tank using integrated sedimentation tank

Abstract

The utility model 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 further comprises at least two integrated sedimentation tanks, the integrated sedimentation tanks are sequentially arranged in the aerobic tank along the length direction of the aerobic tank, and the integrated sedimentation tanks are arranged in 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 utility model, 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 utility model relates to sewage treatment field especially uses a kind of sewage treatment tank of integrated sedimentation tank. BACKGROUND

[0002] China is a country of water resource shortage, with the continuous development of social economy, the large amount of sewage discharge causes the deterioration of natural water quality, and the water pollution prevention and control work has become the key content of environmental pollution prevention and control in China.

[0003] In sewage treatment, the traditional A-O (anaerobic-aerobic), A-A-O (anaerobic-anoxic-aerobic) process is the simplest process flow, and the most widely used biochemical system denitrification and phosphorus removal process. The existing sewage treatment equipment using AAO process, such as the treatment tank disclosed in the "integrated sewage treatment tank for improving AAO and sewage treatment method" of Chinese patent CN104891656B, the treatment tank, including anaerobic phosphorus removal zone, low oxygen aeration zone, enhanced aeration zone and sedimentation zone which are sequentially adjacent and integrally arranged and separated by partition wall; water flow channels are respectively arranged on each partition wall; the anaerobic phosphorus removal zone is divided into first anaerobic phosphorus removal zone and second anaerobic phosphorus removal zone by first partition wall, and water flow channels are respectively arranged at both ends of the first partition wall, and push-flow stirring devices are arranged 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 first low oxygen aeration zone and second low oxygen aeration zone by second partition wall, water flow channels are respectively arranged at both ends of the second partition wall, and air push-flow zone is arranged at the inlet end of the first low oxygen aeration zone; the sedimentation zone is communicated with the anaerobic phosphorus removal zone through sludge return channel; air push-flow device is arranged in the air push-flow zone; the air push-flow zone and the first low oxygen aeration zone are separated by partition wall.

[0004] The first low oxygen aeration zone, the second low oxygen aeration zone and the anaerobic zone, the enhanced aeration zone and the aerobic zone, the sewage in the anaerobic zone, using microorganisms to absorb and degrade COD, ammonia nitrogen, TN and TP, and at the same time, nitrification and denitrification reaction is carried out, so as to effectively remove part of the refractory organic matter, improve the removal efficiency of organic matter, and the absorption of phosphorus by microorganisms in the aerobic zone can be improved, and the removal efficiency of phosphorus can be improved. The mixed liquid treated by the aerobic zone enters the sedimentation zone for mud-water separation, and the separated sludge is partially returned to the anaerobic zone and the aerobic zone, and partially recycled and treated, and the returned sludge is used to adjust the sludge concentration in the corresponding tank, so that the ammonia nitrogen in the sludge can be effectively introduced into the biological reaction again, so as to increase the removal efficiency of suspended solids and organic matter.

[0005] The existing sewage treatment device has the following problems: the sedimentation zone is arranged outside the aerobic zone, so the sedimentation zone itself occupies a large land space, and for many old sewage plants, the land is very limited, and the size of the newly built tank is greatly limited. Utility model content

[0006] The utility model discloses a kind of wastewater treatment devices, which places integrated sedimentation tank in aerobic tank to reduce the land space of wastewater treatment tank.

[0007] To solve the above technical problems, the technical scheme of the wastewater treatment tank in the utility model is as follows:

[0008] A wastewater treatment tank using an integrated sedimentation tank includes an anaerobic tank and an aerobic tank connected. The bottom of the aerobic tank is provided with an aeration device. The wastewater treatment tank further includes 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 includes a sedimentation tank body. A water passing hole is arranged on the side wall of the sedimentation tank body and is connected to the aerobic tank. An inclined pipe filler is arranged in the sedimentation tank body. An upper side of the inclined pipe filler is provided with a water outlet groove extending along the width direction of the aerobic tank. The bottom of the sedimentation tank body is provided with a sludge outlet spaced from the bottom of the aerobic tank.

[0009] Further, the length direction of the aerobic tank is the front-rear direction, and the width direction is the left-right direction. The length of the integrated sedimentation tank extends along the left-right direction, and the width extends along the front-rear direction.

[0010] Further, a sludge hopper with a large upper part and a small lower part is arranged on the lower side of the inclined pipe filler on the sedimentation tank body. The bottom of the sludge hopper is a sludge outlet. A reverse V-shaped distributor is arranged on the lower side of the sludge outlet. There are two sludge outlets. The two sludge outlets 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 outlets are respectively located on the front and rear sides of the sludge outlet.

[0011] Further, the width of the sludge outlet gradually narrows from top to bottom.

[0012] Further, a gas release port is arranged on the upper side of each sludge outlet. The gas release ports are distributed on the front and rear sides of the sludge outlet.

[0013] Further, the left side wall of the integrated sedimentation tank constitutes a flow guide wall. A water baffle is arranged on the left side of the flow guide wall. The water passing hole is arranged on the flow guide wall. The water baffle and the flow guide wall form a water distribution channel connected to the aerobic tank at the upper end and connected to the water passing hole at the lower end.

[0014] Further, the length of each water outlet groove extends along the left-right direction. The water outlet grooves of each integrated sedimentation tank are connected to the same water outlet pipe.

[0015] The utility model discloses a beneficial effect is: the utility model discloses at least two integrated sedimentation tank along the length direction of the aerobic tank setting in the aerobic tank in proper order, will not increase the space of the aerobic tank, therefore can reduce the land occupation of sewage treatment tank, the clean water (the clean water layer of the inclined pipe filling material upside) of sedimentation tank produces is discharged through the water outlet groove, and the sludge of sedimentation tank produces is entered into the aerobic tank through the sludge outlet, has saved the corresponding reflux equipment, has reduced the sludge reflux energy consumption, according to different processing scale, can choose the integrated sedimentation tank of suitable number of layout in the aerobic tank. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present disclosure are shown by way of example, and wherein like or corresponding elements show like or corresponding parts, wherein:

[0017] Figure 1 is the use state diagram of the embodiment 1 of a sewage treatment tank in the utility model;

[0018] Figure 2 is Figure 1 the distribution schematic diagram of each integrated sedimentation tank in the aerobic tank in the utility model;

[0019] Figure 3 is Figure 1 the top view of the integrated sedimentation tank in the utility model;

[0020] Figure 4 is Figure 3 the 1-1 toward sectional view of the utility model;

[0021] Figure 5 is Figure 3 the 2-2 toward sectional view of the utility model;

[0022] Figure 6 is the structure schematic diagram of the integrated sedimentation tank in the embodiment 2 of a sewage treatment tank in the utility model;

[0023] Figure 7 is Figure 6 the cooperation schematic diagram of the sludge auger and sludge tank in the utility model;

[0024] Figure 8 is Figure 6 the enlarged view of A in the utility model;

[0025] Figure 9 is Figure 6 the enlarged view of B in the utility model;

[0026] 1, anaerobic tank; 2, aerobic tank; 3, integrated sedimentation tank; 4, effluent tank; 5, effluent pipe; 6, aeration device; 7, bubbles generated by the aeration device; 8, sedimentation tank body; 9, inclined pipe filler; 10, sludge hopper; 11, sludge drop hopper; 12, sludge drop port; 13, sludge drop port; 14, gas release port; 15, liquid level line; 16, flow guide wall; 17, water distribution channel; 18, clear water layer; 19, front side wall of the sedimentation tank; 20, rear side wall of the sedimentation tank;

[0027] 21, distributor; 22, movable wall; 23, fixed wall; 24, bubble guide plate; 25, sludge discharge port; 26, sludge discharge door; 27, gear; 28, sludge discharge auger; 29, sludge discharge space; 30, auger housing; 31, spiral conveying blade; 32, housing sludge inlet; 33, auger motor; 34, auger shaft; 35, sludge discharge tank; 36, sludge discharge pipeline; 37, length adjustment cylinder; 38, turnover adjustment cylinder; 39, first part of the movable wall; 40, second part of the movable wall; 41, connecting rod; 42, connecting rod avoidance long hole; 43, water passageway; 44, front side plate of the distributor; 45, rear side plate of the distributor. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described in the specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0029] It should be noted that, unless otherwise defined, all technical and scientific terms used in the specification have the same meaning as commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0030] Embodiment 1 of a sewage treatment tank in the present application is shown in Figures 1 to 5 The left and right arranged anaerobic tank 1 and aerobic tank 2, four integrated sedimentation tanks 3 are sequentially arranged along the front and rear direction in the aerobic tank 2, the integrated sedimentation tank 3 comprises a sedimentation tank body 8, the upper end of the sedimentation tank body 8 is supported and fixed on the tank rail of the aerobic tank, and 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 arranged along the front and rear direction.

[0031] The structure of each integrated sedimentation tank is the same, the length of the sedimentation tank body is arranged along the left and right direction, and the width of the sedimentation tank body is arranged along the front and rear direction.

[0032] The integrated sedimentation tank body 8 is used to be placed in the aerobic tank, the left side wall of the sedimentation tank body constitutes a guide wall 16, a water baffle is arranged on the left side of the guide wall 16, a water distribution channel 17 is formed between the water baffle and the guide wall, a water outlet 43 is arranged on the guide wall 16, the lower end of the water distribution channel is communicated with the water outlet, and the upper end of the water distribution channel is a water inlet of the water distribution channel communicated with the aerobic tank.

[0033] The inside of the sedimentation tank body is provided with an inclined pipe filler 9, the upper side of the inclined pipe filler in the sedimentation tank body is provided with a water outlet groove 4 for guiding the clean water out of the sedimentation tank body, the length of the water outlet groove extends in the left-right direction, the water outlet grooves of the integrated sedimentation tanks are connected to the same water outlet pipe 5, 18 in the figure represents a clean water layer, and 15 represents a liquid level line of the clean water layer.

[0034] The lower side of the inclined pipe filler in the sedimentation tank body is provided with a sludge hopper 10 with a large upper part and a small lower part, 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 outlet 12, and the sludge in the sludge hopper is concentrated by converging under the action of settlement and the front and rear side walls of the sludge hopper.

[0035] The lower side of the sludge hopper 10 in the sedimentation tank body is provided with a V-shaped distributor 21, the distributor 1 comprises a distributor front plate 44 and a distributor rear plate 45, the distributor front plate and the distributor rear plate form a V-shaped structure, the distributor front plate and the front side wall of the sedimentation tank body form a sludge outlet 13 communicated with the aerobic tank, the distributor rear plate and the rear side wall of the sedimentation tank body form a sludge outlet 13 communicated with the aerobic tank, the two sludge outlets are respectively located on the front and rear sides of the sludge outlet, and the width of each sludge outlet gradually narrows from top to bottom. The upper side of each sludge outlet is provided with a gas release port, and the gas release ports are distributed on the front and rear sides of the sludge outlet. In the embodiment, each gas release port is located on the upper side of the corresponding sludge outlet, the gas release port on the front side is located between the front side wall of the sludge hopper and the front side wall of the sedimentation tank body, and the gas release port on the rear side is located between the rear side wall of the sludge hopper and the rear side wall of the sedimentation tank body.

[0036] The surface load of the integrated sedimentation tank is designed to be 1.2-3.5 m³ / m²·h.

[0037] The inclination angle of the inclined pipe filler is designed to be 60°, and the vertical height is designed to be 0.866-1.5 m.

[0038] The water outlet groove is arranged along the length direction of the integrated sedimentation tank body, and the clean water is uniformly collected.

[0039] The length-width ratio of the integrated sedimentation tank needs to be 1:2-1:4, the water distribution channel is arranged on the side with shorter length of the sedimentation tank, the flow velocity of the water outlet hole at the bottom of the guide wall needs to be ≤0.3 m / s, and the low flow velocity increases the uniformity of water distribution.

[0040] The inclination of the front and rear side walls of the sludge hopper is 45°-60°, and the flow rate of the sludge outlet below the sludge hopper needs to be less than or equal to 0.1 m / s, and the sludge outlet is a through hole along the length direction of the sedimentation tank.

[0041] Each side wall of the distributor is single-sidedly inclined, and the single-sided inclination angle is 45°-60°, and the width of the bottom of each side wall of the distributor beyond the sludge outlet needs to be greater than or equal to 30 cm to prevent the bubbles from rising to the sludge outlet to agitate the sludge hopper area.

[0042] In the utility model, the sewage first enters the anaerobic tank, and then enters the aerobic tank, that is, the aeration tank, and according to the need, an integrated sedimentation tank with a proper number is placed in the aerobic tank to realize the sedimentation of sludge, which not only can reduce the land occupation space of the whole sewage treatment tank, but also can reduce the sludge backflow energy consumption; according to different treatment scales, a plurality of integrated sedimentation tanks can be used in parallel, which is suitable for small-scale and large-scale sewage treatment facilities; the sludge under the inclined pipe filler first deposits in the sludge hopper, is concentrated under the guidance of the front and rear side walls of the sludge hopper, and then is distributed to respective corresponding sludge outlets through the distributor, and is concentrated again at each sludge outlet, two-stage sedimentation is realized, the sedimentation efficiency is improved, and finally the concentrated sludge has a gravity greater than the buoyancy of the bubbles generated by the aeration device, so that the sludge can fall into the aerobic tank through the sludge outlet, the bubbles entering through the sludge outlet are discharged through the gas release port, the gas release port can reduce the disturbance of the bubbles to the sludge outlet, and the sludge can be concentrated smoothly in the sludge hopper.

[0043] An embodiment 2 of the sewage treatment tank is shown in Figures 6 to 9

[0044] In the embodiment 1, the sludge generated by the integrated sedimentation tank is continuously discharged into the aerobic tank, which may cause the sludge in the aerobic tank to be too much and too high, and in order to solve the problem, in the embodiment,

[0045] ​The front side wall of the sludge hopper is a movable wall 22 hingedly connected to the upper end of the pool body of the sedimentation tank, the hinging axis of the movable wall 22 extends in the left-right direction, a movable wall driving mechanism is arranged between the front side wall of the sedimentation tank and the movable wall to drive the movable wall to swing about the hinging axis, the movable wall driving mechanism is a turnover adjusting cylinder 38, one end of the turnover adjusting cylinder is hingedly connected to the front side wall of the sedimentation tank, and the other end of the turnover adjusting cylinder is hingedly connected to the movable wall. When the piston rod of the turnover adjusting cylinder is extended, the movable wall is turned backward. In the embodiment, the movable wall is a telescopic movable wall with adjustable length, the movable wall comprises a movable wall first part 39 and a movable wall second part 40 movably connected to the movable wall first part, the upper end of the movable wall first part is hingedly connected to the pool body of the sedimentation tank, the turnover adjusting cylinder is hingedly connected to the movable wall first part, a length adjusting cylinder 37 is arranged between the movable wall first part and the movable wall second part to drive the movable wall second part to extend and retract relative to the movable wall first part, the extension / retraction direction of the piston rod of the length adjusting cylinder is the same as the moving direction of the movable wall second part, the piston rod of the length adjusting cylinder is connected to the movable wall second part through a connecting rod 41, and a connecting rod avoiding long hole 42 is arranged at the lower end of the movable wall first part to avoid the connecting rod. When the piston rod of the length adjusting cylinder is extended, the movable wall second part can be extended out of the movable wall first part, so that the length of the whole movable wall is increased.

[0046] The rear side wall of the sludge hopper is a fixed wall 23 fixedly connected to the rear side wall of the pool body of the sedimentation tank, the fixed wall 23 is provided with a sludge discharge port 25 extending in the left-right direction, and the sludge discharge port 25 is provided with a sludge discharge door 26 capable of being opened and closed, specifically, the sludge discharge door 26 is movably connected to the pool body of the sedimentation tank, a sludge discharge door driving motor is arranged on the pool body of the sedimentation tank, a gear 27 is connected to the power output end of the sludge discharge door driving motor, a rack is arranged at the rear side of the upper end of the sludge discharge door and in meshing transmission with the gear, and the gear transmission can drive the sludge discharge door to move up and down. When the sludge discharge door moves upward, the sludge discharge port can be opened, and when the sludge discharge door moves downward, the sludge discharge port can be closed.

[0047] The pool body of the sedimentation tank further comprises a left side wall and a right side wall arranged 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 of the sedimentation tank, the left side wall and the right side wall enclose a sludge discharge space 29, the sludge discharge space 29 is provided with a sludge discharge auger 28 with an axis extending in the left-right direction, the right side of the sludge discharge auger is provided with a sludge discharge groove 35, and the integrated sedimentation tank further comprises a sludge discharge pump connected to the sludge discharge groove 35 through a sludge discharge pipeline 36. The sludge discharge auger comprises an auger shell and an auger shaft 34 with a rotating axis extending in the left-right direction 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 sludge inlet 32 extending in the left-right direction and communicating with the sludge discharge port, and the front and rear sides of the auger shell are sealingly and fixedly connected to the fixed wall and the vertical side wall, respectively. The auger shaft is driven by an auger motor 33.

[0048] In normal use, as shown in Figure 6 When the sludge concentration in the aerobic tank is relatively high, the movable wall second part is extended, the movable wall driving mechanism drives the movable wall as a whole to turn over backward, the sludge door moves upward to open the sludge discharge port, the sludge in the sludge hopper is guided to the sludge discharge port through the movable wall, the sludge enters the auger housing through the sludge discharge port and the housing sludge inlet, the auger shaft rotates with the spiral conveying blade to convey the sludge from left to right into the sludge discharge groove, and the sludge pump discharges the sludge in the sludge discharge groove to avoid excessive sludge concentration in the aerobic tank.

[0049] The rear gas release port is arranged on the rear wall 20 of the sedimentation tank, and a bubble guide plate 24 is arranged on the upper side of the gas release port. The bubble guide plate 24 is arranged to be gradually inclined downward from the rear to the front. When the bubbles move upward from the lower part to the position of the bubble guide plate, the bubble guide plate 24 guides the bubbles to the gas release port 14, and the bubbles are discharged through the gas release port to avoid the disturbance of the bubbles to the sludge discharge port, thereby affecting the concentration of the sludge at the sludge discharge port.

[0050] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, detachable connection, or integral; it can be mechanical connection, electrical connection; it can be direct connection, indirect connection through an intermediate medium, or internal connection of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0051] According to the above description of the present specification, those skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which is only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and is not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0052] In addition, the terms "first" or "second" and the like used in the present specification are terms used for the purpose of description of numbering or ordinal numbers only, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "a plurality of" is at least two, for example, two, three or more, and the like, unless otherwise specifically limited.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sewage treatment tank using an integrated sedimentation tank, comprising an anaerobic tank and an aerobic tank which are connected, and an aeration device is arranged at the bottom of the aerobic tank, characterized in that: The sewage treatment tank further comprises 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 of the integrated sedimentation tanks comprises a sedimentation tank body, a water passing hole is arranged on the side wall of the sedimentation tank body and is communicated with the aerobic tank, an inclined pipe filler is arranged in the sedimentation tank body, an upper side of the inclined pipe filler is provided with a water outlet groove extending along the width direction of the aerobic tank, a bottom of the sedimentation tank body is provided with a sludge falling port arranged at intervals with the bottom of the aerobic tank, the length direction of the aerobic tank is the front-rear direction, the width direction is the left-right direction, the length of the integrated sedimentation tank extends along the left-right direction, and the width extends along the front-rear direction, a sludge hopper with a large upper part and a small lower part is arranged on the sedimentation tank body at the lower side of the inclined pipe filler, the bottom of the sludge hopper is a sludge settling port, a reverse V-shaped distributor is arranged at the lower side of the sludge settling port, the sludge falling port has two, the two sludge falling ports 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 falling ports are respectively located on the front and rear sides of the sludge settling port, the upper side of each sludge falling port is provided with a gas releasing port, the gas releasing ports are distributed on the front and rear sides of the sludge settling port, and a sludge screw is located between the fixed wall, the bubble guide plate and the rear side wall of the sedimentation tank body.

2. The sewage treatment tank of claim 1, wherein: The width of the sludge falling port gradually narrows from top to bottom.

3. The sewage treatment tank of claim 1, wherein: The left side wall of the integrated sedimentation tank constitutes a flow guide wall, a water baffle is arranged on the left side of the flow guide wall, the water passing hole is arranged on the flow guide wall, and the water baffle and the flow guide wall form a water distribution channel communicated with the aerobic tank at the upper end and communicated with the water passing hole at the lower end.

4. The sewage treatment tank of claim 1, wherein: The length of each water outlet groove extends along the left-right direction, and the water outlet grooves of each integrated sedimentation tank are connected to the same water outlet pipe.

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