Activated sludge sewage treatment tank

Abstract

The utility model discloses an activated sludge sewage treatment tank which comprises a treatment tank body, a partition wall is arranged in the treatment tank body and divides the treatment tank body into an anaerobic tank, an anoxic tank and an aerobic tank, a first circulation opening is formed in the partition wall between the anaerobic tank and the anoxic tank, and a second circulation opening is formed in the partition wall between the anoxic tank and the aerobic tank. A second circulation opening is formed in a partition wall between the anoxic tank and the aerobic tank, and a discharge opening is formed in the tank wall of the aerobic tank; a reflux tank body is further arranged outside the treatment tank body, a total reflux inlet is formed in the tank wall between the reflux tank body and the aerobic tank, the reflux tank body surrounds the treatment tank body and extends to the anoxic tank, and a first branch reflux inlet is formed in the tank wall between the reflux tank body and the anoxic tank; and an opening adjusting device is arranged on the tank wall between the backflow tank body and the anoxic tank. According to the sewage treatment tank, sewage in the aerobic tank flows back to the anoxic tank through the backflow tank body, and meanwhile, some denitrifying bacteria flow back, so that the sewage treatment effect is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially relates to a kind of activated sludge sewage treatment tank. BACKGROUND

[0002] Activated sludge process is a kind of wastewater biological treatment technology, and it is the main method of wastewater biological treatment with activated sludge as the main body. This technology mixes and stirs wastewater and activated sludge (microorganisms) and aerates, so that the organic pollutants in wastewater are decomposed, and biological solids are then separated from the treated wastewater, and part of them can be returned to the aeration tank as needed. Activated sludge process is to continuously introduce air into wastewater, and after a certain period of time, sludge-like flocculation is formed due to the reproduction of aerobic microorganisms. The microorganism population mainly composed of zooglea on it has strong ability to adsorb and oxidize organic matter.

[0003] Among them, the A2 / O method is a common process in activated sludge method, and the treatment tank mainly includes anaerobic tank, anoxic tank and aerobic tank. The sewage flows through the anaerobic tank, anoxic tank and aerobic tank in turn. The wastewater and the returned sludge are fully mixed in the anaerobic tank, and after a certain period of anaerobic decomposition, part of the BOD is removed. Under the action of denitrification, part of the nitrogen compounds are converted into nitrogen gas and released. The phosphorus-releasing microorganisms in the returned sludge release phosphorus to meet the demand of bacteria for phosphorus.

[0004] Then the denitrifying bacteria in the anoxic tank use the undecomposed carbon-containing organic matter in the wastewater as carbon source to reduce the nitrate in the aerobic tank into N2 and release it.

[0005] Next, the wastewater flows into the aerobic tank, and the ammonia nitrogen in the water undergoes nitrification to generate nitrate. At the same time, the organic matter in the water is oxidized and decomposed to provide energy for the phosphorus-absorbing microorganisms. The microorganisms absorb phosphorus from the water, and the phosphorus enters the cell tissue and is enriched in the microorganisms. After sedimentation and separation, the phosphorus-rich sludge is discharged from the system. The sewage treatment tank is the core component to realize the above process. For example, the application file with publication number CN220149379U discloses a sewage treatment tank, which includes an anaerobic tank, an anoxic tank and an aerobic tank. Part of the water in the aerobic tank will flow back to the anaerobic tank, and then flow into the anoxic tank with the wastewater in the anaerobic tank. Obviously, this will send the wastewater with high oxygen content in the aerobic tank to the anaerobic tank, which will affect the oxygen content in the anaerobic tank and thus affect the ability and effect of the anaerobic bacteria to remove BOD. Secondly, in the disclosed document, the amount of returned wastewater cannot be adjusted. Because there are many types of wastewater, some wastewater contains high ammonia nitrogen, such as wastewater containing ammonium sulfate. This wastewater needs to enhance the treatment of ammonia nitrogen. The wastewater flows according to the set flow path in the anoxic tank, so the closer to the entrance of the anoxic tank, the greater the burden of the bacteria, which will also affect the treatment effect of the wastewater. UTILITY MODEL CONTENT

[0006] The utility model wants to solve the technical problem of providing a kind of activated sludge sewage treatment tank, the sewage treatment tank will wastewater in aerobic tank be backflowed to anoxic tank by backflow pool body, the nitrate of backflow is reduced to N2 and is released, and some denitrifying bacteria are backflowed simultaneously, to further improve sewage treatment effect.

[0007] To solve the above technical problem, the technical scheme of the utility model is: a kind of activated sludge sewage treatment tank, including the treatment pool body built in foundation, the inside of the treatment pool body is provided with the partition wall made of concrete, the partition wall is divided into anaerobic tank, anoxic tank and aerobic tank by the treatment pool body, the bottom of the aerobic tank is provided with aeration device, the pool wall of the anaerobic tank is provided with water inlet, the partition wall between the anaerobic tank and anoxic tank is provided with first flow-through, the partition wall between anoxic tank and aerobic tank is provided with second flow-through, the pool wall of the aerobic tank is provided with discharge port;The outside of the treatment pool body is also provided with backflow pool body, the pool wall between the backflow pool body and aerobic tank is provided with total backflow port, the backflow pool body surrounds the treatment pool body and extends to anoxic tank, the pool wall between the backflow pool body and anoxic tank is provided with first sub-backflow port, the pool wall between the backflow pool body and anoxic tank is provided with open adjusting device for controlling the opening and closing size of first sub-backflow port.

[0008] As a preferred scheme, the open adjusting device includes gantry fixed on pool wall, the gantry spans the first sub-backflow port, valve plate is installed on the gantry and is lifted and lowered slidingly, vertical guide rail is arranged on the two side walls of the first sub-backflow port, the two sides of the valve plate are slidably fitted with corresponding guide rail;The gantry is provided with open and close lifting power device for driving the valve plate to lift and lower.

[0009] As a preferred scheme, the open and close lifting power device includes driving motor fixed on the gantry, the upper end of the valve plate is provided with lifting screw rod, worm wheel is rotatably installed on the gantry and is threadedly matched with lifting screw rod, driving motor is provided with worm gear meshing with the worm wheel.

[0010] As a preferred scheme, the partition wall divides the treatment pool body into first quadrant region, second quadrant region, third quadrant region and fourth quadrant region, wherein first quadrant region and second quadrant region are used for anoxic tank, third quadrant region is used for aerobic tank, and fourth quadrant region is used for anaerobic tank;The first quadrant region and the second quadrant region are interconnected, the number of first sub-backflow port on the pool wall between the backflow pool body and anoxic tank is two and is communicated with first quadrant region and second quadrant region respectively, and the open adjusting device is arranged on each first sub-backflow port.

[0011] As a preferred scheme, the total reflux port and the second flow port are located at the upstream side of the aerobic tank, and the discharge port is located at the downstream side of the aerobic tank.

[0012] As a preferred scheme, a second sub-reflux port is further arranged on the partition wall between the aerobic tank and the anaerobic tank, and the second sub-reflux port is arranged at the bottom of the partition wall.

[0013] As a preferred scheme, the inner walls of the anaerobic tank, the anoxic tank and the aerobic tank are further provided with interlaced flow walls.

[0014] After the above technical scheme is adopted, the effect of the utility model is that: the external part of the treatment tank body is further provided with a reflux tank body, a total reflux port is arranged on the tank wall between the reflux tank body and the aerobic tank, the reflux tank body surrounds the treatment tank body and extends to the anoxic tank, a first sub-reflux port is arranged on the tank wall between the reflux tank body and the anoxic tank, therefore, the sewage in the aerobic tank can be directly refluxed to the anoxic tank; and because reflux is carried out through the reflux tank body, there is no aeration in the reflux tank body, so the process of reflux is similar to the anoxic section, thereby being beneficial to the survival of the denitrifying bacteria in the sludge; thus, some idle bacteria originally located at the downstream section of the anoxic tank can be refluxed, so that the denitrification reaction effect of the anoxic tank is improved; secondly, an opening adjusting device for controlling the opening and closing size of the first sub-reflux port is arranged on the tank wall between the reflux tank body and the anoxic tank, so that the reflux amount can be controlled through the opening adjusting device, thereby being capable of being flexibly adjusted according to the sewage conditions of different batches, and the flexibility is stronger.

[0015] In addition, the opening adjusting device comprises a portal frame fixed on the tank wall, the portal frame spans the first sub-reflux port, a valve plate is installed on the portal frame in a lifting and sliding manner, vertical guide rails are arranged on the two side walls of the first sub-reflux port, the two sides of the valve plate are in sliding fit with the corresponding guide rails, and opening and closing lifting power devices are arranged on the portal frame to drive the valve plate to lift, so that the opening area of the first sub-reflux port can be adjusted through the lifting of the valve plate, thereby adjusting the reflux amount.

[0016] Further, the separation wall divides the treatment pool body into a first quadrant region, a second quadrant region, a third quadrant region and a fourth quadrant region, wherein the first quadrant region and the second quadrant region are used for the anoxic pool, the third quadrant region is used for the aerobic pool, and the fourth quadrant region is used for the anaerobic pool; the first quadrant region and the second quadrant region are communicated with each other, the first sub-reflux port on the pool wall between the reflux pool body and the anoxic pool is two and is communicated with the first quadrant region and the second quadrant region respectively, and the opening adjusting device is arranged on each first sub-reflux port, so that the anoxic pool has two regions, and the sewage in the aerobic pool can be refluxed into the two regions respectively, so that the treatment burden of the denitrifying bacteria in the anoxic pool is dispersed, the treatment load is moved backward, and the load ratio of C:N:P in the treatment pool can be adjusted.

[0017] Further, the total reflux port and the second flow-through port are located on the upstream side of the aerobic pool, and the discharge port is located on the downstream side of the aerobic pool, so that the sewage in the anoxic pool can be quickly refluxed through the total reflux port after flowing into the aerobic pool from the second flow-through port, so that more surviving denitrifying bacteria in the sludge can be ensured.

[0018] Further, the second sub-reflux port is arranged on the bottom of the separation wall between the aerobic pool and the anaerobic pool, so that the sludge at the bottom of the aerobic pool can be refluxed into the anaerobic pool through the second sub-reflux port, and the demand of the bacteria in the anaerobic pool for phosphorus can be met. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in connection with the drawings and examples.

[0020] Figure 1 is the structural arrangement drawing of the utility model embodiment;

[0021] Figure 2 is Figure 1 the sectional view at A-A;

[0022] Figure 3 is Figure 2 the enlarged schematic view at B;

[0023] In the drawings: 1, treatment pool body; 2, separation wall; 3, anaerobic pool; 4, anoxic pool; 5, aerobic pool; 6, reflux pool body; 7, first flow-through port; 8, second flow-through port; 9, discharge port; 10, total reflux port; 11, first sub-reflux port; 12, aeration device; 13, opening adjusting device; 131, gantry; 132, valve plate; 133, guide rail; 134, lifting screw; 135, worm wheel; 136, worm; 137, drive motor. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below through specific embodiments.

[0025] As Figures 1 to 3 shown, an activated sludge sewage treatment tank, comprising a treatment tank body 1 built in a foundation, a partition wall 2 made of concrete is arranged inside the treatment tank body 1, and the treatment tank body 1 is divided into an anaerobic tank 3, an anoxic tank 4 and an aerobic tank 5 by the partition wall 2.

[0026] An aeration device 12 is arranged on the bottom of the aerobic tank 5, a water inlet is arranged on the tank wall of the anaerobic tank 3, a first flow-through port 7 is arranged on the partition wall 2 between the anaerobic tank 3 and the anoxic tank 4, a second flow-through port 8 is arranged on the partition wall 2 between the anoxic tank 4 and the aerobic tank 5, and a discharge port 9 is arranged on the tank wall of the aerobic tank 5; a reflux tank body 6 is further arranged outside the treatment tank body 1, a total reflux port 10 is arranged on the tank wall between the reflux tank body 6 and the aerobic tank 5, the reflux tank body 6 surrounds the treatment tank body 1 and extends to the anoxic tank 4, a first sub-reflux port 11 is arranged on the tank wall between the reflux tank body 6 and the anoxic tank 4, and an opening adjusting device 13 for controlling the opening and closing size of the first sub-reflux port 11 is arranged on the tank wall between the reflux tank body 6 and the anoxic tank 4.

[0027] In the embodiment, the partition wall 2 divides the treatment tank body 1 into a first quadrant region, a second quadrant region, a third quadrant region and a fourth quadrant region, wherein the first quadrant region and the second quadrant region are used for the anoxic tank 4, the third quadrant region is used for the aerobic tank 5, and the fourth quadrant region is used for the anaerobic tank 3; the first quadrant region and the second quadrant region are interconnected, the number of the first sub-reflux ports 11 on the tank wall between the reflux tank body 6 and the anoxic tank 4 is two, and each of the first sub-reflux ports 11 is connected with the first quadrant region and the second quadrant region respectively, and the opening adjusting device 13 is arranged on each of the first sub-reflux ports 11.

[0028] As Figure 2 and Figure 3 shown, the opening adjusting device 13 comprises a portal frame 131 fixed on the tank wall, the portal frame 131 is made of stainless steel, the portal frame 131 can be fixed on the top of the tank wall through stainless steel screws, the portal frame 131 spans the first sub-reflux port 11, a valve plate 132 is installed on the portal frame 131 in a lifting and sliding manner, guide rails 133 are vertically arranged on the two side walls of the first sub-reflux port 11, the guide rails 133 are made of stainless steel and are fixed on the side walls, the two sides of the valve plate 132 are in sliding cooperation with the corresponding guide rails 133, and opening and closing lifting power devices are arranged on the portal frame 131 to drive the valve plate 132 to lift and descend.

[0029] The opening and closing lifting power device comprises a driving motor 137 fixed on the portal frame 131, a lifting screw rod 134 arranged at the upper end of the valve plate 132, a worm wheel 135 rotatably arranged on the portal frame 131 and threadedly matched with the lifting screw rod 134, and a worm 136 arranged on the driving motor 137 and engaged with the worm wheel 135. Of course, the opening and closing lifting power device can also be manually operated, and the worm 136 can be directly connected with an operating handle, so that the valve plate 132 is lifted by manually rotating the worm 136.

[0030] The total reflux port 10 and the second flow port 8 are located on the upstream side of the aerobic tank 5, and the discharge port 9 is located on the downstream side of the aerobic tank 5. The second sub-reflux port is further arranged on the partition wall 2 between the aerobic tank 5 and the anaerobic tank 3, and the second sub-reflux port is arranged at the bottom of the partition wall 2.

[0031] The inner walls of the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5 are further provided with interlaced flow walls.

[0032] The working principle of the utility model is that sewage and sludge returned from a sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank are fully mixed in the anaerobic tank 3, and part of dissolved oxygen (BOD) is removed through anaerobic decomposition for a certain time, and part of nitrogen-containing compounds is converted into nitrogen gas and released under the action of denitrification, and phosphorus is released from polyphosphorus microorganisms in the returned sludge to meet the demand of bacteria for phosphorus.

[0033] Then, the denitrification bacteria in the anoxic tank 4 perform denitrification reaction by taking the undecomposed carbon-containing organic matter in the sewage as a carbon source, so as to realize denitrification.

[0034] Next, the sewage flows into the aerobic tank 5, ammonia nitrogen in the water performs nitrification reaction to generate nitrate, and organic matter in the water is oxidized and decomposed to provide energy for phosphorus-absorbing microorganisms, the microorganisms absorb phosphorus from the water, the phosphorus enters the cell tissue and is enriched in the microorganisms, and the discharged sewage is separated through subsequent sedimentation and separation of the sedimentation tank, the secondary sedimentation tank and the tertiary sedimentation tank, and the water meeting the discharge standard is discharged, and the sludge in the sedimentation tank is respectively discharged and filtered by a filter press to form a sludge cake.

[0035] Part of the sewage in the aerobic tank 5 is returned to different sections in the anoxic tank 4, so as to disperse the load intensity of the bacteria in the anoxic tank 4, and the denitrification effect in the anoxic tank 4 is better.

[0036] The above-described embodiments are only descriptions of preferred embodiments of the utility model, and do not limit the scope of the utility model, and various modifications and improvements of the technical scheme of the utility model made without departing from the design spirit of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. An activated sludge sewage treatment tank comprising a treatment tank body constructed in a foundation, a partition wall made of concrete being provided inside the treatment tank body, the partition wall dividing the treatment tank body into an anaerobic tank, an anoxic tank and an aerobic tank, an aeration device being provided at the bottom of the aerobic tank, characterized in that: The water inlet is arranged on the pool wall of the anaerobic pool, the first flow-through port is arranged on the partition wall between the anaerobic pool and the anoxic pool, the second flow-through port is arranged on the partition wall between the anoxic pool and the aerobic pool, and the discharge port is arranged on the pool wall of the aerobic pool; the external part of the treatment pool body is further provided with a reflux pool body, the total reflux port is arranged on the pool wall between the reflux pool body and the aerobic pool, the reflux pool body surrounds the treatment pool body and extends to the anoxic pool, the first partial reflux port is arranged on the pool wall between the reflux pool body and the anoxic pool, and the opening adjusting device for controlling the opening and closing size of the first partial reflux port is arranged on the pool wall between the reflux pool body and the anoxic pool. ​ 2. An activated sludge sewage treatment tank as claimed in claim 1, characterised in that: The opening adjusting device comprises a portal frame fixed on the pool wall, the portal frame spans the first partial reflux port, a valve plate is slidingly installed on the portal frame, vertical guide rails are arranged on the two side walls of the first partial reflux port, and the two sides of the valve plate are slidingly matched with the corresponding guide rails; the portal frame is provided with an opening and closing lifting power device for driving the valve plate to lift and lower.

3. An activated sludge sewage treatment tank as claimed in claim 2, characterised in that: The opening and closing lifting power device comprises a driving motor fixed on the portal frame, a lifting screw is arranged at the upper end of the valve plate, a worm wheel that is threadedly matched with the lifting screw is rotatably installed on the portal frame, and a worm that is engaged with the worm wheel is arranged on the driving motor.

4. An activated sludge sewage treatment tank as claimed in claim 3, characterised in that: The partition wall divides the treatment pool body into a first quadrant region, a second quadrant region, a third quadrant region and a fourth quadrant region, wherein the first quadrant region and the second quadrant region are used for the anoxic pool, the third quadrant region is used for the aerobic pool, and the fourth quadrant region is used for the anaerobic pool; the first quadrant region and the second quadrant region are interconnected, the number of the first partial reflux ports on the pool wall between the reflux pool body and the anoxic pool is two, and each of the first partial reflux ports is connected with the first quadrant region and the second quadrant region respectively, and each of the first partial reflux ports is provided with the opening adjusting device.

5. An activated sludge sewage treatment tank as claimed in claim 4, characterised in that: The total reflux port and the second flow-through port are located on the upstream side of the aerobic pool, and the discharge port is located on the downstream side of the aerobic pool.

6. An activated sludge sewage treatment tank as claimed in claim 5, characterised in that: The partition wall between the aerobic pool and the anaerobic pool is further provided with a second partial reflux port, and the second partial reflux port is arranged at the bottom of the partition wall.

7. An activated sludge sewage treatment tank as claimed in claim 6, characterised in that: The inner walls of the anaerobic pool, the anoxic pool and the aerobic pool are further provided with interlaced flow walls.

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