Sewage treatment unit and sewage treatment system

Abstract

The utility model discloses a sewage treatment unit and a sewage treatment system, the sewage treatment unit comprises a tank body, and the tank body is provided with a water outlet; a flow separation wall is arranged in the tank body and close to the water outlet, a gap is formed between the bottom of the flow separation wall and the bottom wall of the tank body, and the flow separation wall divides the tank body into a mixing area and an overflowing area located on the side of the water outlet; a partition plate is arranged between the flow separation wall and the side wall, where the water outlet is located, of the tank body, the overflowing area is divided into a first overflowing area and a second overflowing area located above the first overflowing area by the partition plate, the mixing area is communicated with the first overflowing area through a gap, and the water outlet is located in the second overflowing area; a first water inlet is formed in the partition plate, a flow baffle is arranged at the first water inlet in a rotating connection mode, and the first water inlet can be closed or opened by rotating the flow baffle. The sewage treatment unit provided by the utility model solves the technical problem that the hydraulic retention time of sludge in the tank body is limited in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, concretely relates to a sewage treatment unit and sewage treatment system. BACKGROUND

[0002] With the acceleration of urbanization process and the improvement of environmental protection standard, as the mainstream technology of sewage treatment plant, AAO process plays an important role in treating organic matter, nitrogen and phosphorus pollutants. However, the process faces the problem of treatment capacity bottleneck caused by fixed pool structure in actual operation. The anaerobic tank, anoxic tank and aerobic tank of AAO process all need to maintain specific environmental conditions, but the fixed pool volume limits the dynamic adjustment ability of hydraulic retention time and microbial metabolism space. When encountering abnormal wastewater discharge, rain season water surge or pollutant concentration mutation, the existing pool body is difficult to realize load buffering through volume expansion or process reorganization, especially the active sludge amount in each pool body in the system cannot be reasonably controlled according to the pollutant concentration, resulting in unstable treatment of each index. These problems directly affect the stability of effluent, especially when the concentration of each pollutant in the influent exceeds the design threshold, which easily causes the risk of collapse of the activated sludge system. Under the background of strict environmental protection supervision and urgent demand for upgrading and reconstruction of sewage treatment plant, breaking through the pool limitation has become a key challenge for process optimization. SUMMARY

[0003] In view of the existing technical problems, the utility model aims at providing a sewage treatment unit and a sewage treatment system, which can solve the technical problem of limited hydraulic retention time of sludge in the pool in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A sewage treatment unit comprises a pool body, and a water outlet is arranged on the pool body; the structure characteristics are that a flow separation wall is arranged in the pool body and close to the water outlet, a gap is arranged between the bottom of the flow separation wall and the bottom wall of the pool body, and the flow separation wall divides the pool body into a mixing zone and a flow-through zone on the side of the water outlet; a partition plate is arranged between the flow separation wall and the side wall of the pool body where the water outlet is located, the partition plate divides the flow-through zone into a first flow-through zone and a second flow-through zone above the first flow-through zone, the mixing zone and the first flow-through zone are connected through the gap, and the water outlet is located in the second flow-through zone; a first water inlet is arranged on the partition plate, a flow baffle is rotatably connected at the first water inlet, and the first water inlet can be closed or opened by rotating the flow baffle.

[0006] COD concentration, NH3-N concentration, TN concentration and TP concentration in sewage are usually taken as sewage quality indexes, and the sewage quality is determined by setting the concentration range. When the sewage treatment unit normally treats sewage, the baffle is rotated to make the first water inlet in an open state, and the first flow area and the second flow area are connected. After the sewage is treated in the mixing area of the pool body, it enters the second flow area through the first flow area and the first water inlet and is discharged through the water outlet. When the concentration of the sewage inlet or outlet water exceeds the set range, it indicates that more activated sludge is needed to participate in the reaction in the sewage treatment unit. At this time, the first water inlet is closed every certain period of time to separate the first flow area and the second flow area. The flow stabilizing effect of the partition wall makes the sludge accumulate at the bottom of the first flow area, thereby increasing the sludge concentration in the pool body. By repeatedly opening and closing the first water inlet, the hydraulic retention time of the sludge in the pool body is prolonged, the treatment efficiency of the pool body is improved, and the sewage quality meets the standard.

[0007] Specifically, the first flow area is provided with a first agitator, and the mixing area is provided with a second agitator.

[0008] Preferably, the first agitator is arranged on the side wall of the pool body where the water outlet is located, and the height of the first agitator is not higher than the height of the bottom of the partition wall. The first agitator is arranged to push the sludge accumulated at the bottom of the first flow area to the mixing area, thereby further prolonging the hydraulic retention time of the sludge in the pool body.

[0009] Preferably, the second agitator is arranged on the upper part of the side wall of the pool body opposite to the water outlet. The first agitator and the second agitator are arranged to accelerate the circulation of the sewage in the pool body.

[0010] Preferably, the top of the partition wall is provided with a driving device, and the output end of the driving device is connected with the baffle through a cable. Under the drive of the driving device, the cable drives the baffle to rotate upward or downward. The upward rotation of the baffle makes the first water inlet in an open state, and the downward rotation of the baffle makes the first water inlet closed.

[0011] Based on the same inventive concept, the application also provides a sewage treatment system comprising at least two sewage treatment units as described above, the pool bodies in each sewage treatment unit are arranged in series, and a sedimentation tank is connected outside the pool body at the downstream end.

[0012] Preferably, the sewage treatment unit is provided with three stages, including the anaerobic tank sewage treatment unit, the anoxic tank sewage treatment unit and the aerobic tank sewage treatment unit arranged in sequence; the bottom of the aerobic tank sewage treatment unit is provided with a plurality of aeration heads, each aeration head is connected with a fan through a pipeline, and the pipeline, which is connected in communication between the aeration head located in the first flow area in the aerobic tank sewage treatment unit and the fan, is provided with a first valve. When the sewage quality in the aerobic tank sewage treatment unit is abnormal, the first valve is closed to make the end of the tank body in a static state, so that the sludge can be accumulated gradually at the end of the tank body.

[0013] Preferably, the tank body of the anaerobic tank sewage treatment unit, the anoxic tank sewage treatment unit and the aerobic tank sewage treatment unit is provided with a sludge concentration meter, the sedimentation tank is provided with a sludge pump and a sludge level meter; the sludge outlet pipe of the sludge pump extends into the tank body of the anaerobic tank sewage treatment unit, the anoxic tank sewage treatment unit and the aerobic tank sewage treatment unit respectively, and each extended sludge outlet pipe is provided with a second valve. The sludge pump is arranged to assist in adjusting the sludge concentration in each tank body.

[0014] Specifically, the tank body water inlet of the anaerobic tank sewage treatment unit and the water outlet of the sedimentation tank are provided with data monitoring instruments. The data monitoring instruments mainly monitor the COD concentration, the NH3-N concentration, the TN concentration and the TP concentration, and the data monitoring instruments are arranged to monitor the water quality indexes of the sewage treatment system.

[0015] Preferably, the fan, the first valve, the data monitoring instrument, the sludge concentration meter, the sludge pump, the sludge level meter and the second valve are electrically connected with the control system.

[0016] Compared with the prior art, the sewage treatment unit and the sewage treatment system have the following beneficial effects:

[0017] 1. The sewage treatment unit and the sewage treatment system can adjust the activated sludge concentration in the tank body, thereby prolonging the hydraulic retention time of the sludge in the tank body.

[0018] 2. The sewage treatment unit and the sewage treatment system effectively improve the treatment efficiency of the tank body and solve the technical problem of fixed treatment efficiency caused by the fixed volume of the tank body.

[0019] 3. The sewage treatment unit and the sewage treatment system effectively solve the problem of unstable effluent caused by the difficulty of volume expansion of the existing tank body when the wastewater discharge is abnormal, the water volume increases sharply in the rainy season or the pollutant concentration suddenly changes. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the sewage treatment unit of the utility model;

[0021] Figure 2 is a structural schematic view of the sewage treatment system of the utility model.

[0022] In the drawings

[0023] 1 - pool body; 2 - water outlet; 3 - gap; 4 - first water inlet; 5 - baffle; 6 - partition wall; 7 - stay; 8 - first agitator; 9 - second agitator; 10 - sedimentation tank; 11 - anaerobic tank sewage treatment unit; 12 - anoxic tank sewage treatment unit; 13 - aerobic tank sewage treatment unit; 14 - aeration head; 15 - fan; 16 - first valve; 17 - data monitor; 18 - sludge concentration meter; 19 - sludge pump; 20 - sludge level meter; 21 - second valve; 22 - control system; 23 - water inlet pipe; 24 - water outlet pipe; 25 - third valve; 26 - driving device; 27 - mixing zone; 28 - overflow zone; 2801 - first overflow zone; 2802 - second overflow zone; 29 - partition. DETAILED DESCRIPTION

[0024] The utility model will be explained in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left", "right" appear in the following text, they only mean consistent with the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

[0025] As Figure 1As shown, the sewage treatment unit of the embodiment comprises a pool body 1, which is provided with a water outlet 2 at the upper part of the right side wall. A flow separation wall 6 is arranged in the pool body 1 near the water outlet 2, and a gap 3 is formed between the bottom of the flow separation wall 6 and the bottom wall of the pool body 1. The flow separation wall 6 divides the pool body 1 into a mixing zone 27 and a flow-through zone 28 located at the side of the water outlet 2. A partition 29 is arranged between the flow separation wall 6 and the side wall of the pool body 1 where the water outlet 2 is located. The partition 29 divides the flow-through zone 28 into a first flow-through zone 2801 and a second flow-through zone 2802 located above the first flow-through zone 2801. The mixing zone 27 and the first flow-through zone 2801 are connected through the gap 3, and the water outlet 2 is located in the second flow-through zone 2802. The partition 29 is provided with a first water inlet 4, and a rotating flow baffle 5 is arranged at the first water inlet 4. The top of the flow separation wall 6 is provided with a driving device 26, and the output end of the driving device 26 is connected to the flow baffle 5 through a cable 7. Under the drive of the driving device 26, the cable 7 drives the flow baffle 5 to rotate upward or downward. The downward rotation of the flow baffle 5 can close the first water inlet 4, so as to isolate the first flow-through zone 2801 and the second flow-through zone 2802. The upward rotation of the flow baffle 5 can open the first water inlet 4, so as to connect the first flow-through zone 2801 and the second flow-through zone 2802 through the first water inlet 4. A first agitator 8 is arranged on the right side wall of the pool body 1, and the height of the first agitator 8 is lower than the height of the bottom of the flow separation wall 6. A second agitator 9 is arranged on the upper part of the left side wall of the pool body 1, and the second agitator 9 is arranged opposite to the first agitator 8.

[0026] As Figure 2As shown, the sewage treatment system of the embodiment includes three sewage treatment units as described above, the pool bodies 1 in the three sewage treatment units are arranged in series, the pool body 1 at the downstream end is connected with a sedimentation tank 10, and the right side wall of the upper part of the sedimentation tank 10 is provided with a water outlet pipe 24. The three sewage treatment units are an anaerobic tank sewage treatment unit 11, an anoxic tank sewage treatment unit 12 and an aerobic tank sewage treatment unit 13. The left side wall of the upper part of the pool body 1 of the anaerobic tank sewage treatment unit 11 is provided with a water inlet pipe 23. The bottom of the aerobic tank sewage treatment unit 13 is provided with a plurality of aeration heads 14, each aeration head 14 is connected with a fan 15 through a pipeline, and the pipeline connected with the fan 15 of the aeration head 14 located in the first flow area 2801 in the aerobic tank sewage treatment unit 13 is provided with a first valve 16, and the pipelines connected with the fan 15 of the other aeration heads 14 are provided with third valves 25. The pool bodies 1 of the anaerobic tank sewage treatment unit 11, the anoxic tank sewage treatment unit 12 and the aerobic tank sewage treatment unit 13 are all provided with sludge concentration meters 18, and the sedimentation tank 10 is provided with a sludge pump 19 and a sludge level meter 20. The sludge outlet pipe of the sludge pump 19 extends into the pool body 1 of the anaerobic tank sewage treatment unit 11, the anoxic tank sewage treatment unit 12 and the aerobic tank sewage treatment unit 13, and each extended sludge outlet pipe is provided with a second valve 21. The water inlet of the pool body 1 of the anaerobic tank sewage treatment unit 11 and the water outlet of the sedimentation tank 10 are both provided with a data monitoring instrument 17, and the first agitator 8, the second agitator 9, the fan 15, the first valve 16, the data monitoring instrument 17, the sludge concentration meter 18, the sludge pump 19, the sludge level meter 20, the second valve 21, the third valve 25 and the driving device 26 are all electrically connected with a control system 22. Among them, the sludge concentration meter 18 is used to measure the concentration of activated sludge in sewage, the sludge level meter 20 is used to monitor the real-time activated sludge level of the sedimentation tank, and the data detection instrument 17 is used to monitor the COD concentration, NH3-N concentration, TN concentration and TP concentration in the inlet and outlet water. According to the conventional municipal sewage inlet fluctuation value, the following inlet and outlet water indexes are set:

[0027] Units (mg / L) COD [COD] TN TP Influent 100-500 10-50 15-60 1-10 Effluent 50 5 15 0.5

[0028] When the four indicators of the sewage treatment system are stable, open all the first agitator 8, the second agitator 9, the first valve 16, the third valve 25 and the fan 15, and close the second valve 21. Start the driving device 26 on each flow partition wall 6, so that the first water inlet 4 in each pool body 1 is in an open state. The sewage enters the pool body of the anaerobic pool sewage treatment unit 11 through the water inlet pipe 23, and the phosphorus bacteria in the activated sludge in the pool body of the anaerobic pool sewage treatment unit 11 absorb the COD in the sewage, reducing the COD concentration in the sewage. The treated sewage enters the pool body of the anoxic pool sewage treatment unit 12 through the water outlet 2, and the activated sludge in the pool body of the anoxic pool sewage treatment unit 12 performs denitrification reaction, converting nitrate in the sewage into nitrogen, reducing the TN concentration in the sewage. The treated sewage enters the pool body of the aerobic pool sewage treatment unit 13 through the water outlet 2, and the activated sludge in the pool body of the aerobic pool sewage treatment unit 13 performs nitrification reaction, converting NH3-N into nitrate, and the phosphorus bacteria reproduce and absorb TP, reducing the NH3-N concentration and TP concentration in the sewage. Finally, the treated sewage enters the sedimentation tank 10 through the water outlet 2, and the mud-water separation is realized through the sedimentation tank 10, and the supernatant is discharged through the water outlet pipe 24.

[0029] When the system effluent NH3-N rises or the influent NH3-N rises, it indicates that more activated sludge is needed to participate in the nitrification reaction in the aerobic pool sewage treatment unit 13. At this time, the first valve 16 and the first agitator 8 are closed, and the first flow area 2801 of the aerobic pool sewage treatment unit 13 is in a static state. The activated sludge flows into the mixing area 27 of the aerobic pool sewage treatment unit 13, and through the flow stabilization of the flow partition wall 6, the sludge will gradually accumulate at the bottom of the first flow area 2801 at the end. Every 15 minutes (adjustable), the first water inlet 4 is closed by rotating the baffle 5 through the driving device 26 on the aerobic pool sewage treatment unit 13 to prevent the activated sludge from overflowing. And quickly open the first agitator 8 for 30 seconds (adjustable), quickly push the sludge at the bottom of the first flow area 2801 to the mixing area 27, ensure that the sludge concentration in the pool body is the highest value in the three groups of pool bodies, and the specific sludge concentration can be measured by a sludge concentration meter.

[0030] When the system effluent TN rises or the influent TN rises, it indicates that more activated sludge needs to be involved in the anoxic tank wastewater treatment unit 12 for denitrification. At this time, the first agitator 8 is closed, and the first flow area 2801 of the anoxic tank wastewater treatment unit 12 is in a static state. The activated sludge flows into the mixing area 27 of the anoxic tank wastewater treatment unit 12, and through the flow stabilization of the partition wall 6, the sludge will gradually accumulate at the bottom of the first flow area 2801 at the end. Every 15 minutes (adjustable), the baffle 5 is rotated by the driving device 26 on the anoxic tank wastewater treatment unit 12 to close the first water inlet 4, preventing the activated sludge from overflowing. And quickly open the first agitator 8 for 30 seconds (adjustable), quickly push the sludge at the bottom of the first flow area 2801 to the mixing area 27, ensure that the sludge concentration in the pool body is at the highest value in the three groups of pool bodies, and the specific sludge concentration can be measured by a sludge concentration meter.

[0031] When the system effluent TP rises or the influent TP rises, it indicates that more activated sludge needs to be involved in the anaerobic tank wastewater treatment unit 11 for anaerobic reaction and in the aerobic tank wastewater treatment unit 13 for nitrification. The operation in the aerobic tank wastewater treatment unit 13 can refer to the related operation of NH3-N rising to improve the sludge concentration in the pool body of the aerobic tank wastewater treatment unit 13. The first agitator 8 of the anaerobic tank wastewater treatment unit 11 is closed, and the first flow area 2801 of the anaerobic tank wastewater treatment unit 11 is in a static state. The activated sludge flows into the mixing area 27 of the anaerobic tank wastewater treatment unit 11, and through the flow stabilization of the partition wall 6, the sludge will gradually accumulate at the bottom of the first flow area 2801 at the end. Every 15 minutes (adjustable), the baffle 5 is rotated by the driving device 26 on the anaerobic tank wastewater treatment unit 11 to close the first water inlet 4, preventing the activated sludge from overflowing. And quickly open the first agitator 8 for 30 seconds (adjustable), quickly push the sludge at the bottom to the front end of the pool body, improve the sludge concentration in the pool body of the anaerobic tank wastewater treatment unit 11, and thus strengthen the removal of TP.

[0032] At the same time, the strengthening removal of NH3-N and TN can also be assisted by adjusting the second valve 21 on the sludge pipeline to adjust the sludge concentration in each pool. The mud level meter 20 in the sedimentation tank 10 and the real-time uploading of the sludge concentration data in each pool to the control system 22 are calculated to determine whether the current total sludge amount meets the removal of pollutants, and real-time reference parameters are given, such as when the activated sludge concentration in the system is insufficient to remove COD, NH3-N, TN, and TP, the control system 22 will give relevant feedback.

[0033] The above-mentioned embodiments should be understood as being only for more clearly describing the utility model, and are not used for limiting the scope of the utility model, and after reading the utility model, various equivalent modification of the embodiments made by those skilled in the art all fall into the range defined by the utility model claims.

Claims

1. A sewage treatment unit comprising a tank body (1) provided with a water outlet (2); characterized in that: The pool body (1) is provided with a flow separation wall (6) near the water outlet (2), and a gap (3) is formed between the bottom of the flow separation wall (6) and the bottom wall of the pool body (1), so that the pool body (1) is divided into a mixing area (27) and a flow-through area (28) on the side of the water outlet (2); The flow separation wall (6) is provided with a partition plate (29) between the side wall on which the water outlet (2) is located and the pool body (1), so that the flow-through area (28) is divided into a first flow-through area (2801) and a second flow-through area (2802) located above the first flow-through area (2801), and the mixing area (27) and the first flow-through area (2801) are connected through the gap (3), and the water outlet (2) is located in the second flow-through area (2802). The partition plate (29) is provided with a first water inlet (4), and a rotating baffle (5) is rotatably connected to the first water inlet (4), so that the first water inlet (4) can be closed or opened by rotating the baffle (5).

2. A sewage treatment unit according to claim 1 characterised in that: The first flow-through area (2801) is provided with a first agitator (8), and the mixing area (27) is provided with a second agitator (9).

3. A sewage treatment unit according to claim 2, characterised in that: The first agitator (8) is arranged on the side wall of the pool body (1) on which the water outlet (2) is located, and the height of the first agitator (8) is not higher than the height of the bottom of the flow separation wall (6).

4. A sewage treatment unit as claimed in claim 2 or 3, characterised in that: The second agitator (9) is arranged on the upper part of the side wall of the pool body (1) opposite to the water outlet (2).

5. The unit for sewage treatment according to claim 1, characterized in that: The top of the flow separation wall (6) is provided with a driving device (26), and the output end of the driving device (26) is connected with the baffle (5) through a cable (7); under the driving of the driving device (26), the cable (7) drives the baffle (5) to rotate upward or downward.

6. A sewage treatment system characterised in that: The sewage treatment unit comprises at least two stages of sewage treatment units as claimed in any one of claims 1 to 5, the pool bodies (1) in the sewage treatment units are arranged in series, and a sedimentation tank (10) is connected to the outside of the pool body (1) at the downstream end.

7. The sewage treatment system of claim 6, wherein: The sewage treatment unit is provided with three stages, including an anaerobic pool sewage treatment unit (11), an anoxic pool sewage treatment unit (12) and an aerobic pool sewage treatment unit (13) arranged in sequence; the bottom of the aerobic pool sewage treatment unit (13) is provided with a plurality of aeration heads (14), each aeration head (14) is connected with a fan (15) through a pipeline, and the aeration head (14) located in the first flow-through area (2801) in the aerobic pool sewage treatment unit (13) is provided with a first valve (16) on the pipeline connected with the fan (15).

8. The sewage treatment system of claim 7, wherein: The pool bodies (1) of the anaerobic pool sewage treatment unit (11), the anoxic pool sewage treatment unit (12) and the aerobic pool sewage treatment unit (13) are all provided with sludge concentration meters (18), and the sedimentation tank (10) is provided with a sludge pump (19) and a sludge level meter (20); the sludge discharge pipes of the sludge pump (19) extend into the pool bodies (1) of the anaerobic pool sewage treatment unit (11), the anoxic pool sewage treatment unit (12) and the aerobic pool sewage treatment unit (13) respectively, and each extending sludge discharge pipe is provided with a second valve (21).

9. The sewage treatment system of claim 8, wherein: The data monitor (17) is arranged at the water inlet of the pool body (1) of the anaerobic pool sewage treatment unit (11) and at the water outlet of the sedimentation pool (10).

10. The sewage treatment system of claim 9, wherein: The fan (15), the first valve (16), the data monitor (17), the sludge concentration meter (18), the sludge pump (19), the mud level meter (20) and the second valve (21) are electrically connected with the control system (22).

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