Domestic sewage treatment device

Abstract

The utility model provides a domestic sewage treatment device which comprises a water treatment box body, a mixed liquid reflux mechanism, a sludge reflux mechanism, an ultraviolet sterilizer and a controller, the water treatment box body is divided into an anaerobic tank, an anoxic tank, an aerobic tank, an MBR (Membrane Biological Reactor) membrane tank, a clean water tank and an equipment room by partition plates A; a water outlet of the anaerobic tank, a water outlet of the anoxic tank and a water outlet of the aerobic tank are respectively provided with a mud-water separation mechanism, the aerobic tank is divided into a plurality of areas with communicated upper parts through a partition plate B, each area is provided with an aeration disc, an aeration pipe provided with a ball valve and a DO detector, one end of each aeration pipe is connected with the corresponding aeration disc, and the other end of each aeration pipe is connected with the corresponding aeration disc. The other end of the aeration pipe is connected with an aeration pipe A. The aeration pipe A is connected with an air blower. According to the utility model, the energy can be effectively saved, the treatment efficiency can be effectively improved, the removal rates of COD, NH3-N, TN and TP can be effectively improved, and the purposes of energy conservation, efficiency improvement and capacity expansion are achieved, so that the load pressure of subsequent devices and processes is reduced.

Description

A domestic sewage treatment device Technical Field

[0001] This utility model relates to a domestic sewage treatment device, belonging to the field of water treatment. Background Technology

[0002] The treatment of domestic sewage generally includes the following steps: First, the sewage passes through pretreatment units such as screens and booster pumps to remove large particulate impurities. Next, the sewage undergoes biochemical treatment using a combination of anaerobic, anoxic, and aerobic processes, resulting in biodegradation and nitrification / denitrification. Finally, the biologically treated sewage enters an MBR membrane tank, where the supernatant after membrane separation is disinfected with ultraviolet light before discharge or reuse. The biological treatment units achieve carbon removal, nitrogen removal, and phosphorus removal in sewage treatment, and are key steps in achieving effective sewage treatment. They are crucial to the efficiency and effectiveness of the treatment process.

[0003] The main technologies used in the biochemical treatment units of existing domestic sewage treatment equipment include activated sludge process, biofilm process, and combined anaerobic and aerobic process. These technologies require continuous oxygen supply, consume a lot of energy, and are prone to sludge bulking problems. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by providing a domestic sewage treatment device that effectively saves energy and improves treatment efficiency through zoned aeration of the aerobic tank.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] This utility model provides a domestic sewage treatment device, including a water treatment tank, a mixed liquor return mechanism, a sludge return mechanism, an ultraviolet sterilizer and a controller. The water treatment tank is divided into an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a clear water tank and an equipment room by a partition A. Domestic sewage passes through the anaerobic tank, anoxic tank, aerobic tank, MBR membrane tank and clear water tank in sequence.

[0007] The outlets of the anaerobic tank, the anoxic tank, and the aerobic tank are all equipped with mud-water separation mechanisms.

[0008] The aerobic tank is divided into multiple interconnected areas by partition B. Each area is equipped with an aeration disc, an aeration pipe with a ball valve, and a DO detector. One end of the aeration pipe is connected to the corresponding aeration disc, and the other end of the aeration pipe is connected to aeration pipe A. Aeration pipe A is connected to a blower, and a check valve and a ball valve are installed on aeration pipe A.

[0009] The MBR membrane tank is equipped with perforated aeration pipes, which are connected to the blower via aeration pipe B equipped with a check valve and a ball valve.

[0010] The mixed liquor reflux mechanism includes a mixed liquor reflux pipe and a mixed liquor reflux pump installed in the aerobic tank. One end of the mixed liquor reflux pipe is connected to the mixed liquor reflux pump, and the other end of the mixed liquor reflux pipe is connected to the anoxic tank.

[0011] The sludge return mechanism includes a sludge return pipe and a sludge return pump installed in the MBR membrane tank. One end of the sludge return pipe is connected to the sludge return pump through a ball valve, and the other end of the sludge return pipe is connected to a tee. The other two ends of the tee are connected to the anaerobic tank and the sludge discharge pipe, respectively. A ball valve is installed on the sludge discharge pipe.

[0012] The backwash pump of the clear water tank is connected to the self-priming pump through a pipeline, the self-priming pump is connected to the ultraviolet sterilizer, and the outlet of the ultraviolet sterilizer is connected to the clear water tank through a pipeline equipped with a rotor flow meter.

[0013] The blower, self-priming pump, UV sterilizer and controller are all located in the equipment room. Each ball valve, each check valve, blower, self-priming pump, UV sterilizer, sludge return pump, mixed liquor return pump, rotor flow meter, backwash pump and each DO detector are electrically connected to the controller.

[0014] In one specific embodiment, the outlet of the anaerobic tank is connected to the anoxic tank via a pipeline, the outlet of the anoxic tank is connected to the aerobic tank via a pipeline, and the aerobic tank and the MBR membrane tank are connected via a water outlet, which is the outlet of the aerobic tank.

[0015] In one specific implementation, the MBR membrane tank is equipped with a suction pump, which is connected to a clear water tank and electrically connected to a controller.

[0016] In one specific embodiment, the anaerobic tank is provided with an inlet pipe, one end of which extends from the upper part of the anaerobic tank to the lower part of the anaerobic tank.

[0017] In one specific embodiment, the sludge-water separation mechanism has an inner cavity A, and a sludge return port is provided at the bottom of cavity A. The inner cavity of cavity A is divided into two cavities B with their bottoms connected by a partition C. The cavities of the sludge-water separation mechanism are surrounded by perforated plates.

[0018] In one specific implementation, the sludge discharge pipe extends to the sludge pond.

[0019] In one specific embodiment, the MBR membrane tank is equipped with an MBR membrane module, an acid washing and dosing device, and a sodium hypochlorite dosing device. Both the acid washing and dosing devices are arranged in the equipment room and are electrically connected to the controller. Both the acid washing and dosing devices are connected to the MBR membrane tank through dosing pipes.

[0020] In one specific implementation, the clear water tank is equipped with a water outlet pipe.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. This utility model divides the aerobic tank into multiple interconnected zones, each equipped with a DO detector. Each DO detector measures the dissolved oxygen concentration in its corresponding zone and transmits the data to a controller. The controller adjusts the blower's airflow and the opening of the corresponding ball valve in real time based on the received dissolved oxygen concentration information to achieve zoned aeration of the aerobic tank. This significantly reduces the energy consumed by the blower within the same aeration time. Furthermore, it not only improves the utilization efficiency of dissolved oxygen in the aerobic tank but also stimulates the activity of microbial cells in the water through a bacterial starvation acclimation mechanism, thereby improving the overall efficiency of wastewater treatment and increasing the removal rates of COD, NH3-N, TN, and TP.

[0023] 2. The sludge-water separation mechanism of this utility model intercepts part of the activated sludge, so that the effective activated sludge in the corresponding biological treatment tank is intercepted and returned to the original tank, effectively maintaining the number of effective bacteria in each biological treatment tank, promoting the formation of dominant bacteria, reducing sludge mixing, improving sludge utilization rate, and improving the removal rate of COD, NH3-N, TN, and TP. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of this utility model.

[0025] Attached reference numerals: 1. Anaerobic tank; 2. Anoxic tank; 3. Aerobic tank; 4. MBR membrane tank; 5. Clear water tank; 6. Equipment room; 7. Ultraviolet sterilizer; 8. Sludge-water separation mechanism; 9. Blower; 10. Ball valve; 11. Check valve; 12. Inlet pipe; 21. Mixed liquor return pipe; 31. Zone; 32. Aeration disc; 33. Aeration pipe; 34. Mixed liquor return pump; 35. Aeration pipe A; 41. Perforated aeration pipe; 42. Aeration pipe B; 43. MBR membrane module; 44. Sludge return pump; 45. Sludge return pipe; 46. Sludge discharge pipe; 51. Backwash pump; 52. Self-priming pump; 53. Acid washing dosing device; 54. Sodium hypochlorite dosing device; 55. Outlet pipe; 56. Solenoid valve; 71. Rotor flow meter; 81. Sludge return port; 82. Baffle plate C. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0027] As shown in Figure 1, the present invention provides a domestic sewage treatment device, including a water treatment tank, a mixed liquor return mechanism, a sludge return mechanism, an ultraviolet sterilizer 7, and a controller. The water treatment tank is divided into an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, an MBR membrane tank 4, a clear water tank 5, and an equipment room 6 by a partition A. Domestic sewage passes through the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3, the MBR membrane tank 4, and the clear water tank 5 in sequence.

[0028] Anaerobic tank 1 receives domestic sewage treated by bar screen and return sludge from MBR membrane tank 4, creating an anaerobic environment to enhance the anaerobic phosphorus release effect of polyphosphate-accumulating bacteria.

[0029] Anoxic tank 2 serves as a pretreatment for the aerobic tank 3 and MBR membrane tank 4, improving and enhancing the biodegradability of wastewater, thereby increasing the rate of subsequent biochemical reactions, reducing energy consumption, and lowering operating costs. Nitrate nitrogen is delivered from the aerobic tank through a mixed liquor reflux mechanism, and the wastewater undergoes denitrification in anoxic tank 2 to remove nitrogen. Anoxic tank 2 is filled with combined packing material.

[0030] After treatment in the anoxic tank 2, the wastewater enters the aerobic tank 3. Most of the organic matter in the original wastewater is degraded and purified in the aerobic tank 3. Aerobic bacteria, using the packing material as a carrier, utilize the organic matter in the wastewater as food, decomposing it into inorganic salts. Simultaneously, they digest and absorb phosphorus, thereby achieving the purpose of purifying the wastewater. The survival of aerobic bacteria requires sufficient oxygen, meaning there must be enough dissolved oxygen in the wastewater. Air in the aerobic tank 3 is supplied by a blower 9, and the aerobic tank 3 is equipped with packing material.

[0031] After being treated in aerobic tank 3, the wastewater enters MBR membrane tank 4, where activated sludge and macromolecular organic matter in the wastewater are intercepted, effectively increasing the concentration of activated sludge.

[0032] Water in MBR membrane tank 4 enters the clear water tank, and water in clear water tank 5 enters the ultraviolet sterilizer 7 for disinfection before returning to the clear water tank for discharge or recycling.

[0033] The outlets of the anaerobic tank 1, the anoxic tank 2, and the aerobic tank 3 are all equipped with a sludge-water separation mechanism 8. Optionally, the sludge-water separation mechanism 8 has a cavity A inside, and a sludge return port 81 is provided at the bottom of the cavity A. The cavity A is divided into two cavities B with their bottoms connected by a partition C82. The cavity of the sludge-water separation mechanism 8 is surrounded by a perforated plate.

[0034] Before the mixed liquor flows out, the sludge-water separation mechanism 8 intercepts part of the activated sludge, so that the effective activated sludge in the corresponding biological treatment tank is intercepted and returned to the original tank, effectively maintaining the number of effective bacteria in each biological treatment tank, promoting the formation of dominant bacteria, reducing sludge mixing, improving sludge utilization, and improving the removal rates of COD, NH3-N, TN, and TP.

[0035] The anaerobic tank 1 is equipped with an inlet pipe 12, one end of which extends from the upper part of the anaerobic tank 1 to the lower part of the anaerobic tank 1. An inlet valve is installed on the inlet pipe 12, and the inlet valve is electrically connected to the controller.

[0036] Both the anaerobic tank 1 and the anoxic tank 2 are equipped with a stirring mechanism.

[0037] The aerobic tank 3 is divided into multiple interconnected areas 31 by a partition B. Each area 31 is equipped with an aeration disc 32, an aeration pipe 33 equipped with a ball valve 10, and a DO detector. One end of the aeration pipe 33 is connected to the corresponding aeration disc 32, and the other end of the aeration pipe 33 is connected to the aeration pipe A35. The aeration pipe A35 is connected to the blower 9, and a check valve 11 and a ball valve 10 are installed on the aeration pipe A35.

[0038] The aerobic tank 3 is divided into multiple interconnected zones 31. Each DO detector measures the dissolved oxygen concentration in its corresponding zone 31 and transmits the data to the controller. The controller adjusts the airflow of the blower 9 and the opening of the corresponding ball valve 19 in real time based on the received dissolved oxygen concentration information to achieve zoned aeration in the aerobic tank 3. During operation, the controller adjusts the airflow of the blower 9 and the opening of the corresponding ball valve 10, making some areas of the aerobic tank 3 aerobic zones and others anoxic zones. Furthermore, under the control of the controller, each aerobic zone can be converted to an anoxic zone, and vice versa. This conversion between aerobic and anoxic zones is continuous, significantly reducing the energy consumption of the blower 9 within the same aeration time. Simultaneously, it not only improves the utilization efficiency of dissolved oxygen in the aerobic tank 3 but also stimulates the activity of microbial cells in the water through a bacterial starvation acclimation mechanism, thereby improving the overall efficiency of wastewater treatment and further increasing the removal rates of COD, NH3-N, TN, and TP.

[0039] The MBR membrane tank is equipped with a perforated aeration pipe 41, which is connected to the blower 9 via an aeration pipe B42 equipped with a check valve 11 and a ball valve 10.

[0040] The clear water tank 5 is equipped with a water outlet pipe 55, and a water outlet valve is arranged on the water outlet pipe 55. The water outlet valve is electrically connected to the controller.

[0041] The mixed liquor reflux mechanism includes a mixed liquor reflux pipe 21 and a mixed liquor reflux pump 34 installed in the aerobic tank. One end of the mixed liquor reflux pipe 21 is connected to the mixed liquor reflux pump 34, and the other end of the mixed liquor reflux pipe 21 is connected to the anoxic tank 2, so that the mixed liquor is refluxed to the anoxic tank 2.

[0042] The sludge return mechanism includes a sludge return pipe 45 and a sludge return pump 44 installed in the MBR membrane tank 4. One end of the sludge return pipe 45 is connected to the sludge return pump 44 through a ball valve 10, and the other end of the sludge return pipe 45 is connected to a tee. The other two ends of the tee are respectively connected to the anaerobic tank 1 and the sludge discharge pipe 46. A ball valve 10 is installed on the sludge discharge pipe 46. Furthermore, the sludge discharge pipe 46 extends to the sludge tank.

[0043] The backwash pump 51 of the clear water tank 5 is connected to the self-priming pump 52 through a pipe. The self-priming pump 52 is connected to the ultraviolet sterilizer 7. The outlet of the ultraviolet sterilizer 7 is connected to the clear water tank 5 through a pipe equipped with a rotor flow meter 71. A check valve 11 and a solenoid valve 56 are arranged on the pipe connecting the backwash pump 51 and the self-priming pump 52. A check valve 11 and a ball valve 10 are arranged on the pipe connecting the self-priming pump 52 and the ultraviolet sterilizer 7. After the water in the clear water tank 5 is disinfected by the ultraviolet sterilizer 7, it returns to the clear water tank through the self-priming pump 52 for discharge or recycling.

[0044] Blower 9, self-priming pump 52, UV sterilizer 7 and controller are all located in the equipment room. Each ball valve 10, each check valve 11, blower 9, self-priming pump 52, UV sterilizer 7, sludge return pump 44, mixed liquor return pump 34, rotor flow meter 71, backwash pump 51 and each DO detector are electrically connected to the controller.

[0045] Preferably, the outlet of the anaerobic tank 1 is connected to the anoxic tank 2 via a pipe, the outlet of the anoxic tank 2 is connected to the aerobic tank 3 via a pipe, and the aerobic tank 3 and the MBR membrane tank 4 are connected via a water outlet, which is the outlet of the aerobic tank 3.

[0046] Furthermore, the MBR membrane tank 4 is equipped with a suction pump, which is connected to the clear water tank 5 and electrically connected to the controller. The suction pump draws water from the MBR membrane 4 to the clear water tank 5.

[0047] Specifically, the MBR membrane tank 4 is equipped with an MBR membrane module 43, an acid washing and dosing device 53, and a sodium hypochlorite dosing device 54. Both the acid washing and dosing device 53 and the sodium hypochlorite dosing device 54 are arranged in the equipment room 6. Both the acid washing and dosing device 53 and the sodium hypochlorite dosing device 54 are electrically connected to the controller. Both the acid washing and dosing device 53 and the sodium hypochlorite dosing device 54 are connected to the MBR membrane tank 4 through dosing pipes.

[0048] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions and substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A domestic sewage treatment device, characterized in that, The system includes a water treatment tank, a mixed liquor return mechanism, a sludge return mechanism, an ultraviolet sterilizer (7), and a controller. The water treatment tank is divided into an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), an MBR membrane tank (4), a clear water tank (5), and an equipment room (6) by a partition A. Domestic sewage passes through the anaerobic tank (1), anoxic tank (2), aerobic tank (3), MBR membrane tank (4), and clear water tank (5) in sequence. The outlets of the anaerobic tank (1), the anoxic tank (2), and the aerobic tank (3) are all equipped with sludge-water separation mechanisms (8). The aerobic tank (3) is divided into multiple interconnected areas (31) by a partition B. Each area (31) is equipped with an aeration disc (32), an aeration pipe (33) equipped with a ball valve (10), and a DO detector. One end of the aeration pipe (33) is connected to the corresponding aeration disc (32), and the other end of the aeration pipe (33) is connected to aeration pipe A (35). Aeration pipe A (35) is connected to a blower (9). A check valve (11) and a ball valve (10) are installed on aeration pipe A (35). The MBR membrane tank is equipped with a perforated aeration pipe (41). The perforated aeration pipe (41) is connected to the blower (9) through an aeration pipe B (42) equipped with a check valve (11) and a ball valve (10). The mixed liquor reflux mechanism includes a mixed liquor reflux pipe (21). The mixture return pump (34) is installed in the aerobic tank. One end of the mixture return pipe (21) is connected to the mixture return pump (34), and the other end of the mixture return pipe (21) is connected to the anoxic tank (2). The sludge return mechanism includes a sludge return pipe (45) and a sludge return pump (44) installed in the MBR membrane tank (4). One end of the sludge return pipe (45) is connected to the sludge return pump (44) through a ball valve (10), and the other end of the sludge return pipe (45) is connected to a tee. The other two ends of the tee are connected to the anaerobic tank (1) and the sludge discharge pipe (46) respectively. A ball valve (10) is installed on the sludge discharge pipe (46). The clear water tank ( 5) The backwash pump (51) is connected to the self-priming pump (52) through a pipe. The self-priming pump (52) is connected to the ultraviolet sterilizer (7). The outlet of the ultraviolet sterilizer (7) is connected to the clear water tank (5) through a pipe equipped with a rotor flow meter (71). The blower (9), the self-priming pump (52), the ultraviolet sterilizer (7) and the controller are all arranged in the equipment room. Each ball valve (10), each check valve (11), blower (9), self-priming pump (52), ultraviolet sterilizer (7), sludge return pump (44), mixed liquor return pump (34), rotor flow meter (71), backwash pump (51) and each DO detector are electrically connected to the controller.

2. The domestic sewage treatment device according to claim 1, characterized in that, The outlet of the anaerobic tank (1) is connected to the anoxic tank (2) through a pipe, the outlet of the anoxic tank (2) is connected to the aerobic tank (3) through a pipe, and the aerobic tank (3) and the MBR membrane tank (4) are connected through a water outlet, which is the outlet of the aerobic tank (3).

3. A domestic sewage treatment device according to claim 2, characterized in that, The MBR membrane tank (4) is equipped with a suction pump, which is connected to the clear water tank (5) and electrically connected to the controller.

4. A domestic sewage treatment device according to claim 3, characterized in that, The anaerobic tank (1) is equipped with an inlet pipe (12), one end of which extends from the upper part of the anaerobic tank (1) to the lower part of the anaerobic tank (1).

5. A domestic sewage treatment device according to claim 4, characterized in that, The inner cavity of the mud-water separation mechanism (8) is provided with a cavity A, and a sludge return port (81) is provided at the bottom of the cavity A. The inner cavity of the cavity A is divided into two cavities B with the bottom connected by a partition C (82). The cavity of the mud-water separation mechanism (8) is surrounded by a perforated plate.

6. A domestic sewage treatment device according to claim 5, characterized in that, The sludge discharge pipe (46) extends to the sludge pond.

7. A domestic sewage treatment device according to claim 6, characterized in that, The MBR membrane tank (4) is equipped with an MBR membrane module (43), an acid washing dosing device (53), and a sodium hypochlorite dosing device (54). The acid washing dosing device (53) and the sodium hypochlorite dosing device (54) are both arranged in the equipment room (6). The acid washing dosing device (53) and the sodium hypochlorite dosing device (54) are both electrically connected to the controller. The acid washing dosing device (53) and the sodium hypochlorite dosing device (54) are both connected to the MBR membrane tank (4) through dosing pipes.

8. A domestic sewage treatment device according to claim 7, characterized in that, The clear water tank (5) is equipped with a water outlet pipe (55).

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