Rural sewage integrated treatment equipment

Abstract

The utility model discloses integrated rural sewage treatment equipment, which is characterized in that the interior of a box body is divided into an upper layer box body and a lower layer box body by partition plates, the upper layer is a constructed wetland, and the lower layer is divided into an aerobic tank, an anaerobic tank, an anoxic tank, a sedimentation tank and a clean water tank by a plurality of partition plates; the anoxic tank and the aerobic tank, the aerobic tank and the sedimentation tank, and the sedimentation tank and the clean water tank are communicated through communicating pipes, a first gas stripping device and an aeration device are arranged in the aerobic tank, a pipeline outlet of the first gas stripping device is communicated with the anoxic tank, a second gas stripping device is arranged in the sedimentation tank, and a pipeline outlet of the second gas stripping device is communicated with the anaerobic tank. A third gas stripping device is arranged in the clean water tank, a pipeline outlet of the third gas stripping device is communicated with the constructed wetland, a water inlet is formed in the anaerobic tank, and a water outlet is formed in the constructed wetland. The equipment achieves the nitrogen and phosphorus removal effects through ammoniation, denitrification, nitrification, precipitation, plant absorption and the like, and can better solve the problem of difficulty in rural sewage treatment.

Description

Technical Field

[0001] The utility model relates to integrated rural sewage treatment equipment, belonging to the technical field of sewage treatment equipment. Background Art

[0002] Rural domestic sewage mainly includes water used in the kitchen, toilet, bathroom, and daily washing. Through field investigations, it was found that currently rural domestic sewage is mainly discharged into septic tanks. After treatment in the septic tanks, it is collected to the sewage treatment plant through pipelines. However, there are also some cases where they are not connected to the pipeline network or there are problems with the pipeline network. This is mainly because rural residents live in scattered areas and it is difficult to collect sewage in a comprehensive manner. A large amount of sewage is directly discharged into natural water bodies after only simple treatment, causing water pollution, damaging the rural ecological environment, and affecting the rural living environment and residents' health. Utility Model Content

[0003] The purpose of this utility model is to provide an integrated rural sewage treatment device. The device integrates an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a clear water tank, and a micro-constructed wetland. Through ammoniation, denitrification, nitrification, sedimentation, and plant absorption, it achieves nitrogen and phosphorus removal, effectively solving the problem of difficult rural sewage treatment.

[0004] The technical solution of the utility model is as follows: an integrated rural sewage treatment device comprises a box body, the interior of the box body is divided into an upper and lower box body by a partition, wherein the upper box body forms an artificial wetland, and the lower box body is divided into an aerobic tank in the middle, an anaerobic tank and an anoxic tank on the left, and a sedimentation tank and a clear water tank on the right by multiple partitions, there is a gap between the bottom of the partition between the anaerobic tank and the anoxic tank and the bottom surface of the box body, the anoxic tank and the aerobic tank, the aerobic tank and the sedimentation tank, and the sedimentation tank and the clear water tank are connected via a connecting pipe, a first air stripping device and an aeration device are provided in the aerobic tank, a pipeline outlet of the first air stripping device is connected to the anoxic tank, a second air stripping device is provided in the sedimentation tank, a pipeline outlet of the second air stripping device is connected to the anaerobic tank, a third air stripping device is provided in the clear water tank, a pipeline outlet of the third air stripping device is connected to the artificial wetland, a water inlet is provided on the anaerobic tank, and a water outlet is provided on the artificial wetland.

[0005] In the aforementioned integrated rural sewage treatment equipment, the air sources of the first air stripping device, the second air stripping device, the third air stripping device and the aeration device are all a common blower, and the blower is connected to the first air stripping device, the second air stripping device, the third air stripping device and the aeration device respectively through a five-way joint and a pipeline.

[0006] In the aforementioned integrated rural sewage treatment equipment, the artificial wetland is provided with a protrusion on each of the left and right sides, and the top of the protrusion is an opening structure. Below the opening of the left protrusion are an anaerobic tank, an anoxic tank and an aerobic tank; below the opening of the right protrusion are an aerobic tank, a sedimentation tank and a clear water tank.

[0007] In the aforementioned integrated rural sewage treatment equipment, each of the first gas lift device, the second gas lift device, the third gas lift device and the aeration device is provided with a valve, and the four valves are located below the raised opening on the right side.

[0008] In the aforementioned integrated rural sewage treatment equipment, a cover is provided at the raised opening.

[0009] In the aforementioned integrated rural sewage treatment equipment, the aerobic pool is filled with suspended ball biological fillers, and a barrier net is provided on the top of the aerobic pool.

[0010] In the aforementioned integrated rural sewage treatment equipment, a pretreatment tank is provided outside the anaerobic tank and the anoxic tank, a water inlet pipe is provided on the pretreatment tank, and the pretreatment tank is connected to the anaerobic tank through the water inlet.

[0011] The beneficial effects of the present invention are as follows: compared with the existing technology, the integrated rural sewage treatment equipment of the present invention integrates an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a clear water tank and an artificial wetland into one, wherein the anaerobic tank can achieve the effects of ammonia and phosphorus release; the anoxic tank achieves the purpose of system denitrification; the aerobic tank mainly performs nitrification reaction and phosphorus accumulation and removal; the sedimentation tank is used to precipitate sludge and impurities in the sewage after treatment in the aerobic tank; the clear water tank further precipitates the treated water; the artificial wetland further absorbs and utilizes nitrogen and phosphorus in the water through aquatic plants, and can also play a role in aesthetics. The equipment has the characteristics of compact structure, simplicity and low production cost. A blower is used to simultaneously realize aeration, mixed liquid and sludge return and drainage functions, reducing equipment costs. The equipment is simple to operate and maintain, the equipment cost is low, and the operation and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the top view of the structure of the utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the structure without the upper box;

[0014] Figure 3 for Figure 1 A--A-direction structural diagram;

[0015] Figure 4 This is a schematic diagram of the structure of the utility model after a pretreatment tank is added.

[0016] Figure numerals: 1-water inlet, 2-anaerobic tank, 3-anoxic tank, 4-aerobic tank, 5-sedimentation tank, 6-clear water tank, 7-blower, 8-first air stripping device, 9-third air stripping device, 10-second air stripping device, 11-aeration device, 12-artificial wetland, 13-water outlet, 14-box, 15-protrusion, 16-cover, 17-suspended ball biological filler, 18-connecting pipe, 19-valve, 20-barrier net, 21-pretreatment tank, 22-water inlet pipe. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] The embodiment of the present utility model is an integrated rural sewage treatment device, comprising a box 14 with a top opening, the interior of the box 14 is divided into an upper and lower box by a horizontal partition, the upper and lower boxes form an independent space, wherein the upper box forms an artificial wetland 12, the lower box is divided into three chambers of left, middle and right by two longitudinal partitions set at intervals, the middle chamber forms an aerobic tank 4, the left and right chambers are each divided into front and rear chambers by a vertical partition, wherein the left front chamber is an anaerobic tank 2, the left rear chamber is an anoxic tank 3, the right front chamber is a sedimentation tank 5, and the right rear chamber is a clear water tank 6, the bottom of the vertical partition between the anaerobic tank 2 and the anoxic tank 3 is connected to the bottom surface of the box 14 There is a distance between the anaerobic tank 2 and the anoxic tank 3, which forms a connecting structure. The anoxic tank 3 and the aerobic tank 4, the aerobic tank 4 and the sedimentation tank 5, and the sedimentation tank 5 and the clear water tank 6 are connected via a connecting pipe 18. The aerobic tank 4 is provided with a first air stripping device 8 and an aeration device 11. The pipeline outlet of the first air stripping device 8 is connected to the anoxic tank 3. The sedimentation tank 5 is provided with a second air stripping device 10. The pipeline outlet of the second air stripping device 10 is connected to the anaerobic tank 2. The clear water tank 6 is provided with a third air stripping device 9. The pipeline outlet of the third air stripping device 9 is connected to the artificial wetland 12. The anaerobic tank 2 is provided with a water inlet 1, and the artificial wetland 12 is provided with a water outlet 13.

[0019] During use, domestic sewage is first pre-treated in the septic tank and then connected to the anaerobic tank 2 through the pipeline through the water inlet 1, and is mixed with the sludge in the sedimentation tank 5 and returned to the anaerobic tank 2 through the second air stripping device 10 to undergo ammonia and phosphorus release processes; the sewage treated in the anaerobic tank 2 flows into the anoxic tank 3 by gravity, and is mixed with the nitrified liquid in the aerobic tank 4 and returned to the anoxic tank 3 through the first air stripping device 8 to remove nitrogen through denitrification reaction; the sewage treated in the anoxic tank 3 flows by gravity into the aerobic tank 4 through the connecting pipe 18. The aerobic tank 4 is equipped with an aeration device 11 and a first air stripping device 8. The main function of the aeration device 11 is to provide oxygen to the water body and promote the circulation of the water body. The first air stripping device 8 is used to return the nitrified liquid in the aerobic tank 4 to the anoxic tank 3, where nitrification reaction occurs, providing a nitrogen source for denitrification, and achieving phosphorus removal through polyphosphate precipitation. The sewage treated in the aerobic tank 4 flows into the sedimentation tank 5 through the connecting pipe 18 under the action of gravity. The sedimentation tank 5 is equipped with a second air stripping device 10 for returning the sludge to the anaerobic tank 2. The water after sedimentation in the sedimentation tank 5 flows into the clear water tank 6 through the connecting pipe 18 by gravity. The water in the clear water tank 6 is air-lifted by the third air stripping device 9 and flows into the uppermost artificial wetland 12. After being absorbed by the aquatic plants in the artificial wetland 12, it is discharged from the outlet 13.

[0020] The specific reaction process of each part is as follows:

[0021] 1) Anaerobic tank 2: The tank contains a mixture of sewage and return sludge from sedimentation tank 5, which mainly achieves the effects of ammonia and phosphorus release. Nitrogen-containing organic matter is decomposed into ammonia nitrogen by aerobic, anaerobic and heterotrophic microorganisms, and phosphorus in the return sludge is released by phosphorus-accumulating bacteria.

[0022] 2) Anoxic tank 3: The sewage treated in the anaerobic tank 2 is mixed with the nitrification liquid returned from the aerobic tank 3. The nitrate nitrogen and nitrite nitrogen in the sewage are reduced to nitrogen gas by denitrifying bacteria under anoxic (anaerobic) conditions, thereby achieving the purpose of denitrification of the system.

[0023] 3) Aerobic pool 4: It mainly carries out nitrification reaction and phosphorus accumulation and removal. Ammonia in sewage is converted into nitrate nitrogen under aerobic conditions. The excessive phosphorus taken up by phosphorus accumulation bacteria is precipitated into the sludge to achieve phosphorus removal effect.

[0024] 4) Sedimentation tank 5: Sediments the sludge and impurities in the sewage after treatment in the aerobic tank 4, and returns the sludge through the second air stripping device 10 to replenish the sludge in the anaerobic tank 2.

[0025] 5) Clear water tank 6: further sedimentation treatment water, according to the water quality conditions, appropriate chemicals can be added to treat pollutants in the water.

[0026] 6) Artificial wetland 12: Aquatic plants can further absorb and utilize nitrogen and phosphorus in water, and also play an aesthetic role.

[0027] The air source for the first, second, third, and aeration devices 8, 10, 9, and 11 is a common blower 7, which is connected to each of these devices via a five-way joint and pipes. This single blower 7 provides the required air source for each of these devices, eliminating the need for multiple air source devices. The water pipes used in this utility model for nitrification liquid return, sludge return, and clear water tank drainage using air stripping are all 50mm PVC pipes, and the air supply pipe is a 20mm PVC pipe.

[0028] The artificial wetland 12 is provided with a protrusion 15 on each of its left and right sides. The top of each protrusion 15 is an opening. Below the opening of the left protrusion 15 are the anaerobic tank 2, the anoxic tank 3, and the aerobic tank 4; below the opening of the right protrusion 15 are the aerobic tank 4, the sedimentation tank 5, and the clear water tank 6. The two protrusions 15 allow for easy observation of the conditions in each area through the openings at the top of the protrusions 15. When equipment problems occur, it is also convenient to identify the area with the problem and to perform maintenance on the internal equipment through the openings.

[0029] Each of the first, second, and third air stripping devices 8, 10, 9, and aeration device 11 is equipped with a valve 19, which allows adjustment of the air intake of each device. The four valves 19 are located below the opening of the right protrusion 15. Adjustment of the air intake is accomplished by inserting a hand through the opening into the valve 19, resulting in a well-organized layout and convenient adjustment.

[0030] The opening of the protrusion 15 is provided with a cover 16 to prevent the odor in the sewage treatment process from being discharged and polluting the environment. When it is necessary to observe the inside of the device, the cover 16 can be opened.

[0031] The aerobic tank 4 is filled with suspended spherical biofiller 17, topped with a barrier net 20. Currently, suspended spherical biofiller 17 is widely used in sewage treatment. Its overall density is close to that of water, allowing it to remain suspended in sewage without requiring a fixed support, allowing the sewage to flow evenly into contact with the filler. The present invention utilizes suspended spherical biofiller 17 with a filling ratio of 50%. The suspended spherical biofiller 17 consists of a polyurethane spherical outer shell and an inner polyurethane sponge block.

[0032] A pretreatment tank 21 is provided outside the anaerobic tank 2 and the anoxic tank 3. A water inlet pipe 22 is provided on the pretreatment tank 21, and the pretreatment tank 21 is connected to the anaerobic tank 2 through the water inlet 1. First, domestic sewage is pretreated in the septic tank and then pumped or gravity-flows into the pretreatment tank 21 through the water inlet 22. The sewage undergoes a primary sedimentation in the pretreatment tank 21, and after the sedimentation of impurities, the sewage enters the anaerobic tank 2 through the water inlet 1 for treatment.

[0033] In the integrated rural sewage treatment equipment of the present invention, the anaerobic tank 2 is designed with an effective water depth of 0.9m and a designed overheight of 0.1m, so the total height of the anaerobic tank 2 is 1m. The designed length and width are 0.28m and 0.2m respectively. Treated sewage can flow into the anaerobic tank 2 by gravity, or it can be pumped by a water pump, with the water flow rate controlled by the water pump valve. The water pump is a mechanical electromagnetic diaphragm metering pump, model GM 0-90L / min, 0.8Mpa. The anaerobic tank 2 is adjacent to the anoxic tank 3, and a rectangular gap 0.28m long and 0.2m high is set at the bottom of the two to connect them.

[0034] The anoxic tank 3 is designed to have an effective water depth of 0.9m, an overhang of 0.1m, and a total height of 1m. Its length and width are 0.28m and 0.3m, respectively. The bottom of the anoxic tank 3 is connected to the anaerobic tank 2, eliminating the need for an inlet pipe. A connecting pipe 18 with a designed diameter of 50mm drains from the anoxic tank 3 to the aerobic tank 4. One end of the connecting pipe 18 is located approximately 20cm from the bottom of the anoxic tank 2, and the other end extends to a longitudinal partition 16 approximately 90cm from the bottom, where it connects to the aerobic tank 4.

[0035] The aerobic pool 4 is designed to have an effective water depth of 0.9m, an overhang of 0.1m, and a total height of 1m. Its length and width are 0.39m and 0.5m, respectively. Water is supplied from the aerobic pool 4 via the anoxic pool 3. Water is discharged from the aerobic pool 4 to the sedimentation pool 5 via a connecting pipe 18.

[0036] Sedimentation tank 5 primarily precipitates the mixed liquor treated in aerobic tank 4, separating the liquid from the sludge. The separated upper layer of liquid flows by gravity from the upper layer of sedimentation tank 5 through a horizontal flow connecting pipe 18 into the clear water tank 6. The sludge is then stripped back to the anaerobic tank 2 by air stripping through a second air stripping device 10. Sedimentation tank 5 is designed to be 0.2m long and 0.25m wide, with an effective water depth of 0.85m and an overhang of 0.15m.

[0037] The clear water tank 6 is used to store the water treated by sedimentation. Its design dimensions are 0.2m in length and 0.25m in width, with an effective water depth of 0.85m and a designed effective volume of 0.042m. 3 The clean water tank 6 is sent to the artificial wetland 12 on the uppermost layer of the equipment by air stripping through the third air stripping device 9, and the air stripping height is about 0.3m.

[0038] A U-shaped surface flow artificial wetland 12 is set on the top of the integrated sewage treatment equipment, with an effective height of 0.2m, a total length of about 0.9m, and a total width of about 0.5m. Two rectangular observation ports (i.e., protrusions 20) are set in the middle, with a length and width of 0.2m and 0.3m respectively. Therefore, the volume of the artificial wetland is about 0.06m 3 The diameter of the outlet 13 of the artificial wetland 12 is 25 mm. The purification plant of the surface flow artificial wetland 12 is selected as foxtail algae, and fine sand is selected as the filling material with a filling thickness of about 50 mm.

[0039] The utility model realizes aeration, mixed liquid return, sludge return and drainage through the blower 7. The required air volume is the sum of the air volume required for each function. The Roots blower HG-370 can be selected, with a power of 370W, a maximum wind pressure of 12kPa, and a maximum air volume of 54m 3 / h.

[0040] The main body of the integrated equipment of the present utility model is made of PPR material. The incoming water first enters the anaerobic tank 2, flows into the anoxic tank 3 from the bottom of the anaerobic tank 2, and flows into the aerobic tank 4 from the anoxic tank 3 through the connecting pipe 18. After being treated in the aerobic tank 4, it flows into the sedimentation tank 5 from the top circular hole through the horizontal connecting pipe 18. The precipitated water flows from the top through the horizontal connecting pipe 18 into the clean water tank 6, and then is discharged to the artificial wetland 12 at the top through the third air stripping device 9, and finally discharged to the outside of the equipment. The aerobic tank 4 is provided with an aeration device 11 and a first air stripping device 8 to achieve aeration and nitrification liquid reflux, and the sedimentation tank 5 is provided with a second air stripping device 10 to achieve sludge reflux. The entire equipment realizes the nitrification liquid, sludge reflux and the drainage of the clean water tank through air stripping. Therefore, when gravity water is used, the equipment only needs one blower 7 to operate, and no reflux pump is required.

[0041] The integrated rural sewage treatment equipment of the present invention is mainly composed of a main reactor and auxiliary equipment. Since the volume of the main reactor (i.e., the box 14) is 0.5m 3 About 0.6m3 of sewage is treated daily 3 The reactor does not require high material strength, but it must have a certain degree of corrosion resistance. It can be made of a variety of materials such as polyethylene, PPR, PE, PVC, fiberglass, stainless steel, etc., and the cost can be controlled at around 2,000 yuan. Other ancillary facilities mainly include pipes, biological fillers and blowers 7. In actual application, sewage can flow into the equipment by gravity without the use of a water pump. The equipment production and construction cost is about 2,800 yuan. Compared with traditional concrete construction, on the one hand, it can reduce land costs and make equipment replacement and maintenance more convenient; on the other hand, it can reduce construction costs and construction period.

[0042] Because this equipment uses air lift to achieve internal and external recirculation, drainage, and aeration, its primary operating cost is the electricity consumed by blower 7. Operating 24 hours a day, blower 7 consumes approximately 0.72 kW of electricity, which, at 0.6 kW / kW, translates to approximately 0.43 ¥ / day. This relatively low operating cost makes it suitable for decentralized rural domestic sewage treatment.

[0043] This utility model addresses the wide distribution of dispersed rural domestic sewage, the lack of sewage collection network infrastructure, the small daily household sewage discharge volume, and the stable pollutants. Combining the AAO process with the artificial wetland process, this design and manufactures a small, integrated sewage treatment device. This device integrates an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a sedimentation tank 5, a clear water tank 6, and an artificial wetland 12. It achieves nitrogen and phosphorus removal through ammoniation, denitrification, nitrification, sedimentation, and plant absorption. This device was used to verify the sewage treatment effect on site, and the equipment operating parameters were optimized. The main conclusions are as follows:

[0044] 1) Integrated sewage treatment equipment has the advantages of small footprint, simple structure, and low operation and maintenance costs, providing a new equipment option for rural domestic sewage treatment.

[0045] 2) When the hydraulic retention time was 18 hours and the nitrification solution recirculation ratio was 200%, the removal efficiency of COD, ammonia nitrogen, total nitrogen, and total phosphorus in the wastewater was the best, with removal rates of 83.7%, 87.3%, 76.6%, and 71.4%, respectively. After treatment, all pollutants in the wastewater met the secondary discharge standard of DB43 / 1665-2019.

Claims

1. An integrated rural sewage treatment device, characterized by: The invention comprises a box (14), wherein the interior of the box (14) is divided into an upper and lower box by a partition, wherein the upper box forms an artificial wetland (12), and the lower box is divided into an aerobic pool (4) in the middle, an anaerobic pool (2) and an anoxic pool (3) on the left, and a sedimentation pool (5) and a clear water pool (6) on the right by a plurality of partitions. There is a gap between the bottom of the partition between the anaerobic pool (2) and the anoxic pool (3) and the bottom surface of the box (14). There are connecting pipes between the anoxic pool (3) and the aerobic pool (4), between the aerobic pool (4) and the sedimentation pool (5), and between the sedimentation pool (5) and the clear water pool (6). (18) are connected, a first air stripping device (8) and an aeration device (11) are provided in the aerobic tank (4), the pipeline outlet of the first air stripping device (8) is connected to the anoxic tank (3), a second air stripping device (10) is provided in the sedimentation tank (5), the pipeline outlet of the second air stripping device (10) is connected to the anaerobic tank (2), a third air stripping device (9) is provided in the clear water tank (6), the pipeline outlet of the third air stripping device (9) is connected to the artificial wetland (12), a water inlet (1) is provided on the anaerobic tank (2), and a water outlet (13) is provided on the artificial wetland (12).

2. The integrated rural sewage treatment equipment according to claim 1, characterized in that: The air sources of the first air stripping device (8), the second air stripping device (10), the third air stripping device (9) and the aeration device (11) are all a common blower (7), and the blower (7) is connected to the first air stripping device (8), the second air stripping device (10), the third air stripping device (9) and the aeration device (11) respectively via a five-way joint and a pipeline.

3. The integrated rural sewage treatment equipment according to claim 1, characterized in that: The artificial wetland (12) is provided with a protrusion (15) on the left and right sides respectively. The top of the protrusion (15) is an open structure. Below the opening of the left protrusion (15) are an anaerobic tank (2), an anoxic tank (3) and an aerobic tank (4); below the opening of the right protrusion (15) are an aerobic tank (4), a sedimentation tank (5) and a clear water tank (6).

4. The integrated rural sewage treatment equipment according to claim 3, characterized in that: The first air stripping device (8), the second air stripping device (10), the third air stripping device (9) and the aeration device (11) are each provided with a valve (19), and the four valves (19) are located below the opening of the right protrusion (15).

5. The integrated rural sewage treatment equipment according to claim 3, characterized in that: A cover (16) is provided at the opening of the protrusion (15).

6. The integrated rural sewage treatment equipment according to claim 1, characterized in that: The aerobic pool (4) is filled with suspended ball biological filler (17), and a barrier net (20) is provided on the top of the aerobic pool (4).

7. The integrated rural sewage treatment equipment according to claim 1, characterized in that: A pretreatment tank (21) is provided outside the anaerobic tank (2) and the anoxic tank (3). A water inlet pipe (22) is provided on the pretreatment tank (21). The pretreatment tank (21) is connected to the anaerobic tank (2) through the water inlet (1).

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