A device for treating rural domestic sewage

Abstract

The utility model discloses a kind of equipment for rural domestic sewage treatment, including processing jar body, the inside of processing jar body is separated by baffle and has anaerobic pool, anoxic pool, aerobic pool and clear water pool, gas lift digestion liquid return pipe is provided on processing jar body, the inside of aerobic pool is provided with rotary mixing aerator, electrolytic phosphorus removal module is installed in the position of processing jar body and corresponding anaerobic pool.The utility model adopts PP material jar body, and environmental protection is good;Integrated electrolytic phosphorus removal module, maintenance cycle is long, and reagent supplement is less;Three kinds of packing combinations are used for different reaction zones, improve microbial load and processing effect;Design packing filter area, reduce strain loss, improve effluent quality;Reflux pipeline uses gas lift design, adapt to small flow low-lift working condition, simplify system and improve reflux efficiency;Effluent uses gas lift design, improve liquid level, effluent is uniform, prevent flood period strain loss, meet the demand of rural domestic sewage treatment in all directions.

Description

Technical Field

[0001] This utility model relates to the field of domestic sewage treatment technology, specifically to a device for treating rural domestic sewage. Background Technology

[0002] Currently, rural domestic sewage treatment faces numerous challenges, with biological contact oxidation being the mainstream treatment process. This process, a biofilm treatment method situated between activated sludge and biofilters, degrades pollutants through a biofilm attached to the surface of the packing material. It boasts high efficiency and ease of operation, making it particularly suitable for decentralized sewage treatment scenarios in rural areas.

[0003] In the biological contact oxidation process, the aeration system plays a crucial role, providing dissolved oxygen to microorganisms so that they can decompose organic matter (such as COD and BOD) in wastewater under aerobic conditions, generating CO2 and water. Wastewater, packing materials, and oxygen come into full contact within the tank. The biofilm on the packing materials (such as suspended packing materials) can adsorb and degrade pollutants, while suspended sludge also participates in the treatment process.

[0004] This process has several significant advantages: First, it has strong resistance to shock loads and can adapt well to the large fluctuations in the quality of rural sewage, making it suitable for situations where water volume changes frequently in rural areas; second, it produces low sludge, significantly reducing the amount of residual sludge compared to the activated sludge process.

[0005] However, existing technical solutions also have some drawbacks that cannot be ignored. On the one hand, integrated equipment is mostly made of fiberglass, which has certain negative impacts on the environment during production, use, and waste disposal, and is not environmentally friendly. On the other hand, the biofilm is easily lost during the treatment process, which leads to a reduction in the amount of microorganisms in the treatment system, thereby affecting the quality of the effluent and making it difficult for the treated wastewater to consistently meet the ideal discharge standards. Utility Model Content

[0006] The purpose of this invention is to provide a device for treating rural domestic sewage, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a device for treating rural domestic sewage, comprising a treatment tank, wherein the interior of the treatment tank is divided into an anaerobic tank, an anoxic tank, an aerobic tank, and a clear water tank by a partition; an air-lift digester return pipe is provided on the treatment tank; a vortex aerator is provided inside the aerobic tank; an electrolytic phosphorus removal module is installed on the treatment tank and at a position corresponding to the anaerobic tank; the electrolytic phosphorus removal module is interconnected with the anoxic tank and the aerobic tank through a connecting pipe, and the connecting pipe is provided with perforated aeration.

[0008] Optionally, the bottom of the processing tank is provided with a tank support for supporting the processing tank.

[0009] Optionally, a flow guide plate is installed between the anaerobic tank and the anoxic tank, corresponding to the position of the electrolytic phosphorus removal module.

[0010] Optionally, a filtration zone is provided between the aerobic tank and the clear water tank, and an air-lift backwash return pipe, an air-wash pipe, an air-lift sludge return pipe, and an air-lift water outlet pipe are provided on the treatment tank at positions corresponding to the filtration zone.

[0011] Optionally, an inlet is installed on one side of the treatment tank, and an outlet is installed on the other side of the treatment tank.

[0012] Optionally, a disinfection tank is installed on the treatment tank at the position corresponding to the water outlet.

[0013] Optionally, the top of the processing tank is also provided with several maintenance inlets.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model provides a device for rural domestic sewage treatment, which uses a PP material tank, making it environmentally friendly; it integrates an electrolytic phosphorus removal module, resulting in long maintenance cycles and less reagent replenishment; it uses three types of packing materials in different reaction zones to increase microbial load and treatment effect; it is designed with a packing filtration zone to reduce bacterial loss and improve effluent quality; the return pipeline adopts an air-lift design to adapt to low flow and low head conditions, simplifying the system and improving return efficiency; the effluent adopts an air-lift design to increase liquid level, ensure uniform effluent, prevent bacterial loss during the flood season, and comprehensively meet the needs of rural domestic sewage treatment.

[0016] 2. Enhanced Environmental Friendliness: Using PP material to make the tank body successfully solves the problem of the environmental unfriendliness of traditional fiberglass materials. PP material has excellent environmental performance, with minimal negative impact on the environment during production, use, and disposal, meeting current environmental requirements and contributing to sustainable development.

[0017] 3. Optimized Phosphorus Removal Method: An integrated electrolytic phosphorus removal module replaces the traditional chemical phosphorus removal method. Traditional chemical phosphorus removal requires frequent reagent replenishment, increasing operating costs and manpower. In contrast, the electrolytic phosphorus removal module of this invention has a maintenance cycle of up to six months, significantly reducing maintenance workload and reagent consumption, lowering operating costs, and improving the stability of phosphorus removal performance.

[0018] 4. Enhanced Packing Material Combination: Three different packing materials—19-pore PE packing, polyurethane packing, and modified polyurethane packing—were used in the anaerobic, anoxic, and aerobic reaction zones. This combination of materials fully leverages their respective advantages, increasing the microbial load in each reaction zone. More microorganisms mean stronger pollutant degradation capabilities, significantly improving wastewater treatment efficiency and enabling more effective reduction of various pollutant indicators in the wastewater.

[0019] 5. Reduced bacterial loss: The design incorporates a packing filter zone, which filters the treated wastewater through the filter media. The filter media can intercept some bacteria, reducing the loss of bacteria with the effluent. This not only ensures the stability of the microbial population in the treatment system and maintains good treatment results, but also further improves the effluent quality, enabling the treated wastewater to more consistently meet discharge standards.

[0020] 6. Innovative Return Piping: All return pipelines utilize an air-lift design, highly suitable for the low-flow, low-head conditions of rural domestic wastewater treatment. A single main air pipe is sufficient to meet the return requirements of all pipelines, including nitrification liquor return, sludge return, backwash return, and air-lifted effluent. The air-lift design simplifies the piping system, reduces equipment complexity and cost, while simultaneously improving return efficiency and ensuring stable operation of the treatment system.

[0021] 7. Improved Effluent Design: The effluent system adopts an air-lift design, replacing the traditional gravity-flow method. Air-lift design increases the effluent level, resulting in more uniform effluent flow and effectively preventing the loss of microbial inoculum due to flooding. This ensures the stability of the treatment system and the reliability of the effluent quality even under conditions of significant water volume fluctuations, such as during flood season. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the equipment for rural domestic sewage treatment according to this utility model.

[0023] In the picture:

[0024] 1. Treatment tank; 2. Inlet; 3. Electrolytic phosphorus removal module; 4. Anaerobic tank; 5. Baffle plate; 6. Tank support; 7. Perforated aeration; 8. Anoxic tank; 9. Aerobic tank; 10. Swirl aerator; 11. Air-lift digester return pipe; 12. Filtration zone; 13. Air-lift backwash return pipe; 14. Air-wash pipe; 15. Air-lift sludge return pipe; 16. Air-lift effluent pipe; 17. Disinfection tank; 18. Inspection inlet; 19. Outlet; 20. Clear water tank. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1 A device for treating rural domestic sewage includes a treatment tank 1 made of PP material, which is more environmentally friendly than traditional fiberglass. PP material has less environmental impact during production, use, and waste disposal, effectively solving the environmental problems associated with traditional fiberglass. The interior of the treatment tank 1 is rationally divided by partitions into an anaerobic tank 4, an anoxic tank 8, an aerobic tank 9, and a clear water tank 20. This partitioned design provides independent and suitable environments for different stages of sewage treatment. The treatment tank 1 is equipped with an air-lift digester return pipe 11. The aerobic tank 9 is equipped with a vortex aerator 10, which can evenly supply oxygen to the aerobic tank 9, providing favorable living conditions for aerobic microorganisms and promoting their decomposition of organic matter. An electrolytic phosphorus removal module 3 is installed on the treatment tank 1, corresponding to the anaerobic tank 4. The electrolytic phosphorus removal module 3 is interconnected with the anoxic tank 8 and the aerobic tank 9 via connecting pipes, and the connecting pipes are equipped with perforated aeration devices 7. The electrolytic phosphorus removal module 3 replaces the traditional chemical phosphorus removal method, with a maintenance cycle of up to six months. It eliminates the need for frequent reagent replenishment, reducing operating costs and manpower input, while improving the stability of phosphorus removal effect.

[0027] To stably support the processing tank 1 and ensure the stability of the equipment during operation, a tank support 6 is provided at the bottom of the processing tank 1 in this embodiment. The tank support 6 can evenly distribute the weight of the processing tank 1, preventing the processing tank 1 from tilting or being damaged due to vibrations generated during equipment operation, thus ensuring the long-term stable operation of the equipment.

[0028] To optimize the water flow between the anaerobic tank 4 and the anoxic tank 8, allowing wastewater to flow more smoothly between the two tanks and better utilize the electrolytic phosphorus removal module 3, a guide plate 5 is installed between the anaerobic tank 4 and the anoxic tank 8, corresponding to the position of the electrolytic phosphorus removal module 3. The guide plate 5 guides the wastewater to flow along a preset path, increasing the contact time and area between the wastewater and the electrolytic phosphorus removal module 3, thereby improving phosphorus removal efficiency.

[0029] To further improve effluent quality and reduce bacterial loss, a filtration zone 12 is provided between the aerobic tank 9 and the clear water tank 20 in this embodiment. The filtration zone 12 filters the aerobically treated wastewater through filter media, intercepting some bacteria and suspended solids to ensure the stability of the microbial population in the treatment system and maintain good treatment results. On the treatment tank 1, corresponding to the filtration zone 12, are installed an air-lift backwash return pipe 13, an air-wash pipe 14, an air-lift sludge return pipe 15, and an air-lift water extraction pipe 16. All return pipelines adopt an air-lift design, which is very suitable for the low-flow, low-head conditions of rural domestic wastewater treatment. Only one main air pipe is needed to meet the return requirements of all pipelines, including nitrification liquid return, sludge return, backwash return, and air-lift water extraction. The air-lift design simplifies the pipeline system, reduces equipment complexity and cost, while improving return efficiency and ensuring the stable operation of the treatment system.

[0030] To facilitate the entry and exit of wastewater, in this embodiment, an inlet 2 is installed on one side of the treatment tank 1, and an outlet 19 is installed on the other side. The positions of the inlet 2 and outlet 19 are reasonably set, facilitating connection with external pipelines, allowing wastewater to smoothly enter the equipment for treatment, and ensuring timely discharge of the treated water. The effluent uses an air-lift design, replacing the traditional gravity-flow method, increasing the effluent level, making the effluent more uniform, effectively preventing the loss of bacteria due to flooding during the rainy season, and ensuring the reliability of the effluent quality.

[0031] To further disinfect the treated water and ensure that the effluent meets higher hygiene standards, in this embodiment, a disinfection tank 17 is installed on the treatment tank 1 at the position corresponding to the water outlet 19. The disinfection tank 17 can disinfect the water to be discharged, kill bacteria and viruses in the water, and improve the safety of the effluent.

[0032] To facilitate equipment maintenance and repair, in this embodiment, the top of the processing tank 1 is provided with several maintenance entrances 18. Maintenance personnel can enter the processing tank 1 through the maintenance entrances 18 to inspect, repair, and replace various components, ensuring the normal operation of the equipment.

[0033] In operation: Rural domestic sewage enters the anaerobic tank 4 inside the treatment tank 1 through inlet 2. In the anaerobic tank 4, under anaerobic conditions, anaerobic microorganisms decompose large organic molecules in the sewage into smaller organic molecules. Subsequently, the sewage flows into the anoxic tank 8 through the baffle plate 5. In the anoxic environment, denitrifying bacteria use the organic matter in the sewage to reduce nitrates and nitrites to nitrogen gas, achieving the denitrification process. At the same time, the electrolytic phosphorus removal module 3 starts working, removing phosphorus from the sewage through electrolysis. The perforated aeration 7 provides a suitable gaseous environment for the electrolytic phosphorus removal process, promoting the reaction.

[0034] Next, the wastewater enters the aerobic tank 9, where the vortex aerator 10 evenly aerates the water, providing sufficient oxygen for the aerobic microorganisms. The aerobic microorganisms further decompose the organic matter in the wastewater, converting it into carbon dioxide and water. The airlift digester return pipe 11 returns the digester liquid from the aerobic tank 9 to the anaerobic tank 4, providing a carbon source for the anaerobic tank 4 and promoting the anaerobic reaction.

[0035] After aerobic treatment, the wastewater enters the filtration zone 12, where the filter media intercepts some bacteria and suspended solids, reducing bacterial loss. The air-lift backwash return pipe 13, air-wash pipe 14, and air-lift sludge return pipe 15 perform backwashing and sludge return functions as needed, ensuring the normal operation of the filtration zone 12. The air-lift water outlet pipe 16 lifts the treated water to near the outlet 19.

[0036] Before being discharged, the treated water first enters the disinfection tank 17 for disinfection to kill bacteria and viruses. Finally, the disinfected water is discharged from the equipment through the outlet 19, meeting the rural domestic sewage discharge standards. Maintenance personnel can perform regular maintenance and inspections on the equipment through the maintenance inlet 18 on the top of the treatment tank 1 to ensure the long-term stable operation of the equipment.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for treating rural domestic sewage, comprising a treatment tank (1), characterized in that: The interior of the treatment tank (1) is divided into an anaerobic tank (4), an anoxic tank (8), an aerobic tank (9) and a clear water tank (20) by a partition. The treatment tank (1) is equipped with an air-lift digestion liquid return pipe (11). The interior of the aerobic tank (9) is equipped with a vortex aerator (10). An electrolytic phosphorus removal module (3) is installed on the treatment tank (1) at a position corresponding to the anaerobic tank (4). The electrolytic phosphorus removal module (3) is connected to the anoxic tank (8) and the aerobic tank (9) through a connecting pipe, and a perforated aeration (7) is provided on the connecting pipe.

2. The equipment for rural domestic sewage treatment according to claim 1, characterized in that: The bottom of the processing tank (1) is provided with a tank support (6) for supporting the processing tank (1).

3. The equipment for rural domestic sewage treatment according to claim 2, characterized in that: A guide plate (5) is installed between the anaerobic tank (4) and the anoxic tank (8), corresponding to the position of the electrolytic phosphorus removal module (3).

4. The equipment for rural domestic sewage treatment according to claim 3, characterized in that: A filtration zone (12) is provided between the aerobic tank (9) and the clear water tank (20). An air-lift backwash return pipe (13), an air-wash pipe (14), an air-lift sludge return pipe (15), and an air-lift water pipe (16) are provided on the treatment tank (1) at the position corresponding to the filtration zone (12).

5. The equipment for rural domestic sewage treatment according to claim 4, characterized in that: The treatment tank (1) has an inlet (2) installed on one side and an outlet (19) installed on the other side.

6. The equipment for rural domestic sewage treatment according to claim 5, characterized in that: A disinfection tank (17) is installed on the treatment tank (1) at the position corresponding to the water outlet (19).

7. The equipment for rural domestic sewage treatment according to claim 6, characterized in that: The top of the processing tank (1) is also provided with several maintenance inlets (18).

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