Village domestic sewage treatment and sludge resource utilization system

Abstract

The utility model discloses a village domestic sewage treatment and sludge resource utilization system which comprises an integrated water collector, an ecological filter tank, a primary water purification tank, a middle water tank, a secondary water purification tank and a clean water tank which are sequentially connected, and a fertilizer collection tank is arranged between the integrated water collector and the ecological filter tank; the bottom of the ecological filter tank is connected with the upper part of the fertilizer collecting tank through a sludge discharge pipe; the bottom of the fertilizer collecting tank is connected with the upper part of the integrated water collector through a fertilizer collecting tank water outlet pipe. The device has the characteristics of low investment cost, good sludge treatment effect, strong impact load resistance, land conservation, stable effluent quality, simplicity and convenience in construction, short construction period, convenience in maintenance and management, low operation cost, good environmental landscape effect, no peculiar smell and the like, and is suitable for the fields of rural domestic sewage treatment and sludge resource utilization; particularly, the method can be widely popularized in domestic sewage treatment and sludge resource utilization in villages or small towns.

Description

Technical Field

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

[0002] Currently, the main processes for treating domestic sewage in villages and towns include traditional biological methods, constructed wetlands, rapid infiltration processes, and improved oxidation ponds. In the biological treatment of sewage, microorganisms utilize organic matter, nitrogen, phosphorus, and other nutrients in the sewage to synthesize biological cells, completing their own growth and reproduction, which macroscopically manifests as an increase in sludge concentration. The sludge produced during sewage treatment has a high water content, unstable properties, and contains a large amount of toxic and harmful substances from the original sewage; if left untreated, it can lead to secondary environmental pollution. Given the requirements of environmental protection and health and hygiene, sludge must undergo effective treatment and proper disposal.

[0003] Sedimentation tanks and filtration tanks discharge sludge during daily operation. The sludge typically consists of suspended solids and partially dissolved substances from the raw water. A common sludge treatment process in large wastewater treatment plants is: sludge discharge tank → thickening tank → chemical dosing → sludge dewatering followed by off-site disposal. Mechanical dewatering requires not only a chemical dosing system but also a compressed air system or vacuum system.

[0004] Village and township domestic sewage treatment plants are generally small in scale, with a common treatment capacity of 30m³. 3 / d~150m 3 Because the scale of water treatment is small and the amount of sludge discharged is also small, it is obviously not cost-effective to equip the sludge treatment with mechanical dewatering devices with dosing, compressed air, and vacuum systems. There is a lack of suitable models of sludge dewatering machinery, and mechanical dewatering also requires dedicated operating positions. Therefore, most village and township domestic sewage treatment plants are not equipped with sludge treatment equipment and facilities, and the discharged sludge is directly composted nearby or flows into rivers.

[0005] In areas with high environmental protection requirements, the common practice is to design an additional sludge thickening tank. However, the effluent quality from the sludge thickening tank remains poor, and its discharge will pollute rivers. Moreover, the treated sludge still has a high water content, approximately 98%–96%, making it inconvenient for transportation and final disposal. Therefore, the treatment and disposal of sludge from village and township domestic sewage treatment systems must be based on the scale of the village and township domestic sewage treatment project, the amount of sludge generated, and the characteristics of sludge resource utilization, to formulate an economical, reasonable, and safe sludge treatment and utilization plan. Utility Model Content

[0006] Based on this, the purpose of this utility model is to provide a system for treating domestic sewage and utilizing sludge resources in rural areas, so as to solve the technical problems mentioned in the background.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a village domestic sewage treatment and sludge resource utilization system, comprising an integrated water collector, an ecological filter, a primary water purification tank, an intermediate water tank, a secondary water purification tank, and a clear water tank connected in sequence. A fertilizer collection tank is provided between the integrated water collector and the ecological filter. The bottom of the ecological filter is connected to the top of the fertilizer collection tank through a sludge discharge pipe, and the bottom of the fertilizer collection tank is connected to the top of the integrated water collector through a fertilizer collection tank outlet pipe.

[0008] Furthermore, the fertilizer collection tank is equipped with a filter media for seepage, and a second water distribution pipe is provided above the filter media. The second water distribution pipe is connected to the sludge discharge pipe, and a sludge discharge valve is provided on the sludge discharge pipe.

[0009] Furthermore, the inlet of the integrated water collector is equipped with a coarse and fine screen, and inside it are a first sewage lift pump and a first float switch. The ecological filter tank is equipped with a first water distribution pipe and high-efficiency microporous filter media. The first sewage lift pump is connected to the first water distribution pipe through a pipeline.

[0010] Furthermore, the ecological filter is connected to a third water distribution pipe installed above the primary water purification tank via a pipe. Both the primary and secondary water purification tanks are ecological biological combined water purification tanks, and each is equipped with an impermeable membrane, fixed bed packing material, and plants from bottom to top.

[0011] Furthermore, the bottom of the primary water purification tank is connected to the top of the intermediate water tank via the primary water purification tank outlet pipe. The intermediate water tank is equipped with a second sewage lift pump and a second float level switch. The second sewage lift pump is connected to a fourth water distribution pipe installed above the secondary water purification tank via the secondary water purification tank inlet pipe. The bottom of the secondary water purification tank is connected to the top of the clear water tank via the secondary water purification tank outlet pipe. The clear water tank is equipped with a third sewage lift pump and a third float level switch. The third sewage lift pump is connected to the clear water tank outlet pipe.

[0012] In summary, the present invention has the following main advantages:

[0013] This utility model's ecological filter, ecological-biological combined water purification system, and fertilizer collection tank can be modularly designed, featuring low investment cost, good sludge treatment effect, strong resistance to shock loads, land saving, stable effluent quality, simple construction, short construction period, convenient maintenance and management, low operating cost, good environmental landscape effect, and no odor. It is suitable for rural domestic sewage treatment and sludge resource utilization, and can be widely promoted, especially in the resource utilization of sludge from domestic sewage treatment in villages or small towns. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0016] The embodiments of this utility model will be described below based on its overall structure.

[0017] A system for treating domestic sewage and utilizing sludge in rural areas, such as Figure 1 As shown, this utility model includes an integrated water collector 1, an ecological filter 2, a primary water purification tank 3, an intermediate water tank 4, a secondary water purification tank 5, and a clear water tank 6 connected in sequence. A fertilizer collection tank 7 is provided between the integrated water collector 1 and the ecological filter 2. The bottom of the ecological filter 2 is connected to the top of the fertilizer collection tank 7 through a sludge discharge pipe 14. The bottom of the fertilizer collection tank 7 is connected to the top of the integrated water collector 1 through a fertilizer collection tank outlet pipe 17. The fertilizer collection tank 7 is provided with a permeable filter media 16. A second water distribution pipe 15 is provided above 16. The second water distribution pipe 15 is connected to the sludge discharge pipe 14. The sludge discharge pipe 14 is provided with a sludge discharge valve 13. The inlet of the integrated water collector 1 is provided with an inlet end coarse and fine screen 8. Inside it are a first sewage lift pump 9 and a first float switch 10. The ecological filter tank 2 is provided with a first water distribution pipe 11 and a high-efficiency microporous filter media 12. Plants are planted on the high-efficiency microporous filter media 12. The first sewage lift pump 9 is connected to the first water distribution pipe 11 through a pipe.

[0018] The ecological filter 2 is connected to the third water distribution pipe 18 installed above the primary water purification tank via a pipe. The primary water purification tank 3 and the secondary water purification tank 5 are both ecological biological combined water purification tanks. From bottom to top, each tank is equipped with an impermeable membrane 22, a fixed bed packing material 19, and plants 23. Both the primary water purification tank 3 and the secondary water purification tank 5 are equipped with aeration pipes 20. The fixed bed packing material 19 has a good adsorption effect and can provide a suitable environment for the growth of microorganisms, which can promote the rapid growth of microorganisms in the packing material. When the sewage passes through the packing material for the first time, the packing material adsorbs the pollutants in the sewage through its adsorption effect. After the system has been running for a period of time, the microorganisms in the packing material multiply in large numbers. The microorganisms degrade the pollutants such as organic matter, ammonia nitrogen, and phosphorus in the sewage through their own oxidation and in conjunction with the growth and absorption of the surface plants 23, so that the effluent of the sewage ecological purification system can meet the discharge requirements. The plants 23 are wetland and terrestrial plants.

[0019] The bottom of the primary water purification tank 3 is connected to the top of the intermediate water tank 4 through the primary water purification tank outlet pipe 21. The intermediate water tank 4 is equipped with a second sewage lift pump 24 and a second float level switch 25. The second sewage lift pump 24 is connected to the fourth water distribution pipe 27 installed above the secondary water purification tank 2 through the secondary water purification tank inlet pipe 26. The bottom of the secondary water purification tank 5 is connected to the top of the clear water tank 6 through the secondary water purification tank outlet pipe 30. The clear water tank 6 is equipped with a third sewage lift pump 28 and a third float level switch 29. The third sewage lift pump 28 is connected to the clear water tank outlet pipe 31.

[0020] The wastewater purification process of this utility model:

[0021] Wastewater first passes through the coarse and fine screens 8 at the inlet end of the integrated water collector 1 to remove larger solids before entering the integrated water collector 1. Then, the wastewater is lifted by the first wastewater lift pump 9 in the integrated water collector 1 to the ecological filter tank 2. In the ecological filter tank 2, smaller suspended solids are removed by the high-efficiency microporous filter media 12. The supernatant flows by gravity into the primary ecological-biological combined water purification tank 3 for further treatment. The intercepted suspended solids are periodically backwashed through the sludge discharge valve 13 and discharged into the fertilizer collection tank 7. The wastewater flowing into the primary ecological-biological combined water purification tank 3 is evenly distributed throughout the system through the second water distribution pipe 18, and then... The primary ecological-biological combined water purification tank 3 is further purified by the absorption and degradation of various wetland and terrestrial plants and the filtration and adsorption of multi-stage packing. The effluent flows into the intermediate water tank 4 for temporary storage. When the water level in the intermediate water tank 4 reaches the set requirement, the second float level switch 25 controls the water pump to start and pump the water to the secondary ecological-biological combined water purification tank 5 for further treatment. After treatment in the secondary ecological-biological combined water purification tank 5, the effluent flows into the clear water tank 6 for temporary storage. When the water level in the clear water tank 6 reaches the set requirement, the third float level switch 29 controls the water pump to start and pump the treated clear water to the receiving water body.

[0022] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A system for treating domestic sewage and utilizing sludge in rural areas, characterized in that, It includes an integrated water collector, an ecological filter, a primary water purification tank, an intermediate water tank, a secondary water purification tank, and a clear water tank connected in sequence. A fertilizer collection tank is provided between the integrated water collector and the ecological filter. The bottom of the ecological filter is connected to the top of the fertilizer collection tank through a sludge discharge pipe. The bottom of the fertilizer collection tank is connected to the top of the integrated water collector through a fertilizer collection tank outlet pipe.

2. The system for treating rural domestic sewage and utilizing sludge resources according to claim 1, characterized in that: The fertilizer collection tank is equipped with a filter media for seepage and drainage. A second water distribution pipe is located above the filter media and is connected to a sludge discharge pipe. A sludge discharge valve is installed on the sludge discharge pipe.

3. The system for treating rural domestic sewage and utilizing sludge resources according to claim 1, characterized in that: The integrated water collector has a coarse and fine screen at the inlet, and a first sewage lift pump and a first float switch inside. The ecological filter tank has a first water distribution pipe and high-efficiency microporous filter media. The first sewage lift pump is connected to the first water distribution pipe through a pipeline.

4. The village domestic sewage treatment and sludge resource utilization system according to claim 1, characterized in that: The ecological filter is connected to the third water distribution pipe installed above the primary water purification tank via a pipe. Both the primary and secondary water purification tanks are ecological biological combined water purification tanks, and each tank is equipped with an impermeable membrane, fixed bed packing material, and plants from bottom to top.

5. The system for treating rural domestic sewage and utilizing sludge resources according to claim 1, characterized in that: The bottom of the primary water purification tank is connected to the top of the intermediate water tank via the primary water purification tank outlet pipe. The intermediate water tank is equipped with a second sewage lift pump and a second float level switch. The second sewage lift pump is connected to a fourth water distribution pipe installed above the secondary water purification tank via the secondary water purification tank inlet pipe. The bottom of the secondary water purification tank is connected to the top of the clear water tank via the secondary water purification tank outlet pipe. The clear water tank is equipped with a third sewage lift pump and a third float level switch. The third sewage lift pump is connected to the clear water tank outlet pipe.

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