Rural domestic sewage treatment system

Abstract

The utility model discloses a rural domestic sewage treatment system, including pretreatment unit, biological treatment unit and artificial wetland unit, the water inlet end of pretreatment unit is connected sewage source, and pretreatment unit is used for removing the large granular impurity in sewage, the water inlet end of biological treatment unit is connected with the water outlet end of pretreatment unit, and biological treatment unit is used for removing the nitrogen, phosphorus and organic pollutant in sewage, the water inlet end of artificial wetland unit is connected with the water outlet end of biological treatment unit, and artificial wetland unit is used for strengthening the treatment effect to each pollutant to meet the water requirement. The utility model can solve the existing rural domestic sewage treatment's technical problem of not being completely treated, the larger floor space and the higher operation and maintenance cost of pollutant.

Description

Technical Field

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

[0002] In recent years, with the rapid development of rural tourism, more and more people yearn for rural life and flock to the countryside to experience rural life during their leisure time. However, this has led to a significant increase in the discharge of rural domestic sewage. Traditional rural sewage treatment methods, due to the vast land area, sparse population, and limited construction conditions in rural areas, often rely on natural or simple ecological treatment methods, such as garbage incineration, landfill, and biogas production. These methods are characterized by two main drawbacks: firstly, incomplete sewage treatment, leaving the environment still threatened; and secondly, the dispersed nature of treatment facilities, resulting in a large overall land area and high operating and maintenance costs. Therefore, traditional rural sewage treatment methods are no longer suitable for the current development needs of rural areas, especially in regions with limited land resources. Thus, there is an urgent need to develop a rural domestic sewage treatment system that requires less land, treats pollutants more thoroughly, and operates stably. Utility Model Content

[0003] The purpose of this utility model is to provide a rural domestic sewage treatment system that can solve the technical problems of incomplete pollutant treatment, large land area, and high operation and maintenance costs in existing rural domestic sewage treatment systems.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: A rural domestic sewage treatment system, comprising: A pretreatment unit, the inlet of which is connected to a wastewater source, is used to remove large particulate impurities from the wastewater; A biological treatment unit, wherein the inlet of the biological treatment unit is connected to the outlet of the pretreatment unit, and the biological treatment unit is used to remove nitrogen, phosphorus and organic pollutants from wastewater; An artificial wetland unit, wherein the inlet of the artificial wetland unit is connected to the outlet of the biological treatment unit, and the artificial wetland unit is used to enhance the treatment effect of various pollutants to meet the effluent requirements.

[0005] In some embodiments, the pretreatment unit includes a septic tank and a regulating tank. The inlet of the septic tank is connected to a sewage source, the outlet of the septic tank is connected to the regulating tank, and the other end of the regulating tank is connected to the biological treatment unit. The septic tank is used to settle and decompose solid pollutants, and the regulating tank is used to balance water quality and quantity.

[0006] In some embodiments, the biological treatment unit includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence. The inlet of the anaerobic tank is connected to the outlet of the equalization tank, and the outlet of the aerobic tank is connected to the constructed wetland unit.

[0007] In some embodiments, at least one of the anaerobic, anoxic, and aerobic tanks is filled with elastic biological packing material.

[0008] In some embodiments, the biological treatment unit further includes an aeration device disposed in the aerobic tank for providing oxygen to the activated sludge.

[0009] In some embodiments, the biological treatment unit further includes a sedimentation tank and a sludge tank. The inlet of the sedimentation tank is connected to the aerobic tank, the outlet of the sedimentation tank is used to discharge treated wastewater, and the bottom of the sedimentation tank has a sludge discharge outlet connected to the sludge tank.

[0010] In some embodiments, the constructed wetland unit includes a composite ecological reaction bed and a surface flow constructed wetland, wherein the inlet of the composite ecological reaction bed is connected to the outlet of the sedimentation tank, and the outlet of the composite ecological reaction bed is connected to the surface flow constructed wetland.

[0011] In some embodiments, aquatic plants are planted in both the composite ecological reaction bed and the surface flow constructed wetland, with a planting density of 10–20 plants / m². 2 .

[0012] In some embodiments, the constructed wetland unit further includes a filtration pond disposed at the front end of the composite ecological reaction bed.

[0013] In some embodiments, the system further includes an equipment room in which a controller and a rotary fan are arranged, the controller being electrically connected to the rotary fan and electrical components in the biological treatment unit.

[0014] Compared with the prior art, the beneficial effects of this utility model mainly include: This utility model provides a rural domestic sewage treatment system. A pretreatment unit removes large-volume impurities such as household waste from the sewage. A biological treatment unit removes nitrogen, phosphorus, and organic matter from the pretreated sewage. An artificial wetland unit further enhances the treatment of the sewage, achieving higher effluent standards. Thus, this rural domestic sewage treatment system can thoroughly treat sewage, which can then be used for irrigation, achieving reuse while protecting the environment. Furthermore, the various modules of this utility model are tightly connected, requiring a small footprint and facilitating maintenance, significantly reducing land area and operating costs. Attached Figure Description

[0015] Figure 1 This is a structural block diagram of the processing system described in this utility model; Figure 2 This is a schematic diagram of the structure of the biological treatment unit described in this utility model; Figure 3 This is a schematic diagram of the structure of the artificial wetland described in this utility model.

[0016] As shown in the figure: 100. Preprocessing unit; 200. Biological treatment unit; 210. Anaerobic tank; 220. Anoxic tank; 230. Aerobic tank; 240. Aeration device; 250. Sedimentation tank; 251. Sludge discharge outlet; 260. Sludge tank. 300. Constructed wetland unit; 310. Composite ecological reaction bed; 320. Surface flow constructed wetland; 400. Equipment room; 410. Controller; 420. Rotary fan. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] like Figure 1As shown, this utility model provides a rural domestic sewage treatment system, including a pretreatment unit 100, a biological treatment unit 200, and an constructed wetland unit 300. The inlet of the pretreatment unit 100 is connected to the sewage source, and the pretreatment unit 100 is used to remove large particulate impurities from the sewage. The inlet of the biological treatment unit 200 is connected to the outlet of the pretreatment unit 100, and the biological treatment unit 200 is used to remove nitrogen, phosphorus, and organic pollutants from the sewage. The inlet of the constructed wetland unit 300 is connected to the outlet of the biological treatment unit 200, and the constructed wetland unit 300 is used to enhance the treatment effect of various pollutants to meet the effluent requirements.

[0019] This utility model provides a rural domestic sewage treatment system. A pretreatment unit 100 pre-treats the sewage, removing large-volume impurities such as household waste. A biological treatment unit 200 removes nitrogen, phosphorus, and organic matter from the pre-treated sewage. An artificial wetland unit 300 further enhances the treatment of the sewage, achieving higher effluent standards. Thus, this rural domestic sewage treatment system can thoroughly treat sewage, allowing it to be used for irrigation, achieving reuse while protecting the environment. Furthermore, the various unit modules of this utility model are tightly connected, occupying a small area and facilitating maintenance, significantly reducing land area and maintenance costs.

[0020] In one embodiment, the pretreatment unit 100 includes a septic tank and a regulating tank. The inlet end of the septic tank is connected to a sewage source, the outlet end of the septic tank is connected to the regulating tank, and the other end of the regulating tank is connected to the biological treatment unit 200.

[0021] In the above technical solution, the septic tank is used to settle and decompose solid pollutants, and the regulating tank is used to balance water quality and quantity.

[0022] In one embodiment, such as Figure 2 As shown, the biological treatment unit 200 includes an anaerobic tank 210, an anoxic tank 220 and an aerobic tank 230 connected in sequence. The inlet end of the anaerobic tank 210 is connected to the outlet end of the regulating tank, and the outlet end of the aerobic tank 230 is connected to the constructed wetland unit 300.

[0023] In one embodiment, at least one of the anaerobic tank 210, the anoxic tank 220 and the aerobic tank 230 is filled with elastic biological packing material.

[0024] In one embodiment, the inner walls of the anaerobic tank 210, the anoxic tank 220, and the aerobic tank 230 are all coated with a high-temperature resistant and wear-resistant coating.

[0025] In one embodiment, the biological treatment unit 200 further includes an aeration device 240 disposed in the aerobic tank 230 for providing oxygen to the activated sludge.

[0026] In one embodiment, the biological treatment unit 200 further includes a sedimentation tank 250 and a sludge tank 260. The inlet of the sedimentation tank 250 is connected to the aerobic tank 230, and the outlet of the sedimentation tank 250 is used to discharge treated wastewater. The bottom of the sedimentation tank 250 has a sludge discharge port 251, which is connected to the sludge tank 260.

[0027] In the above technical solution, the biological treatment unit 200 is an anaerobic-anoxic-aerobic activated sludge process, that is, phosphorus and nitrogen removal reactions are completed through alternating anaerobic and aerobic, anoxic and aerobic environments. The effluent from the pretreatment unit 100 is pumped to the anaerobic tank 210, which creates an anaerobic environment (dissolved oxygen is approximately zero), conducive to the growth of anaerobic microorganisms, where activated sludge adsorbs and degrades organic matter. The effluent from the anaerobic tank 210 flows to the anoxic tank 220, where, under conditions of approximately 0.2 mg / L oxygen content, anoxic microorganisms begin to develop... The bacteria begin to multiply rapidly. Raw wastewater and phosphorus-containing return sludge discharged from sedimentation tank 250 enter simultaneously. The main function of anoxic tank 220 is to release phosphorus. Simultaneously, some organic matter undergoes ammoniation, initiating nitrification and decomposing large amounts of ammonia nitrogen and phosphorus-containing pollutants, thereby reducing the total nitrogen and total phosphorus content. In anoxic tank 220, denitrifying bacteria utilize the organic matter in the wastewater as a carbon source, reducing large amounts of NO3-N and NO2-N brought into the return mixed liquor to N2, which is released into the air. Therefore, the BOD5 concentration decreases, the NO3-N concentration decreases significantly, while the phosphorus concentration changes very little. The effluent from anoxic tank 220 flows by gravity to aerobic tank 230. Under oxygen-supplying conditions from the aeration system, aerobic microorganisms on the packing material further decompose the remaining organic matter in the wastewater into CO2, H2O, etc. This reaction unit is multifunctional, as BOD removal, nitrification, and phosphorus absorption all occur here. The function of the aerobic tank 230 is to allow the activated sludge to undergo aerobic respiration, further decomposing organic matter into inorganic matter, thereby removing pollutants.

[0028] In one embodiment, such as Figure 3 As shown, the constructed wetland unit 300 includes a composite ecological reaction bed 310 and a surface flow constructed wetland 320. The inlet of the composite ecological reaction bed 310 is connected to the outlet of the sedimentation tank 250, and the outlet of the composite ecological reaction bed 310 is connected to the surface flow constructed wetland 320.

[0029] In one embodiment, both the composite ecological reaction bed 310 and the surface flow constructed wetland 320 are planted with aquatic plants, and the planting density of the aquatic plants is 10-20 plants / m². 2 .

[0030] In one embodiment, the aquatic plant is one or more of the following: water onion, iris, loosestrife, etc.

[0031] In one embodiment, the constructed wetland unit 300 further includes a filter pool 330, which is disposed at the front end of the composite ecological reaction bed 310.

[0032] In the above technical solution, the composite ecological reaction bed 310 of the constructed wetland unit 300 fully considers the principles of natural ecology, and controls the distribution of sewage into a medium with a certain structure and good diffusion performance. The sewage slowly passes through the gravel and sand layer around the water distribution pipe. Through the action of a large number of microorganisms, the pollutants in the sewage are filtered, adsorbed and degraded, achieving deep filtration, removing a large amount of pollutants and purifying the sewage. The surface flow constructed wetland 320 in the constructed wetland unit 300 fully considers the landscape, and constructs a sewage treatment system with both ecological and landscape functions by planting different aquatic plants and flowers. Through the action of the root system, it achieves the effect of removing pollutants and purifying sewage.

[0033] In one embodiment, the treatment system further includes an equipment room 400, in which a controller 410 and a rotary blower 420 are arranged. The controller 410 is electrically connected to the rotary blower 420 and the electrical components in the biological treatment unit 200, respectively, to ensure that the sewage can enter each tank normally for treatment, and can also control the treated sludge to enter the sludge tank 260 for later maintenance.

[0034] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rural domestic sewage treatment system, characterized in that, include: A pretreatment unit, the inlet of which is connected to a wastewater source, is used to remove large particulate impurities from the wastewater; A biological treatment unit, wherein the inlet of the biological treatment unit is connected to the outlet of the pretreatment unit, and the biological treatment unit is used to remove nitrogen, phosphorus and organic pollutants from wastewater; An artificial wetland unit, wherein the inlet of the artificial wetland unit is connected to the outlet of the biological treatment unit, and the artificial wetland unit is used to enhance the treatment effect of various pollutants to meet the effluent requirements.

2. The rural domestic sewage treatment system according to claim 1, characterized in that, The pretreatment unit includes a septic tank and a regulating tank. The inlet of the septic tank is connected to the sewage source, and the outlet of the septic tank is connected to the regulating tank. The other end of the regulating tank is connected to the biological treatment unit. The septic tank is used to settle and decompose solid pollutants, and the regulating tank is used to balance the water quality and quantity.

3. The rural domestic sewage treatment system according to claim 2, characterized in that, The biological treatment unit includes an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence. The inlet of the anaerobic tank is connected to the outlet of the regulating tank, and the outlet of the aerobic tank is connected to the constructed wetland unit.

4. The rural domestic sewage treatment system according to claim 3, characterized in that, At least one of the anaerobic, anoxic, and aerobic tanks is filled with elastic biological packing material.

5. The rural domestic sewage treatment system according to claim 3, characterized in that, The biological treatment unit also includes an aeration device, which is installed in the aerobic tank to provide oxygen to the activated sludge.

6. The rural domestic sewage treatment system according to claim 3, characterized in that, The biological treatment unit also includes a sedimentation tank and a sludge tank. The inlet of the sedimentation tank is connected to the aerobic tank, and the outlet of the sedimentation tank is used to discharge treated wastewater. The bottom of the sedimentation tank has a sludge discharge outlet, which is connected to the sludge tank.

7. The rural domestic sewage treatment system according to claim 6, characterized in that, The constructed wetland unit includes a composite ecological reaction bed and a surface flow constructed wetland. The inlet of the composite ecological reaction bed is connected to the outlet of the sedimentation tank, and the outlet of the composite ecological reaction bed is connected to the surface flow constructed wetland.

8. The rural domestic sewage treatment system according to claim 7, characterized in that, Both the composite ecological reaction bed and the surface flow constructed wetland are planted with aquatic plants, with a planting density of 10–20 plants / m². 2 .

9. The rural domestic sewage treatment system according to claim 7, characterized in that, The constructed wetland unit also includes a filtration pond, which is located at the front end of the composite ecological reaction bed.

10. The rural domestic sewage treatment system according to claim 1, characterized in that, It also includes an equipment room, in which a controller and a rotary fan are arranged, and the controller is electrically connected to the electrical components of the rotary fan and the biological treatment unit respectively.

Images