Domestic sewage treatment and resource utilization system for peasant households

Abstract

The utility model discloses a domestic sewage treatment and resource utilization system for peasant households. The domestic sewage treatment and resource utilization system comprises an oil and slag separation tank, a three-stage purification tank, a resource utilization storage tank, an irrigation system and an artificial wetland, one side of the oil and residue separation pool is used for collecting sewage discharged from a kitchen, the other side of the oil and residue separation pool is communicated to the resource utilization and storage pool, one side of the third-stage purification pool is used for collecting sewage discharged from a toilet, and the other side of the third-stage purification pool is communicated to the resource utilization and storage pool; the resource utilization storage pool is respectively communicated with the irrigation system and the constructed wetland, so that sewage treated by the resource utilization storage pool is communicated to the irrigation system and the constructed wetland; according to the use information, high-concentration sewage discharged by toilets and oil-containing and slag-containing sewage discharged by kitchens are separately collected and treated, so that different types of sewage are subjected to proper pretreatment measures, the pollutant removal efficiency is improved, and meanwhile, the situation that the sewage is mixed and enters a septic tank, and the sewage overflows and is discharged to pollute the environment is solved.

Description

Technical Field

[0001] This information pertains to the field of domestic sewage treatment technology, specifically to a domestic sewage treatment and resource utilization system for rural households. Background Technology

[0002] In recent years, with the acceleration of urbanization in rural China and the continuous improvement of rural residents' living standards, the discharge of rural domestic sewage has been rising, seriously affecting the sustainable development of water resources. Currently, the coverage rate of rural domestic sewage treatment facilities is low, and there is a lack of effective treatment processes. This results in a large amount of untreated sewage being directly discharged into water bodies, not only deteriorating the rural living environment but also polluting groundwater and surface water, thus inducing various diseases and placing enormous pressure on water quality and the ecological environment. To achieve effective treatment of rural domestic sewage and protect the rural ecological environment and residents' health, researching a suitable rural domestic sewage treatment process has become an urgent task.

[0003] Currently, there are three wastewater treatment models used in rural scattered household sewage treatment projects: The first is the connection and treatment model, which connects rural domestic sewage from households near municipal sewage networks with suitable construction conditions to the municipal network for unified treatment. This involves collecting sewage from all households within the village through centralized sewage pipes and then connecting it to the nearest municipal sewage network for unified treatment at urban sewage treatment plants. This model is characterized by low investment, short construction period, quick results, and convenient unified management. It not only saves investment in rural sewage treatment facilities but also ensures good sewage treatment results and operational management guarantees due to the unified treatment of sewage by urban sewage treatment plants. The second is the concentrated treatment model, which is used in villages with relatively concentrated populations and a lack of surrounding land for wastewater disposal. Based on the collection of individual household sewage, the sewage is discharged into the village's public drainage system and then into a centralized sewage treatment system. This model mainly targets central villages, residential areas, or densely populated natural villages, constructing supporting pipe network collection systems to centrally collect sewage generated by households, and then constructing centralized sewage treatment facilities between administrative villages to treat village domestic sewage. The centralized collection and treatment of village sewage should be tailored to local conditions, flexibly arranged, and decided upon prudently. The decentralized treatment model, which collects sewage from individual households or linked households for separate treatment, is characterized by flexible layout, cost savings in pipeline laying, and simple construction. It is suitable for villages where households are scattered, terrain conditions are complex, construction is difficult, and sewage is not easy to collect centrally.

[0004] Decentralized treatment has become the preferred method for rural wastewater treatment due to its low cost and relatively low subsequent operation and maintenance costs. However, decentralized treatment still has many problems: ① Rural domestic sewage mainly includes toilet drainage and kitchen drainage. High-concentration sewage from toilets mixes with oily and sludge-containing sewage from kitchens and enters septic tanks, failing to achieve the goals of harmlessness, volume reduction, and oil removal; ② The mixing of sewage also leads to a smaller septic tank volume, causing sewage to be directly discharged from the septic tank, polluting the environment and affecting subsequent resource utilization; ③ The treated effluent needs to be transported to the receiving water body through water pipes, resulting in high construction investment costs; when the receiving water body is far away or at a high altitude, power lifting is required, leading to higher operation and maintenance costs; in the absence of a clear responsibility for operation and maintenance and a lack of guaranteed operating costs, the sewage treatment facility will have a low operating rate; ④ Sewage overflows or is randomly discharged when the land cannot absorb it, also affecting the surrounding water environment. Utility Model Content

[0005] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a system for the treatment and resource utilization of domestic sewage for farmers. This system solves the problems of environmental pollution caused by the indiscriminate discharge of domestic sewage by farmers or the high cost of constructing sewage pipes for centralized collection and treatment. At the same time, it realizes the resource utilization of domestic sewage. This application provides the following technical solution:

[0006] A system for treating and utilizing domestic sewage for farmers includes an oil-water separator, a three-stage purification tank, a resource utilization storage tank, an irrigation system, and an artificial wetland.

[0007] One side of the grease trap is used to collect sewage discharged from the kitchen, and the other side of the grease trap is connected to the resource utilization storage tank. One side of the tertiary purification tank is used to collect sewage discharged from the toilet, and the other side of the tertiary purification tank is connected to the resource utilization storage tank.

[0008] The resource utilization storage tank is connected to the irrigation system and the constructed wetland respectively, so that the wastewater treated by the resource utilization storage tank can be connected to the irrigation system and the constructed wetland.

[0009] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, the resource utilization storage tank includes a sedimentation zone, an anaerobic zone, and a storage zone arranged in sequence. The sedimentation zone receives sewage from an oil-water separator or a three-stage purification tank, and the storage zone is connected to the irrigation system and the constructed wetland, respectively.

[0010] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, the irrigation system includes a solar-powered micro-irrigation system and a gravity-fed irrigation system. The solar-powered micro-irrigation system draws sewage treated in the resource utilization storage tank and irrigates the farmland. The gravity-fed irrigation system includes a gravity-fed water pipe, one end of which is connected to the resource utilization storage tank, and the other end of which is connected to the farmland.

[0011] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, the solar-powered micro-irrigation system includes a power water pipe, a solar system water pump, a control cabinet, and a solar panel. The solar system water pump is installed in the resource utilization storage tank. The solar system water pump draws the treated sewage from the resource utilization storage tank and irrigates the farmland through the power water pipe. The solar panel is installed on one side of the resource utilization storage tank and is connected to the control cabinet and the solar system water pump in sequence.

[0012] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, the artificial wetland is planted with aquatic plants.

[0013] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, a soil ditch is provided on the side of the constructed wetland away from the resource utilization storage pond, and the water treated by the constructed wetland is discharged into the soil ditch.

[0014] As an alternative or supplement to the aforementioned domestic sewage treatment and resource utilization system for farmers, the oil-water separator, the three-stage purification tank, and the resource utilization storage tank are made of fiberglass and are connected to each other by PVC water pipes.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this information are:

[0016] This information improves the existing rural scattered household domestic sewage treatment model by designing an oil-water separator, a three-stage purification tank, a resource utilization and storage tank, an irrigation system, and an artificial wetland. It separates and treats high-concentration sewage from toilets and oily and sludge-containing sewage from kitchens. Toilet sewage first enters the three-stage purification tank for harmlessness and volume reduction, while kitchen sewage first enters the oil-water separator for oil, water, and sludge separation. This allows different types of sewage to be treated with appropriate pretreatment measures, improving pollutant removal efficiency and solving the problem of sewage mixing into septic tanks and sewage overflow and pollution of the environment.

[0017] Meanwhile, toilet wastewater and kitchen wastewater, after being treated as described above, enter a resource utilization storage tank for sedimentation and anaerobic treatment before being stored. The stored wastewater can be used for resource utilization in nearby farmland, vegetable gardens, and woodlands, alleviating the problem of water waste. At the same time, the treated effluent is used for irrigation, saving the construction investment cost of effluent transportation.

[0018] Furthermore, the irrigation system is selected based on the distance and terrain of the surrounding vegetable gardens, farmland, and other land suitable for water absorption. When there are nearby farmland, vegetable gardens, or woodlands, a gravity-fed irrigation system is used; when the farmland, vegetable gardens, or woodlands are at a higher elevation or are far away, and the treated water cannot flow there by gravity, a solar-powered micro-irrigation system is used. Gravity-fed or solar-powered micro-irrigation systems significantly reduce operating costs, increase farmers' enthusiasm for participating in operation and maintenance, and effectively solve the problem of long-term operation of rural sewage treatment facilities.

[0019] Finally, excess water absorbed by the land enters the ecological treatment process—deep treatment in constructed wetlands—before entering the soil ditch, infiltrating or flowing into nearby existing ditches to replenish surface and groundwater, thus constructing a sustainable and healthy water cycle system.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this usage information and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the information usage process.

[0023] Figure 2 This is a floor plan layout diagram of the information used.

[0024] Attached diagram labels: 1-Oil-water separator; 2-Three-stage purification tank; 3-Resource utilization and storage tank; 4-Gravity self-flowing irrigation system; 5-Solar micro-power irrigation system; 6-Artificial wetland; 7-Soil ditch; 8-Sedimentation zone; 9-Anaerobic zone; 10-Storage zone; 11-Solar system water pump; 12-Control cabinet; 13-Solar panel; 14-Aquatic plants. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Please refer to Figure 1-2 As shown in the figure, this embodiment provides a domestic sewage treatment and resource utilization system for farmers, including an oil-water separator 1, a three-stage purification tank 2, a resource utilization storage tank 3, an irrigation system, and an artificial wetland 6. One side of the oil-water separator 1 is used to collect sewage discharged from the kitchen, and the other side of the oil-water separator 1 is connected to the resource utilization storage tank 3. One side of the three-stage purification tank 2 is used to collect sewage discharged from the toilet, and the other side of the three-stage purification tank 2 is connected to the resource utilization storage tank 3. The resource utilization storage tank 3 is connected to the irrigation system and the artificial wetland 6, so that the sewage treated by the resource utilization storage tank 3 is connected to the irrigation system and the artificial wetland 6.

[0029] The resource utilization storage tank 3 includes a sedimentation zone 8, an anaerobic zone 9 and a storage zone 10 arranged in sequence. The sedimentation zone 8 receives wastewater from the oil-water separator or the tertiary purification tank 2. The storage zone 10 is connected to the irrigation system and the artificial wetland 6 respectively.

[0030] The artificial wetland 6 is planted with aquatic plants; a soil ditch is set on the side of the artificial wetland 6 away from the resource utilization storage pond 3, and the water treated by the artificial wetland 6 is discharged into the soil ditch.

[0031] In the above embodiments, such as Figure 1 The diagram shown is a flowchart illustrating the flow structure of this information. Figure 2The diagram shown is a floor plan of this information. The domestic wastewater treatment and resource utilization system for farmers includes five main components: an oil-water separator 1, a three-stage purification tank 2, a resource utilization and storage tank 3, an irrigation system, and an artificial wetland 6. These components are connected by water pipes. Kitchen wastewater from farmers enters the oil-water separator 1, where oil, water, and residue are separated. The oil-water separator works by utilizing the density differences between oil, water, and residue, separating them by gravity. The working principle of the oil-water separator 1 mainly consists of two steps: pretreatment and separation. First, wastewater enters the oil-water separator 1 through the inlet. During pretreatment, large solid particles in the wastewater settle to the bottom, while grease floats on the surface. After pretreatment, the wastewater enters the separation stage. In the separation stage, the wastewater passes through oil-water separators and residue separators, further separating the grease and solid particles. The function of the grease trap is to regulate the water flow speed and direction, causing grease to form a thin film in the water and flow downwards along the plate surface. The grease collection trough on the grease trap collects the grease. The sludge trap, on the other hand, separates solid particles by blocking them, causing them to settle to the bottom, thus achieving solid-liquid separation. The separated wastewater enters the next-stage resource utilization storage tank 3. Toilet wastewater from farmers enters the tertiary purification tank 2, where it undergoes harmless treatment and volume reduction. The toilet wastewater enters the first tank of the tertiary purification tank 2 through the inlet. In this tank, the wastewater and excrement begin to ferment and decompose. Due to differences in specific gravity, the wastewater naturally separates into three layers: an upper layer of pasty skin, a lower layer of blocky or granular sludge, and a middle layer of relatively clear liquid. The upper skin and lower sludge contain the most bacteria and parasite eggs, while the middle layer contains the fewest. The partially fermented middle layer overflows into the second tank, while most of the insufficiently fermented skin and sludge remain in the first tank for further fermentation. The liquid flowing into the second pool undergoes further fermentation and decomposition, the insect eggs continue to sink, the pathogens gradually die, and the wastewater is further rendered harmless. The thickness of the resulting skin and sludge is significantly reduced compared to the first pool.The wastewater flowing into the third tank is generally already decomposed, with most pathogens and parasite eggs killed. The third tank of the tertiary purification tank 2 mainly serves to store the essentially harmless wastewater. The treated wastewater also flows into the next-stage resource utilization storage tank 3. The resource utilization storage tank 3 is divided into three compartments: a sedimentation zone 8, an anaerobic zone 9, and a storage zone 10. In the resource utilization storage tank 3, the wastewater undergoes sedimentation and anaerobic treatment again. Specifically, when the wastewater enters the first sedimentation tank of the resource utilization storage tank 3, most solid impurities and sediments will settle at the bottom of the tank, forming a sludge layer, while the clear water on top will flow into the next stage through the inlet and outlet. In the two-compartment anaerobic tank, anaerobic bacteria decompose organic matter in the wastewater, producing gases such as methane, hydrogen, and carbon dioxide. These gases rise to form a bubble layer, while the clear water at the bottom flows into the third-compartment storage tank through the inlet and outlet. The treated wastewater is temporarily stored in the storage area 10. When surrounding vegetable gardens, farmland, and other land requiring irrigation need to be irrigated, it is irrigated through the irrigation system. Excess water in the storage area 10 enters the constructed wetland 6 for further purification. The water treated by the constructed wetland 6 is discharged into the soil ditch 7 and merges into the nearby existing ditches, replenishing surface and groundwater, thus constructing a sustainable and healthy water cycle system.

[0032] In this embodiment, the constructed wetland 6 adopts a horizontal subsurface flow system with bottom inlet and top outlet. Aquatic plants 14 are planted on the constructed wetland 6. The aquatic plants 14 are selected according to the local climate, and plants with high survival rate, strong water resistance, long growth cycle and the ability to effectively remove organic matter from sewage are preferred, such as canna lilies. The density is 25 plants / square meter.

[0033] In an alternative embodiment of the above, the irrigation system includes a solar micro-powered irrigation system 5 and a gravity-fed irrigation system 4. The solar micro-powered irrigation system 5 draws wastewater treated by the resource utilization storage tank 3 to irrigate the farmland. The gravity-fed irrigation system 4 includes a gravity-fed water pipe, one end of which is connected to the resource utilization storage tank 3 and the other end of which is connected to the farmland.

[0034] The solar-powered micro-irrigation system 5 includes a power water pipe, a solar system water pump 11, a control cabinet 12, and a solar panel 13. The solar system water pump 11 is installed in the resource utilization storage tank 3. The solar system water pump 11 draws the treated wastewater from the resource utilization storage tank 3 and irrigates the farmland through the power water pipe. The solar panel 13 is installed on one side of the resource utilization storage tank 3 and is connected to the control cabinet 12 and the solar system water pump 11 in sequence.

[0035] In this alternative scheme, the irrigation system can be selected based on the distance and terrain of the surrounding vegetable gardens, farmland, and other land for water absorption. Gravity-fed irrigation system 4 or solar-powered micro-irrigation system 5 can be used. When there are nearby farmland, vegetable gardens, or woodlands, gravity-fed irrigation system 4 is selected. When the farmland, vegetable gardens, or woodlands are at a higher or farther elevation, and the treated water cannot flow there by gravity, solar-powered micro-irrigation system 5 is used. When selecting solar-powered micro-irrigation system 5, a solar system water pump 11 is installed at the bottom of the storage area 10 of the resource utilization storage tank 3. Water enters the solar-powered micro-irrigation system 5 through the solar system water pump 11. To implement solar-powered micro-irrigation system 5, a control cabinet 12 and solar panels 13 are also required. The solar panels 13 are solar photovoltaic panels with a long service life.

[0036] In the alternative embodiments described above, the oil-water separator 1, the three-stage purification tank 2, and the resource utilization storage tank 3 are made of fiberglass and are interconnected via PVC water pipes.

[0037] In this alternative scheme, the oil-water separator 1, the tertiary purification tank 2, and the resource utilization storage tank 3 are made of integral fiberglass, and the connecting water pipes are made of PVC pipes. In one possible embodiment, this usage information can be configured for one household, two to three households, and four to six households, depending on the number of households receiving sewage. For example, when there is one household receiving sewage, the effective volume of the oil-water separator 1 and the tertiary purification tank 2 is one cubic meter, the effective volume of the resource utilization storage tank 3 is two cubic meters, and the planting area of ​​the artificial wetland 6 is one cubic meter; when there are two to three households receiving sewage, the effective volume of the oil-water separator 1 and the tertiary purification tank 2 is three cubic meters, the effective volume of the resource utilization storage tank 3 is four cubic meters, and the planting area of ​​the artificial wetland 6 is three cubic meters; when there are four to six households receiving sewage, the effective volume of the oil-water separator 1 and the tertiary purification tank 2 is five cubic meters, the effective volume of the resource utilization storage tank 3 is six cubic meters, and the planting area of ​​the artificial wetland 6 is six cubic meters. The configuration can be reasonably set according to different situations.

[0038] Therefore, this information is closely integrated with the actual situation of farmers, cleverly combining sewage treatment with resource utilization. It mainly adopts the model of "single or joint household oil and slag separator 1 / three-stage purification tank 2 + resource utilization storage tank 3 + gravity-fed irrigation system 4 / solar micro-power irrigation system 5 + artificial wetland 6". The resource utilization storage tank 3 and solar micro-power irrigation system 5 are scientifically and rationally designed. The treated effluent is scientifically selected for resource utilization in vegetable gardens, gardens, orchards, fields, etc., according to the surrounding environment. The remaining water after resource utilization enters the artificial wetland 6 for deep treatment to meet the standards, and then is discharged into the soil ditch 7 for infiltration or discharged into the existing nearby ditch to replenish surface water and groundwater.

[0039] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A system for treating and utilizing domestic sewage for rural households, characterized in that: The system comprises an oil and sludge separation tank, a three-stage purification tank, a resource utilization storage tank, an irrigation system and an artificial wetland. One side of the oil and sludge separation tank is used for collecting sewage discharged from a kitchen, and the other side of the oil and sludge separation tank is connected to the resource utilization storage tank. The resource utilization storage tank is connected to the irrigation system and the artificial wetland, so that the treated sewage in the resource utilization storage tank is connected to the irrigation system and the artificial wetland.

2. The domestic sewage treatment and resource utilization system for farmers according to claim 1, characterized in that: The resource utilization storage tank comprises a sedimentation zone, an anaerobic zone and a storage zone arranged in sequence.

3. The domestic sewage treatment and resource utilization system for farmers according to claim 1, characterized in that: The sedimentation zone receives sewage from the oil and sludge separation tank or the three-stage purification tank.

4. The domestic sewage treatment and resource utilization system for farmers according to claim 3, characterized in that: The irrigation system comprises a solar micro-power irrigation system and a gravity self-flow irrigation system.

5. The domestic sewage treatment and resource utilization system for farmers according to claim 1, characterized in that: The solar micro-power irrigation system extracts the treated sewage in the resource utilization storage tank and irrigates farmland.

6. The domestic sewage treatment and resource utilization system for farmers according to claim 1, characterized in that: The solar micro-power irrigation system comprises a power water pipe, a solar system water pump, a control cabinet and a solar panel.

7. The domestic sewage treatment and resource utilization system for farmers according to claim 1, characterized in that: The solar system water pump is arranged in the resource utilization storage tank. The solar panel is arranged on one side of the resource utilization storage tank. The artificial wetland is planted with aquatic plants. The artificial wetland is provided with a soil ditch on the side away from the resource utilization storage tank. The treated water in the artificial wetland is discharged into the soil ditch. The oil and sludge separation tank, the three-stage purification tank and the resource utilization storage tank are made of glass steel material and are connected by PVC water pipes.

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