Domestic sewage treatment and resource utilization system for peasant households

Abstract

The invention 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; high-concentration sewage discharged from toilets and oil-containing and slag-containing sewage discharged from 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] The invention belongs to the technical field of domestic sewage treatment, and specifically belongs to a domestic sewage treatment and resource utilization system for farmers. Background Art

[0002] At present, the penetration rate of domestic sewage treatment facilities in rural areas is low, and there is a lack of effective treatment processes, resulting in a large amount of sewage being discharged directly into water bodies without treatment, which not only deteriorates the rural living environment, but also pollutes groundwater and surface water, thereby inducing various diseases and bringing great pressure to water quality and the ecological environment. In order to achieve effective treatment of rural domestic sewage, protect the rural ecological environment and the health of residents, it has become an urgent task to study a suitable rural domestic sewage treatment process;

[0003] At present, there are three sewage treatment modes used in the domestic sewage treatment projects of scattered rural households, namely: takeover treatment mode, which connects rural domestic sewage that is close to the municipal sewage pipe network and has construction conditions to the municipal pipe network for unified treatment, that is, after the sewage of all farmers in the village is collected through sewage pipes, it is uniformly connected to the adjacent municipal sewage pipe network and treated uniformly by urban sewage treatment plants. This mode has the characteristics of low investment, short construction period, quick results, and convenient unified management. It not only saves investment in sewage treatment facilities in rural areas, but also the sewage is uniformly treated by urban sewage treatment plants, with good sewage treatment effects and operation management guarantees. The contiguous centralized treatment mode, for villages with relatively concentrated populations and lack of surrounding land for consumption, on the basis of collecting scattered household sewage, discharges farmers' sewage to the village group public drainage system, and then discharges it to the centralized sewage treatment system for treatment. It is mainly aimed at the central villages, settlements or natural villages with concentrated populations in contiguous areas, and builds supporting pipe network collection systems to collect the sewage generated by farmers in a centralized manner, and centrally builds sewage treatment facilities between administrative villages to treat village domestic sewage. The centralized collection and treatment of village sewage should be adapted to local conditions, with flexible arrangements and prudent decisions. The decentralized treatment mode for farmers collects the sewage from farmers in a joint or single household and then treats it separately. This treatment mode has the characteristics of flexible layout, saving pipe network laying costs, and simple construction. It is suitable for villages where farmers live in scattered areas, the terrain conditions are complex, the construction is difficult, and sewage is not easy to collect in a centralized manner.

[0004] Among them, the decentralized treatment model has become the first choice for farmers' governance model due to its low cost and relatively low subsequent operation and maintenance. However, the decentralized treatment model still has the following problems: ① Rural domestic sewage mainly includes toilet drainage and kitchen drainage. The high-concentration sewage discharged from the toilet is mixed with the oily and slag-containing sewage discharged from the kitchen and enters the septic tank, which cannot achieve the purpose of harmlessness, reduction and removal of oil pollution; ② The mixed entry of sewage also leads to a small volume of the septic tank, which makes the septic tank sewage directly discharged, polluting the environment and affecting subsequent resource utilization; ③ The treated tail water needs to be transported to the receiving water body through a water pipe, and the construction investment cost is high; when the receiving water body is far away or the terrain is high, power lifting is required, resulting in high operation and maintenance costs; when the operation and maintenance responsibility entity is unclear and the operation cost is not guaranteed, the operation rate of the sewage treatment facility will be low; ④ The overflow or random discharge of sewage that cannot be absorbed by the land also affects the surrounding water environment. Summary of the invention

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a system for treating and recycling domestic sewage for farmers, which solves the problem of environmental pollution caused by the random discharge of domestic sewage from farmers or the high cost of building sewage pipes for centralized treatment, and realizes the resource utilization of domestic sewage. The present application provides the following technical solutions:

[0006] A system for treating and recycling domestic sewage for farmers, comprising an oil and slag separation tank, a three-stage purification tank, a resource utilization storage tank, an irrigation system and an artificial wetland;

[0007] One side of the grease and slag separation tank is used to collect sewage discharged from the kitchen, and the other side of the grease and slag separation tank is connected to the resource utilization storage tank. One side of the three-stage purification tank is used to collect sewage discharged from the toilet, and the other side of the three-stage purification tank is connected to the resource utilization storage tank.

[0008] The resource utilization storage tank is connected to the irrigation system and the artificial wetland respectively, so that the sewage treated by the resource utilization storage tank is connected to the irrigation system and the artificial wetland.

[0009] As an alternative or supplement to the above-mentioned domestic sewage treatment and resource utilization system for farmers, the resource utilization storage tank includes a sedimentation area, an anaerobic area and a storage area arranged in sequence, the sedimentation area receives sewage from the oil and slag separation tank or the tertiary purification tank, and the storage area is respectively connected to the irrigation system and the artificial wetland.

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

[0011] As an alternative or supplement to the above-mentioned domestic sewage treatment and resource utilization system for farmers, the solar micro-power 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 arranged in the resource utilization storage pool. The solar system water pump extracts the sewage treated in the resource utilization storage pool and irrigates it to the farmland through the power water pipe. The solar panel is arranged on one side of the resource utilization storage pool, and the solar panel is connected to the control cabinet and the solar system water pump in sequence.

[0012] As an alternative or supplement to the above-mentioned domestic sewage treatment and resource utilization system for farmers, aquatic plants are planted on the artificial wetland.

[0013] As an alternative or supplement to the above-mentioned domestic sewage treatment and resource utilization system for farmers, a soil ditch is arranged on the side of the artificial wetland away from the resource utilization storage tank, and the water treated in the artificial wetland is discharged to the soil ditch.

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

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

[0016] The present invention improves the existing domestic sewage treatment mode of scattered rural households, and designs an oil-separating and slag-separating tank, a three-stage purification tank, a resource utilization storage tank, an irrigation system and an artificial wetland respectively, so that the high-concentration sewage discharged from the toilet and the oil-containing and slag-containing sewage discharged from the kitchen are collected and treated separately. The toilet sewage first enters the three-stage purification tank for harmlessness and reduction, and the kitchen sewage first enters the oil-separating and slag-separating tank for oil, water and slag separation, so that different types of sewage can take appropriate pretreatment measures, improve the pollutant removal efficiency, and solve the problem of sewage mixing into the septic tank and sewage overflowing and discharging to pollute the environment;

[0017] At the same time, toilet sewage and kitchen sewage are treated as above and then enter the resource utilization storage tank for sedimentation and anaerobic treatment before storage. The stored sewage can be used for resource utilization in nearby farmland, vegetable fields and forest land, alleviating the problem of water resource waste. At the same time, the treated tail water is used for irrigation, saving the construction investment cost of tail water transportation.

[0018] Furthermore, the irrigation system is selected based on the distance and terrain of the vegetable fields, farmland and other absorbing lands around the farmers. When there are farmland, vegetable fields and forests nearby, a gravity irrigation system is used; when the farmland, vegetable fields and forests are high or far away, the treated water cannot flow by itself, so a solar micro-power irrigation system is used. Gravity or solar micro-power greatly reduces operating costs, increases farmers' enthusiasm for participating in operation and maintenance, and effectively solves the problem of long-term operation of rural sewage facilities;

[0019] Finally, the excess water absorbed by the land enters the ecological treatment process - after deep treatment in artificial wetlands and meeting the standards, it enters the soil ditch, infiltrates or flows into nearby existing ditches to replenish surface and groundwater, thus building a sustainable and healthy water circulation system.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the process structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the planar layout of the present invention.

[0024] Figure numerals: 1-oil and slag separation tank; 2-third-stage purification tank; 3-resource utilization storage tank; 4-gravity self-flow irrigation system; 5-solar micro-power irrigation system; 6-artificial wetland; 7-soil ditch; 8-sedimentation area; 9-anaerobic area; 10-storage area; 11-solar system water pump; 12-control cabinet; 13-solar panel; 14-aquatic plants. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Please refer to Figure 1-2 As shown, the present embodiment provides a domestic sewage treatment and resource utilization system for farmers, comprising a grease and slag separation tank 1, a tertiary purification tank 2, a resource utilization storage tank 3, an irrigation system and an artificial wetland 6; one side of the grease and slag separation tank 1 is used to collect sewage discharged from the kitchen, and the other side of the grease and slag separation tank 1 is connected to the resource utilization storage tank 3, one side of the tertiary purification tank 2 is used to collect sewage discharged from the toilet, and the other side of the tertiary purification tank 2 is connected to the resource utilization storage tank 3; the resource utilization storage tank 3 is respectively connected to the irrigation system and the artificial wetland 6, so that the sewage treated in 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 area 8, an anaerobic area 9 and a storage area 10 which are arranged in sequence. The sedimentation area 8 receives sewage from the oil and slag separation tank or the tertiary purification tank 2. The storage area 10 is connected to the irrigation system and the artificial wetland 6 respectively.

[0030] Aquatic plants are planted on the artificial wetland 6; a soil ditch is arranged on one side of the artificial wetland 6 away from the resource utilization storage pool 3, and water treated by the artificial wetland 6 is discharged to the soil ditch.

[0031] In the above embodiment, if Figure 1 Shown is a schematic diagram of the process structure of the present invention, Figure 2The schematic diagram of the plane layout of the present invention is shown. The domestic sewage treatment and resource utilization system for farmers of the present invention includes five major components: an oil-separating and slag-separating tank 1, a three-stage purification tank 2, a resource utilization storage tank 3, an irrigation system and an artificial wetland 6. They are connected by water pipes. The kitchen sewage generated by farmers enters the oil-separating and slag-separating tank 1, and the kitchen sewage is separated into oil, water and slag in the oil-separating and slag-separating tank 1. The principle of the oil-separating and slag-separating tank is to use the density difference of oil, water and slag to separate oil, water and slag by gravity separation. The working principle of the oil-separating and slag-separating tank 1 is mainly divided into two steps: pretreatment and separation. First, the wastewater enters the oil-separating and slag-separating tank 1 through the water inlet. During the pretreatment process, large particles of solid matter in the wastewater will settle to the bottom, while grease will float on the water surface. After pretreatment, the wastewater enters the separation stage. In the separation stage, the wastewater passes through the oil separator, slag separator, etc., and the grease and solid particles are further separated. The function of the oil separator is to adjust the water flow speed and direction so that the grease forms a thin film in the water and flows downward along the board surface. The oil collecting trough on the oil separator collects the grease. The slag separator blocks the solid particles and makes them settle to the bottom, thereby achieving solid-liquid separation. The separated sewage enters the next-level resource utilization storage pool 3, and the toilet sewage generated by farmers enters the three-level purification pool 2. The toilet sewage is harmlessly treated and reduced in the three-level purification pool 2. The toilet sewage enters the first pool of the three-level purification pool 2 from the water inlet. The sewage and feces in the pool begin to ferment and decompose. Due to different specific gravities, the sewage can naturally be divided into three layers, the upper layer is a paste-like skin, the lower layer is a block or granular slag, and the middle layer is a relatively clear liquid. The upper skin and the lower layer of slag contain the most bacteria and parasite eggs, and the middle layer contains the least eggs. The preliminary fermented middle layer liquid overflows to the second pool, while most of the skin and slag that have not been fully fermented are retained in the first pool for continued fermentation. The liquid flowing into the second pool is further fermented and decomposed, the eggs continue to sink, the pathogens gradually die, the sewage is further harmless, and the thickness of the skin and slag produced is significantly reduced compared to the first pool.The sewage flowing into the third pool is generally already decomposed, and the pathogens and parasite eggs have been basically killed. The third pool of the tertiary purification pool 2 mainly serves to store the sewage that has been basically rendered harmless. The treated sewage also flows into the next-level resource utilization storage pool 3. The resource utilization storage pool 3 is divided into three compartments, namely the sedimentation area 8, the anaerobic area 9 and the storage area 10. The sewage is once again precipitated and anaerobically treated in the resource utilization storage pool 3. Specifically, when the sewage enters the first sedimentation tank of the resource utilization storage pool 3, most of the solid impurities and sediments will be deposited at the bottom of the pool to form a sludge layer, and the clean water on the upper layer will flow into the first through the inlet and outlet. Two-grid anaerobic tank: In the second anaerobic tank, some anaerobic bacteria will decompose organic matter in the sewage to produce methane, hydrogen, carbon dioxide and other gases, which will rise to form a bubble layer, while the clean water in the lower layer will flow into the third storage tank through the inlet and outlet. The treated sewage is temporarily stored in the storage area 10. When the surrounding vegetable fields, farmland and other absorbing land need to be irrigated, they are irrigated through the irrigation system. The excess water in the storage area 10 enters the artificial wetland 6 for further purification. The treated water in the artificial wetland 6 is discharged into the soil ditch 7 and merged into the nearby existing ditch to replenish surface and groundwater, thus building a sustainable and healthy water circulation system.

[0032] The artificial wetland 6 in this embodiment adopts a horizontal submerged flow type with bottom inlet and top outlet. Aquatic plants 14 are planted on the artificial wetland 6. The aquatic plants 14 are selected according to the local climate. It is advisable to use plants with high survival rate, strong water resistance, long growth cycle, and the ability to fully remove organic matter in sewage, such as canna, etc. The density is 25 plants / square meter.

[0033] In an alternative to the above embodiment, the irrigation system includes a solar micro-power irrigation system 5 and a gravity self-flow irrigation system 4, wherein the solar micro-power irrigation system 5 extracts the sewage treated by the resource utilization storage tank 3 to irrigate the farmland, and the gravity self-flow irrigation system 4 includes a gravity 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 micro-power 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 arranged in the resource utilization storage pool 3. The solar system water pump 11 extracts the sewage treated by the resource utilization storage pool 3 and irrigates the farmland through the power water pipe. The solar panel 13 is arranged on one side of the resource utilization storage pool 3, and the solar panel 13 is connected to the control cabinet 12 and the solar system water pump 11 in sequence.

[0035] In this alternative solution, the irrigation system can select a gravity self-flow irrigation system 4 or a solar micro-power irrigation system 5 according to the distance and terrain conditions of the vegetable fields, farmlands and other absorbing lands around the farmers. When there are farmlands, vegetable fields and forests nearby, the gravity self-flow irrigation system 4 is selected; when the farmlands, vegetable fields and forests are at a higher or farther terrain, the treated water cannot flow by itself and the solar micro-power irrigation system 5 is used. When the solar micro-power irrigation system 5 is selected, a solar system water pump 11 is installed at the bottom of the storage area 10 of the resource utilization storage pool 3, and the water enters the solar micro-power irrigation system 5 through the solar system water pump 11. In order to realize the solar micro-power irrigation system 5, a control cabinet 12 is also required; a solar panel 13, the solar panel 13 adopts a solar photovoltaic panel, which has a long service life.

[0036] In the alternative scheme of the above embodiment, the oil and slag separation tank 1, the tertiary purification tank 2 and the resource utilization storage tank 3 are made of glass fiber reinforced plastics, and they are connected to each other through PVC water pipes.

[0037] In this alternative scheme, the oil-separating and slag-trapping pool 1, the tertiary purification pool 2 and the resource utilization storage pool 3 are made of integral fiberglass, and the connecting water pipes are made of PVC pipes. In a possible embodiment, the present invention can have three types according to the number of households collecting sewage, namely, one household, two-three households and four-six households. For example, when the number of households collecting sewage is one household, the effective volume of the oil-separating and slag-trapping pool 1 and the tertiary purification pool 2 is one cubic meter, the effective volume of the resource utilization storage pool 3 is two cubic meters, and the planting area of ​​the artificial wetland 6 is one cubic meter; when the number of households collecting sewage is two-three households, the effective volume of the oil-separating and slag-trapping pool 1 and the tertiary purification pool 2 is three cubic meters, the effective volume of the resource utilization storage pool 3 is four cubic meters, and the planting area of ​​the artificial wetland 6 is three cubic meters; when the number of households collecting sewage is four-six households, the effective volume of the oil-separating and slag-trapping pool 1 and the tertiary purification pool 2 is five cubic meters, the effective volume of the resource utilization storage pool 3 is six cubic meters, and the planting area of ​​the artificial wetland 6 is six cubic meters. Reasonable settings are made according to different situations.

[0038] Therefore, the present invention closely combines the actual situation of farmers, skillfully combines sewage treatment with resource utilization, and mainly adopts the "single-household or joint-household oil and slag separation pool 1 / three-stage purification pool 2+resource utilization storage pool 3+gravity self-flow irrigation system 4 / solar energy micro-power irrigation system 5+artificial wetland 6" model to scientifically and rationally design resource utilization facilities such as resource utilization storage pool 3 and solar energy micro-power irrigation system 5. The treated tail water is scientifically selected according to the surrounding environment, such as vegetable fields, gardens, orchards, fields, etc., and is utilized locally. The remaining water from 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 to the existing ditch nearby for surface water and groundwater replenishment.

[0039] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A system for treating and recycling domestic sewage for farmers, characterized in that: It includes oil and slag separation tank, tertiary purification tank, resource utilization storage tank, irrigation system and artificial wetland; One side of the grease and slag separation tank is used to collect sewage discharged from the kitchen, and the other side of the grease and slag separation tank is connected to the resource utilization storage tank. One side of the three-stage purification tank is used to collect sewage discharged from the toilet, and the other side of the three-stage purification tank is connected to the resource utilization storage tank. The resource utilization storage tank is connected to the irrigation system and the artificial wetland respectively, so that the sewage treated by the resource utilization storage tank is connected to the irrigation system and the artificial wetland.

2. The system for treating and recycling domestic sewage for farmers according to claim 1 is characterized in that: The resource utilization storage tank includes a sedimentation area, an anaerobic area and a storage area which are arranged in sequence. The sedimentation area receives sewage from the oil and slag separation tank or the tertiary purification tank. The storage area is respectively connected to the irrigation system and the artificial wetland.

3. The system for treating and recycling domestic sewage for farmers according to claim 1 is characterized in that: The irrigation system includes a solar micro-power irrigation system and a gravity-flow irrigation system. The solar micro-power irrigation system extracts the sewage treated by the resource utilization storage tank and irrigates the farmland. The gravity-flow irrigation system includes a gravity 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.

4. The system for treating and recycling domestic sewage for farmers according to claim 3 is characterized in that: The solar micro-power 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 arranged in the resource utilization storage pool. The solar system water pump extracts the sewage treated in the resource utilization storage pool and irrigates the farmland through the power water pipe. The solar panel is arranged on one side of the resource utilization storage pool, and the solar panel is connected to the control cabinet and the solar system water pump in sequence.

5. The system for treating and recycling domestic sewage for farmers according to claim 1 is characterized in that: Aquatic plants are planted on the artificial wetland.

6. The system for treating and recycling domestic sewage for farmers according to claim 1 is characterized in that: A soil ditch is arranged on one side of the artificial wetland away from the resource utilization storage pool, and water treated by the artificial wetland is discharged to the soil ditch.

7. The system for treating and recycling domestic sewage for farmers according to claim 1 is characterized in that: The oil and slag separation tank, the three-stage purification tank and the resource utilization storage tank are made of glass fiber reinforced plastics, and are connected to each other through PVC water pipes.

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