Rural domestic sewage treatment system and usage method

Abstract

The present application relates to a rural domestic sewage treatment system, in which the farmer's gray water sewage pipe is connected to the inlet pipe of the sedimentation tank, the outlet pipe of the sedimentation tank is connected to the inlet pipe of the gray water treatment tank, the outlet pipe of the gray water treatment tank is connected to the inlet pipe of the reclaimed water collection unit, the farmer's black water sewage pipe is connected to the inlet pipe of the septic tank, the outlet pipe of the septic tank is connected to the inlet pipe of the black water treatment tank, the outlet pipe of the black water treatment tank is connected to the inlet pipe of the reclaimed water collection unit, the outlet pipe of the reclaimed water collection unit is connected to the inlet pipe of the artificial wetland, and the farmer's reclaimed water use pipe is connected to the outlet pipe of the reclaimed water collection unit. The above solution can solve the problem in the related art that aquatic wetlands and ponds are limited by climate temperature and have low temperatures, which affects the normal treatment of sewage. Even if the generated reclaimed water enters the oxidation pond, it only increases the water volume in the oxidation pond, resulting in poor reclaimed water utilization.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a rural domestic sewage treatment system and a use method thereof. Background Art

[0002] Rural domestic sewage treatment is a key measure for improving the rural living environment, implementing the rural revitalization strategy, and an inherent requirement for building a moderately prosperous society in all respects. The guiding principles of rural sewage treatment are source reduction, resource utilization, pollution and carbon reduction, and ecological restoration. Rural sewage generally consists of graywater and blackwater. Graywater refers to low-concentration domestic sewage, such as water used in the kitchen, laundry, and washing (excluding toilet flushing); blackwater generally refers to high-concentration domestic sewage used to flush feces in toilets. However, rural residential areas are relatively dispersed, and the average daily water consumption per household is relatively low, making centralized collection and treatment of rural sewage difficult.

[0003] The continuous construction of the "New Countryside" has led to the relative concentration of rural residential areas, providing the possibility for centralized treatment of rural sewage. This has led to the emergence of a variety of rural domestic sewage treatment methods and equipment. Among them, constructed wetlands are a relatively low-cost and widely used rural sewage treatment method. For example, Chinese invention patent number CN201110193783.6 discloses a constructed wetland rural sewage treatment method and system. Domestic sewage is treated as wastewater in a multi-compartment septic tank; the wastewater enters a screen well and a water collection well to form a blended water; the blended water enters a biofilter where it is treated with high-efficiency microbial agents and biofilter materials to remove organic matter from the water. The water is then purified and absorbed by wetland plants to form living water; the living water enters a composite constructed wetland to further remove residual nitrogen and phosphorus compounds, forming reclaimed water; the reclaimed water then enters an oxidation pond where the organic matter and nutrients in the water are degraded and purified through the material transformation of multiple food chains, and finally the water meets the standards for recovery or discharge.

[0004] However, in northern China, aquatic wetlands and ponds are subject to temperature restrictions, and their metabolic activity is only active from April to November each year. Especially in winter, when the temperature is low, the water in the equipment may freeze, affecting the normal treatment of sewage. In addition, the high-efficiency microorganisms in the biological filter are less active at low temperatures, resulting in a lower generation rate of reclaimed water. At the same time, even if the generated reclaimed water is discharged into the oxidation pond, it can only increase the water volume of the oxidation pond, resulting in poor use of the reclaimed water. Summary of the Invention

[0005] Based on this, it is necessary to address the problem that aquatic wetlands and ponds in related technologies are subject to temperature restrictions of the climate and have low temperatures, which affects the normal treatment of sewage. Even if the generated reclaimed water enters the oxidation pond again, it can only increase the water volume in the oxidation pond, resulting in poor use of reclaimed water.

[0006] A rural domestic sewage treatment system includes a grit chamber, a gray water treatment tank, a septic tank, a black water treatment tank, a reclaimed water storage unit and an artificial wetland. The farmer's gray water sewage pipeline is connected to the water inlet pipeline of the grit chamber, the outlet pipeline of the grit chamber is connected to the water inlet pipeline of the gray water treatment tank, the outlet pipeline of the gray water treatment tank is connected to the water inlet pipeline of the reclaimed water storage unit, the farmer's black water sewage pipeline is connected to the water inlet pipeline of the septic tank, the outlet pipeline of the septic tank is connected to the water inlet pipeline of the black water treatment tank, the outlet pipeline of the black water treatment tank is connected to the water inlet pipeline of the reclaimed water storage unit, the outlet pipeline of the reclaimed water storage unit is connected to the water inlet pipeline of the artificial wetland, and the farmer's reclaimed water pipeline is connected to the outlet pipeline of the reclaimed water storage unit.

[0007] Preferably, in the above-mentioned rural domestic sewage treatment system, the black water treatment pool is provided with an empty cavity and a treatment cavity in sequence along the direction of gravity, and the permafrost layer and the treatment cavity are arranged in sequence along the direction of gravity, and the treatment cavity is provided with an attachment layer, and anaerobic microorganisms are attached to the attachment layer.

[0008] Preferably, in the above-mentioned rural domestic sewage treatment system, the treatment chamber is divided into an anaerobic space and a filtration space, the vacant chamber is connected to the anaerobic space, the attachment layer is arranged in the anaerobic space, the anaerobic space is connected to the filtration space, the filtration space is provided with a filter material layer, and aerobic microorganisms are attached to the filter material layer.

[0009] Preferably, in the above-mentioned rural domestic sewage treatment system, the grey water collection part includes N levels of first water storage wells arranged in sequence, and the first water storage well includes at least one grey water storage tank; wherein, a grey water overflow pipe is provided on the upper part of the grey water storage tank of the i-1th level, and the grey water overflow pipe is connected to the grey water storage tank of the i-1th level; a return pipe is provided at the bottom of the grey water storage tank of the i-th level, and the return pipe is connected to the grey water storage tank of the i-1th level; a check assembly is provided on the return pipe, which only allows fluid to flow from the grey water storage tank of the i-th level to the grey water storage tank of the i-1th level, wherein N is an integer ≥2, i is an integer ≥2 and ≤N, and the grey water storage tank of the first level is provided with a grey water outlet pump, and the outlet end of the grey water outlet pump is connected to the water inlet pipeline of the artificial wetland and the grey water use pipeline of the farmer.

[0010] Preferably, in the above rural domestic sewage treatment system, the number of the first water storage wells at the i-th level is at least one.

[0011] Preferably, in the above-mentioned rural domestic sewage treatment system, at least one multifunctional auxiliary pipe is provided in the middle of the grey water storage tank, the multifunctional auxiliary pipe connects the grey water storage tanks of two adjacent levels, and a cut-off component is provided on the multifunctional auxiliary pipe.

[0012] Preferably, in the above-mentioned rural domestic sewage treatment system, the rural domestic sewage treatment system also includes a clean water storage tank and a vegetable greenhouse, the farmer's household's grey water use pipeline and the vegetable greenhouse's irrigation pipeline are both connected to the outlet pipeline of the grey water collection part, the outlet pipeline of the artificial wetland is connected to the inlet pipeline of the clean water storage tank, the outlet pipeline of the clean water storage tank is connected to the farmer's household's clean water use pipeline, and the outlet pipeline of the clean water storage tank is connected to the irrigation pipeline of the vegetable greenhouse.

[0013] Preferably, in the above-mentioned rural domestic sewage treatment system, the irrigation pipeline of the vegetable greenhouse and the clean water use pipeline of the farmer are both connected to the outlet pipeline of the clean water storage tank.

[0014] Preferably, in the above-mentioned rural domestic sewage treatment system, the rural domestic sewage treatment system also includes a greenhouse artificial wetland, the outlet pipe of the reclaimed water storage part is connected to the inlet pipe of the greenhouse artificial wetland, and the outlet pipe of the greenhouse artificial wetland is connected to the inlet pipe of the clean water storage tank.

[0015] Based on the rural domestic sewage treatment system disclosed in the embodiments of the present application, a method for using the rural domestic sewage treatment system is also disclosed. The rural domestic sewage treatment system involved is the rural domestic sewage treatment system described in the embodiments above. The method for using the rural domestic sewage treatment system includes:

[0016] Step 101: treating the gray water transported by the farmer's gray water drainage pipeline in the gray water treatment pool and the black water transported by the farmer's black water drainage pipeline in the black water treatment pool to obtain reclaimed water, which is stored in the reclaimed water storage unit;

[0017] Step 102: Obtaining the growth status of the crops planted in the artificial wetland;

[0018] Step 103: When the growth state is the metabolic stage, the reclaimed water storage unit drives the reclaimed water to the artificial wetland, the reclaimed water use pipeline of the farmer, and the irrigation pipeline of the vegetable greenhouse. The artificial wetland processes part of the reclaimed water to obtain first clean water, and the first clean water is stored in a clean water storage tank.

[0019] Step 104: When the growth state is a non-metabolic period, the grey water collection unit drives the grey water to the greenhouse artificial wetland, the farmer's grey water use pipeline and the vegetable greenhouse irrigation pipeline, and the greenhouse artificial wetland processes part of the grey water to obtain second clean water, which is stored in a clean water storage tank.

[0020] The technical solution adopted in this application can achieve the following beneficial effects:

[0021] In a rural domestic sewage treatment system disclosed in an embodiment of the present application, the farmer's gray water sewage pipeline is connected to the inlet pipeline of the grit tank, the outlet pipeline of the grit tank is connected to the inlet pipeline of the gray water treatment tank, the outlet pipeline of the gray water treatment tank is connected to the inlet pipeline of the reclaimed water storage unit, the farmer's black water sewage pipeline is connected to the inlet pipeline of the septic tank, the outlet pipeline of the septic tank is connected to the inlet pipeline of the black water treatment tank, the outlet pipeline of the black water treatment tank is connected to the inlet pipeline of the reclaimed water storage unit, the outlet pipeline of the reclaimed water storage unit is connected to the inlet pipeline of the artificial wetland, and the farmer's reclaimed water use pipeline is connected to the outlet pipeline of the reclaimed water storage unit. In the above structure, the storage of reclaimed water obtained from the gray water treatment pool and the black water treatment pool is realized through the reclaimed water storage unit. At the same time, farmers can flexibly control the use of reclaimed water according to the status of plants in the artificial wetland. When the crops in the artificial wetland are in a state of vigorous metabolism, the reclaimed water storage unit can drive the reclaimed water to flow to the artificial wetland, and the artificial wetland can process the reclaimed water; when the crops in the artificial wetland are in a state of non-vigorous metabolism, since the farmer's reclaimed water use pipeline is connected to the outlet pipeline of the reclaimed water storage unit, the reclaimed water storage unit can drive the reclaimed water to flow to the farmer's reclaimed water use pipeline, and the farmer can use the reclaimed water to flush toilets, clean the courtyard, water flowers, etc., thereby avoiding the waste of reclaimed water by only transporting reclaimed water to artificial wetlands, oxidation ponds, etc. where crops are in a state of non-vigorous metabolism, thereby improving the use effect of reclaimed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a rural domestic sewage treatment system disclosed in an embodiment of the present application;

[0023] Figure 2 A cross-sectional view of the first water storage well disclosed in an embodiment of the present application;

[0024] Figure 3 for Figure 2 A partial enlarged view of section A shown;

[0025] Figure 4 A cross-sectional view of a black water treatment tank disclosed in an embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the cutoff component structure disclosed in an embodiment of the present application.

[0027] Among them: grit chamber 100, main storage tank 210-1, auxiliary storage tank 210-2, tertiary storage tank 210-3, reclaimed water outlet pump 211, reclaimed water overflow pipe 212, return pipe 213, check assembly 214, receiving part 2141, check gate 2142, auxiliary float 2143, multi-functional auxiliary pipe 215, cut-off assembly 216, cut-off part 2161, gray water treatment tank 300, septic tank 400, black water treatment tank 500, vacant cavity 510, treatment cavity 520, anaerobic space 521, filtration space 522, filter material layer 523, attachment layer 530, artificial wetland 600, permafrost layer 700, clean water storage tank 800, vegetable greenhouse 900, greenhouse artificial wetland 1000. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "bottom end," "top end," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please refer to Figures 1 to 5 The present application discloses a rural domestic sewage treatment system, which includes a grit chamber 100, a gray water treatment tank 300, a septic tank 400, a black water treatment tank 500, a reclaimed water storage unit and an artificial wetland 600.

[0032] The grit chamber 100 is used to precipitate impurities such as sand and hair in the gray water output by farmers, and the gray water treatment tank 300 is used to treat the gray water transported from the grit chamber 100 to obtain reclaimed water. The gray water treatment tank 300 can effectively remove organic matter, nitrogen, phosphorus, etc. in the gray water through a combination of filtration methods (including gravel filtration module, bark filtration module, steel slag filtration module, coarse sand filtration module, fine sand filtration module, modified straw adsorbent filtration module, and pebble filtration module, etc.), or, the gray water can be treated with gray water treatment agents such as polyaluminum chloride to obtain reclaimed water, and this application does not impose any restrictions on this. The septic tank 400 is used to treat the black water output by farmers and filter and precipitate it. The black water treatment tank 500 is used to treat the black water transported from the septic tank 400 to obtain reclaimed water. The black water treatment tank 500 can treat the black water by combining anaerobic and aerobic organisms to obtain reclaimed water, or it can also treat the black water by MBBR sewage treatment technology to obtain reclaimed water. This application does not impose any restrictions on this. The artificial wetland 600 can treat the reclaimed water transported from the gray water treatment tank 300 and the black water treatment tank 500 to obtain clean water.

[0033] Specifically, the farmer's gray water sewage pipeline is connected to the inlet pipeline of the grit tank 100, the outlet pipeline of the grit tank 100 is connected to the inlet pipeline of the gray water treatment tank 300, the outlet pipeline of the gray water treatment tank 300 is connected to the inlet pipeline of the reclaimed water storage section, the farmer's black water sewage pipeline is connected to the inlet pipeline of the septic tank 400, the outlet pipeline of the septic tank 400 is connected to the inlet pipeline of the black water treatment tank 500, the outlet pipeline of the black water treatment tank 500 is connected to the inlet pipeline of the reclaimed water storage section, the outlet pipeline of the reclaimed water storage section is connected to the inlet pipeline of the artificial wetland 600, and the farmer's reclaimed water use pipeline is connected to the outlet pipeline of the reclaimed water storage section.

[0034] During the use of the rural domestic sewage treatment system, farmers use their gray water and black water drainage pipelines to transport the sewage to the grit chamber 100 and septic tank 400 respectively. The grit chamber 100 precipitates impurities such as sand and hair in the gray water discharged by farmers, and the gray water treatment tank 300 treats the gray water to obtain reclaimed water. At the same time, the septic tank 400 treats the black water discharged by farmers and filters and precipitates it. The black water treatment tank 500 treats the black water to obtain reclaimed water. The gray water treatment tank 300 The black water treatment pool 500 transports the grey water to the grey water storage section. When the crops in the artificial wetland 600 are in a state of vigorous metabolism, the grey water storage section can drive the grey water to flow to the artificial wetland 600, and the artificial wetland 600 can process the grey water. When the crops in the artificial wetland 600 are in a state of non-vigorous metabolism, since the farmer's grey water use pipeline is connected to the outlet pipeline of the grey water storage section, the grey water storage section can drive the grey water to flow to the farmer's grey water use pipeline.

[0035] In a rural domestic sewage treatment system disclosed in an embodiment of the present application, the farmer's gray water sewage pipeline is connected to the inlet pipeline of the grit chamber 100, the outlet pipeline of the grit chamber 100 is connected to the inlet pipeline of the gray water treatment tank 300, the outlet pipeline of the gray water treatment tank 300 is connected to the inlet pipeline of the reclaimed water storage unit, the farmer's black water sewage pipeline is connected to the inlet pipeline of the septic tank 400, the outlet pipeline of the septic tank 400 is connected to the inlet pipeline of the black water treatment tank 500, the outlet pipeline of the black water treatment tank 500 is connected to the inlet pipeline of the reclaimed water storage unit, the outlet pipeline of the reclaimed water storage unit is connected to the inlet pipeline of the artificial wetland 600, and the farmer's reclaimed water use pipeline is connected to the outlet pipeline of the reclaimed water storage unit. In the above structure, the storage of the reclaimed water obtained by the gray water treatment tank 300 and the black water treatment tank 500 is realized through the reclaimed water storage part. At the same time, farmers can flexibly control the use of reclaimed water according to the status of plants in the artificial wetland 600. When the crops in the artificial wetland 600 are in a state of vigorous metabolism, the reclaimed water storage part can drive the reclaimed water to flow to the artificial wetland 600, and the artificial wetland 600 can treat the reclaimed water; when the crops in the artificial wetland 600 are in a state of non-vigorous metabolism, since the farmer's reclaimed water use pipeline is connected to the outlet pipeline of the reclaimed water storage part, the reclaimed water storage part can drive the reclaimed water to flow to the farmer's reclaimed water use pipeline, and the farmer can use the reclaimed water to flush toilets, clean the courtyard, water flowers, etc., thereby avoiding the waste of reclaimed water by only transporting reclaimed water to the artificial wetland 600, oxidation pond, etc. where the crops are in a non-vigorous metabolic state, thereby improving the use effect of reclaimed water.

[0036] In an embodiment of the present application, the black water treatment pool 500 is provided with an empty cavity 510 and a treatment cavity 520 in sequence along the direction of gravity. Specifically, along the direction of gravity, the permafrost layer 700 and the treatment cavity 520 can be arranged in sequence, and the treatment cavity 520 can be provided with an attachment layer 530, and anaerobic microorganisms can be attached to the attachment layer 530, wherein the anaerobic microorganisms can decompose organic matter in the black water.

[0037] In the above structure, in order to prevent the activity of anaerobic microorganisms from being affected by temperature due to the low surface ambient temperature, the frozen soil layer 700 and the processing chamber 520 are arranged in sequence along the gravity direction, which is conducive to ensuring the activity of anaerobic microorganisms.

[0038] In a further technical solution, the processing chamber 520 can be divided into an anaerobic space 521 and a filtration space 522. Specifically, the empty chamber 510 can be connected to the anaerobic space 521, the attachment layer 530 can be arranged in the anaerobic space 521, the anaerobic space 521 can be connected to the filtration space 522, the filtration space 522 can be provided with a filter layer 523, and the filter layer 523 can be attached with aerobic microorganisms. In the presence of oxygen, the aerobic microorganisms further degrade organic matter through biological metabolism.

[0039] In an embodiment of the present application, the grey water storage section may include N levels of first water storage wells arranged in sequence, specifically, the first water storage well includes at least one grey water storage tank; wherein, a grey water overflow pipe 212 is provided on the upper part of the i-1th level grey water storage tank, and the grey water overflow pipe 212 is connected to the i-1th level grey water storage tank; a return pipe 213 is provided at the bottom of the i-1th level grey water storage tank, and the return pipe 213 is connected to the i-1th level grey water storage tank; a check assembly 214 is provided on the return pipe 213, which only allows the fluid to flow from the i-th level grey water storage tank to the i-1th level grey water storage tank, wherein N is an integer ≥2, i is an integer ≥2 and ≤N, and the first-level grey water storage tank is provided with a grey water outlet pump 211, and the outlet end of the grey water outlet pump 211 is connected to the water inlet pipeline of the artificial wetland 600 and the grey water use pipeline of the farmers.

[0040] During the operation of the rural domestic sewage treatment system, in summer or autumn, when the average temperature is high and plants are in their active metabolic period, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the constructed wetland 600. Through physical, biological, and chemical processes, the ammonia nitrogen and phosphorus content in the reclaimed water is reduced before being discharged or recycled for reuse. In winter and spring, when the average temperature is low and plants are in a period of slow or no metabolic process, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the reclaimed water storage tank for storage. After the temperature rises and plant metabolism resumes, the reclaimed water stored in the reclaimed water storage tank is sent to the constructed wetland 600 for treatment and discharge or recycling for reuse. By setting up a greywater storage pool, greywater can be temporarily stored when the average temperature is low and plant metabolism is inactive. The greywater can be recycled back to farmers for use and then centrally treated when the temperature rises and plant metabolism is active. This effectively solves the problem of the artificial wetland 600 not being able to operate normally in northern China due to the influence of temperature and plant growth cycles, ensures the treatment effect of greywater, and ensures that rural wastewater is treated to meet standards.

[0041] For example, the greywater storage tanks are divided into a main storage tank 210-1, at least one auxiliary storage tank 210-2, and at least one tertiary storage tank 210-3. The upper portions of the multiple auxiliary storage tanks 210-2 are connected to the main storage tank 210-1 via greywater overflow pipes 212, and the multiple tertiary storage tanks 210-3 are connected to the at least one auxiliary storage tank 210-2 via greywater overflow pipes 212. After rural sewage treatment, greywater is discharged into the main storage tank 210-1. Once the main storage tank 210-1 is full, the greywater is diverted to the auxiliary storage tank 210-2 via the greywater overflow pipes 212. Once the auxiliary storage tank 210-2 is full, the greywater is diverted to the tertiary storage tank 210-3 via the greywater overflow pipes 212.

[0042] In addition, in order to effectively utilize space, the artificial wetland 600 can be stacked on the first water storage well.

[0043] Those skilled in the art will appreciate that, depending on specific circumstances, it may be possible to construct only the primary storage pool 210-1 and the auxiliary storage pool 210-2, without constructing the tertiary storage pool 210-3. Alternatively, a quaternary storage pool, a quintuple storage pool, and so on, may be constructed based on the tertiary storage pool 210-3. Multiple secondary and subsequent tiers of reclaimed water storage pools may be provided to form a reclaimed water storage network.

[0044] In the above-described embodiment, the reclaimed water is sequentially diverted from the nearest primary storage tank 210-1 to the auxiliary storage tank 210-2 and the tertiary storage tank 210-3. On the one hand, only one set of inlet pumps is required, or water intake is directly achieved by gravity, and the pumps do not require excessive lift, thus reducing the number of pumps and their operating time, thereby lowering construction and operating costs. On the other hand, throughout the entire reclaimed water storage process, the reclaimed water in each reclaimed water storage tank is in a state of flow or disturbance, enhancing its fluidity and preventing the long-term stagnant storage of reclaimed water, which could lead to stagnant water and secondary pollution.

[0045] During the storage of reclaimed water, because the reclaimed water level in the main storage tank 210-1 is always higher than that in the auxiliary storage tank 210-2, static pressure prevents the reclaimed water from flowing back into the main storage tank 210-1 through the return pipe 213. During drainage, water can be pumped only from the main storage tank 210-1. When the reclaimed water level in the main storage tank 210-1 drops below that in the auxiliary storage tank 210-2, static pressure causes the reclaimed water in the auxiliary storage tank 210-2 to flow back into the main storage tank 210-1 through the return pipe 213. Similarly, when the level of the reclaimed water storage tank in the previous level drops below that in the next level, the reclaimed water in the next level flows back into the previous level, until the water in the next level is completely drained. Preferably, the bottom of the subsequent grey water storage tank is higher than the bottom of the previous grey water storage tank, so that the grey water in the subsequent grey water storage tank can be completely drained.

[0046] In the above embodiment, by setting the return pipe 213 and the check assembly 214 at the bottom of the grey water storage tank, water can be discharged from one or a few grey water storage tanks, thereby reducing the investment in pump equipment and facilitating the unified treatment of grey water.

[0047] In a preferred embodiment, at least one multifunctional auxiliary pipe 215 is provided in the middle of the grey water storage tank, the multifunctional auxiliary pipe 215 is connected to at least one grey water storage tank close to the water storage well, and a cut-off component 216 is provided on the multifunctional auxiliary pipe 215.

[0048] That is, the upper-level greywater storage tank and the lower-level greywater storage tank are not only connected at the top and bottom, but also have at least one multifunctional auxiliary pipe 215 in the middle for connecting the upper-level greywater storage tank and the lower-level greywater storage tank. Under normal circumstances, the shut-off component 216 is closed, and water cannot flow through the multifunctional auxiliary pipe 215. In one case, in order to promote the flow of water between the greywater storage tanks at each level and prevent the water in the lower-level greywater storage tank from not flowing for a long time and forming stagnant water, causing secondary pollution, the shut-off component 216 is opened in a timely manner to connect the greywater storage tanks of the two adjacent levels, and the water in the upper-level greywater storage tank flows into the lower-level water storage well, replenishing fresh water in the lower-level greywater storage tank. Alternatively, in another embodiment of the present invention, when the water pressure is insufficient to open the check assembly 214, the shut-off component 216 can be opened to divert water in order to introduce the water from the lower-level greywater storage tank into the upper-level greywater storage tank in advance. In another case, when water needs to be taken from the next-level grey water storage tank for use nearby, the cut-off component 216 can be opened so that the water in the previous-level grey water storage tank can be introduced into the next-level grey water storage tank in advance for use nearby.

[0049] In some embodiments, the check valve assembly 214 is a one-way valve. In one preferred embodiment, to facilitate infrastructure construction and reduce construction costs, the check valve assembly 214 includes a receiving member 2141 and a check valve 2142 disposed at the outlet end of the return pipe 213. The upper end of the check valve 2142 is hingedly connected to the receiving member 2141 or the wall of the water storage well, and the check valve 2142 can cover the receiving member 2141. When water is flowing in, the check valve 2142, under its own weight and water pressure, tightly fits against the receiving member 2141, preventing water from entering the next-level gray water storage tank. In the water outlet state, when the liquid level of the upper-level greywater storage tank drops below the liquid level of the lower level, and the back pressure exerted by the water in the lower-level greywater storage tank on the non-return gate 2142 is greater than the sum of the pressure exerted by the water in the upper-level greywater storage tank and the gravity of the non-return gate 2142, the non-return gate 2142 is separated from the receiving part 2141, and the water in the lower-level greywater storage tank flows back to the upper-level greywater storage tank.

[0050] Preferably, to prevent the check gate 2142 from being unable to open smoothly, an auxiliary float 2143 is provided on the check gate 2142. The auxiliary float 2143 forces the check gate 2142 to move away from the receiving member 2141. Under the action of water buoyancy, the check gate 2142 is always subjected to a force moving away from the receiving member 2141. Therefore, when the liquid level of the upper-level gray water storage tank drops below that of the lower-level gray water storage tank, the back pressure does not need to overcome the weight of all the check gates 2142, and the check gate 2142 can be opened, effectively ensuring smooth water flow.

[0051] In one embodiment, the shutoff assembly 216 includes a shutoff gate mounted at the end of the multifunctional auxiliary pipe 215, which can be raised and lowered along the wellbore depth. A shutoff portion 2161 is provided on the shutoff gate, which can cover the end of the multifunctional auxiliary pipe 215. Under normal circumstances, the shutoff portion 2161 covers the end of the multifunctional auxiliary pipe 215. To open the multifunctional auxiliary pipe 215, the shutoff gate is pulled upward, separating the shutoff portion 2161 from the end of the multifunctional auxiliary pipe 215, thereby connecting the upper-level reclaimed water storage tank to the lower-level reclaimed water storage tank.

[0052] In an embodiment of the present application, the rural domestic sewage treatment system may also include a clean water storage tank 800 and a vegetable greenhouse 900. Specifically, the farmer's grey water use pipeline and the vegetable greenhouse 900's irrigation pipeline can be connected to the outlet pipeline of the grey water collection part, the outlet pipeline of the artificial wetland 600 can be connected to the inlet pipeline of the clean water storage tank 800, the outlet pipeline of the clean water storage tank 800 can be connected to the farmer's clean water use pipeline, and the outlet pipeline of the clean water storage tank 800 can be connected to the irrigation pipeline of the vegetable greenhouse 900. In some cases, such as in the summer in northern China, the reclaimed water produced after the treatment of rural sewage is sent to the artificial wetland 600 for further treatment. After treatment, relatively clean water is obtained. This part of the clean water is collected in the clean water storage tank 800 for recycling. For example, since the outlet pipe of the clean water storage tank 800 is connected to the farmer's clean water use pipe, and the outlet pipe of the clean water storage tank 800 is connected to the irrigation pipe of the vegetable greenhouse 900, the farmers can use the clean water of the clean water storage tank 800 for their daily water use, and the irrigation water of the vegetable greenhouse 900 can also use the clean water of the clean water storage tank 800.

[0053] Furthermore, the clean water storage tank 800 is connected to at least one adjacent clean water storage tank 800. That is, at least two of the multiple clean water storage tanks 800 are connected, facilitating the diversion of clean water to areas with high water demand. Preferably, the clean water storage tanks 800 can be connected in a manner similar to that used for the reclaimed water storage tanks to save space and reduce costs.

[0054] In an embodiment of the present application, the rural domestic sewage treatment system may further include a greenhouse artificial wetland 1000. Specifically, the outlet pipeline of the reclaimed water storage unit may be connected to the inlet pipeline of the greenhouse artificial wetland 1000, and the outlet pipeline of the greenhouse artificial wetland 1000 may be connected to the inlet pipeline of the clean water storage tank 800. In some circumstances, such as during the winter in northern China, to prevent excessive reclaimed water in the reclaimed water storage tank, the greenhouse artificial wetland 1000 may be used to treat the reclaimed water, thereby reducing the reserve pressure in the reclaimed water storage tank.

[0055] Based on the rural domestic sewage treatment system disclosed in the embodiments of this application, this application also discloses a method for using the rural domestic sewage treatment system. The rural domestic sewage treatment system involved is the rural domestic sewage treatment system described in the embodiments above. The method for using includes:

[0056] The grey water treatment tank 300 processes the grey water transported by the grey water drainage pipeline of the farmers and the black water treatment tank 500 processes the black water transported by the black water drainage pipeline of the farmers to obtain the grey water, which is stored in the grey water storage unit;

[0057] Step 101: Obtain the growth status of crops planted in the artificial wetland 600;

[0058] Step 102: When the growth state is the metabolic stage, the reclaimed water storage unit drives the reclaimed water to the artificial wetland 600, the reclaimed water use pipeline of the farmer, and the irrigation pipeline of the vegetable greenhouse 900. The artificial wetland 600 processes part of the reclaimed water to obtain first clean water, which is stored in the clean water storage tank 800.

[0059] Step 103. When the growth state is in the non-metabolic period, the grey water collection unit drives the grey water to the greenhouse artificial wetland 1000, the farmers' grey water use pipelines and the irrigation pipelines of the vegetable greenhouse 900. The greenhouse artificial wetland 1000 processes part of the grey water to obtain second clean water, which is stored in the clean water storage tank 800.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A rural domestic sewage treatment system, characterized in that: It includes a grit chamber, a gray water treatment tank, a septic tank, a black water treatment tank, a reclaimed water storage unit and an artificial wetland. The farmer's gray water sewage pipeline is connected to the water inlet pipeline of the grit chamber, the water outlet pipeline of the grit chamber is connected to the water inlet pipeline of the gray water treatment tank, the water outlet pipeline of the gray water treatment tank is connected to the water inlet pipeline of the reclaimed water storage unit, the farmer's black water sewage pipeline is connected to the water inlet pipeline of the septic tank, the water outlet pipeline of the septic tank is connected to the water inlet pipeline of the black water treatment tank, the water outlet pipeline of the black water treatment tank is connected to the water inlet pipeline of the reclaimed water storage unit, the water outlet pipeline of the reclaimed water storage unit is connected to the water inlet pipeline of the artificial wetland, and the farmer's reclaimed water use pipeline is connected to the water outlet pipeline of the reclaimed water storage unit; The black water treatment tank is provided with an empty cavity and a treatment cavity in sequence along the gravity direction. A frozen soil layer and the treatment cavity are arranged in sequence along the gravity direction. The treatment cavity is provided with an attachment layer, and anaerobic microorganisms are attached to the attachment layer. The reclaimed water collection section includes N levels of first water storage wells arranged in sequence, and the first water storage wells include at least one reclaimed water storage tank; wherein, a reclaimed water overflow pipe is provided on the upper part of the reclaimed water storage tank of the i-1th level, and the reclaimed water overflow pipe is connected to the reclaimed water storage tank of the i-1th level; a return pipe is provided at the bottom of the reclaimed water storage tank of the i-1th level, and the return pipe is connected to the reclaimed water storage tank of the i-1th level; a non-return assembly is provided on the return pipe, which only allows fluid to flow from the reclaimed water storage tank of the i-1th level to the reclaimed water storage tank of the i-1th level, wherein N is an integer ≥2, and i is an integer ≥2 and =N, and the reclaimed water storage tank of the first level is provided with a reclaimed water outlet pump, and the outlet end of the reclaimed water outlet pump is connected to the water inlet pipeline of the artificial wetland and the reclaimed water use pipeline of the farmer, and the bottom of the reclaimed water storage tank of the latter level is higher than the bottom of the reclaimed water storage tank of the previous level; The rural domestic sewage treatment system also includes a greenhouse artificial wetland. The outlet pipe of the reclaimed water storage unit is connected to the inlet pipe of the greenhouse artificial wetland, and the outlet pipe of the greenhouse artificial wetland is connected to the inlet pipe of the clean water storage tank.

2. The rural domestic sewage treatment system according to claim 1, characterized in that: The treatment chamber is divided into an anaerobic space and a filtration space. The vacant chamber is communicated with the anaerobic space. The attachment layer is arranged in the anaerobic space. The anaerobic space is communicated with the filtration space. The filtration space is provided with a filter material layer. Aerobic microorganisms are attached to the filter material layer.

3. The rural domestic sewage treatment system according to claim 1, characterized in that: At least one multifunctional auxiliary pipe is provided in the middle of the reclaimed water storage tank, and the multifunctional auxiliary pipe connects the reclaimed water storage tanks of two adjacent stages. A cut-off component is provided on the multifunctional auxiliary pipe.

4. The rural domestic sewage treatment system according to claim 1, characterized in that: The rural domestic sewage treatment system also includes a clean water storage tank and a vegetable greenhouse. The farmer's household's recycled water use pipeline and the vegetable greenhouse's irrigation pipeline are both connected to the outlet pipeline of the recycled water collection part, the artificial wetland's outlet pipeline is connected to the inlet pipeline of the clean water storage tank, the outlet pipeline of the clean water storage tank is connected to the farmer's household's clean water use pipeline, and the outlet pipeline of the clean water storage tank is connected to the irrigation pipeline of the vegetable greenhouse.

5. The rural domestic sewage treatment system according to claim 4, characterized in that: The irrigation pipeline of the vegetable greenhouse and the clean water pipeline of the farmer are both connected to the outlet pipeline of the clean water storage tank.

6. A method for using a rural domestic sewage treatment system, using the rural domestic sewage treatment system according to any one of claims 1 to 5, characterized in that: The method of use includes: The grey water treatment pool processes the grey water transported by the grey water drainage pipeline of the farmer and the black water treatment pool processes the black water transported by the black water drainage pipeline of the farmer to obtain grey water, and the grey water is stored in the grey water storage unit; Obtaining the growth status of crops planted in the artificial wetland; When the growth state is the metabolic stage, the reclaimed water storage unit drives the reclaimed water to the artificial wetland, the reclaimed water use pipeline of the farmer and the irrigation pipeline of the vegetable greenhouse, the artificial wetland processes part of the reclaimed water to obtain first clean water, and the first clean water is stored in the clean water storage tank; When the growth state is in the non-metabolic period, the grey water collection part drives the grey water to the greenhouse artificial wetland, the farmer's grey water use pipeline and the vegetable greenhouse irrigation pipeline, and the grey water in the greenhouse artificial wetland treatment part is used to obtain the second clean water, which is stored in the clean water storage tank.

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