Artificial wetland system for rural sewage treatment and sewage treatment method

Abstract

The present invention provides an artificial wetland system and a sewage treatment method for rural sewage treatment, which belong to the field of water treatment technology. The system includes at least one artificial wetland component and N-level water storage wells arranged in sequence, and the water storage wells include at least one reclaimed water storage unit. The first-level reclaimed water storage unit is provided with a reclaimed water outlet pump, and the outlet end of the reclaimed water outlet pump is connected to the water inlet end of the artificial wetland component. When the average temperature is low and the plant metabolism is inactive, the reclaimed water is temporarily stored, and when the temperature rises and the plant metabolism is vigorous, the reclaimed water is centrally treated, which effectively solves the problem that artificial wetlands in northern China cannot operate normally due to the influence of temperature and plant growth cycle, ensures the treatment effect of reclaimed water, and ensures that rural wastewater meets the treatment standards. Each reclaimed water storage unit has a small footprint, which reduces the difficulty and cost of infrastructure construction. The reclaimed water can effectively maintain a flowing state during the entire storage period to prevent secondary pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to an artificial wetland system for rural sewage treatment and a sewage treatment method. Background Art

[0002] The guiding ideology of rural sewage treatment is source reduction, resource utilization, pollution reduction and carbon reduction, and ecological restoration. However, rural residents' living areas are relatively scattered, and the average daily water consumption per household is relatively small, making it difficult to collect and treat rural sewage in a centralized manner.

[0003] The continuous construction of "new countryside" makes the living areas of rural residents relatively concentrated, which provides the possibility for the centralized treatment of rural sewage. Various rural domestic sewage treatment methods and equipment are applied, among which artificial wetlands are a low-cost and widely used rural sewage treatment method. For example, the Chinese invention patent with patent number CN201110193783.6 discloses an artificial wetland rural sewage treatment method and system, in which domestic sewage is treated into wastewater through multi-grid septic tanks; wastewater enters the grid well and the water collection well to form blended water; blended water enters the biological filter tank and removes organic matter in the water through high-efficiency microbial agents and biological filter materials, and then is purified and absorbed by wetland plants to form living water; living water enters the composite artificial wetland to further remove residual nitrogen and phosphorus compounds to form reclaimed water; reclaimed water then enters the oxidation pond, and uses the material transformation of multiple food chains in the oxidation pond to degrade and purify organic matter and nutrients in the water, and finally becomes qualified water for recycling or discharge.

[0004] However, in northern China, there are fewer species of aquatic wetland plants, and their metabolic peak period is only from April to November each year. They are in a state of slow metabolism or no metabolism for at least nearly 5 months, making it difficult to achieve the purpose of further removing nitrogen and phosphorus compounds in the water. To solve the above technical problems, for example, a Chinese utility model patent with patent number CN201220521103.9 discloses an insulated rural domestic sewage artificial wetland treatment system, in which the artificial wetland part is composed of a horizontal subsurface flow wetland and a vertical flow wetland in series, wherein the contact oxidation tank, the sedimentation tank and the artificial wetland part are arranged in a greenhouse or an insulated greenhouse. The above artificial wetland treatment system insulates the artificial wetland through a greenhouse or an insulated greenhouse, and the construction and operation costs are high, and the artificial wetland has a small footprint. Entering again, the Chinese invention patent with patent number CN201810472097.4 provides a biological-ecological combined treatment system for rural sewage under low temperature conditions, including a grid, a regulating tank, an anaerobic bioreactor, a fixed low-temperature enhanced reactor, a sedimentation tank and an alternating submerged flow artificial wetland that are connected in sequence to treat sewage step by step, and also includes a biogas recovery and utilization device connected to the anaerobic bioreactor, and a sludge treatment device connected to the sedimentation tank; wherein the fixed low-temperature enhanced reactor is used for aeration treatment of sewage, and is inoculated with a low-temperature bacterial agent; the alternating submerged flow artificial wetland includes at least two layers of independently operated wetlands, and an impermeable interlayer is set between the adjacent two layers of wetlands. In the above technical solution, the upper and lower layers of independently operated wetland systems are set up, and the infrastructure difficulty and infrastructure cost increase. The use of low-temperature bacterial agents also greatly increases the difficulty and cost of operation and management, and it cannot fundamentally solve the problem of rural sewage treatment in winter in northern China.

[0005] It is hoped that the reclaimed water can be stored in winter and spring for treatment in summer and autumn. However, for larger natural villages, the daily sewage output may reach 50t-120t. According to the five-month storage time, assuming that the depth of the water storage equipment is 5m, at least 1500㎡-3600㎡ (2.25 mu-5.4 mu) of land is required, which has the following problems:

[0006] 1. Water storage equipment occupies a large area and requires independent planning of construction land, with high infrastructure costs and difficulty in management;

[0007] 2. In water storage equipment that occupies a large area, water remains in a slow-flowing or stagnant state for a long time, which can easily form "stagnant water" and cause secondary pollution. Summary of the invention

[0008] Based on this, the present invention provides an artificial wetland system and a sewage treatment method for rural sewage treatment to solve the technical problems existing in the prior art of using artificial wetland methods to treat domestic sewage in high-altitude and cold areas, which have high construction and operation costs and are prone to secondary pollution.

[0009] The technical solution of the present invention to solve the above technical problems is as follows:

[0010] An artificial wetland system for rural sewage treatment, comprising at least one artificial wetland component and N levels of water storage wells arranged in sequence, wherein the artificial wetland component covers the water storage well, and the water storage well comprises at least one reclaimed water storage part; wherein a reclaimed water overflow pipe is arranged on the upper part of the reclaimed water storage part of the i-1th level, and the reclaimed water overflow pipe is connected to the reclaimed water storage part of the i-th level; a return pipe is arranged on the bottom of the reclaimed water storage part of the i-th level, and the return pipe is connected to the reclaimed water storage part of the i-1th level; and a non-return component is arranged on the return pipe, which only allows fluid to flow from the reclaimed water storage part of the i-th level to the reclaimed water storage part of the i-1th level, wherein N is an integer ≥2, and i is an integer ≥2 and ≤N;

[0011] The first-stage reclaimed water storage part is provided with a reclaimed water outlet pump, and the outlet end of the reclaimed water outlet pump is connected to the water inlet end of the artificial wetland component.

[0012] Preferably, N=2, or N=3, or N=4.

[0013] Preferably, the number of water storage wells at the i-th level is at least one.

[0014] Preferably, at least one multifunctional auxiliary pipe is provided in the middle of the grey water storage part, the multifunctional auxiliary pipe connects the grey water storage parts of two adjacent stages, and a cut-off assembly is provided on the multifunctional auxiliary pipe.

[0015] Preferably, the water storage well further comprises a clean water storage portion, and the clean water storage portion is connected to a water outlet end of the artificial wetland assembly.

[0016] Preferably, the clean water storage section is connected to at least one of the clean water storage sections adjacent thereto.

[0017] Preferably, an outlet end of at least one of the clean water storage parts is connected to a water fertilizer system.

[0018] Preferably, a support portion is provided at the inlet of the water storage well, and the artificial wetland assembly is located on the support portion.

[0019] Preferably, the artificial wetland assembly comprises a plurality of artificial wetland troughs, and the plurality of artificial wetland troughs are sequentially arranged on the support portion.

[0020] A rural sewage treatment method, based on the above-mentioned artificial wetland system for rural sewage treatment, is characterized by comprising the following steps:

[0021] Obtaining the growth status of crops planted in the artificial wetland component;

[0022] When the growth state is in the metabolic stage, the reclaimed water obtained by treating rural sewage and the reclaimed water stored in the reclaimed water storage part are discharged to the artificial wetland component;

[0023] When the growth state is a non-metabolism period, the reclaimed water obtained by treating the rural sewage is discharged into the reclaimed water storage part for temporary storage.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] An artificial wetland component and a water storage well including a reclaimed water storage unit are set up. In northern China, in summer or autumn when the average temperature is high and the plants are in a period of vigorous metabolism, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the artificial wetland component, and the ammonia nitrogen and phosphorus content in the reclaimed water is reduced through physical, biological and chemical effects, and then discharged or recycled for reuse. In winter and spring when the average temperature is low and the plants are in a period of slow metabolism or no metabolism, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the reclaimed water storage unit for storage. After the temperature rises and the plant metabolism is restored, the reclaimed water stored in the reclaimed water storage unit is sent to the artificial wetland component, and discharged or recycled for reuse after treatment. By setting up the grey water storage unit, when the average temperature is low and the plant metabolism is inactive, the grey water is temporarily stored, and when the temperature rises and the plant metabolism is vigorous, the grey water is centrally treated, which effectively solves the problem of artificial wetlands not being able to operate normally in northern China due to the influence of temperature and plant growth cycle, ensures the treatment effect of grey water, and ensures that rural wastewater is treated up to standard.

[0026] At the same time, by setting up the grey water storage parts in a graded manner, each of the grey water storage parts or each of the water storage wells has a smaller footprint, reducing the difficulty and cost of infrastructure construction. At the same time, the location of the water storage well can be based on the local terrain, topography and distribution of building land, without the need for special construction land. More importantly, during the storage process, the grey water is gradually diverted from the grey water storage part of the previous level to the grey water storage part of the next level, and during the use of the grey water, it flows back from the next level to the previous level. Therefore, during the entire storage period of the grey water, the grey water can effectively maintain a flowing state, preventing the grey water from not flowing for a long time to form "dead water" and causing secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1Schematic diagram of equipment distribution of an artificial wetland system for rural sewage treatment in one embodiment.

[0028] Figure 2 Schematic diagram of the equipment flow of an artificial wetland system for rural sewage treatment in one embodiment.

[0029] Figure 3 for Figure 2 A partial enlarged view of section A is shown.

[0030] Figure 4 Schematic diagram of the structure of a cut-off component in one embodiment.

[0031] Figure 5 Schematic diagram (cross section) of the structure of an artificial wetland assembly in one embodiment.

[0032] Figure 6 Schematic diagram of the structure of an artificial wetland assembly in one embodiment (top view).

[0033] In the figure: an artificial wetland system 10 for rural sewage treatment, an artificial wetland component 100, an artificial wetland trough 101, a trough body 1011, a filler layer 1012, a water storage well 200, a support part 201, a grey water storage part 210, a main storage part 210-1, an auxiliary storage part 210-2, a tertiary storage part 210-3, a grey water outlet pump 211, a grey water overflow pipe 212, a return pipe 213, a check assembly 214, a receiving part 2141, a check gate 2142, an auxiliary float 2143, a multifunctional auxiliary pipe 215, a cut-off assembly 216, a cut-off part 2161, a clean water storage part 220, and a water fertilizer system 300. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be further described below in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0035] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Please see Figure 1 and Figure 2 In a specific embodiment of the present invention, an artificial wetland system 10 for rural sewage treatment is suitable for treating rural sewage using an artificial wetland method in areas with obvious seasonal temperature changes such as northern China.

[0037] The artificial wetland system 10 for rural sewage treatment includes at least one artificial wetland component 100 and N levels of water storage wells 200 arranged in sequence. The artificial wetland component 100 covers the water storage well 200, and the water storage well includes at least one reclaimed water storage part 210. A reclaimed water overflow pipe 212 is arranged on the upper part of the reclaimed water storage part 210 of the i-1st level, and the reclaimed water overflow pipe 212 is connected to the reclaimed water storage part 210 of the i-1st level. A return pipe 213 is arranged at the bottom of the reclaimed water storage part 210 of the i-1st level, and the return pipe 213 is connected to the reclaimed water storage part 210 of the i-1st level. A non-return component 214 is arranged on the return pipe 213, which only allows fluid to flow from the reclaimed water storage part 210 of the i-1st level to the reclaimed water storage part 210 of the i-1st level, wherein N is an integer ≥2, and i is an integer ≥2 and ≤N. The first-stage reclaimed water storage unit 210 is provided with a reclaimed water outlet pump 211 , and the outlet end of the reclaimed water outlet pump 211 is connected to the water inlet end of the artificial wetland assembly 100 .

[0038] In some areas, such as northern China, when the average temperature is high in summer or autumn and the plants are in a period of vigorous metabolism, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the artificial wetland component 100, and the ammonia nitrogen and phosphorus content in the reclaimed water is reduced through physical, biological and chemical effects, and then discharged or recycled for reuse. In winter and spring, when the average temperature is low and the plants are in a period of slow metabolism or no metabolism, the reclaimed water containing ammonia nitrogen and phosphorus obtained after centralized treatment of rural sewage is sent to the reclaimed water storage unit 210 for storage. After the temperature rises and the plant metabolism is restored, the reclaimed water stored in the reclaimed water storage unit 210 is sent to the artificial wetland component 100, and discharged or recycled for reuse after treatment. By setting up the grey water storage unit 210, when the average temperature is low and the plant metabolism is inactive, the grey water is temporarily stored, and when the temperature rises and the plant metabolism is vigorous, the grey water is centrally treated, which effectively solves the problem of artificial wetlands not being able to operate normally in northern China due to the influence of temperature and plant growth cycle, ensures the treatment effect of grey water, and ensures that rural wastewater is treated up to standard.

[0039] For example, the grey water storage unit 210 is divided into a main storage unit 210-1, at least one auxiliary storage unit 210-2 and at least one tertiary storage unit 210-3. The upper parts of the multiple auxiliary storage units 210-2 are connected to the main storage unit 210-1 through the grey water overflow pipe 212, and the multiple tertiary storage units 210-3 are connected to at least one auxiliary storage unit 210-2 through the grey water overflow pipe 212. After the rural sewage is treated, the grey water is discharged into the main storage unit 210-1 nearby. After the storage unit 210-1 is filled, the grey water is diverted to the auxiliary storage unit 210-2 through the grey water overflow pipe 212. After the auxiliary storage unit 210-2 is filled with water, the grey water is diverted to the tertiary storage unit 210-3 through the grey water overflow pipe 212.

[0040] It is understood by those skilled in the art that, depending on the specific situation, only the main storage unit 210-1 and the auxiliary storage unit 210-2 may be constructed without constructing the third-level storage unit 210-3. It is also possible to construct a fourth-level storage unit, a fifth-level storage unit, etc. on the basis of the third-level storage unit 210-3. A plurality of the second-level intermediate water storage units 210 and the intermediate water storage units 210 of the subsequent levels may be provided to form a intermediate water storage network.

[0041] In the above-mentioned implementation mode, the grey water is diverted from the nearest main storage unit 210-1 to the auxiliary storage unit 210-2 and the tertiary storage unit 210-3 in sequence. On the one hand, only one set of water inlet pumps is required or water is directly inletted by gravity, and the pump does not need too large a head, which reduces the number of pumps and the operation time, and reduces the construction cost and operation cost. On the other hand, during the entire grey water storage process, the grey water in each of the grey water storage units 210 is in a flowing or disturbed state, which strengthens the fluidity of the grey water and avoids the long-term storage of the grey water in a static state, forming dead water and causing secondary pollution.

[0042] During the storage of the grey water, since the grey water level in the main storage unit 210-1 is always higher than the grey water level in the auxiliary storage unit 210-2, the grey water will not flow back to the main storage unit 210-1 through the reflux pipe under the action of static pressure. During the drainage process, water can be pumped only from the main storage unit 210-1. When the grey water level in the main storage unit 210-1 drops to a level lower than the grey water level in the auxiliary storage unit 210-2, the grey water in the auxiliary storage unit 210-2 flows back to the main storage unit 210-1 through the reflux pipe 213 under the action of static pressure. By analogy, when the level of the grey water storage unit 210 of the previous stage drops to a level lower than the level of the grey water storage unit 210 of the next stage, the grey water in the grey water storage unit 210 of the next stage flows back to the grey water storage unit 210 of the previous stage until the water in the grey water storage unit 210 of the next stage is drained. Preferably, the bottom of the latter-stage grey water storage section 210 is higher than the bottom of the former-stage grey water storage section 210, so that the grey water in the latter-stage grey water storage section 210 can be completely drained.

[0043] In the above embodiment, by setting the return pipe 213 and the check assembly 214 at the bottom of the grey water storage section 210, it is possible to discharge water from one or a few of the grey water storage sections 210, thereby reducing the investment in machine pump equipment and facilitating the unified treatment of grey water.

[0044] In a preferred embodiment, at least one multifunctional auxiliary pipe 215 is provided in the middle of the grey water storage section 210 , and the multifunctional auxiliary pipe 215 is connected to at least one grey water storage section 210 close to the water storage well 200 , and a cut-off assembly 216 is provided on the multifunctional auxiliary pipe 215 .

[0045] That is to say, the upper and lower parts of the intermediate water storage unit 210 and the lower intermediate water storage unit 210 are not only connected at the top and bottom, but also at least one multifunctional auxiliary pipe 215 is provided in the middle part for connecting the upper and lower intermediate water storage units 210 and the lower intermediate water storage units 210. Under normal circumstances, the cut-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 water storage units 210 at each level and prevent the water in the lower water storage unit 210 from not flowing for a long time and forming dead water, causing secondary pollution, the cut-off component 216 is opened in time, so that the adjacent two levels of water storage tanks are connected, and the water in the upper water storage well flows into the lower water storage well, and fresh water is added to the lower water storage well. Or in another embodiment of the present invention, when the water pressure is not enough to open the check component 214, in order to introduce the water of the lower water storage unit 210 into the upper water storage unit 210 in advance, the cut-off component 216 can be opened to divert water. In another case, when water needs to be taken from the next-level water storage unit 210 for use nearby, the cut-off component 216 can be opened so that the water in the previous-level water storage unit 210 is introduced into the next-level water storage unit 210 in advance for use nearby.

[0046] In some embodiments, the check assembly 214 is a one-way valve. Figure 3 In one preferred embodiment, in order to facilitate infrastructure construction and reduce infrastructure costs, the non-return assembly 214 includes a receiving member 2141 and a non-return gate 2142 provided at the water outlet end of the return pipe 213, the upper end of the non-return gate 2142 is hingedly connected to the receiving member 2141 or the well wall of the water storage well, and the non-return gate 2142 can cover the receiving member 2141. In the water-inflow state, the non-return gate 2142 is tightly attached to the receiving member 2141 under its own gravity and water pressure to prevent water from entering the next-level water storage part 210. In the water outlet state, when the liquid level of the upper-level grey water storage part 210 drops to be lower than the liquid level of the lower-level grey water storage part 210, and the back pressure exerted by the water in the lower-level grey water storage part 210 on the non-return gate 2142 is greater than the sum of the pressure exerted by the water in the upper-level grey water storage part 210 and the gravity of the non-return gate 2142, the non-return gate 2142 separates from the receiving part 2141, and the water in the lower-level grey water storage part 210 flows back to the upper-level grey water storage part 210.

[0047] Preferably, in order to prevent the check gate 2142 from being unable to be opened smoothly, an auxiliary float 2143 is further provided on the check gate 2142, and the auxiliary float 2143 applies a force to the check gate 2142 away from the receiving member 2141. Under the action of water buoyancy, the check gate 2142 is always subjected to a force away from the receiving member 2141, so when the liquid level of the upper-level intermediate water storage part 210 drops to be lower than the liquid level of the lower-level intermediate water storage part 210, the back pressure does not need to overcome the gravity of all the check gates 2142, and can be opened, thereby effectively ensuring the smoothness of the water flow.

[0048] Please also see Figure 4 In a specific embodiment, the cut-off assembly 216 includes a cut-off gate plate disposed at the end of the multifunctional auxiliary pipe 215, and the cut-off gate plate can be raised and lowered along the well depth direction. A cut-off portion 2161 is disposed on the cut-off gate plate, and the cut-off portion 2161 can cover the end of the multifunctional auxiliary pipe 215. Under normal circumstances, the cut-off portion 2161 covers the end of the multifunctional auxiliary pipe 215. When the multifunctional auxiliary pipe 215 needs to be opened, the cut-off gate plate is pulled upward to separate the cut-off portion 2161 from the end of the multifunctional auxiliary pipe 215, so that the upper-level intermediate water storage portion 210 is connected to the lower-level intermediate water storage portion 210.

[0049] In some preferred embodiments, the water storage well 200 further includes a clean water storage unit 220, which is connected to the water outlet of the artificial wetland assembly 100. In some cases, such as in the summer in northern China, the treated rural sewage produces reclaimed water that is sent to the artificial wetland assembly 100 for further treatment. After treatment, relatively clean water is obtained, which is collected in the clean water storage unit 220 for recycling.

[0050] Furthermore, the clean water storage unit 220 is connected to at least one of the clean water storage units 220 adjacent thereto. That is, among the multiple clean water storage units 220, at least two of the clean water storage units 220 are connected, which facilitates the diversion of clean water to places with large water demand. Preferably, the connection method of the clean water storage unit 220 can be selected in a similar manner as the grey water storage unit 210 to save space and reduce costs.

[0051] The artificial wetland assembly 100 and the water storage well 200 can be independently arranged. In order to save construction land, the artificial wetland assembly 100 is at least partially arranged on the water storage well 200. Figure 5 and Figure 6For example, the artificial wetland assembly 100 is located on the water storage well 200. Specifically, a support portion 201 is provided at the wellhead of the water storage well 200. The support portion 201 can be formed by brick, stone or concrete masonry, or can be formed by overlapping angle steel, wood or the like at the wellhead of the water storage well 200. The artificial wetland assembly 100 is located on the support portion 201.

[0052] In some preferred embodiments, in order to facilitate construction, the artificial wetland assembly 100 includes a plurality of artificial wetland troughs 101, and the plurality of artificial wetland troughs 101 are arranged on the support portion. Specifically, the artificial wetland trough 101 includes a trough body 1011 and a filler layer 1012 arranged inside the trough body 1011 for planting plants and filtering reclaimed water. A drainage port is arranged on the trough body 1011, and the drainage ports of the plurality of trough bodies are connected to each other. In the above embodiment, the trough body 1011 should not be too large, and the total weight of the trough body 1011 and the filler layer 1012 should not be too large, so as to facilitate construction and installation.

[0053] In some preferred embodiments, the wetland units are provided in plurality. On the one hand, the provision of the plurality of wetland units makes each of the wetland units miniaturized, thereby facilitating construction and reducing construction costs. On the other hand, the wetland units with smaller areas do not need to be constructed on specially planned large areas of construction land, and the construction sites can be freely selected according to the local topography, land function and water use conditions, further reducing the difficulty of construction and construction costs. More importantly, the total volume of the plurality of water storage wells 200 can be reasonably set according to the total amount of locally generated reclaimed water, ensuring that the water storage wells 200 can accommodate the total amount of locally generated reclaimed water during the entire period when the reclaimed water is not processed. This avoids the embarrassment of requiring a large-capacity water storage device for reclaimed water storage.

[0054] For example, a rural sewage treatment station in a certain place produces 50 tons of reclaimed water per day. Assuming that the reclaimed water needs to be disposed of for 5 months a year, it is necessary to set up a water storage device with a capacity of at least 7,500 tons. If the device is a water storage tank, it will take about 1,500 square meters (2.25 acres) of land at a depth of 5 meters, and its construction and management costs are relatively high. However, if the water storage well 200 is also built at a depth of 5 meters, the area of ​​each water storage well 200 does not exceed 200 square meters. Only a few water storage wells 200 need to be built to meet the storage demand for reclaimed water, which not only does not occupy a large area of ​​land, but also facilitates the management of each water storage well 200.

[0055] In some preferred embodiments, at least one outlet of the clean water storage unit 210 is connected to a water fertilizer system 300. The recycled clean water is used to prepare water fertilizer and to irrigate non-direct edible plants or landscaping or direct edible plants, thereby improving the sewage recycling rate in rural areas.

[0056] In a preferred embodiment, the artificial wetland system 10 for rural sewage treatment is constructed in farmland, and the wetland units are distributed in different positions of the farmland. Not only can the artificial wetland component 100 be used to form a farmland landscape ecology, which is conducive to the development of rural tourism, but also the recycled clean water can be fully utilized as irrigation water for farmland, thereby improving the reuse rate of rural grey water.

[0057] In another preferred embodiment, the artificial wetland system 10 for rural sewage treatment is constructed in a landscape garden, and the wetland units are distributed in different locations of the garden to form a small park. This can not only give full play to the landscape effect of the artificial wetland, but also make full use of the recycled clean water as irrigation water for the garden, thereby improving the reuse rate of rural water.

[0058] In another embodiment of the present invention, a rural sewage treatment method is provided, based on the above-mentioned artificial wetland system 10 for rural sewage treatment, comprising the following steps:

[0059] Obtaining the growth status of crops planted in the artificial wetland component;

[0060] When the growth state is in the metabolic period, the reclaimed water obtained by treating the rural sewage and the reclaimed water stored in the reclaimed water storage part 210 are discharged to the artificial wetland assembly 100 .

[0061] When the growth state is in the non-metabolism period, the treated rural sewage is discharged into the reclaimed water storage part 210 for temporary storage.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for treating rural sewage, It is characterized in that Based on an artificial wetland system for rural sewage treatment, the artificial wetland system for rural sewage treatment includes at least one artificial wetland component and N levels of water storage wells arranged in sequence, the artificial wetland component covers the water storage well, and the water storage well includes at least one gray water storage part; wherein, a gray water overflow pipe is arranged on the upper part of the gray water storage part of the i-1th level, and the gray water overflow pipe is connected to the gray water storage part of the i-th level; a return pipe is arranged at the bottom of the gray water storage part of the i-th level, and the return pipe is connected to the gray water storage part of the i-1th level; and a fluid is arranged on the return pipe so as to allow only fluid to flow into the gray water storage part. A non-return component for the water flowing from the i-th level of the reclaimed water storage part to the i-1-th level of the reclaimed water storage part, and the bottom of the i-th level of the reclaimed water storage part is higher than the bottom of the i-1-th level of the reclaimed water storage part, wherein N is an integer ≥2, and i is an integer ≥2 and ≤N; the first level of the reclaimed water storage part is provided with a reclaimed water outlet pump, and the outlet end of the reclaimed water outlet pump is connected to the water inlet end of the artificial wetland component; at least one multifunctional auxiliary pipe is provided in the middle of the reclaimed water storage part, and the multifunctional auxiliary pipe connects the reclaimed water storage parts of two adjacent levels, and a cut-off component is provided on the multifunctional auxiliary pipe; The rural sewage treatment method comprises: Obtaining the growth status of crops planted in the artificial wetland component; When the growth state is in the metabolic stage, the reclaimed water obtained by treating rural sewage and the reclaimed water stored in the reclaimed water storage part are discharged to the artificial wetland component; When the growth state is a non-metabolism period, the reclaimed water obtained by treating the rural sewage is discharged into the reclaimed water storage part for temporary storage.

2. The rural sewage treatment method according to claim 1, It is characterized in that N=2, or N=3, or N=4.

3. The rural sewage treatment method according to claim 1, It is characterized in that The water storage well of the i-th level is set to be at least one.

4. The rural sewage treatment method according to claim 1, It is characterized in that The water storage well also includes a clean water storage portion, and the clean water storage portion is connected to the water outlet end of the artificial wetland component.

5. The rural sewage treatment method according to claim 4, It is characterized in that The clean water storage part is in communication with at least one clean water storage part adjacent thereto.

6. The rural sewage treatment method according to any one of claims 4 or 5, It is characterized in that The outlet end of at least one of the clean water storage parts is connected to a water fertilizer system.

7. The rural sewage treatment method according to claim 1, It is characterized in that A support portion is arranged at the inlet of the water storage well, and the artificial wetland assembly is located on the support portion.

8. The rural sewage treatment method according to claim 7, It is characterized in that The artificial wetland assembly comprises a plurality of artificial wetland troughs, and the plurality of artificial wetland troughs are sequentially arranged on the support portion.

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