CN114230103B - Rural distributed domestic sewage treatment device based on multistage soil infiltration system - Google Patents
Rural distributed domestic sewage treatment device based on multistage soil infiltration system Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/14—NH3-N
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- C02F2209/16—Total nitrogen (tkN-N)
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- C02F2209/18—PO4-P
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- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a rural distributed domestic sewage treatment device based on a multistage soil infiltration system, which comprises a water storage tank and a multistage soil infiltration tank, wherein the water storage tank and the multistage soil infiltration tank are connected through a water inlet pipe; the multi-stage soil infiltration tank is internally provided with a water distribution layer, a first permeable layer, a filtering unit, a perforated plate and a second permeable layer from top to bottom in sequence, the filtering unit comprises a plurality of soil module layers and a filtering material layer which are alternately arranged, and a water outlet pipe is arranged on the side wall of the multi-stage soil infiltration tank at the second permeable layer; the soil module layer includes a plurality of U type clods of evenly placing and opening ascending from a left side to the right side at interval, and it is filled with filler I to fill between the adjacent U type clod and U type clod opening. The device has good nitrogen and phosphorus removal performance, and has the advantages of low construction cost, low operation and maintenance cost, small occupied area and the like.
Description
Technical Field
The invention belongs to the field of sewage treatment, relates to rural distributed domestic sewage treatment facilities, and particularly relates to a rural distributed domestic sewage treatment device based on a multistage soil infiltration system.
Background
At present, most of the remote rural areas in China have laggard sewage treatment facilities, and the sewage treatment is not optimistic. The existing sewage treatment process with high energy consumption and complex technology is not suitable for rural distributed domestic sewage which has the characteristics of small sewage generation amount, high fluctuation, dispersed generation source, poor water quality, difficult sewage collection and the like, and the popularization and the application of the sewage treatment technology are directly restricted. Therefore, a sewage treatment process which is suitable for rural distributed domestic sewage, is economical and applicable, and has stable and reliable operation, low energy consumption, good treatment effect and simple operation needs to be found.
The traditional multistage soil infiltration system mostly adopts materials with different permeability coefficients (adsorption capacity) to carry out layered filling to form a layered aerobic/anaerobic zone for nitrogen and phosphorus removal, but because of poor air permeability and the appearance of a water-wrapping zone, the problems of oxygen deficiency and blockage are mostly overcome by adopting power technologies such as aeration, back washing and the like. At present, many researches have been made to further improve the treatment efficiency of the system by changing the operating conditions of the system, such as changing the aeration amount, the aeration mode (intermittent aeration), the internal filling material, the hydraulic load, and the like. The multistage soil infiltration system can fully utilize locally available resources (such as zeolite, wheat straws, scrap iron and the like) and add the resources into soil, so that the cost can be reduced, and the phosphorus removal effect, the denitrification effect and the specific pollutant removal effect of the system can be improved. The removal rate of COD, TN and TP can be improved by appropriate amount of aeration, but the excess aeration causes the concentration of nitrate nitrogen in effluent to be too high, and the removal rate of TN is reduced. Meanwhile, scrap iron in the soil is directly oxidized into ferric iron oxide hydrate and is precipitated in the soil, so that the removal rate of total phosphorus is reduced.
Under the conditions of domestic water resource shortage and increasingly serious river and lake pollution, the multi-stage soil infiltration system technology is used as a low-cost sewage treatment ecological engineering technology, can effectively relieve the blockage problem of a land treatment system and improve the service life, has the theoretical significance and practical value of deep research, and has important practical significance for developing the multi-stage soil infiltration system technology suitable for rural distributed domestic sewage treatment.
Disclosure of Invention
The invention aims to solve the problems and provides a rural distributed domestic sewage treatment device based on a multistage soil infiltration system, which has the advantages of good nitrogen and phosphorus removal performance, low construction cost, low operation and maintenance cost, small occupied area and the like.
In order to achieve the aim, the invention provides a rural distributed domestic sewage treatment device based on a multistage soil infiltration system, which comprises a water storage tank and a multistage soil infiltration tank which are connected through a water inlet pipe;
the multi-stage soil infiltration tank is characterized by comprising a water distribution layer, a first permeable layer, a filtering unit, a perforated plate and a second permeable layer which are sequentially arranged in the multi-stage soil infiltration tank from top to bottom, wherein the filtering unit comprises a plurality of soil module layers and a filtering material layer which are alternately arranged, and a water outlet pipe is arranged on the side wall of the multi-stage soil infiltration tank at the second permeable layer; the soil module layer comprises a plurality of U-shaped soil blocks which are uniformly arranged from left to right at intervals and have upward openings, and fillers I are filled between every two adjacent U-shaped soil blocks and in the openings of the U-shaped soil blocks; nitrifying bacteria and denitrifying bacteria are attached and grown inside each soil module layer, and nitrifying bacteria are attached and grown inside each filter material layer. Sewage flows out through the water outlet pipe after flowing through the water distribution layer, the first permeable layer, the filtering unit, the perforated plate and the second permeable layer from the water storage tank in sequence.
According to the rural distributed domestic sewage treatment device based on the multistage soil infiltration system, the U-shaped clods are made of purple soil, biochar and sponge iron; the purple soil has excellent N and P adsorption performance, the biochar is prepared by pyrolyzing rice straws and rape straws as raw materials, has excellent carbon release performance and adsorption performance, provides a carbon source for denitrification, adsorbs N, P, antibiotics and other pollutants, provides more inhabitation spaces for microorganisms due to a complex surface structure, optimizes a microbial community structure, can further enhance the nitrogen and phosphorus removal effect of a system device, and has excellent phosphorus removal performance due to sponge iron. The adsorption capacity and percolation rate of the biochar brick (namely the U-shaped clod filled with the filler I) are different under different biochar adding proportions, and the purple soil, the biochar and the sponge iron are preferably 50-70% in percentage by mass: 20% -30%: 10% -20%, and under the proportion, the biochar brick has excellent adsorption capacity and good percolation rate. The grain diameters of the purple soil, the biochar and the sponge iron are respectively 2mm, 2mm and 0.85mm. The filler I comprises natural zeolite with the particle size of 2-4 mm. Nitrifying bacteria and denitrifying bacteria are attached and grown in each soil module layer, and specifically, the filler I mainly provides an aerobic environment and mainly adheres to the nitrifying bacteria; the U-shaped soil block mainly provides an aerobic environment and an anaerobic environment, and nitrifying bacteria and denitrifying bacteria are mainly attached.
Above-mentioned rural distributed domestic sewage treatment plant based on multistage soil filtration system, among the filter unit, the soil module layer of odd number layer is one-level soil module layer, and the soil module layer of even number layer is second grade soil module layer. The number of the U-shaped soil blocks in the first-level soil module layer is preferably 2N, the number of the U-shaped soil blocks in the second-level soil module layer is preferably 2N-1, N is larger than or equal to 1, and the placement position of the U-shaped soil blocks in the second-level soil module layer is below the position between the adjacent U-shaped soil blocks in the first-level soil module layer. The soil blocks are staggered and U-shaped mainly for increasing the hydraulic retention time. Preferably, N =2 or 3, and further preferably N =2, that is, the number of the U-shaped soil blocks in the primary soil module layer is four, and the number of the U-shaped soil blocks in the secondary soil module layer is three.
Above-mentioned rural distributed domestic sewage treatment plant based on multistage soil filtration system, the quantity of soil module layer and precoat does not have special restriction, on satisfying the basis that sets up in proper order in turn, its specific quantity can according to actual need setting. The soil module layer is preferably one more layer than the filter material layer, namely the top layer and the bottom layer are both soil module layers. Further, the number of the soil module layers is preferably five, and the soil module layers specifically include a first soil module layer, a second soil module layer, a third soil module layer, a fourth soil module layer and a fifth soil module layer, wherein the first soil module layer, the third soil module layer and the fifth soil module layer are first-level soil module layers, and the second soil module layer and the fourth soil module layer are second-level soil module layers.
Above-mentioned rural distributed domestic sewage treatment plant based on multistage soil filtration system, for reaching better sewage treatment effect, all sewage homoenergetic are through all kinds of processing unit's processing, and are preferred the width of U type clod is not less than the spacing distance between the adjacent U type clod.
According to the rural distributed domestic sewage treatment device based on the multistage soil infiltration system, the water distribution layer has the function of uniformly distributing water, no special requirement is required for the filler of the water distribution layer, the conventional filler in the field can be selected on the basis of uniformly distributing water, and the water distribution layer is preferably uniformly filled with white gravels with the particle sizes of 2-4 mm respectively. The permeable layer is used for supporting and preventing the hydraulic condition of the system from deteriorating, on the basis of achieving the effect, conventional fillers in the field can be selected, and preferably, the first permeable layer and the second permeable layer are uniformly mixed and filled with white gravels with the grain diameters of 2-4 mm, 1.5-2 cm, 2-3 cm and 3-5 cm respectively.
The aforesaid is based on rural distributed domestic sewage treatment plant of multistage soil filtration system, water distribution layer top is located soil infiltration pond top and still is equipped with the water-locator, through advancing water piping connection between storage water tank and the water-locator. Under the action of the water distributor, sewage can uniformly enter the multistage soil infiltration pond. A peristaltic pump and a time control switch are arranged on the water inlet pipe between the water storage tank and the water distributor.
Above-mentioned rural distributed domestic sewage treatment plant based on multistage soil filtration system, the play water end of outlet pipe adopts bi-pass water pipe to divide into two, and a level goes out water, and another branch goes out water with bottommost soil module layer bottom parallel and level.
The rural distributed domestic sewage treatment device based on the multistage soil infiltration system has the following beneficial effects:
(1) The construction cost is extremely low. The device has simple structure, the main base materials are derived from agricultural wastes and original soil, the raw materials can be used locally, the transformation cost is saved to a limited extent, and the device can resist severe environments such as rainstorm, drought and the like.
(2) Low operation and maintenance cost. The device of the invention can use a lifting pump, has no power equipment, can also combine the mountain height difference to form a natural gravity flow condition, changes the hydraulic retention time through the permeation rate difference of the base material, and hardly needs manual maintenance.
(3) The floor area is reduced. The device enhances the availability ratio of the filler by scientific arrangement of the U-shaped soil blocks, thereby reducing the occupied area.
(4) The nitrogen and phosphorus removal performance is enhanced. The filler combination optimized by the device has good adsorption effect on nitrogen and phosphorus, the higher porosity of the percolation layer can effectively prevent the blockage problem in soil percolation, reduce dead zones, form an aerobic environment at the same time, and is beneficial to organic matter degradation and aerobic nitration reaction. The mixed soil block has small porosity, thereby forming an anaerobic environment and promoting the denitrification to be carried out, thus forming a plurality of aerobic and anaerobic environments in the whole system device, promoting the removal of pollutants and improving the performance of nitrogen and phosphorus removal. The addition of the biochar material can adsorb nitrogen and phosphorus and provide a carbon source for denitrification, and more inhabitation spaces are provided for microorganisms due to the complex surface structure of the biochar, so that the microbial community structure is optimized, and the nitrogen and phosphorus removal effect of the system device is further enhanced. The use of sponge iron can improve the phosphorus removal effect of the system device.
(5) Emerging pollutants can be removed. The biochar in the device has rich porous structures to adsorb new pollutants, such as antibiotics and the like, and can improve the ecological environment of water body environment in rural areas and the pollution conditions of antibiotics and resistance genes.
Drawings
FIG. 1 is a schematic structural diagram of a rural distributed domestic sewage treatment device based on a multistage soil infiltration system;
fig. 2 is a schematic diagram of a perforated plate structure.
Description of reference numerals: 1. a water storage tank; 2. a water inlet pipe; 3. a peristaltic pump; 4. a multi-stage soil infiltration tank; 5. a water outlet pipe; 6. a time control switch; 7. a water distributor; 8. distributing a water layer; 9. a first water permeable layer; 10. a first soil module layer; 11. a first filter material layer; 12. a second soil module layer; 13. a second filter material layer; 14. a third soil module layer; 15. a third filter material layer; 16. a fourth soil module layer; 17. a fourth filter material layer; 18. a fifth soil module layer; 19. a perforated plate; 20. a second water permeable layer.
Detailed Description
So that the technical solutions of the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, belong to the present invention.
The rural distributed domestic sewage treatment device based on multistage soil filtration system that this embodiment provided, as shown in fig. 1, include storage water tank 1 and multistage soil infiltration pond 4 through advancing water piping 2 and connecting, from last cloth water layer 8 to setting gradually down in the multistage soil infiltration pond 4, first permeable layer 9, the filter unit, perforated plate 19 and second permeable layer 20, the filter unit includes from last first soil module layer 10 to setting up once down, first filter material layer 11, second soil module layer 12, second filter material layer 13, third soil module layer 14, third filter material layer 15, fourth soil module layer 16, fourth filter material layer 17, fifth soil module layer 18. The first soil module layer 10, the third soil module layer 14 and the fifth soil module layer 18 are first-level soil module layers, and the second soil module layer 12 and the fourth soil module layer 16 are second-level soil module layers.
The top of the soil infiltration tank is also provided with a water distributor 7 above the water distribution layer 8, and the water storage tank 1 is connected with the water distributor 7 through a water inlet pipe 2. A peristaltic pump 3 and a time control switch 6 are arranged on the water inlet pipe 2 between the water storage tank 1 and the water distributor 7. The peristaltic pump 3 is used for lifting the sewage in the water storage tank 1 to the water distributor 7, the water inflow is controlled by adjusting the rotating speed of the peristaltic pump 3, and the time control switch 6 is used for controlling the water distribution time.
The height of the water distribution layer 8 is 10cm, and the water distribution layer 8 is uniformly filled with white gravels with the particle size of 2-4 mm to play a role in uniformly distributing water. The height of the first permeable layer 9 is 5cm, white gravels with the grain diameters of 2-4 mm, 1.5-2 cm, 2-3 cm and 3-5 cm are uniformly mixed and filled, and the functions of supporting and preventing the hydraulic condition of the system from deteriorating are achieved.
The heights of all the soil module layers (the first soil module layer 10, the second soil module layer 12, the third soil module layer 14, the fourth soil module layer 16 and the fifth soil module layer 18) are all 8cm, and nitrobacteria and denitrifying bacteria are attached and grown inside the soil module layers. Specifically, each soil module layer all includes a plurality of from a left side to the even interval in right side place and the ascending U type soil block of opening, all fills between the adjacent U type soil block and in the U type soil block opening and has packed filler I. Four U-shaped soil blocks are placed in the first soil module layer 10, the third soil module layer 14 and the fifth soil module layer 18 of the first soil module layer, and three U-shaped soil blocks are placed in the second soil module layer 13 and the fourth soil module layer 16 of the second soil module layer. The placement position of the U-shaped soil blocks in the second-level soil module layer is below the adjacent U-shaped soil blocks in the first-level soil module layer. The width of the U-shaped soil blocks is larger than the spacing distance between the adjacent U-shaped soil blocks. The filler I comprises natural zeolite with the particle size of 2-4 mm. The U-shaped soil block is prepared from uniformly mixed purple soil, biochar and sponge iron with the particle sizes of 2mm, 2mm and 0.85mm respectively, and the mass percentages of the purple soil, the biochar and the sponge iron are 50% -70%: 20% -30%: 10 to 20 percent. The purple soil has excellent N and P adsorption performance, the biochar is prepared by pyrolyzing rice straws and rape straws by adopting raw materials, has excellent carbon release performance and adsorption performance, provides a carbon source for denitrification, adsorbs N, P, antibiotics and other pollutants, provides more inhabitation spaces for microorganisms by a complex surface structure, optimizes a microbial community structure, can further enhance the nitrogen and phosphorus removal effect of a system device, and has excellent phosphorus removal performance. Nitrifying bacteria are attached to the filler I, and nitrifying bacteria and denitrifying bacteria are attached to the U-shaped soil block.
The height of each filter material layer (the first filter material layer 11, the second filter material layer 13, the third filter material layer 15 and the fourth filter material layer 17) is 50mm, nitrobacteria are attached and grown in the filter material layers, and the filter material layers are uniformly filled with natural zeolite with the particle size of 2-4 mm. Natural zeolite to NH 3 the-N has excellent adsorption performance and can also prevent the hydraulic condition of the system from being deteriorated. The perforated plate 19 is a plate structure with a plurality of small holes, and the small holes are uniformly distributed, as shown in fig. 2. The perforated plate mainly plays a supporting role, and is convenient for the construction of the soil module layer.
The height of the second permeable layer 20 is 10cm, white gravels with the grain sizes of 2-4 mm, 1.5-2 cm, 2-3 cm and 3-5 cm are uniformly mixed and filled, and the functions of supporting and preventing the hydraulic condition of the system from deteriorating are achieved.
A water outlet pipe 5 is arranged on the side wall of the multistage soil infiltration tank 4 at the position of the second permeable layer 20. The water outlet end of the water outlet pipe 5 is divided into two branches by a double-way water pipe, one branch horizontally discharges water, and the other branch is flush with the bottom of the bottommost soil module layer to discharge water.
The method for treating sewage by using the rural distributed domestic sewage treatment device based on the multistage soil infiltration system provided by the embodiment comprises the following steps: rural domestic sewage to be treated in the water storage tank 1 enters a water distributor 7 through a water inlet pipe 2 under the action of a peristaltic pump 3, and under the action of the water distributor 7, the sewage uniformly enters a multistage soil infiltration tank 4, sequentially flows through a water distribution layer 8, a first permeable layer 9, a first soil module layer 10, a first filter material layer 11, a second soil module layer 12, a second filter material layer 13, a third soil module layer 14, a third filter material layer 15, a fourth soil module layer 16, a fourth filter material layer 17, a fifth soil module layer 18, a perforated plate 19 and a second permeable layer 20, and is finally discharged through a water outlet pipe, wherein the hydraulic load of inlet water is 0.3-0.5 m 3 /m 2 D, regulating the ratio of the flooding time to the drying time of the device to be 1 by the time control switch 6.
The sewage is treated by adopting the process steps, and the water quality index of the inlet water is as follows: COD Cr ＝60～360mg/L，TN＝20～50mg/L,NH 3 -N＝10～50mg/L,TP＝1～8mg/L；COD Cr ，TN，NH 3 The removal rates of-N and TP respectively reach 85.27-99.41%, 93.15-99.61%, 95.02-99.63% and 98.20-99.95%, and the effluent quality index reaches the first-class A discharge standard in the pollutant discharge standard (GB 18918-2002) of the urban sewage treatment plant.
After sewage enters the multistage soil infiltration tank, pollutants such as COD, N, P and the like in the sewage are intercepted and adsorbed by the filler in the tank, and then are further degraded under the action of microorganisms in the tank. The degradation of the microorganisms to pollutants is mainly divided into aerobic decomposition and anaerobic decomposition, wherein COD in the sewage is removed mainly by aerobic heterotrophic microorganisms in a soil module layer and a filter material layer, organic matters intercepted and adsorbed in the system are used as a nutrient source to convert energy required by physiological activities through aerobic metabolism or synthesize cytoplasm of the organic matters, and the organic matters are used as a carbon source to supplement nitrification and denitrification. The existence form of N in rural domestic sewage is mainly organic nitrogen and NH 3 N, organic nitrogen is partly removed directly by surface adsorption of soil and zeolite in the soil module layer and the filter material layer, and partly aminated toThe ammonia nitrogen and the ammonia nitrogen in the sewage are removed together through nitrification, denitrification or zeolite adsorption. The removal of P in the sewage comprises the oxidation of iron in the soil module layer to form Fe 2+ And then further oxidized to produce Fe 3+ ，Fe 3+ And PO 4 3- The reaction generates precipitate to remove P, in addition, the soil and the biochar in the soil module layer have adsorption effect on P, the adsorption capacity of the soil on P is positively correlated with the composition of active iron of the soil, and the adsorption of the soil on P can be promoted after Fe in the soil module layer is oxidized.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto and changes may be made without departing from the scope of the invention in its aspects.
Claims (7)
1. The utility model provides a rural distributed domestic sewage treatment plant based on multistage soil filtration system which characterized in that: comprises a water storage tank (1) and a multistage soil infiltration tank (4) which are connected through a water inlet pipe (2);
the multi-stage soil infiltration tank is characterized by comprising a water distribution layer (8), a first permeable layer (9), a filtering unit, a perforated plate (19) and a second permeable layer (20) which are sequentially arranged in the multi-stage soil infiltration tank (4) from top to bottom, wherein the filtering unit comprises a plurality of soil module layers and filter material layers which are alternately arranged, and a water outlet pipe (5) is arranged on the second permeable layer (20) on the side wall of the multi-stage soil infiltration tank (4); the soil module layer comprises a plurality of U-shaped soil blocks which are uniformly arranged from left to right at intervals and have upward openings, and fillers I are filled between every two adjacent U-shaped soil blocks and in the openings of the U-shaped soil blocks; nitrifying bacteria and denitrifying bacteria are attached and grown inside each soil module layer, and nitrifying bacteria are attached and grown inside each filter material layer;
the U-shaped soil block is prepared from 50-70% by mass: 20% -30%: 10-20% of purple soil, biochar and sponge iron; the grain sizes of the purple soil, the biochar and the sponge iron are respectively 2mm, 2mm and 0.85mm;
the filler I comprises natural zeolite with the particle size of 2-4 mm;
in the filtering unit, the soil module layer of single several layers is one-level soil module layer, the soil module layer of two several layers is second grade soil module layer, the quantity of U type soil piece in one-level soil module layer is 2N, the quantity of U type soil piece in second grade soil module layer is 2N-1, N is greater than or equal to 1, the position of placing of U type soil piece in second grade soil module layer is the below between the adjacent U type soil pieces in one-level soil module layer.
2. The rural decentralized domestic sewage treatment plant based on multistage soil filtration system of claim 1, characterized in that: the number of the soil module layers is five, and N =2 or 3.
3. The rural distributed domestic sewage treatment device based on multistage soil infiltration system of claim 1, characterized in that: the width of the U-shaped soil blocks is not less than the spacing distance between the adjacent U-shaped soil blocks.
4. The rural decentralized domestic sewage treatment plant based on multistage soil filtration system of claim 1, characterized in that: the water distribution layer (8) is uniformly filled with white gravels with the particle sizes of 2-4 mm respectively.
5. The rural decentralized domestic sewage treatment plant based on multistage soil filtration system of claim 1, characterized in that: the first permeable layer (9) and the second permeable layer (20) are uniformly mixed and filled with white gravels with the grain diameters of 2-4 mm, 1.5-2 cm, 2-3 cm and 3-5 cm respectively.
6. The decentralized rural domestic sewage treatment plant according to any of claims 1 to 5 based on a multistage soil infiltration system, wherein: a water distributor (7) is arranged above the water distribution layer (8), and the water storage tank (1) is connected with the water distributor (7) through a water inlet pipe (2); a peristaltic pump (3) and a time control switch (6) are arranged on the water inlet pipe (2) between the water storage tank (1) and the water distributor (7).
7. The rural decentralized domestic sewage treatment plant based on multistage soil filtration system according to any one of claims 1 to 5, wherein: the water outlet end of the water outlet pipe (5) is divided into two branches by a double-through water pipe, one branch horizontally discharges water, and the other branch horizontally discharges water at the same level with the bottom of the bottommost soil module layer.
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