Rural domestic sewage treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a rural domestic sewage treatment system which comprises a pretreatment subsystem and a land infiltration subsystem, the pretreatment subsystem is used for pretreating to-be-treated sewage to remove floating matters, suspended matters and organic matters in the to-be-treated sewage so as to obtain pretreated wastewater; the land infiltration subsystem is used for purifying pollutants in the pretreated wastewater to obtain reclaimed water; the land percolation subsystem comprises a land percolation tank and a filler layer arranged in the land percolation tank; the filler layer comprises a covering layer, a water dispersing layer, an upper anti-blocking layer, a ventilation layer, a lower anti-blocking layer, a refined filtration layer and a drainage layer which are arranged in a layered manner from top to bottom; according to the utility model, the pretreatment subsystem is adopted to pretreat the sewage to be treated, and the land infiltration subsystem is adopted to purify the pretreated wastewater, so that the resource utilization of the sewage is realized, and the system is simple in structure, simple and convenient to operate and manage and low in operation cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a rural domestic sewage treatment system. Background Technique

[0002] Rural domestic sewage mainly refers to domestic wastewater such as rural toilet flushing water, kitchen washing water, and laundry water. It generally contains a large amount of organic matter, inorganic matter, trace elements, and nutrient elements, but basically does not contain heavy metals and refractory organic matter. Currently, simple pretreatment processes, ecological treatment processes, and biological treatment processes are usually adopted for the treatment of rural domestic sewage. However, the existing treatment processes have technical problems such as complex device structures, easy environmental impact, high operation and management difficulty, and high costs, which are specifically as follows:

[0003] (1) Simple pretreatment processes such as septic tanks. Septic tanks are sewage treatment facilities that use the principles of gravity sedimentation and anaerobic fermentation to precipitate and decompose fecal pollutants. They operate anaerobically and do not consume power. However, the treated effluent still contains a large amount of pollutants, which are extremely likely to pollute the environment and cannot be directly discharged into water bodies. It often needs to be treated by grey water treatment before reaching the discharge standard.

[0004] (2) Ecological treatment processes such as constructed wetland treatment processes and stabilization pond treatment processes. Among them, the constructed wetland treatment process is a sewage treatment and purification technology that mimics the natural self-purification effect of wetlands. It is a technology that controllably distributes sewage into a composite system composed of soil, plants, and microorganisms. During the process of sewage flowing in a certain direction in the system, the sewage is purified under the combined action of soil and wet-tolerant plants. The stabilization pond treatment process is a pond that is artificially trimmed and provided with dikes and impermeable layers, and mainly relies on the natural purification principle of aquatic organisms to degrade organic pollutants in sewage. The existing constructed wetland treatment processes and stabilization pond treatment processes generally have low loads, so they cover a large area, have poor operation effects in winter in cold regions, and there is a possibility of plant withering, resulting in high maintenance costs.

[0005] (3) Biological treatment processes such as activated sludge treatment processes and biofilm treatment processes. The activated sludge treatment process is suitable for areas with high requirements for water pollution prevention and control, especially suitable for discharging effluent into sensitive areas. The biofilm treatment process combines a biodegradation reaction with a membrane separation technology using a separation membrane as a filtration medium to complete the biological reaction and solid-liquid separation process in a reactor. However, most of the existing activated sludge treatment processes and biofilm treatment processes use integrated equipment and require chemical phosphorus removal, often with high power consumption, high replacement price of MBR membranes, easy clogging, and the need for cleaning and maintenance, resulting in high operation costs. Content of the Utility Model

[0006] In view of the technical problems existing in the prior art, the utility model provides a rural domestic sewage treatment system to solve the technical problems of complex device structure, easy environmental impact, difficult operation and management, and high cost in the existing treatment process.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a rural domestic sewage treatment system, including a pretreatment subsystem and a land infiltration subsystem;

[0009] The pretreatment subsystem is used for pretreating the sewage to be treated to remove floating matters, suspended matters and organic matters in the sewage to be treated, and obtaining pretreated wastewater; the land infiltration subsystem is used for purifying the pollutants in the pretreated wastewater to obtain reclaimed water;

[0010] The land infiltration subsystem includes a land infiltration tank and a filler layer arranged inside the land infiltration tank; the filler layer includes a covering layer, a water distribution layer, an upper anti-blocking layer, a ventilation layer, a lower anti-blocking layer, a fine filtration layer and a drainage layer which are arranged in layers from top to bottom;

[0011] Wherein, an inlet water distribution pipe is horizontally buried in the water distribution layer, and the inlet water distribution pipe is used for conveying the pretreated wastewater to the water distribution layer; a ventilation air distribution pipe is arranged in the ventilation layer; the ventilation air distribution pipe is horizontally buried in the ventilation layer, and the air inlet of the ventilation air distribution pipe extends to the outside of the covering layer and is communicated with the outside atmosphere.

[0012] Further, the water distribution layer, the ventilation layer and the drainage layer are all gravel layers;

[0013] Wherein, the thicknesses of the water distribution layer, the ventilation layer and the drainage layer are all 150mm, and the gravel particle sizes in the water distribution layer, the ventilation layer and the drainage layer are all 1-3cm.

[0014] Further, the upper anti-blocking layer, the lower anti-blocking layer and the fine filtration layer are all mixed batching layers, and the mixed batching layers are paved with a mixture of river sand and clay; wherein, the thickness of the upper anti-blocking layer is 150mm, the thickness of the lower anti-blocking layer is 150mm, and the thickness of the fine filtration layer is 600mm.

[0015] Further, the inlet water distribution pipe includes a main water distribution pipe and a plurality of water distribution branch pipes;

[0016] The main water distribution pipe is horizontally buried in the water spreading layer and arranged along the long axis center line of the land infiltration pond; the water inlet end of the main water distribution pipe is used to be connected with the outlet of the pretreatment subsystem, and a plurality of the water distribution branch pipes are evenly distributed on both sides of the main water distribution pipe, and a plurality of water distribution through holes are evenly formed in the pipe wall of each water distribution branch pipe; wherein, the water distribution branch pipes located on both sides of the main water distribution pipe are arranged staggeredly along the axial direction of the main water distribution pipe.

[0017] Further, the ventilation air distribution pipe comprises a main ventilation pipe and a plurality of ventilation branch pipes;

[0018] The main ventilation pipe is horizontally buried in the ventilation layer and arranged along the long axis center line of the land infiltration pond; the air inlet end of the main ventilation pipe extends to the outside of the covering layer and is communicated with the outside atmosphere; a plurality of the ventilation branch pipes are evenly distributed on both sides of the main ventilation pipe, and a plurality of air distribution through holes are evenly formed in the pipe wall of each ventilation branch pipe; wherein, the ventilation branch pipes located on both sides of the main ventilation pipe are arranged staggeredly along the axial direction of the main ventilation pipe.

[0019] Further, a diversion ditch is arranged at the bottom of the drainage layer; the diversion ditch is arranged along the long axis center line of the land infiltration pond, and a collecting drain pipe is arranged in the diversion ditch; wherein, the collecting drain pipe is used for collecting the reclaimed water purified by the land infiltration subsystem.

[0020] Further, a reused water tank is further included; the water inlet of the reused water tank is connected with the water outlet of the collecting drain pipe.

[0021] Further, the pretreatment subsystem comprises an artificial grille tank, a hydrolysis acidification tank and an adjustment tank;

[0022] The water inlet of the artificial grille tank is used to be connected with the rural domestic sewage drainage pipe network, and an artificial grille is arranged in the artificial grille tank; the artificial grille tank is connected with the hydrolysis acidification tank through a water passing hole, and a combined filler is arranged in the hydrolysis acidification tank; the hydrolysis acidification tank is connected with the adjustment tank through a water passing hole, and a sewage lift pump is arranged in the adjustment tank; wherein, the water outlet of the sewage lift pump is used to be connected with the water inlet distribution pipe.

[0023] Further, the combined filler adopts a suspended biological filler.

[0024] Further, the covering layer is a soil layer; the thickness of the soil layer is 150 mm.

[0025] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0026] The rural domestic sewage treatment system provided by the utility model pre-treats the sewage to be treated by a pre-treatment subsystem, and purifies the wastewater after pre-treatment by a land infiltration subsystem, realizing the resource utilization of sewage. The system has a simple structure, is easy to operate and manage, and has a low operating cost. Specifically, the pre-treatment subsystem effectively removes floating substances, suspended substances and organic matters in the sewage to be treated, provides good influent conditions for subsequent land infiltration treatment, reduces the treatment burden of the land infiltration subsystem, and improves the overall treatment efficiency.

[0027] Furthermore, the artificial grille tank can intercept and remove floating substances and suspended substances in rural domestic sewage, prevent large particle impurities from entering the land infiltration subsystem, protect the subsequent equipment from damage, and at the same time reduce the burden of subsequent treatment. By setting combined fillers in the hydrolysis acidification tank, the hydrolysis and acidification processes of organic matters in the sewage can be promoted, macromolecular organic matters can be converted into small molecular organic matters, the biodegradability of the sewage can be improved, and better conditions can be created for subsequent land infiltration treatment, thus improving the overall treatment efficiency. By setting an adjustment tank, the water quality and water volume can be balanced, and the influence of influent water quality fluctuations on subsequent treatment units can be reduced. The sewage lift pump is used to supply water to the land infiltration subsystem, effectively ensuring that the sewage can be stably lifted to the land infiltration subsystem, and then ensuring the stable operation of the system and the effluent water quality.

[0028] Furthermore, by setting a filler layer in the land infiltration tank, the filler layer adopts a multi-layer filler layer design of a covering layer, a water distribution layer, an upper anti-blocking layer, a ventilation layer, a lower anti-blocking layer, a fine filtration layer and a drainage layer, so that the wastewater after pre-treatment can undergo multiple purification processes, effectively removing pollutants in the water, improving the effluent water quality, and meeting the standard of reclaimed water reuse. Among them, by arranging an influent water distribution pipe in the water distribution layer, it is ensured that the wastewater after pre-treatment can be evenly distributed throughout the water distribution layer, improving the efficiency of land infiltration. By setting a ventilation air distribution pipe in the ventilation layer, it not only promotes the air circulation in the filler layer, enhances the activity of microorganisms, but also helps to remove the peculiar smell in the wastewater and improves the operation environment of the system. By respectively setting an upper anti-blocking layer and a lower anti-blocking layer above and below the ventilation layer, the ventilation layer is effectively prevented from being blocked, ensuring the ventilation and water body infiltration effects, and further enhancing the purification ability of the land infiltration subsystem. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1Schematic diagram of the overall structure of the rural domestic sewage treatment system provided by the present utility model;

[0031] Figure 2 Plan layout drawing of the influent water distribution pipe in the present utility model;

[0032] Figure 3 Plan layout drawing of the ventilation air distribution pipe in the present utility model;

[0033] Figure 4 Plan layout schematic diagram of the soil infiltration subsystem in the present utility model;

[0034] Figure 5 Longitudinal sectional view of the soil infiltration subsystem in the present utility model.

[0035] Wherein, 1 is an artificial grille tank, 2 is a hydrolysis acidification tank, 3 is an adjustment tank, 4 is a valve well, 5 is a sewage pipeline, 6 is an influent well, 7 is a soil infiltration tank, 8 is a covering layer, 9 is a water spreading layer, 10 is an upper anti-blocking layer, 11 is a ventilation layer, 12 is a lower anti-blocking layer, 13 is a fine filtration layer, 14 is a drainage layer, 15 is a collector drain pipe, 16 is a main water distribution pipe, 17 is a branch water distribution pipe, 18 is a main ventilation pipe, 19 is a branch ventilation pipe, 20 is a reclaimed water tank, 21 is an influent gate, 22 is an artificial grille, 23 is a combined packing, and 24 is a sewage lift pump. Specific implementation manner

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer and more understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0037] As shown in the appended Figures 1-5 figure, the present utility model provides a rural domestic sewage treatment system, including a pretreatment subsystem, a soil infiltration subsystem and a reclaimed water tank 20; the pretreatment subsystem is used to pretreat the sewage to be treated to remove floating matters, suspended matters and organic matters in the sewage to be treated, and obtain pretreated wastewater; the soil infiltration subsystem is used to purify the pollutants in the pretreated wastewater to obtain reclaimed water; the reclaimed water tank 20 is used to store the reclaimed water.

[0038] In the present utility model, the pretreatment subsystem includes a manual grille tank 1, a hydrolysis acidification tank 2, an adjustment tank 3 and a valve well 4; the front end of the manual grille tank 1 is connected to the rural domestic sewage drainage network, and an inlet gate 21 is arranged at the front end of the manual grille tank 1; wherein, the inlet gate 21 is used to block the incoming water during system maintenance; a manual grille 22 is arranged in the manual grille tank 1, which is used to remove floating matters and some garbage and sundries in the sewage to be treated, so as to prevent subsequent facilities from being clogged.

[0039] The manual grille tank 1 is connected to the hydrolysis acidification tank 2 through a water passing hole. The hydrolysis acidification tank 2 is used for preliminarily precipitating the sewage flowing out of the manual grille tank 1 to remove some sand and suspended matters, so as to prevent the subsequent subsurface infiltration subsystem from being blocked. A combined filler 23 is arranged in the hydrolysis acidification tank 2, and the combined filler 23 is used for hydrolyzing and acidifying the sewage in the hydrolysis acidification tank 2 to remove the organic matters in the sewage and obtain the pretreated wastewater, so as to reduce the treatment load of subsequent facilities; preferably, the combined filler 23 adopts a suspended biological filler.

[0040] The hydrolysis acidification tank 2 is connected to the adjustment tank 3 through a water passing hole. The adjustment tank 3 is used for storing the pretreated wastewater and adjusting the water quality and water volume of the pretreated wastewater; a sewage lift pump 24 is arranged in the adjustment tank 3, and the sewage lift pump 24 is used for lifting the sewage in the adjustment tank 3 to the land infiltration subsystem for subsequent purification treatment.

[0041] The valve well 4 is arranged at the rear end of the adjustment tank 3; the water inlet of the valve well 4 is connected to the outlet of the sewage lift pump 24, and the water outlet of the valve well 4 is connected to the land infiltration subsystem through a sewage pipeline 5.

[0042] It should be noted that the manual grille tank 1, the hydrolysis acidification tank 2, the adjustment tank 3 and the valve well 4 all adopt a reinforced concrete tank body structure and are poured in sequence along the water flow direction.

[0043] In the present utility model, the land infiltration subsystem includes an inlet well 6, a land infiltration tank 7 and a filler layer; the inlet well 6 is arranged at the front end of the land infiltration tank 7 and is arranged close to the valve well 4; the inlet well 6 is connected to the valve well 4 through the sewage pipeline 5; wherein, the inlet of the sewage pipeline 5 is connected to the water outlet of the valve well 4, and the outlet of the sewage pipeline 5 is connected to the water inlet of the inlet well 6.

[0044] The land infiltration pond 7 is arranged at the rear end of the water inlet well 6, and the land infiltration pond 7 is a brick-concrete structure pond body; wherein, waterproof mortar is provided on the surfaces of the inner and outer walls of the brick-concrete structure pond body; the filler layer is arranged inside the land infiltration pond 7; the filler layer includes a covering layer 8, a water-dispersing layer 9, an upper anti-blocking layer 10, a ventilation layer 11, a lower anti-blocking layer 12, a fine filtration layer 13 and a drainage layer 14 which are sequentially arranged from top to bottom in layers.

[0045] The covering layer 8 is a soil layer, and the thickness of the covering layer 8 is 150 mm.

[0046] The water-dispersing layer 9 is a gravel layer, and the thickness of the water-dispersing layer 9 is 150 mm; wherein, the gravel particle size in the water-dispersing layer 9 is 1-3 cm; an inlet water distribution pipe is horizontally buried in the water-dispersing layer 9, and the inlet water distribution pipe is used for conveying the pretreated wastewater into the water-dispersing layer 9.

[0047] Specifically, the inlet water distribution pipe includes a main water distribution pipe 16 and a plurality of water distribution branch pipes 17; the main water distribution pipe 16 is horizontally buried in the water-dispersing layer 9 and is arranged along the long-axis center line of the land infiltration pond 7; the water inlet end of the main water distribution pipe 16 extends to the outside of the front end of the land infiltration pond 7 and is connected with the water outlet of the water inlet well 6; a plurality of the water distribution branch pipes 17 are uniformly distributed on both sides of the main water distribution pipe 16, one end of the water distribution branch pipe 17 is communicated with the side wall of the main water distribution pipe 16, the other end of the water distribution branch pipe 17 is a blind end and horizontally extends along the short-axis direction of the land infiltration pond 7; a plurality of water distribution through holes are uniformly formed in the pipe wall of each water distribution branch pipe 17, and the water distribution branch pipes 17 on both sides of the main water distribution pipe 16 are arranged staggeredly along the axis direction of the main water distribution pipe 16 to ensure that the pretreated wastewater can be uniformly conveyed into the water-dispersing layer 9 to achieve the purpose of uniform water distribution; preferably, both the main water distribution pipe 16 and the water distribution branch pipes 17 are made of UPVC pipes.

[0048] Both the upper anti-blocking layer 10, the lower anti-blocking layer 12 and the fine filtration layer 13 are mixed batching layers, and the mixed batching layers are paved with a mixture of river sand and clay; preferably, the thickness of the upper anti-blocking layer 10 is 150 mm, the thickness of the lower anti-blocking layer 12 is 150 mm, and the thickness of the fine filtration layer 13 is 150 mm.

[0049] The ventilation layer 11 is a gravel layer, and the thickness of the ventilation layer 11 is 150 mm; wherein, the gravel particle size in the ventilation layer 11 is 1-3 cm; a ventilation distribution air pipe is horizontally buried in the ventilation layer 11, and the air inlet of the ventilation distribution air pipe extends to the outside of the covering layer 8 and is communicated with the outside atmosphere for conveying outside air into the ventilation layer 11.

[0050] Specifically, the ventilation air distribution duct includes a ventilation main pipe 18 and a plurality of ventilation branch pipes 19; the ventilation main pipe 18 is horizontally buried in the ventilation layer 11 and arranged along the long axis center line of the soil infiltration pool 7; the air inlet end of the ventilation main pipe 18 extends to the outside of the covering layer 8 and is connected to the outside atmosphere; a plurality of ventilation branch pipes 19 are evenly distributed on both sides of the ventilation main pipe 18, one end of the ventilation branch pipe 19 is connected to the side wall of the ventilation main pipe 18, and the other end of the ventilation branch pipe 19 is a blind end and extends horizontally along the short axis direction of the soil infiltration pool 7; a plurality of air distribution holes are evenly opened on the pipe wall of each ventilation branch pipe 19, and the ventilation branch pipes 19 located on both sides of the ventilation main pipe 18 are staggered along the axial direction of the ventilation main pipe 18 to ensure the purpose of uniform air distribution in the ventilation layer 11.

[0051] The drainage layer 14 is a gravel layer, and the thickness of the drainage layer 14 is 150 mm; wherein the gravel particle size in the drainage layer 14 is 1-3 cm; a diversion ditch is arranged at the bottom of the drainage layer 14; wherein the diversion ditch is located between the bottom of the drainage layer 14 and the bottom of the land seepage pool 7, and is arranged along the long axis center line of the land seepage pool 7; a drainage pipe 15 is arranged in the diversion ditch for collecting the reclaimed water purified by the land infiltration subsystem; the outlet of the drainage pipe 15 extends to the rear end outside of the land seepage pool 7, and is used to be connected to the reuse water pool 20.

[0052] The reuse water pool 20 is arranged at the rear end of the land seepage pool 7; the water inlet of the reuse water pool 20 is connected to the water outlet of the drainage pipe 15, and the water outlet of the reuse water pool 20 is connected to the grey water user through a preset grey water pipeline.

[0053] Working principle:

[0054] The rural domestic sewage treatment system described in the utility model, when used, the specific process is as follows:

[0055] Untreated domestic sewage collected through the rural domestic sewage drainage network is used as the sewage to be treated. The sewage to be treated enters the artificial screen pool 1 through the water inlet gate; in the artificial screen pool 1, the floating objects and some garbage and debris in the sewage to be treated are removed by the artificial screen 22; then, it enters the hydrolysis acidification pool 2 through the hydrolysis acidification water distribution pipe for preliminary precipitation, and uses the composite filler 23 for hydrolysis acidification treatment to remove organic matter in the sewage to obtain pretreated wastewater; then, the pretreated wastewater in the hydrolysis acidification pool 2 is lifted to the regulating pool 3 by the sewage lifting pump 24, and the water quality and water quantity are adjusted in the regulating pool 3.

[0056] After that, under the action of the sewage lift pump 24, the pretreated wastewater enters the main water distribution pipe 16 successively through the valve well 4, the sewage pipe 5 and the inlet well 6; after the pretreated wastewater enters the main water distribution pipe 16, water distribution to the water spreading layer 9 starts through the water distribution branch pipes 17 to utilize the land infiltration subsystem for purification.

[0057] Specifically, for the pretreated wastewater entering the water spreading layer 9, a part directly percolates downward under the action of gravity, penetrates the water spreading layer and then continues to move downward, and the other part flows laterally in the water spreading layer 9 and enters the lower anti-blocking layer through the gravel connecting the water spreading layer 9 and the ventilation layer 11; among them, when the sewage flows laterally in the water spreading layer 9, the suspended particulate matters in the sewage are intercepted by fillers with different particle sizes and are continuously decomposed and transformed by the microbial film on the surface of the fillers, realizing the function of sewage purification; when the gravel in the water spreading layer 9 and the ventilation layer 11 are connected, it serves as a secondary water spreading channel and starts to spread water to the lower anti-blocking layer 12, so that the pollutant load in the sewage is highly dispersed, greatly improving the anti-blocking ability of the system; when the sewage enters and moves downward to the fine filtration layer 13, the fillers in the fine filtration layer 13 start to intercept the pollutants in the sewage and carry out microbial decomposition and transformation, and then the sewage is purified into reclaimed water; then, the reclaimed water moves downward to converge in the diversion ditch and enters the reclaimed water tank 20 through the collecting drain pipe 15 for storage and waiting for reuse.

[0058] It should be noted that the land above the rural domestic sewage treatment system can be used as green space, dry land or parking lot, and a PLC subsystem can also be set in the rural domestic sewage treatment system to control the system operation by using the PLC subsystem; preferably, the ratio of the drying period to the dosing period of the rural domestic sewage treatment system is 5:1, and the dosing frequency is 4 times per day; secondly, according to the reuse purpose of the reclaimed water in the reclaimed water tank 20, a pipeline type ultraviolet disinfection device can be added to the system for disinfection treatment.

[0059] In the present utility model, the pretreatment subsystem is used as the first treatment process, effectively removing the floating matters, suspended matters and part of the organic matters in the sewage, and providing relatively clean influent for the subsequent land infiltration subsystem; the land infiltration subsystem utilizes the self-regulating function of the ecosystem composed of soil - microorganism - plant and its comprehensive purification ability for pollutants to purify the pollutants in the sewage; specifically, by using the natural purification ability of the soil and the microorganisms therein, through the synergistic effect of multiple layers of fillers, the pollutants in the wastewater are further removed, especially the dissolved organic matters, nitrogen, phosphorus and other nutrients, and finally reclaimed water that can be used for agricultural irrigation or landscape replenishment is obtained, realizing the recycling of water resources.

[0060] The rural domestic sewage treatment system described in the present utility model mainly relies on the natural purification process. Compared with the traditional sewage treatment process, its operating cost is lower and the maintenance and management are more convenient; a large amount of chemical agents do not need to be added during the whole treatment process, reducing the risk of secondary pollution; at the same time, the reclaimed water generated can be safely reused, which helps to improve the rural ecological environment.

[0061] The above embodiments are only one of the implementation manners capable of realizing the technical solution of the present utility model. The scope of protection required by the present utility model is not only limited by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by any person skilled in the art within the technical scope disclosed by the present utility model.

Claims

1. A rural domestic sewage treatment system, characterized in that: It includes pretreatment subsystem and land infiltration subsystem; The pretreatment subsystem is used to pretreat the wastewater to be treated, so as to remove floating matter, suspended matter and organic matter in the wastewater to be treated, and obtain pretreated wastewater; The land infiltration subsystem is used to purify pollutants in the pretreated wastewater to obtain reclaimed water; The land infiltration subsystem comprises a land infiltration pool (7) and a filler layer arranged inside the land infiltration pool (7); the filler layer comprises a covering layer (8), a water dispersion layer (9), an upper anti-blocking layer (10), a ventilation layer (11), a lower anti-blocking layer (12), a fine filtration layer (13) and a drainage layer (14) arranged in layers from top to bottom; Wherein, a water inlet distribution pipe is horizontally buried in the water dispersion layer (9), and the water inlet distribution pipe is used to transport the pretreated wastewater to the water dispersion layer (9); a ventilation air distribution pipe is arranged in the ventilation layer (11); the ventilation air distribution pipe is horizontally buried in the ventilation layer (11), and the air inlet of the ventilation air distribution pipe extends to the outside of the covering layer (8) and is connected to the outside atmosphere.

2. A rural domestic sewage treatment system according to claim 1, characterized in that: The water dispersion layer (9), the ventilation layer (11) and the drainage layer (14) are all gravel layers; The thickness of the water dispersion layer (9), the ventilation layer (11) and the drainage layer (14) are all 150 mm, and the gravel particle size in the water dispersion layer (9), the ventilation layer (11) and the drainage layer (14) is 1-3 cm.

3. A rural domestic sewage treatment system according to claim 1, characterized in that: The upper anti-blocking layer (10), the lower anti-blocking layer (12) and the fine filtration layer (13) are all mixed material layers, and the mixed material layers are paved with a mixed material of river sand and clay; wherein the thickness of the upper anti-blocking layer (10) is 150 mm, the thickness of the lower anti-blocking layer (12) is 150 mm, and the thickness of the fine filtration layer (13) is 600 mm.

4. A rural domestic sewage treatment system according to claim 1, characterized in that: The water inlet distribution pipe comprises a water distribution main pipe (16) and a plurality of water distribution branch pipes (17); The water distribution main pipe (16) is horizontally buried in the water dispersion layer (9) and arranged along the long axis center line of the land infiltration tank (7); the water inlet end of the water distribution main pipe (16) is used to be connected to the outlet of the pretreatment subsystem, and a plurality of water distribution branch pipes (17) are evenly distributed on both sides of the water distribution main pipe (16), and a plurality of water distribution through holes are evenly opened on the pipe wall of each water distribution branch pipe (17); wherein the water distribution branch pipes (17) located on both sides of the water distribution main pipe (16) are staggeredly arranged along the axial direction of the water distribution main pipe (16).

5. A rural domestic sewage treatment system according to claim 1, characterized in that: The ventilation air distribution duct comprises a ventilation main pipe (18) and a plurality of ventilation branch pipes (19); The main ventilation pipe (18) is horizontally buried in the ventilation layer (11) and arranged along the long axis center line of the soil infiltration pool (7); the air inlet end of the main ventilation pipe (18) extends to the outside of the covering layer (8) and is connected to the outside atmosphere; a plurality of branch ventilation pipes (19) are evenly distributed on both sides of the main ventilation pipe (18), and a plurality of air distribution holes are evenly opened on the pipe wall of each branch ventilation pipe (19); wherein the branch ventilation pipes (19) located on both sides of the main ventilation pipe (18) are staggeredly arranged along the axial direction of the main ventilation pipe (18).

6. A rural domestic sewage treatment system according to claim 1, characterized in that: A diversion ditch is provided at the bottom of the drainage layer (14); the diversion ditch is provided along the long axis centerline of the land infiltration tank (7), and a drainage pipe (15) is arranged in the diversion ditch; wherein the drainage pipe (15) is used to collect the reclaimed water purified by the land infiltration subsystem.

7. A rural domestic sewage treatment system according to claim 6, characterized in that: It also comprises a reuse water pool (20); the water inlet of the reuse water pool (20) is connected to the water outlet of the collection and drainage pipe (15).

8. A rural domestic sewage treatment system according to claim 1, characterized in that: The pretreatment subsystem comprises an artificial grid tank (1), a hydrolysis acidification tank (2) and a regulating tank (3); The water inlet of the artificial grille pool (1) is used to be connected to a rural domestic sewage drainage network, and an artificial grille (22) is arranged in the artificial grille pool (1); the artificial grille pool (1) is connected to the hydrolysis acidification pool (2) through a water hole, and a composite filler (23) is arranged in the hydrolysis acidification pool (2); the hydrolysis acidification pool (2) is connected to the regulating pool (3) through a water hole, and a sewage lifting pump (24) is arranged in the regulating pool (3); wherein the water outlet of the sewage lifting pump (24) is used to be connected to the water inlet distribution pipe.

9. A rural domestic sewage treatment system according to claim 8, characterized in that: The combined filler (23) is a suspended biological filler.

10. A rural domestic sewage treatment system according to claim 1, characterized in that: The covering layer (8) is a soil layer; the thickness of the soil layer is 150 mm.

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