CN203284291U - Land infiltration system adopting minimally invasive excavation for treating rural domestic sewage - Google Patents

Abstract

A minimally invasive excavation land infiltration rural domestic sewage treatment system includes a septic tank, a water volume adjustment tank, a first water lifting device and a percolation wetland. The infiltration wetland includes a columnar water-retaining wall, soil as a percolation layer arranged in the columnar water-retaining wall, a water distribution pipe, a collection pipe, a clean water collection shaft with a bottom, and a water supply pipe. The clean water collection shaft is set in the soil inside the columnar partition wall. The water inlet of the water distribution pipe is connected with one end of the water inlet pipe, and the other end of the water inlet pipe is connected with the first outlet of the water volume adjustment tank. The height of the water inlet of the water distribution pipe is Corresponding to the height of the first outlet of the water volume adjustment tank, the collection pipe is set in the soil in the columnar water barrier, and one end of the collection pipe is connected with the clean water collection shaft, the other end of the collection pipe is closed, and the pipe of the collection pipe Water seepage holes are opened on the wall; the water inlet of the first water lifting device is arranged in the clean water collection shaft.

Description

Minimally Invasive Excavation Land Infiltration Rural Domestic Sewage Treatment System

technical field

The utility model relates to the technical field of rural sewage treatment, in particular to a minimally invasive excavation land infiltration and rural domestic sewage treatment system.

Background technique

With the rapid development of my country's economy, environmental pollution has become increasingly serious. The pollution of sewage to the environment has been widely concerned by people. However, under the strong supervision of the state, industrial sewage and urban domestic sewage have relatively complete sewage treatment systems.

However, there are still many problems in rural areas with relatively weak economic conditions. Rural domestic sewage has the characteristics of multiple points, wide areas, relatively scattered, good biochemical properties, and low treatment costs. The rural sewage treatment in Ningxia has just begun. Now Some rural domestic sewage treatment facilities, such as septic tanks, artificial wetlands, land infiltration, etc., have problems such as low removal rate and secondary pollution caused by drainage; if they are constructed according to the sewage treatment system standards for industrial sewage and urban domestic sewage, It will increase the construction cost and operation cost.

Contents of the invention

In view of this, it is necessary to provide a minimally invasive excavation land infiltration rural domestic sewage treatment system with low construction cost and high purification rate.

A minimally invasive excavation land infiltration rural domestic sewage treatment system includes a septic tank, a water volume adjustment tank, a first water lifting device and a percolation wetland. The outlet of the septic tank is connected to the water inlet of the water volume adjustment tank, and the first outlet of the water volume adjustment tank is connected to the infiltration wetland through the guide pipe. The soil of the percolation layer, the water distribution pipe, the collection pipe, the clean water collection shaft with the bottom and the water supply pipe. The clean water collection shaft is set in the soil in the columnar partition wall, the water inlet of the water distribution pipe is connected with one end of the water inlet pipe, and the other end of the water inlet pipe is connected with the first outlet of the water volume adjustment tank, the height of the water inlet of the water distribution pipe is Corresponding to the height of the first outlet of the water volume regulating tank, the water outlet of the water distribution pipe diverts the water transported by the water volume regulating tank to the soil in the columnar water barrier, and the collecting pipe is arranged in the soil in the columnar water barrier, and One end of the collection pipe communicates with the clean water collection shaft, the other end of the collection pipe is closed, and a water seepage hole is opened on the pipe wall of the collection pipe, so that the water filtered by the soil enters the collection pipe through the water seepage hole of the collection pipe, and is collected by the collection pipe. The pipe drains into the clean water collection shaft; the water inlet of the first water lifting device is arranged in the clean water collection shaft, so as to pump out the clean water collected in the clean water collection shaft for reuse.

Preferably, the minimally invasive excavation land infiltration rural domestic sewage treatment system also includes a second water lifting device, a tower-type biological filter, and the water volume adjustment tank also has a second drain, and the second drain is located below the first drain , and close to the bottom of the water volume regulating pool; the water inlet of the second water lifting device communicates with the second drain, and the water outlet of the second water lifting device is set above the tower biofilter to lift the water from the water volume regulating pool The water is sprayed into the tower-type biological filter according to a predetermined amount. The tower-type biological filter includes a tower body and a plastic packing arranged in the tower body. The water inlets of the water distribution pipes are connected, and valves for controlling the outflow of water are installed on the first drain port and the second drain port of the water volume regulating pool.

Preferably, the hydraulic load of the infiltration wetland is 0.1-0.2m3/(㎡.d), the soil in the columnar water-retaining wall is covered with a 30cm insulation layer, and plants are planted on the insulation layer.

Preferably, the water distribution pipe is arranged in the thermal insulation layer at a depth of 20 cm, and there are 2 to 5 water distribution holes per meter on the side of the water distribution pipe close to the clean water collection shaft.

Preferably, one end of the collection pipe connected to the clean water collection shaft is lower than the other end of the collection pipe, and the collection pipes are distributed in a fan shape with the center of the infiltration wetland as a circle; except for the lower 1/4 area of the collection pipe surface, other areas All cloth has seepage holes.

Preferably, the collection pipe is arranged at 3 meters in the soil in the columnar water-retaining wall, the collection pipe forms an included angle of 0-5° with the horizontal plane, and the clean water collection shaft is 5 meters deep.

Preferably, the septic tank includes a tank body and a dividing plate and an overflow weir arranged in the tank body. The dividing plate and the overflow weir divide the tank body into an acidification zone, an anaerobic zone, and a sedimentation zone. The clear liquid in the acidification zone is formed by The water outlet in the middle of the partition enters the anaerobic zone, and the sewage treated by anaerobic digestion flows from the overflow weir to the sedimentation zone, and then flows into the water volume adjustment tank from the outlet of the septic tank.

Preferably, the residence time of the sewage treated by anaerobic digestion in the water volume regulating tank is 10 hours.

The above-mentioned minimally invasive excavation land infiltration rural domestic sewage treatment system, the water volume adjustment tank stably transports the sewage treated by the septic tank to the water distribution pipe through the water supply pipe, and then the water distribution pipe transports it to the soil in the columnar water barrier, and the collection pipe Buried in the soil in the columnar water barrier for filtration, the filtered water enters the collection pipe through the seepage hole of the collection pipe, and is drained by the collection pipe to the clean water collection shaft, and the first water lifting device collects the clean water The clean water collected in the shaft is pumped out for reuse, so as to improve the purification rate of sewage through the combination of septic tanks and artificial wetlands. In addition, because the system adopts minimally invasive excavation technology, only by setting columnar partitions around the soil as a filter layer The water wall does not need to excavate the soil as the filter layer, which greatly reduces the construction cost of the infiltration sewage treatment system.

Description of drawings

Fig. 1 is a structural schematic diagram of a minimally invasive excavation land infiltration rural domestic sewage treatment system in a preferred embodiment.

Fig. 2 is a schematic structural diagram of the infiltration wetland in Fig. 1 with the insulation layer removed.

Fig. 3 is a schematic structural diagram of the septic tank in Fig. 1 .

In the figure: minimally invasive excavation land infiltration sewage treatment system 10, septic tank 20, outlet 21, pool body 22, partition 23, overflow weir 24, water volume adjustment tank 30, water inlet 31, first outlet 32. Second drainage port 33, valve 34, first water lifting device 40, infiltration wetland 50, columnar water barrier 51, soil 52, water distribution pipe 53, water inlet 531, water outlet 532, collection pipe 54, seepage hole 541. Clean water collection shaft 55, incoming water pipe 56, insulation layer 57, guide pipe 60, second water lifting device 70, water inlet 71, tower type biofilter 80, tower body 81, plastic filler 82.

Detailed ways

In order to solve the problems of high construction and operating costs of domestic sewage treatment facilities in rural areas, poor treatment effect of single septic tank for domestic sewage, and secondary pollution caused by discharge, the domestic sewage treatment system provided by the invention adopts minimally invasive excavation land infiltration treatment technology, a shaft is drilled at the center of the soil at the construction site, the original soil is used as a filter layer, and the collection pipe is pierced into the soil layer from the shaft by a pipe piercer. This method can achieve the purpose of saving the construction cost of the infiltration system, and the sewage is filtered It is filtered by the first layer, and then collected into the central shaft by the collection pipe, and stored for irrigation and landscape water, so as to achieve the purpose of purification and recycling of domestic sewage.

Please refer to FIG. 1 and FIG. 2 , the minimally invasive excavation land infiltration sewage treatment system 10 includes a septic tank 20 , a water volume adjustment tank 30 , a first water lifting device 40 and a infiltration wetland 50 .

The outlet 21 of the septic tank 20 communicates with the water inlet 31 of the water adjustment tank 30 , and the outlet 32 of the water adjustment tank 30 communicates with the percolation wetland 50 through the guide pipe 60 . The percolation wetland 50 includes a columnar water-retaining wall 51 , a soil 52 as a percolation layer arranged in the columnar water-retaining wall 51 , a water distribution pipe 53 , a collecting pipe 54 , a clean water collection shaft 55 with a bottom, and a water supply pipe 56 . The clean water collection shaft 55 is arranged in the soil 52 in the columnar water-dividing wall 51, the water inlet of the water distribution pipe 53 communicates with one end of the water supply pipe 56, and the other end of the water supply pipe 56 communicates with the outlet 32 of the water volume regulating tank 30, and the distribution The height of the water inlet of water pipe corresponds to the height of the first discharge port 32 of the water volume regulating tank, the height of the water inlet 31 of the water volume regulating tank 30 is greater than the height of the first discharge port 32, and the water outlet of the water distribution pipe 53 connects the water volume regulating tank The water transported by 30 is diverted to the soil 52 in the columnar water partition wall 51, and the collection pipe 54 is arranged in the soil 52 in the columnar water partition wall 51, and one end of the collection pipe 54 communicates with the clean water collection shaft 55, and the collection pipe 54 The other end is closed, and a water seepage hole 541 is opened on the pipe wall of the collection pipe 54, so that the water filtered by the soil 52 enters the collection pipe 54 through the water seepage hole 541 of the collection pipe 54, and is drained by the collection pipe 54 to the clean water collection shaft 55; the water inlet 41 of the first water lifting device 40 is set in the clean water collection shaft 55, so as to extract the clean water collected in the clean water collection shaft 55 for reuse. Among them, the columnar water-retaining wall 51 can be built with clay with a height of 3.1m and a geomembrane or a concrete wall to isolate the percolation wetland 50 from the surrounding environment waterproofly. The columnar water-retaining wall 51 is 3m deep underground and 0.1m above the ground; The bottom and wall of the collection shaft 55 are anti-seepage treated. The first water lifting device 40 can regularly pump out the water for reuse. The designed pumping interval is greater than 24 hours. switch to prevent excessive water storage in the infiltration wetland 50, which will cause adverse effects on the system.

Further, the minimally invasive excavation land infiltration sewage treatment system 10 also includes a second water lifting device 70, a tower type biofilter 80, and the water volume adjustment tank 30 also has a second drain 322, and the height of the first drain 33 is the same as that of the first drain 33. The height of the water inlet of the water distribution pipe 53 is corresponding, and the second discharge port 33 is located below the first discharge port 32, and is close to the bottom of the water volume regulating pool 30; the water inlet 71 of the second water lifting device 70 is connected to the second discharge port 33, the water outlet 72 of the second water lifting device 70 is set above the tower-type biological filter 80, so as to spray the water lifted from the water volume adjustment tank 30 into the tower-type biological filter 80 according to a predetermined amount, and the tower-type biological The filter tank 80 includes a tower body 81 and a plastic filler 82 arranged in the tower body 81. The bottom of the tower body 81 is provided with a drain outlet 811. The drain outlet 811 of the tower body 81 is connected to the water inlet 531 of the water distribution pipe 53 of the infiltration wetland 50 Connected, wherein, the first water outlet 32 and the second water outlet 33 of the water volume regulating pool 30 are equipped with a valve 34 for controlling the outflow of water. Wherein, the first water lifting device 40 and the second water lifting device 70 can be assembled by using a water pump and a water delivery pipe.

Please refer to Fig. 3 at the same time, the septic tank 20 includes a tank body 22 and a partition 23 and an overflow weir 24 arranged in the tank body 22. The partition 23 and the overflow weir 24 divide the tank body 22 into an acidification zone, an anaerobic area, sedimentation area, and the clear liquid in the acidification area enters the anaerobic area from the outlet 221 in the middle of the partition plate 23, and the sewage treated by anaerobic digestion flows to the sedimentation area from the overflow weir 24, and then flows through the outlet of the septic tank 20 21 flows into the water volume regulating tank 30 .

In this embodiment, the hydraulic load of the infiltration wetland 50 is 0.1-0.2m3/(㎡.d), and the soil 52 in the columnar water-retaining wall 51 is covered with a 30cm thermal insulation layer 57, and plants are planted on the thermal insulation layer 57, and the The water pipe 53 is arranged in the insulation layer 57, and the setting depth is 20cm. The side of the water distribution pipe 53 near the clean water collection shaft 55 has 2 to 5 water distribution holes per meter. Lower than the other end of the collection pipe 54, the collection pipe 54 is distributed in a fan shape with the center of the infiltration wetland 50 as a circle; the pipe surface of the collection pipe 54 is provided with water seepage holes 541 except for the lower 1/4 area, which is beneficial to The collection pipe 54 collects the clear water treated by soil 52 infiltration, and the collection pipe 54 is arranged at 3 meters in the soil 52 in the columnar water barrier 51. The collection pipe 54 is at an angle of 0 to 5° with the horizontal plane. 55 deep 5 meters.

When using the minimally invasive excavation land infiltration sewage treatment system 10 to treat rural domestic sewage, the sewage is concentrated into the three-stage septic tank 20 through the sewage pipe network in the rural area, and the pretreated water in the septic tank 20 flows to the water volume. The water in the adjustment tank 30 and the water volume adjustment tank 30 is regularly lifted to the tower biofilter 80, and the water from the bottom of the tower biofilter 80 flows to the infiltration wetland 50 by itself through the pipeline, and the water treated by the infiltration wetland 50 is stored in the infiltration The clean water of the wetland 50 is collected in the shaft 55 for standby use. Considering that the amount of sewage produced is mainly concentrated in the two periods of noon and evening, the sewage treated by anaerobic digestion in the septic tank 20 stays in the water volume adjustment tank for 10 hours, and the water is lifted to the tower type by the first water lifting device 40. above the biofilter 80, and use two nozzles to evenly spray water into the tower biofilter 80. In winter, the weather is cold, and the tower type biofilter 80 cannot operate normally, but the amount of sewage in winter is small, so the tower type biofilter 80 can be suspended, and the water in the water volume adjustment pool 30 can flow to the percolation by adjusting the valve. In the wetland 50 , the collection pipes 54 are uniformly distributed in a fan shape with the center of the circular area as the origin, and the collection pipes 54 have an inclination angle of 0-5° with respect to the horizontal plane, which facilitates the flow of water to the clean water collection shaft 55 .

Claims (8)

1. A minimally invasive excavation land infiltration rural domestic sewage treatment system is characterized in that: it includes a septic tank, a water volume adjustment tank, the first water lifting device and a percolation wetland; the outfall of the septic tank and the water volume adjustment tank The water inlet of the water volume adjustment tank is connected to the first outlet of the water volume adjustment tank, which is connected to the infiltration wetland through a guide pipe. The infiltration wetland includes a columnar water-retaining wall, soil as a percolation layer set in the columnar water-retaining wall, water distribution pipes, collection pipe, the clean water collection shaft with the bottom and the water pipe; the clean water collection shaft is set in the soil in the columnar partition wall, the water inlet of the water distribution pipe is connected with one end of the water pipe, and the other end of the water pipe is connected with the water volume adjustment tank The first outlet is connected, the height of the water inlet of the water distribution pipe corresponds to the height of the first outlet of the water volume adjustment tank, and the water outlet of the water distribution pipe diverts the water transported by the water volume adjustment tank to the soil in the columnar water barrier, collecting The pipe is set in the soil in the columnar water barrier, and one end of the collection pipe is connected with the clean water collection shaft, the other end of the collection pipe is closed, and a seepage hole is opened on the wall of the collection pipe to pass the water filtered through the soil. The seepage hole of the collecting pipe enters the collecting pipe, and is drained by the collecting pipe into the clean water collection shaft; the water inlet of the first water lifting device is arranged in the clean water collection shaft, so that the clean water collected in the clean water collection shaft Pull out and reuse. 2. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 1, characterized in that: the minimally invasive excavation land infiltration rural domestic sewage treatment system also includes a second water lifting device, a tower type biological filter pool, the water volume regulating pool also has a second drain, the second drain is located below the first drain, and close to the bottom of the water volume regulating pool; the water inlet of the second water lifting device communicates with the second drain, and the second The water outlet of the water lifting device is set above the tower-type biological filter to spray the water lifted from the water volume adjustment tank into the tower-type biological filter according to a predetermined amount. The tower-type biological filter includes a tower body and a tower body The plastic filler in the tower body is provided with a drain port at the bottom of the tower body, and the drain port of the tower body is connected with the water inlet of the water distribution pipe of the percolation wetland. Valve for water to flow out. 3. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 1, characterized in that: the hydraulic load of the infiltration wetland is 0.1-0.2m3/(㎡.d), and the The soil is covered with a 30cm insulation layer, and plants are planted on the insulation layer. 4. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 3, characterized in that: the water distribution pipe is arranged in the thermal insulation layer, and the installation depth is 20cm, and the water distribution pipe is close to the side of the clean water collection shaft There are 2 to 5 water distribution holes per meter. 5. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 1, characterized in that: one end of the collection pipe connected to the clean water collection shaft is lower than the other end of the collection pipe, and the collection pipe is used to infiltrate the wetland The dots in the center are distributed in a fan shape; except for the lower 1/4 area of the collection pipe surface, the other areas are covered with water seepage holes. 6. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 1, characterized in that: the collection pipe is set at 3 meters in the soil in the columnar water-retaining wall, and the collection pipe and the horizontal plane are in the range of 0-200 meters. The included angle is 5°, and the clean water collection shaft is 5 meters deep. 7. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 1, characterized in that: the septic tank includes a tank body and a partition, an overflow weir arranged in the tank body, a partition, an overflow The flow weir divides the tank body into acidification zone, anaerobic zone and sedimentation zone. The clear liquid in the acidification zone enters the anaerobic zone from the outlet in the middle of the partition, and the sewage treated by anaerobic digestion flows from the overflow weir to the sedimentation zone. Then it flows into the water volume regulating tank from the outfall of the septic tank. 8. The minimally invasive excavation land infiltration rural domestic sewage treatment system according to claim 7, characterized in that the residence time of the sewage treated by anaerobic digestion in the water volume adjustment tank is 10 hours.

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