CN115072943B

CN115072943B - High-load underground infiltration system and treatment process for domestic sewage

Info

Publication number: CN115072943B
Application number: CN202210885054.5A
Authority: CN
Inventors: 乔治; 白娟; 钱菊; 王健
Original assignee: Guizhou Baorunde Environmental Protection Technology Co ltd
Current assignee: Guizhou Baorunde Environmental Protection Technology Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-04-07
Anticipated expiration: 2042-07-26
Also published as: CN115072943A

Abstract

The scheme discloses a domestic sewage high-load subsurface infiltration system in the technical field of sewage treatment, which is different from the prior art in that: an adjusting layer is arranged below the covering layer and comprises an adjusting plate, an adjusting cylinder, a partition plate, a supporting groove and a hydraulic cylinder, the opening end of the adjusting cylinder is connected to the adjusting plate, liquid leakage holes and adjusting holes are uniformly distributed in the adjusting plate, the adjusting holes are communicated with the adjusting cylinder, and a liquid inlet hole is annularly arranged on the outer wall of the adjusting cylinder; the support groove is provided with a liquid outlet hole and a connecting hole, connecting pipes are uniformly distributed in the support groove and are communicated with the adjusting hole and the connecting hole, a through groove is formed in the lower wall body of the support groove, and the partition plate is connected in the through groove in a sliding manner and extends out of the treatment pool; a plurality of rows of liquid guide holes and liquid passing holes are uniformly distributed on the isolation plate; gravel is filled between the adjusting cylinders and between the connecting pipes, and the adjusting layer is communicated with a liquid inlet pipe and a plurality of blow-off pipes. The domestic sewage high-load subsurface infiltration system effectively avoids the problem that the similar system is easy to block in the prior art.

Description

High-load underground infiltration system and treatment process for domestic sewage

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a domestic sewage high-load underground infiltration system and a treatment process.

Background

Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, industrial enterprise toilets and the like. Pollutants contained in the domestic sewage are mainly organic matters, such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like, and the organic matters in the domestic sewage are extremely unstable and easy to decay to generate stink, so the domestic sewage needs to be treated in time.

Currently, methods for treating domestic sewage mainly include biological contact oxidation, modified activated sludge process (such as SBR), anaerobic-anoxic-aerobic process, constructed wetland technology, subsurface infiltration technology, and the like. Among them, the subsurface infiltration technology is widely used because it is buried underground, does not emit odor, does not affect landscape, and has low maintenance cost.

At present, the infiltration system mainly includes drainage blanket, ventilation layer, essence layer, the scattered water layer that sets gradually from bottom to top in processing pond and the processing pond, and the coarse filtration layer is provided with the water distribution pipe net, and the scattered water layer is provided with the scattered water pipe net, essence layer is provided with the regulation pipe net, the ventilation layer is provided with the ventilation pipe net, and the drainage blanket is provided with drainage pipe net, and each layer sets up corresponding filter material. In the use process of the underground infiltration system, although domestic sewage is treated by the grid tank, the anaerobic sedimentation tank and the regulating tank, the domestic sewage also contains a large amount of granular organic matters, and after the granular organic matters enter the underground infiltration system, filter materials of a top covering layer and a rough filtering layer are easy to block; in addition, when the concentration of the organic matters is too high, microorganisms can be excessively increased, the porosity of each layer of filter material of the percolation system is reduced due to the microorganisms and extracellular polymers, the saturated permeation rate is reduced, and the blocking condition is further aggravated; in addition, when the underground infiltration system is used for treating domestic sewage, organic matters are decomposed into gases such as carbon dioxide, ammonia gas and hydrogen sulfide, and gases such as nitrous oxide and nitrogen generated by biological denitrification are easily blocked because filter materials of all layers are soaked in the domestic sewage in the using process of the infiltration system.

In order to solve the problems, patents with publication numbers CN1927733A, CN101302047B, CN102432105B and the like reduce the content of particulate organic matters in domestic sewage by strengthening primary treatment, and increase the oxygen supply to the system by a fan, thereby greatly improving the pollutant load of the system and the stability of the system; however, such a method has the following problems: 1. the primary treatment cost of the domestic sewage is increased; 2. the cost of oxygen supply is increased; 3. after a large amount of oxygen is introduced, the denitrification effect is poor.

Disclosure of Invention

The invention aims to provide a domestic sewage high-load underground infiltration system to solve the problem that the underground infiltration system is easy to block.

The domestic sewage high-load underground infiltration system comprises a treatment tank and a drainage layer, a ventilation layer, a fine filtration layer, an anti-blocking layer, a water dispersion layer, a coarse filtration layer and a covering layer which are sequentially arranged in the treatment tank from bottom to top, wherein the water dispersion layer is provided with a water dispersion pipe network, the ventilation layer is provided with a ventilation pipe network, and the drainage layer is provided with a drainage pipe network;

an adjusting layer is arranged between the covering layer and the coarse filtering layer, the adjusting layer comprises an isolation assembly and an adjusting assembly, the adjusting assembly comprises an adjusting plate and a plurality of adjusting cylinders, one end of each adjusting cylinder is open, the open end of each adjusting cylinder is fixedly connected to the adjusting plate, a plurality of rows of liquid leaking holes are uniformly distributed in the adjusting plate, adjusting holes are formed in the centers of every two adjacent liquid leaking holes and communicated with the open end of each adjusting cylinder, a liquid inlet hole is formed in the outer wall of each adjusting cylinder in an encircling manner, and the liquid inlet hole is close to one end, far away from the opening, of each adjusting cylinder;

the isolation assembly comprises an isolation plate and a U-shaped support groove, four side walls of the support groove and the adjusting plate are attached to the inner wall of the treatment pool, the bottom of the adjusting plate is in lap joint with the top of the support groove, a plurality of rows of liquid outlet holes are uniformly distributed at the bottom of the support groove and are positioned below the liquid leakage holes, a connecting hole is formed in the center of each of the four adjacent liquid outlet holes, a plurality of rows of connecting pipes are uniformly distributed in the support groove, two ends of each connecting pipe are respectively correspondingly communicated with the upper and lower adjusting holes and the connecting holes, a through groove is formed in the lower wall of the support groove, the isolation plate is connected in the through groove in a sliding mode, one end of the isolation plate extends out of the treatment pool, and a hydraulic cylinder for driving the isolation plate to slide is mounted on the outer wall of the treatment pool; a plurality of rows of liquid guide holes are uniformly distributed on the isolation plate, the size and the arrangement of the liquid guide holes are consistent with those of the liquid outlet holes, and liquid through holes are formed between every two adjacent liquid guide holes in the same row; gravel is filled between the adjusting cylinders and between the connecting pipes, the adjusting layer is communicated with a liquid inlet pipe and a plurality of blow-off pipes, the liquid outlet end of the liquid inlet pipe is positioned on the plane where the adjusting cylinders are positioned, and the liquid inlet ends of the blow-off pipes are respectively positioned on the plane where the adjusting cylinders and the connecting pipes are positioned.

The working principle of the scheme is as follows: in the initial state, the liquid passing holes on the isolation plate are communicated with the connecting holes, the liquid guide holes are staggered with the liquid outlet holes, and the sewage discharge pipe is closed. Domestic sewage is treated by the grating tank, the anaerobic sedimentation tank and the regulating tank, then enters the gravel layer where the regulating cylinder is located through the liquid inlet pipe, and finally is discharged from the drainage pipe network after being purified through the water dispersion layer, the anti-blocking layer, the fine filtering layer, the ventilation layer and the drainage layer.

This scheme has following beneficial effect through the setting of adjustment layer:

1. the partition plate can be driven to slide in the through groove through the hydraulic cylinder, so that the liquid passing hole is communicated with the connecting hole, or the liquid guide hole is communicated with the liquid outlet hole; when the liquid passing hole is communicated with the connecting hole, the domestic sewage firstly enters the gravel layer on the adjusting plate, enters from the liquid inlet hole, and enters the rough filtering layer through the adjusting hole, the connecting pipe, the connecting hole and the liquid passing hole; when the liquid guide hole is communicated with the liquid outlet hole, domestic sewage firstly enters the gravel layer on the adjusting plate and then enters the coarse filtering layer through the liquid guide hole, the supporting groove, the liquid outlet hole and the liquid guide hole, so that the domestic sewage alternately enters the coarse filtering layer through the liquid guide hole and the liquid guide hole, the coarse filtering layer is prevented from being soaked in the domestic sewage all the time, the wet-dry ratio of the domestic sewage of the coarse filtering layer is reduced, the load of an underground infiltration system is favorably improved, and meanwhile, the gas is favorably discharged.

2. After entering the adjusting layer, most of granular organic matters in the domestic sewage are intercepted by gravels of the adjusting layer, and the organic matters in the adjusting groove can be discharged through the drain pipe, so that the primary treatment cost is reduced; in addition, most of organic matters are intercepted by the gravel of the adjusting layer, so that the content of the organic matters in the domestic sewage entering the lower part is greatly reduced, the risk that the drainage layer, the ventilation layer, the fine filtering layer, the anti-blocking layer, the water dispersion layer and the coarse filtering layer are blocked is reduced, the ventilation frequency and the ventilation time of the ventilation pipe network can be reduced, and the denitrification effect is enhanced.

3. When the content of organic matters in the domestic sewage is insufficient and COD/TN is less than 6, mail substances such as glucose, flour and the like are required to be added into the domestic sewage for supplement, so that the denitrification effect is ensured. Through the setting of regulation layer, can add the living sewage that the organic matter is not enough after collecting the organic matter that will adjust the layer and intercept to reduce the input of materials such as glucose, reduce cost.

4. Compared with the prior art in the decomposition of organic matter is realized through oxygenation to reduce the system and block up, this scheme is direct to be held back excessive organic matter through setting up of adjustment layer, has reduced the organic matter content who enters into coarse filtration layer, water-dispersing layer, anti-blocking layer, essence layer, ventilation layer and drainage blanket from the source, thereby does not need to increase a large amount of oxygen as the replenishment, has fully improved the denitrification effect.

Furthermore, the height of the adjusting cylinder is 20-30 CM, and the distance between the liquid inlet hole and the opening end of the adjusting cylinder is 15-18 CM; the depth of the supporting groove is 10-20 CM, and the particle size of the gravel of the adjusting layer is 10-30 mm. The height of the adjusting cylinder is 20-30 CM, and the depth of the supporting groove is 10-20 CM, so that the domestic sewage has proper filtering depth in the adjusting layer, and the phenomenon that the interception of organic matters is too little or excessive is avoided.

Furthermore, the liquid outlet end of the liquid inlet pipe and the liquid inlet end of the sewage discharge pipe are both provided with an isolation net. The gravel is prevented from being directly blocked at the liquid outlet end of the liquid inlet pipe and the liquid inlet end of the sewage discharge pipe by the arrangement of the isolation net.

Further, the bottom of the covering layer and the drainage layer is an in-situ soil layer, a cement hardened layer or a floor brick layer. The covering layer is an original soil layer and can be used for planting plants; the cement hardened layer or the floor tile layer can be used as a parking lot and the like.

Furthermore, the filling thickness of the drainage layer, the ventilation layer, the fine filtration layer, the anti-blocking layer, the water dispersion layer and the coarse filtration layer is 9-12 CM.

Further, the coarse filter layer consists of river sand with the particle size of 5-15 mm; the water dispersion layer is formed by mixing the melon and rice stones with the grain sizes of 3-10 mm and river sand; the anti-blocking layer and the ventilation layer are both composed of the melon and rice stones with the grain size of 15-40 mm; the fine filtering layer is formed by mixing river sand, melon and rice stone, polyurethane foam, zeolite and quartz sand with the particle size of 2-10 mm; the drainage layer is formed by mixing melon and rice stones with the grain diameters of 10-30 mm and river sand. The domestic sewage is effectively purified through the percolation of the adjusting layer, the coarse filtering layer, the water dispersing layer, the anti-blocking layer, the fine filtering layer, the ventilating layer and the water draining layer and the action of microorganisms. In addition, the fine filtering layer is formed by mixing river sand, melon and rice stone, polyurethane foam, zeolite and quartz sand with the particle size of 2-10 mm, the fine filtering effect can be obviously improved, and particularly, the load of the fine filtering layer is improved while the percolation effect of the fine filtering layer is improved by adding the polyurethane foam.

Based on domestic sewage high load underground infiltration system, this application still provides the domestic sewage treatment process based on it, includes the following step:

step one, connecting a liquid inlet pipe with a submersible sewage pump in a regulating tank, and then intermittently pumping domestic sewage treated by a grid tank, an anaerobic sedimentation tank and the regulating tank into a regulating layer through the submersible sewage pump;

secondly, during pumping the domestic sewage, the isolating plate is driven to move in a reciprocating mode through the hydraulic cylinder every 5-10 min, so that the liquid outlet holes and the connecting holes in the supporting grooves are opened alternately;

and step three, introducing air into the ventilation layer for 0.5 hour every 4 hours through a ventilation pipe network.

And further, before the domestic sewage is pumped into the regulating layer, the COD concentration and the TN concentration of the domestic sewage in the regulating tank are detected, the COD/TN of the domestic sewage in the regulating tank is ensured to be more than or equal to 6, and when the COD/TN of the domestic sewage is less than 6, organic matters are added into the domestic sewage until the COD/TN of the domestic sewage is more than or equal to 6. By detecting the COD concentration and the TN concentration of the domestic sewage in the regulating reservoir, the COD/TN of the domestic sewage is ensured to be more than or equal to 6, and the denitrification effect is enhanced.

Furthermore, the domestic sewage high-load underground infiltration system also comprises a liquid collecting tank, wherein a plurality of sewage discharge pipes are communicated with the liquid collecting tank, the highest position of the liquid collecting tank is lower than the lowest position of the adjusting layer, and the liquid outlet end of each sewage discharge pipe is connected with a ball float valve; when the submersible sewage pump pumps the domestic sewage into the regulating layer, the liquid outlet hole is kept separated and the connecting hole is opened, and the pumped domestic sewage flushes the regulating layer and then enters the liquid collecting tank until the liquid level reaches the height of the floating ball; when the COD/TN of the domestic sewage in the regulating tank is less than 6, the domestic sewage in the liquid collecting tank is pumped into the regulating tank. Through the arrangement of the liquid collecting tank, the organic matters in the adjusting layer can be conveniently collected regularly or irregularly, the organic matters can be repeatedly utilized, the throwing of the organic matters is reduced, and the cost is saved.

Further, the volume of the domestic sewage in the liquid collecting tank reaching the highest position is 10-20% of the total volume of the domestic sewage stored in the regulating tank. The proportion can effectively wash away the organic matter on the adjusting layer, and meanwhile, excessive domestic sewage is prevented from being discharged, so that the workload of a subsequent submersible sewage pump is increased.

Drawings

FIG. 1 is a schematic view showing the construction of a high load subsurface infiltration system for domestic sewage according to example 1 of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a top view of the adjustment plate of FIG. 1;

FIG. 4 is a top view of the support slot of FIG. 1 after being connected to a connecting tube;

FIG. 5 is a top view of the separator plate of FIG. 1;

FIG. 6 is a photograph of the high load subsurface infiltration system for domestic sewage of example 2 constructed in a town with a large area of six disks of water.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a liquid inlet pipe 1, a sewage discharge pipe 2, an isolation net 3, a treatment tank 4, a covering layer 5, gravels 6, an adjusting cylinder 7, a liquid inlet hole 8, a liquid leakage hole 9, a support groove 10, a connecting pipe 11, an isolation plate 12, a liquid guide hole 13, a coarse filtration layer 14, a water dispersion layer 15, an anti-blocking layer 16, a fine filtration layer 17, a ventilation layer 18, a drainage layer 19, in-situ soil 20, a ventilation pipe network 21, a drainage pipe network 22, a water dispersion pipe network 23, an adjusting plate 24, a liquid outlet hole 25 and a liquid passing hole 26.

Example 1 is substantially as shown in figures 1 to 5 of the accompanying drawings: the domestic sewage high-load underground infiltration system comprises a treatment tank 4 and an in-situ soil 20 layer, a drainage layer 19, a ventilation layer 18, a fine filtration layer 17, an anti-blocking layer 16, a water dispersing layer 15, a coarse filtration layer 14, an adjusting layer and a covering layer 5 which are sequentially arranged in the treatment tank 4 from bottom to top, wherein the water dispersing layer 15 is provided with a water dispersing pipe network 23, the ventilation layer 18 is provided with a ventilation pipe network 21, and the drainage layer 19 is provided with a drainage pipe network 22; the covering layer 5 and the in-situ soil 20 layer both use in-situ soil 20; the filling thickness of the drainage layer 19, the ventilation layer 18, the fine filtration layer 17, the anti-blocking layer 16, the water dispersing layer 15 and the coarse filtration layer 14 is 9-12 CM; the coarse filter layer 14 is composed of river sand with the grain diameter of 5-15 mm; the water dispersion layer 15 is formed by mixing melon and rice stones and river sand with the grain sizes of 3-10 mm, and the volume ratio of the melon and rice stones to the river sand is 1-2; the anti-blocking layer 16 and the ventilation layer 18 are both made of the melon and rice stone with the grain diameter of 15-40 mm; the fine filtering layer 17 is formed by mixing river sand, melon and rice stone, polyurethane foam, zeolite and quartz sand with the particle size of 2-10 mm, wherein the volume ratio of the river sand to the melon and rice stone to the polyurethane foam to the zeolite to the quartz sand is 1-2; the drainage layer 19 is formed by mixing melon and rice stones and river sand with the grain diameters of 10-30 mm, and the volume ratio of the rice stones to the river sand is 1-2.

The adjusting layer comprises an isolation assembly and an adjusting assembly, the adjusting assembly comprises an adjusting plate 24 and a plurality of adjusting cylinders 7 with the height of 25CM, one end of each adjusting cylinder 7 is opened, the opening end of each adjusting cylinder 7 is fixedly connected to the corresponding adjusting plate 24, a plurality of rows of liquid leaking holes 9 are uniformly distributed on the corresponding adjusting plate 24, adjusting holes are formed in the centers of every two adjacent liquid leaking holes 9 and communicated with the opening end of the corresponding adjusting cylinder 7, a liquid inlet hole 8 is annularly arranged on the outer wall of each adjusting cylinder 7, and the distance between the liquid inlet hole 8 and the opening end of the corresponding adjusting cylinder 7 is 18CM;

the isolation assembly comprises an isolation plate 12 and a U-shaped support groove 10, the depth of the support groove 10 is 18CM, four side walls of the support groove 10 and an adjusting plate 24 are attached to the inner wall of the treatment pool 4, the bottom of the adjusting plate 24 is lapped on the top of the support groove 10, a plurality of rows of liquid outlet holes 25 are uniformly distributed at the bottom of the support groove 10, the liquid outlet holes 25 are positioned below the liquid leakage holes 9, connecting holes are formed in the centers of four adjacent liquid outlet holes 25, a plurality of rows of connecting pipes 11 are uniformly distributed in the support groove 10, two ends of each connecting pipe 11 are respectively correspondingly communicated with the upper and lower adjusting holes and the connecting holes, a through groove is formed in the lower wall of the support groove 10, the isolation plate 12 is connected in the through groove in a sliding mode, one end of the isolation plate extends out of the treatment pool 4, and a hydraulic cylinder for driving the isolation plate 12 to slide is mounted on the outer wall of the treatment pool 4; a plurality of rows of liquid guide holes 13 are uniformly distributed on the isolation plate 12, the size and the arrangement of the liquid guide holes 13 are consistent with those of the liquid outlet holes 25, and liquid holes 26 are arranged between every two adjacent liquid guide holes 13 in the same row; all pack full gravel 6 between the regulation section of thick bamboo 7 and between the connecting pipe 11, the particle diameter of the gravel 6 of regulating layer is 10 ~ 30mm, and the regulating layer intercommunication has feed liquor pipe 1 and many blow off pipes 2, and the play liquid end of feed liquor pipe 1 is located and adjusts section of thick bamboo 7 place plane, and the feed liquor end of many blow off pipes 2 is located respectively and adjusts section of thick bamboo 7 and connecting pipe 11 place plane, and the play liquid end of feed liquor pipe 1 and the feed liquor end of blow off pipe 2 all are equipped with separation net 3.

Example 2 differs from example 1 only in that: the sewage treatment device is characterized by further comprising a liquid collecting tank, wherein the plurality of sewage discharge pipes 2 are communicated with the liquid collecting tank, the highest position of the liquid collecting tank is lower than the lowest position of the adjusting layer, the liquid outlet end of each sewage discharge pipe 2 is connected with a ball float valve, a submersible sewage pump is arranged in the liquid collecting tank, the liquid outlet end of the submersible sewage pump is communicated with the adjusting tank, and the volume of the domestic sewage in the liquid collecting tank when the highest position is reached is 10% -20% of the total volume of the domestic sewage stored in the adjusting tank.

Example 3, a process for treating domestic sewage using the high load subsurface infiltration system for domestic sewage of example 1: the method comprises the following steps:

step one, a liquid inlet pipe 1 is connected with a submersible sewage pump in an adjusting tank, the COD concentration and the TN concentration of domestic sewage in the adjusting tank are detected, the COD/TN of the domestic sewage in the adjusting tank is ensured to be more than or equal to 6, and when the COD/TN6 of the domestic sewage is less than 6, organic matters such as glucose and flour are added into the domestic sewage until the COD/TN of the domestic sewage is more than or equal to 6; then intermittently pumping the domestic sewage treated by the grid tank, the anaerobic sedimentation tank and the regulating tank into the regulating layer by a submersible sewage pump;

secondly, during the period of pumping the domestic sewage, the partition plate 12 is driven to move in a reciprocating way by the hydraulic cylinder every 5-10 min, so that the liquid outlet holes 25 and the connecting holes on the supporting groove 10 are alternately opened;

and step three, introducing air into the ventilation layer 18 for 0.5 hour every 4 hours through a ventilation pipe network 21.

Example 4, a process for treating domestic sewage using the high load subsurface infiltration system for domestic sewage of example 2: the method comprises the following steps:

step one, a liquid inlet pipe 1 is connected with a submersible sewage pump in an adjusting tank, the COD concentration and the TN concentration of domestic sewage in the adjusting tank are detected, the COD/TN of the domestic sewage in the adjusting tank is ensured to be more than or equal to 6, when the COD/TN6 of the domestic sewage is less than 6 (when a domestic sewage high-load underground infiltration system is built for the first time, when the COD/TN6 of the domestic sewage is less than 6, organic matters such as glucose, flour and the like are added into the domestic sewage, the COD/TN6 of the domestic sewage is less than 6 in the subsequent process, the sewage in a liquid collecting tank is pumped into the adjusting tank through the submersible sewage pump in the liquid collecting tank and is detected again) until the COD/TN of the domestic sewage is more than or equal to 6; then intermittently pumping the domestic sewage treated by the grid tank, the anaerobic sedimentation tank and the regulating tank into the regulating layer by a submersible sewage pump; when the submersible sewage pump pumps the domestic sewage into the regulating layer, the liquid outlet hole 25 is kept blocked and the connecting hole is opened, and the pumped domestic sewage enters the liquid collecting tank after scouring the regulating layer until the liquid level reaches the height of the floating ball; when the COD/TN of the domestic sewage in the regulating tank is less than 6, pumping the domestic sewage in the liquid collecting tank into the regulating tank; if the domestic sewage entering the regulating tank keeps COD/TN more than or equal to 6 all the time, the regulating layer is flushed once every 10-15 days and then is discharged through the sewage discharge pipe 2;

step two, during the period of pumping the domestic sewage and after stopping discharging the sewage into the liquid collecting tank, driving the partition plate 12 to move in a reciprocating way by the hydraulic cylinder every 5-10 min so as to alternately open the liquid outlet holes 25 and the connecting holes on the supporting groove 10;

Compared with the prior art (without an adjusting layer), when the domestic sewage high-load underground infiltration system of the embodiment 1-2 is used for treating the domestic sewage, the amount of air introduced through the ventilation pipe network 21 is reduced by 1/2, and the amount of organic matters such as glucose, flour and the like can be saved by 1/3-2/3 per year by the arrangement of the liquid collecting tank.

The applicant builds two domestic sewage treatment systems in the new China and the large town of the Liuzhi district with six disks of water in Guizhou province in 2021, wherein the underground infiltration system adopts the structure in the embodiment 2, and the photo of the large town after being built is shown as the attached figure 6; the manner of use of the diafiltration system is shown in example 4, and the two-site diafiltration system inlet and outlet water detection data is shown in the following table:

the foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The domestic sewage high-load underground infiltration system comprises a treatment tank and a drainage layer, a ventilation layer, a fine filtration layer, an anti-blocking layer, a water dispersion layer, a coarse filtration layer and a covering layer which are sequentially arranged in the treatment tank from bottom to top, wherein the water dispersion layer is provided with a water dispersion pipe network, the ventilation layer is provided with a ventilation pipe network, and the drainage layer is provided with a drainage pipe network; the method is characterized in that: an adjusting layer is arranged between the covering layer and the rough filtering layer and comprises an isolating assembly and an adjusting assembly, the adjusting assembly comprises an adjusting plate and a plurality of adjusting cylinders, one end of each adjusting cylinder is open, the open end of each adjusting cylinder is fixedly connected to the adjusting plate, a plurality of rows of liquid leaking holes are uniformly distributed in the adjusting plate, adjusting holes are formed in the centers of every two adjacent liquid leaking holes and communicated with the open end of each adjusting cylinder, a liquid inlet hole is arranged on the outer wall of each adjusting cylinder in a sleeved mode, and the liquid inlet hole is close to one end, far away from the open end, of each adjusting cylinder;

the isolation assembly comprises an isolation plate and a U-shaped support groove, four side walls of the support groove and the adjusting plate are attached to the inner wall of the treatment pool, the bottom of the adjusting plate is in lap joint with the top of the support groove, a plurality of rows of liquid outlet holes are uniformly distributed at the bottom of the support groove and are positioned below the liquid leakage holes, a connecting hole is formed in the center of each of the four adjacent liquid outlet holes, a plurality of rows of connecting pipes are uniformly distributed in the support groove, two ends of each connecting pipe are respectively correspondingly communicated with the upper and lower adjusting holes and the connecting holes, a through groove is formed in the lower wall of the support groove, the isolation plate is connected in the through groove in a sliding mode, one end of the isolation plate extends out of the treatment pool, and a hydraulic cylinder for driving the isolation plate to slide is mounted on the outer wall of the treatment pool; a plurality of rows of liquid guide holes are uniformly distributed on the isolation plate, the size and the arrangement of the liquid guide holes are consistent with those of the liquid outlet holes, and liquid through holes are formed between every two adjacent liquid guide holes in the same row; gravel is filled between the adjusting cylinders and between the connecting pipes, the adjusting layer is communicated with a liquid inlet pipe and a plurality of sewage discharge pipes, the liquid outlet end of the liquid inlet pipe is positioned on the plane where the adjusting cylinders are positioned, and the liquid inlet ends of the sewage discharge pipes are respectively positioned on the plane where the adjusting cylinders and the connecting pipes are positioned.

2. The high load subsurface infiltration system for domestic sewage according to claim 1, characterized in that: the height of the adjusting cylinder is 20-30 CM, and the distance between the liquid inlet hole and the opening end of the adjusting cylinder is 15-18 CM; the depth of the supporting groove is 10-20 CM, and the particle size of the gravel of the adjusting layer is 10-30 mm.

3. The high load subsurface infiltration system of domestic sewage according to claim 2, wherein: and the liquid outlet end of the liquid inlet pipe and the liquid inlet end of the sewage discharge pipe are both provided with an isolation net.

4. The high load subsurface infiltration system for domestic sewage according to claim 3, wherein: the bottom of the covering layer and the drainage layer is an in-situ soil layer, a cement hardened layer or a floor brick layer.

5. The high load subsurface infiltration system for domestic sewage according to claim 4, wherein: the filling thickness of the drainage layer, the ventilation layer, the fine filtration layer, the anti-blocking layer, the water dispersion layer and the coarse filtration layer is 9-12 CM.

6. The high load subsurface infiltration system for domestic sewage according to claim 5, characterized in that: the coarse filter layer consists of river sand with the particle size of 5-15 mm; the water-dispersing layer is formed by mixing melon and rice stones with the grain sizes of 3-10 mm and river sand; the anti-blocking layer and the ventilation layer are both composed of the melon and rice stones with the grain size of 15-40 mm; the fine filtering layer is formed by mixing river sand, melon and rice stone, polyurethane foam, zeolite and quartz sand with the particle size of 2-10 mm; the drainage layer is formed by mixing melon and rice stones with the grain diameters of 10-30 mm and river sand.

7. The process for treating domestic sewage by using a high-load subsurface infiltration system for domestic sewage according to any of claims 1 to 6, wherein: the method comprises the following steps:

step two, during the period of pumping domestic sewage, the isolating plate is driven to move in a reciprocating way through the hydraulic cylinder every 5-10 min, so that the liquid outlet holes and the connecting holes on the supporting groove are alternately opened, and the method specifically comprises the following steps: the partition plate slides in the through groove, so that the liquid passing hole is communicated with the connecting hole, or the liquid guide hole is communicated with the liquid outlet hole; when the liquid passing hole is communicated with the connecting hole, the domestic sewage firstly enters the gravel layer on the adjusting plate, enters from the liquid inlet hole, and enters the rough filtering layer through the adjusting hole, the connecting pipe, the connecting hole and the liquid passing hole; when the liquid guide hole is communicated with the liquid outlet hole, the domestic sewage firstly enters the gravel layer on the adjusting plate and then enters the rough filtering layer through the liquid guide hole, the liquid outlet hole and the liquid guide hole;

8. The process for treating domestic sewage by using the high-load subsurface infiltration system for domestic sewage as claimed in claim 7, wherein: before the domestic sewage is pumped into the regulating layer, the COD concentration and the TN concentration of the domestic sewage in the regulating tank are detected, the COD/TN of the domestic sewage in the regulating tank is ensured to be more than or equal to 6, and when the COD/TN6 of the domestic sewage is less than 6, organic matters are added into the domestic sewage until the COD/TN of the domestic sewage is more than or equal to 6.

9. The process of treating domestic sewage by the domestic sewage high-load subsurface infiltration system according to claim 8, wherein: the domestic sewage high-load underground infiltration system also comprises a liquid collecting tank, a plurality of sewage discharge pipes are communicated with the liquid collecting tank, the highest position of the liquid collecting tank is lower than the lowest position of the adjusting layer, and the liquid outlet end of each sewage discharge pipe is connected with a ball float valve; when the submersible sewage pump pumps the domestic sewage into the regulating layer, the liquid outlet hole is kept isolated and the connecting hole is opened, and the pumped domestic sewage flushes the regulating layer and then enters the liquid collecting tank until the liquid level reaches the height of the floating ball; when the COD/TN of the domestic sewage in the regulating tank is less than 6, the domestic sewage in the liquid collecting tank is pumped into the regulating tank.

10. The process for treating domestic sewage by using the high-load subsurface infiltration system for domestic sewage as claimed in claim 9, wherein: the volume of the domestic sewage in the liquid collecting tank reaching the highest position is 10-20% of the total volume of the domestic sewage stored in the regulating tank.