CN113149209A - Series vertical aerobic-anaerobic combined underground soil infiltration system - Google Patents

Series vertical aerobic-anaerobic combined underground soil infiltration system Download PDF

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CN113149209A
CN113149209A CN202110406910.XA CN202110406910A CN113149209A CN 113149209 A CN113149209 A CN 113149209A CN 202110406910 A CN202110406910 A CN 202110406910A CN 113149209 A CN113149209 A CN 113149209A
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layer
soil
water distribution
soil infiltration
pipe
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CN113149209B (en
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吴耀国
胡思海
孙然
郭茜
孟昭辉
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Northwestern Polytechnical University
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Northwestern Polytechnical University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • C02F3/306—Denitrification of water in soil
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a series vertical aerobic-anaerobic combined underground soil infiltration system which sequentially comprises a plant layer, a planting soil layer, a water distribution layer, a first soil infiltration layer, a first bearing layer, a second soil infiltration layer and a second bearing layer from top to bottom; a water distribution pipe is arranged in the water distribution layer, a water inlet is arranged at the top of the water distribution layer, and a water outlet is arranged at the bottom of the second bearing layer; the first bearing layer is provided with a vent pipe which is communicated with the outside air; cloth water layer, first bearing layer, second bearing layer all include rubble piece or coarse sand, and first soil filtration layer and second soil filtration layer all include the loess. The system of the invention presents the characteristic of upper layer stagnant water migration behavior in effluent geology during operation, and sewage undergoes the combination of distribution of aerobic environment → anaerobic environment → aerobic environment → anaerobic environment in the vertical seepage direction, thereby not only ensuring the mineralization of organic nitrogen, but also realizing the removal of mineralized nitrogen, and greatly improving the removal capacity of ammonia nitrogen and total nitrogen.

Description

Series vertical aerobic-anaerobic combined underground soil infiltration system
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a series vertical aerobic-anaerobic combined underground soil infiltration system.
Background
For small-flow and distributed domestic sewage treatment, the underground soil infiltration system has the advantages of good effect, low capital investment and operation cost, easy management and maintenance and the like, so the underground soil infiltration system is particularly favored in the domestic sewage treatment of rural towns and remote tourist areas, in particular to the construction process of new rural areas in loess areas of China. However, the disadvantages are also found to be significant in practice, such as large floor space, low removal rate of COD (chemical oxygen demand) and nitrogen, and the like, wherein especially the low removal rate of ammonia nitrogen is prominent and needs to be improved and improved.
In order to improve the efficiency of underground soil infiltration systems, attempts have been made to increase the purification capacity of the infiltration layer by introducing different media material layers or adding certain materials to the soil to construct a multi-stage system, such as patent CN105502656A, and researchers have also studied aeration into the infiltration layer to improve the effect of the system by chemical and biological action, such as patent CN111704241A and CN 105502656A. Although these attempts have met with some success, the efficiency of the system is improved. However, these improvements are mainly proposed from the perspective of single factor, and the attention on the joint action of multiple elements in the system function implementation is not enough, so that the original advantages of the system may be sacrificed, especially the characteristics of low capital investment and operation cost, easy management and maintenance, and the like. Therefore, attempts have been made to maximize the advantages of the system by means of enhanced denitrification, or by adopting a split-flow type or adding a biological matrix, which has the overall effect of improving the total nitrogen removal rate to a certain extent, but basically has no influence on the effluent quality (panjing et al, 2011); some researchers construct a deep underground soil infiltration system (Zhangliuyu, etc. 2013) with the depth of 5m to change the efficiency of space, but the deep underground soil infiltration system has large buried depth, so that the treated water is not easy to discharge, and the underground water buried depth of many places is less than 5m, thereby restricting the popularization and application of the deep underground soil infiltration system, and most importantly, the efficiency is improved to a limited extent.
Therefore, the current underground soil infiltration system still cannot well meet the requirements of high operation efficiency, small occupied area and low operation and maintenance cost.
Disclosure of Invention
In order to solve the defects in the prior art, the invention is inspired by the characteristics of the migration behavior of upper layer stagnant water in the field hydrology and geology, and fully considers the characteristics of organic carbon and nitrogen conversion in the sewage treatment process, provides a series vertical aerobic-anaerobic combined underground soil infiltration system, and solves the problems that the existing underground soil infiltration system cannot give consideration to high operation efficiency, small floor area and low operation and maintenance cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a series vertical aerobic-anaerobic combined underground soil infiltration system sequentially comprises a planting soil layer, a water distribution layer, a first soil infiltration layer, a first bearing layer, a second soil infiltration layer and a second bearing layer from top to bottom; a water distribution pipe is arranged in the water distribution layer; a water inlet is formed in the top of the water distribution layer, and a water outlet is formed in the bottom of the second bearing layer; a breather pipe is arranged in the first bearing layer, and one end of the breather pipe extends to be communicated with the outside air; the water distribution layer comprises broken stone blocks or coarse sand; the first bearing layer comprises crushed stone blocks or coarse sand; the first soil percolation layer comprises loess, the second soil percolation layer comprises loess, and the soil density of the first soil percolation layer is higher than that of the second soil percolation layer; the second bearing layer comprises crushed stone or coarse sand.
Preferably, the thickness of the planting soil layer is 45-55 cm; the thickness of the water distribution layer is 10-15 cm; the particle size of broken stone blocks or coarse sand in the water distribution layer is 3-5 cm.
Preferably, the thickness of the first bearing layer is 25-35 cm, and the particle size of broken stone blocks or coarse sand in the first bearing layer is 6-8 cm.
Preferably, the thickness of the second bearing layer is 15-20 cm, and the particle size of broken stone blocks or coarse sand in the second bearing layer is 6-8 cm.
Preferably, the thickness of the first soil infiltration layer is 110-140 cm, and the soil density of the first soil infiltration layer is 1.40-1.50 g/cm3。
Preferably, the thickness of the second soil infiltration layer is 80-95 cm, and the soil density of the second soil infiltration layer is 1.30-1.38 g/cm3。
Optionally, the water distribution pipes include a main water distribution pipe and a plurality of branch water distribution pipes disposed on two sides of the main water distribution pipe, the branch water distribution pipes are sequentially disposed along a length direction of the main water distribution pipe, the main water distribution pipe is disposed along a direction from a water inlet to a water outlet, and a plurality of water permeable holes are disposed on the branch water distribution pipes.
Optionally, the vent pipe comprises a horizontal pipe and a vertical pipe, the horizontal pipe is laid in the first bearing layer, one end of the vertical pipe is communicated with the horizontal pipe, and the other end of the vertical pipe upwards sequentially penetrates through the first soil infiltration layer, the water distribution layer and the planting soil layer and extends into the outside air; and one side of the horizontal pipe, which is positioned on the second soil infiltration layer, is provided with a plurality of air holes.
Further, a plant layer is formed above the planting soil layer, and the plant layer comprises holly, Chinese rose or pepper trees.
Furthermore, the soil infiltration system also comprises an impervious wall, the impervious wall is arranged around the periphery and the bottom of the soil infiltration system, and the bottom of the impervious wall is provided with the water outlet; the thickness of the anti-seepage wall is 5-10 cm.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the system is in operation, sewage is subjected to the combination of distribution of aerobic environment → anaerobic environment → aerobic environment → anaerobic environment in the vertical seepage direction, thereby not only ensuring the mineralization effect on organic nitrogen, but also realizing the removal effect on mineralized nitrogen, greatly improving the removal capacity on ammonia nitrogen and total nitrogen, and improving the quality of effluent.
(2) The invention fully utilizes the hydraulic gradient to realize the self-flow of the sewage in the system; meanwhile, when air is introduced into the first bearing layer through the vent pipe, the automatic transfer of oxygen in the atmosphere to the treated water is realized by utilizing the action of a gas-liquid interface, so that the recovery of dissolved oxygen is realized, namely, the running of the system is ensured from two aspects without the driving of external power, and the unpowered running of the system is realized.
(3) The system can dissolve the oxidation in the atmosphere into the underground water by utilizing the connectivity of the aeration zone and the atmosphere, construct an environment which is distributed along a vertical underground seepage path of the sewage in a serial connection manner of aerobic → anaerobic → aerobic → anaerobic, lead the nitrification → denitrification → nitrification → denitrification of the pollutants in the water to be carried out iteratively, strengthen the purification capacity of the soil medium for removing nitrogen and carbon, show all the advantages of the underground soil seepage system as far as possible, and realize the consideration of the advantages of high operation efficiency, small floor area, low operation and maintenance cost and the like of the underground soil seepage system.
Drawings
Fig. 1 is a schematic view of the structure of the subsurface soil infiltration system of the present invention.
The various reference numbers in the figures illustrate:
1-a plant layer, 2-a planting soil layer, 3-a water distribution layer, 4-a first soil percolation layer, 5-a first bearing layer, 6-a second soil percolation layer, 7-a second bearing layer, 8-a water distribution pipe, 9-an air pipe, 10-a water outlet and 11-a seepage-proofing wall;
(9-1) -horizontal tube, (9-2) -vertical tube.
Detailed Description
The invention is inspired by the characteristics of upper layer stagnant water migration behavior in the field hydrology and geology, and fully considers the characteristics of organic carbon and nitrogen conversion in the sewage treatment process, and provides a series vertical aerobic-anaerobic combined underground soil infiltration system which is composed of an upper underground soil infiltration subsystem and a lower underground soil infiltration subsystem which are relatively independent and vertically arranged in series. The upper underground soil infiltration subsystem sequentially comprises a planting soil layer 2, a water distribution layer 3, a first soil infiltration layer 4 and a first supporting layer 5 from top to bottom, a water distribution pipe 8 is arranged in the water distribution layer 3, and the water distribution layer 3 comprises broken stones or coarse sand; the first supporting layer 5 also comprises crushed stone or coarse sand and the first soil infiltration layer 4 comprises loess. The lower underground soil infiltration subsystem sequentially comprises a second soil infiltration layer 6 and a second supporting layer 7 from top to bottom, the second soil infiltration layer 6 comprises loess, and the second supporting layer 7 comprises crushed stone blocks or coarse sand.
The soil density of the first soil infiltration layer 4 is higher than that of the second soil infiltration layer 6, the soil density of the first soil infiltration layer 4 is high, water in the first soil infiltration layer flows slowly, the soil density of the second soil infiltration layer 6 is low, water in the second soil infiltration layer flows quickly, and therefore the phenomenon of 'water stagnation in the upper layer' can be formed.
When the underground soil infiltration system based on the structure works, firstly, sewage flows out of an overflow type water outlet of the upper soil infiltration subsystem and enters the water distribution pipe 8 to be uniformly distributed; in the sewage from top to bottom in the sub-system section, most SS, P and COD in the sewage are removed under the combined action of the adsorption effect of soil particles and the action of aerobic microorganisms, ammonia nitrogen participates in the aerobic nitrification and is converted into nitrate nitrogen, and macromolecular organic matters are converted into micromolecular organic matters. The water flow is continuously consumed by dissolved oxygen in the seepage process to enable the first soil seepage layer 4 to be converted into an anoxic environment or even an anaerobic environment, chemical substances in the sewage mainly participate in the action of anaerobic organisms at the moment, and the heterotrophic denitrification effect is generated to convert nitrate nitrogen into nitrogen, so that organic matters are further mineralized, the biochemical property of the sewage is improved, and part of organic nitrogen is converted into inorganic nitrogen. According to the hydrological and geological theory and the chemical theory of the soil environment, the existence of the first supporting layer 5 with low density and large pores (compared with the first soil infiltration layer 4 and the water distribution layer 3) inevitably forms upper-layer stagnant water in the hydrological and geological theory in the first soil infiltration layer 4, the first supporting layer 5 is an unsaturated water medium layer, and due to the existence of the vent pipe 9, the transfer of oxygen in the atmosphere to the water solution in the first supporting layer 5 is promoted, so that the content of dissolved oxygen is increased to form an aerobic environment. Thus, sewage containing certain dissolved oxygen participates in aerobic biochemical action and anaerobic biochemical action again in the process of flowing through the second soil percolation layer 6, so that the sewage undergoes aerobic action → anaerobic action → aerobic action → anaerobic action (namely vertical series connection action) in the vertical percolation direction, the nitrification action → denitrification action → nitrification action → denitrification action of pollutants in water are carried out iteratively, the purification capability of nitrogen and carbon removal and the like of a soil medium is enhanced, the interception and the conversion of SS, COD and nitrogen in the water are ensured to be thorough, and the removal rate of the SS, COD and nitrogen is obviously improved.
The crushed stone used in the present invention is preferably waste crushed stone.
Preferably, the soil density of the first soil infiltration layer 4 of the invention is 1.40 to 1.50g/cm3The soil density of the second soil infiltration layer 6 is 1.30-1.38 g/cm3(ii) a The thickness of the first soil infiltration layer 4 is preferably 110-140 cm, and the thickness of the second soil infiltration layer 6 is preferably 80-95 cm. Compared with the first soil infiltration layer 4, the density of the second soil infiltration layer 6 is small, so that the first supporting layer 5 is beneficial to forming an unsaturated zone for controlling the flow rate, and the thickness of the second soil infiltration layer 6 is small because the water quality is improved compared with that of the previous soil layer (namely the first soil infiltration layer 4), and the thicker soil layer is not needed to be arranged on the previous soil layer, so that the cost is increased, and the whole area of the system is increased.
The thickness of the water distribution layer 3 is preferably 10-15 cm, and the particle size of broken stone blocks or coarse sand in the water distribution layer 3 is preferably 3-5 cm.
In the invention, the first supporting layer 5 is mainly used for forming an unsaturated water layer to enable the system to generate 'upper layer stagnant water', preferably, the thickness of the first supporting layer 5 is 25-35 cm, and the particle size of broken stone blocks or coarse sand in the first supporting layer 5 is 6-8 cm.
The second supporting layer 7 is mainly used for collecting and discharging system treatment water, preferably, the thickness of the second supporting layer 7 is 15-20 cm, and the particle size of broken stone blocks or coarse sand in the second supporting layer 7 is 6-8 cm.
The water distribution pipe 3 comprises a main water distribution pipe and a plurality of branch water distribution pipes arranged on two sides of the main water distribution pipe, wherein the branch water distribution pipes are sequentially arranged along the length direction of the main water distribution pipe, the main water distribution pipe is arranged along the direction from a water inlet to a water outlet 10, a plurality of water permeable holes are formed in the branch water distribution pipes, and the pore diameter of each water permeable hole is 0.3-0.6 cm.
The air pipe 9 comprises a horizontal pipe 9-1 and a vertical pipe 9-2, wherein the horizontal pipe 9-1 is laid in a first supporting layer 5, one end of the vertical pipe 9-2 is communicated with the horizontal pipe 9-1, and the other end of the vertical pipe 9-2 upwards penetrates through a first soil infiltration layer 4, a water distribution layer 3 and a planting soil layer 2 in sequence and extends into the outside air. A plurality of air holes are arranged on one side of the horizontal pipe 9-1, which is positioned on the second soil infiltration layer 6, and the aperture of each air hole is 0.8-1 cm.
According to the invention, plants are planted above the planting soil layer 2 to form the plant layer 1, and the plant layer 1 comprises holly, Chinese rose or pepper trees. Besides the beauty, the other consideration of the plant layer 1 is that the root systems of the plant layer are moderate and about 0.5m, and the plant layer can absorb and fix water and pollutants thereof to a certain extent.
In order to prevent sewage from permeating outside the system, the whole system is also provided with a seepage-proof wall 11, the seepage-proof wall 11 is arranged around the periphery and the bottom of the soil infiltration system, and the bottom of the seepage-proof wall 11 is provided with a water outlet 10. The impervious wall 11 is built by concrete, and the thickness is 5-10 cm.
In the present invention, unless otherwise specified, the terms of orientation such as "upper, lower, bottom, and top" are generally defined with reference to the drawing plane of the corresponding drawing, and "inner and outer" are defined with reference to the outline of the corresponding drawing.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be understood broadly, and may be, for example, fixedly connected or detachably connected or integrated; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
The present invention is not limited to the following embodiments, and various specific technical features described in the following embodiments may be combined in any suitable manner without contradiction, as long as they do not depart from the idea of the present invention, and should be considered as the disclosure of the present invention.
Examples
In the embodiment, the underground soil infiltration system provided by the invention is adopted to treat rural domestic sewage in the village of the king store in the three-primary county in Shaanxi province, Xiyangyang City. The experiment of the embodiment is carried out in a wasteland outside a small village of a rural farmhouse in the king shop of the three-primary county, Xianyang, Shaanxi province, and the experiment time is 1-2 months in 2021 years. The underground soil infiltration system is structurally shown in figure 1, and sequentially comprises the following components from top to bottom: the plant layer 1, the planting soil layer 2, the water distribution layer 3, the first soil infiltration layer 4, the first supporting layer 5, the second soil infiltration layer 6 and the second supporting layer 7, and the periphery and the bottom of the infiltration system are provided with impervious walls 11.
The plant layer 1 is planted with holly and China rose, and the planting soil layer 2 is composed of cultivation soil with the thickness of 50 cm; the water distribution layer 3 is 15cm thick and is composed of coarse sand with the grain size of about 4 cm; the water distribution pipes 8 are distributed in the water distribution layer 3, each water distribution pipe 8 consists of a DN10PVC main water distribution pipe and a DN5PVC branch water distribution pipe, the main water distribution pipe is arranged along the direction from the water inlet to the water outlet 10, the branch water distribution pipes are positioned at two sides of the main water distribution pipe and are vertical to the main water distribution pipe, and a plurality of water permeable holes with the hole diameter of 0.5cm are arranged on the branch water distribution pipes; the first soil filtration layer 4 is composed of local loess and has a soil thickness of 1.3m and a density of about 1.4g/cm3. The first support layer 5 has a thickness of 30cm and is made of coarse sand having a particle size of about 6 cm. The horizontal pipe 9-1 is DN5PVC vent pipe, the vertical pipe 9-2 is DN10PVC vent pipe, and a plurality of air holes with the aperture of 0.5cm are arranged on the two horizontal sides and the downward side. The horizontal pipes 9-1 are distributed in the first supporting layer 5 and are connected with the vertical pipes 9-2 through tee joints. The second soil infiltration layer 6 is composed of local loess and has a soil thickness of 0.9m and a density of about 1.3g/cm3(ii) a The thickness of the second supporting layer 7 is about 15cm, and the second supporting layer is made of coarse sand with the grain size of about 7 cm; the diaphragm wall 11 is 10cm thick and is constructed of C20 concrete.
The treated water is rural domestic sewage, and the treatment capacity is about 12m3D, hydraulic load of 0.2m3/m2D, feeding water by adopting a continuous dosing mode, wherein the water quality index COD of the fed water is 123-208 mg/L, the ammonia nitrogen is 24.2-43.8 mg/L, the nitrate nitrogen is 1.85-2.78 mg/L, the total nitrogen is 34.12-56.87 mg/L, and the total phosphorus is 2.5-6.3 mg/L. The domestic sewage is treated by the system in the embodiment and is continuously treated for 40 days, and the effluent quality index COD is 20.5-23.3 mg/L and ammonia nitrogen1.2-2.3 mg/L, 1.47-2.35 mg/L nitrate nitrogen, 2.7-3.4 mg/L total nitrogen and 0.05-0.08 mg/L total phosphorus. The main conventional water quality indexes basically meet the class-A class standard limit value of pollutant discharge standard GB 18918-2002 of urban sewage treatment plant.
Test results show that the system of the invention has stable operation and good pollutant removal effect; in addition, the air temperature in the system operation time interval is known to be 25 to-12 ℃ in the three primary counties in Guanzhong of 1-2 months in 2021, and the system operation problem is solved in the period, so that the system provided by the invention can maintain a stable treatment effect even under a low air temperature condition (about-6 ℃), and the underground soil infiltration system can realize the consideration of multiple advantages of high operation efficiency, small occupied area, low operation and maintenance cost and the like.

Claims (10)

1. The series vertical aerobic-anaerobic combined underground soil infiltration system is characterized by sequentially comprising a planting soil layer (2), a water distribution layer (3), a first soil infiltration layer (4), a first bearing layer (5), a second soil infiltration layer (6) and a second bearing layer (7) from top to bottom;
a water distribution pipe (8) is arranged in the water distribution layer (3); a water inlet is formed in the top of the water distribution layer (3), and a water outlet (10) is formed in the bottom of the second supporting layer (7); a vent pipe (9) is arranged in the first bearing layer (5), and one end of the vent pipe (9) extends to be communicated with the outside air;
the water distribution layer (3) comprises broken stone blocks or coarse sand; the first bearing layer (5) comprises crushed stone or coarse sand; the first soil percolation layer (4) comprises loess, the second soil percolation layer (6) comprises loess, and the soil density of the first soil percolation layer (4) is higher than that of the second soil percolation layer (6); the second supporting layer (7) comprises crushed stone or coarse sand.
2. The series vertical aerobic-anaerobic combined underground soil infiltration system according to claim 1, characterized in that the planting soil layer (2) has a thickness of 45-55 cm; the thickness of the water distribution layer (3) is 10-15 cm; the particle size of the broken stone blocks or coarse sand in the water distribution layer (3) is 3-5 cm.
3. The series vertical aerobic-anaerobic combined underground soil infiltration system according to claim 1, characterized in that the thickness of the first supporting layer (5) is 25-35 cm and the particle size of the crushed stone blocks or coarse sand in the first supporting layer (5) is 6-8 cm.
4. The series vertical aerobic-anaerobic combined underground soil infiltration system according to claim 1, characterized in that the thickness of the second supporting layer (7) is 15-20 cm, and the particle size of the crushed stone blocks or coarse sand in the second supporting layer (7) is 6-8 cm.
5. The series vertical type aerobic-anaerobic combined underground soil infiltration system according to the claim 1, characterized in that the thickness of the first soil infiltration layer (4) is 110-140 cm, and the soil density of the first soil infiltration layer (4) is 1.40-1.50 g/cm3。
6. The series vertical type aerobic-anaerobic combined underground soil infiltration system according to claim 1, wherein the thickness of the second soil infiltration layer (6) is 80-95 cm, and the soil density of the second soil infiltration layer (6) is 1.30-1.38 g/cm3。
7. The combined vertical type underground soil infiltration system with aerobic and anaerobic features as claimed in claim 1, wherein the water distribution pipes (3) comprise a main water distribution pipe and a plurality of branch water distribution pipes disposed on both sides of the main water distribution pipe, the branch water distribution pipes are sequentially disposed along the length of the main water distribution pipe, the main water distribution pipe is disposed along the direction from the water inlet to the water outlet (10), and the branch water distribution pipes are opened with a plurality of water permeable holes.
8. The combined vertical aerobic-anaerobic underground soil infiltration system according to claim 1, characterized in that the aeration pipe (9) comprises a horizontal pipe (9-1) and a vertical pipe (9-2), the horizontal pipe (9-1) is laid in the first supporting layer (5), one end of the vertical pipe (9-2) is communicated with the horizontal pipe (9-1), and the other end of the vertical pipe extends upwards to the outside air through the first soil infiltration layer (4), the water distribution layer (3) and the planting soil layer (2) in sequence; and a plurality of air holes are formed in one side of the horizontal pipe (9-1) positioned on the second soil infiltration layer (6).
9. The combined vertical aerobic-anaerobic infiltration system of underground soil according to claim 1, characterized in that above the planting soil layer (2) is formed a plant layer (1), the plant layer (1) comprising wintergreen, Chinese rose or prickly ash trees.
10. The combined vertical type aerobic-anaerobic underground soil infiltration system according to the claim 1, which is characterized in that the soil infiltration system also comprises a impervious wall (11), the impervious wall (11) is arranged around the periphery and the bottom of the soil infiltration system, the bottom of the impervious wall (11) is provided with the water outlet (10); the thickness of the impervious wall (11) is 5-10 cm.
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CN104528940A (en) * 2014-11-26 2015-04-22 安徽新天环保科技有限公司 Soil percolation system applicable to sewage ecological processing
CN110526402A (en) * 2019-10-11 2019-12-03 厦门元谷理工环保服务有限公司 A kind of array soil sewage disposal system
CN111484189A (en) * 2019-11-18 2020-08-04 西北农林科技大学 Slope soil infiltration system for treating rural domestic sewage

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