Anti-clogging vertical subsurface flow wetland system

Abstract

The application discloses a kind of anti-clogging vertical subsurface flow wetland systems, which is divided into vertical subsurface flow area and central deep treatment purification area.The vertical subsurface flow area is symmetrically divided into two parts, and each part is laid with two layers of substrates.The first substrate layer (9) is biological ceramsite with small particle size, and the second substrate layer (8) is sponge iron with large particle size.A water distribution area and an inlet pipe (1) are arranged above the vertical subsurface flow area, and the inlet pipe (1) is uniformly distributed above the entire area of the vertical subsurface flow area.The lower bottom surface of the vertical subsurface flow area and the vertical partition wall form a certain angle (7).The vertical subsurface flow area is connected with the central deep treatment purification area through a drainage pipe (3), and the central deep treatment purification area discharges water through a siphon water pipe (4).A sludge discharge port (5) is arranged at the outer wall of the central deep treatment purification area close to the ground.The application solves the problems of short flow and easy pollution blocking of the existing wetland system.The system has good sewage purification effect, simple structure and easy maintenance and management.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of anti-clogging vertical subsurface flow wetland system, belongs to sewage treatment technical field. BACKGROUND

[0002] China is a country with very scarce freshwater resources, and water shortage has become an important factor restricting social and economic development. Efficient treatment of wastewater and water reuse are a difficult problem that must be overcome in today's society. Water pollution leads to deterioration of the water environment, directly affecting people's production and life.

[0003] The research and development of wastewater treatment technology and process have been continuously advancing. With the continuous improvement and development of wastewater treatment process or technology, the limitations of traditional biological methods, ecological methods and other technologies and processes in time or space have become apparent.

[0004] Constructed wetlands are artificial ecosystems that simulate natural wetlands and have been widely used in the purification of various polluted water bodies since the 1980s. The efficient removal of wastewater pollutants and the economic operation mode of constructed wetlands make them widely used. Compared with other wastewater treatment processes, constructed wetlands have many advantages: stable effluent, low construction and operation cost, simple maintenance, high treatment efficiency, wide applicability, and strong adaptability to load changes. Vertical subsurface flow wetlands are currently the most commonly used type of constructed wetland.

[0005] The vertical subsurface flow wetland system uses hydrophilic plants as surface greenery and different materials as substrate. Wastewater enters the wetland system from the water distribution area at the front end of the vertical subsurface flow wetland, is treated and purified, and is then discharged from the end of the wetland system. In the vertical subsurface flow wetland system, wastewater flows inside, which can fully utilize the biological membrane on the surface of the substrate, the rich root system of plants, and the interception of the surface substrate to improve the treatment effect and capacity of the wastewater. On the other hand, since the water flows below the ground surface, it has good heat preservation performance, the treatment effect is less affected by the climate, and the sanitary conditions are better.

[0006] The existing vertical subsurface flow wetland in the prior art has the problem of wetland system clogging during actual operation. Clogging is a major problem that hinders the long-term operation of the wetland system, which seriously affects the purification of wastewater. Accumulated pollutants clog the substrate pores, leading to a decrease in hydraulic conductivity, a slowdown in oxygen recovery in the substrate, a deterioration of the physical and chemical environment, a decrease in microbial activity, and a further slowdown in pollutant degradation rate. The existing technology lacks effective solutions to the problems of short flow and system clogging in constructed wetlands. SUMMARY

[0007] The present application aims at solving the problem of clogging of the wetland system in the actual operation of the vertical subsurface flow wetland in the prior art sewage treatment technology, and provides a vertical subsurface flow wetland system capable of preventing clogging.

[0008] The technical scheme realized by the present application is as follows: a vertical subsurface flow wetland system capable of preventing clogging, the system comprising a vertical subsurface flow area and a central deep treatment and purification area; the vertical subsurface flow area is divided into two symmetrical subareas, i.e., a vertical subsurface flow A area and a vertical subsurface flow C area, by the central deep treatment and purification area, and the central deep treatment and purification area is referred to as a central deep treatment and purification B area; the lower bottom surface of the vertical subsurface flow area and the vertical partition wall of the central deep treatment and purification area form a certain angle; a plurality of drainage pipes for connecting the vertical subsurface flow area and the central deep treatment and purification area are uniformly arranged along the length direction at the connection position between the lower bottom surface and the vertical partition wall, for connecting the vertical subsurface flow area and the central deep treatment and purification area, and for allowing the biofilm suspended in the water body in the vertical subsurface flow area and the impurities in the sewage to enter the central deep treatment and purification area along with the water body.

[0009] The system respectively takes in water from the symmetrical two-part vertical subsurface flow area and discharges water from the central deep treatment and purification area through a siphon water pipe.

[0010] The system is a rectangular area formed by an outer wall; the central deep treatment and purification area is a rectangular area formed by a vertical partition wall and part of the outer wall segment, and the siphon water pipe is arranged at equal distances beside the part of the outer wall segment, and the sewage treated by the central deep treatment and purification area is discharged from the wetland system through the siphon water pipe; and a sludge discharge port is arranged at the outer wall close to the ground surface of the central deep treatment and purification area.

[0011] The vertical subsurface flow area is paved with two layers of substrates, the first substrate layer is biological ceramsite with a small particle size, and the second substrate layer is sponge iron with a large particle size; and the bottom surface of the central deep treatment and purification area is planted with submerged plants.

[0012] A water distribution area is arranged above the vertical subsurface flow area, and a plurality of water inlet pipes are uniformly distributed in the entire area above the vertical subsurface flow area.

[0013] The vertical subsurface flow area is filled with soil between the bottom surface and the horizontal bottom of the wetland system, and is separated from the central deep treatment and purification area by a partition plate; and the central deep treatment and purification area is filled with soil between the bottom and the horizontal bottom of the wetland system.

[0014] The vertical subsurface flow wetland system capable of preventing clogging is a rectangular body, and the length of the vertical subsurface flow A area, the length of the central deep treatment and purification B area, and the length of the vertical subsurface flow C area are in the ratio of 1:1:1.

[0015] The angle between the lower bottom surface of the vertical subsurface flow area and the vertical partition wall of the central deep treatment and purification area is 60º~80º.

[0016] The upper end of the siphon water pipe is located beside the inner and outer walls of the central deep treatment and purification B area and is flush with the top layer of the central deep treatment and purification B area, and the lower end is outside the system.

[0017] The depth of the central deep treatment and purification area is deeper than the depth of the vertical undercurrent area; and the water outlet end of the drain pipe is located higher than the bottom surface of the central deep treatment and purification area.

[0018] The working principle of the present application is as follows,

[0019] After the preliminary pretreatment of the sewage, the sewage enters the wetland system through the water distribution area inlet pipe of the vertical undercurrent A area and the vertical undercurrent C area, the plants on the surface layer of the water distribution area absorb and degrade the pollutants in the sewage, and the impurities in the sewage are intercepted; the sewage is further treated by passing through the first substrate layer and the second substrate layer in the anti-clogging area of the vertical undercurrent A area and the vertical undercurrent C area; the sewage enters the central deep treatment and purification B area, and the bottom layer is planted with submerged plants to further absorb the pollutants such as nitrogen and phosphorus in the sewage; after a series of treatments, the sewage is discharged from the wetland system through the siphon water pipe.

[0020] When the siphon water pipe discharges water, the water level continuously decreases, and the lower bottom surface of the central deep treatment and purification B area is lower than the position of the drain pipe of the vertical undercurrent A area and the vertical undercurrent C area. In the process of continuous decrease of the water level, the biofilm suspended in the water body of the vertical undercurrent A area and the vertical undercurrent C area and the impurities in the sewage enter the central deep treatment and purification B area with the water body; in the later stage of siphon water pipe drainage, the water body of the vertical undercurrent A area and the vertical undercurrent C area is also emptied, and the biofilm and the impurities in the sewage also enter the central deep treatment and purification B area through the drain pipe.

[0021] When the siphon water pipe stops discharging water, the system enters the next round of sewage treatment process. In this process, the water body continuously enters the system from the water distribution area of the vertical undercurrent A area and the vertical undercurrent C area, and during this period, the water body also continuously enters the central deep treatment and purification B area from the drain pipe of the vertical undercurrent A area and the vertical undercurrent C area, and the water level rises synchronously in the system (vertical undercurrent A area, central deep treatment and purification B area, vertical undercurrent C area).

[0022] The present application has the advantages that the present application is a vertical undercurrent wetland system with anti-clogging function, which comprises a wetland system including a vertical undercurrent area and a central deep treatment and purification area, and the vertical undercurrent area is divided into two symmetrical sub-areas by the intermediate central deep treatment and purification area, and the biofilm and the impurities in the sewage are all discharged into the central deep treatment and purification area through the drain pipe arranged between the inclined bottom plate of the vertical undercurrent area and the bottom of the central deep treatment and purification area; the problems of short flow and system clogging in the prior art are solved, and the present application has the advantages of simple structure, good sewage purification effect, and long-term stable operation without clogging of the vertical undercurrent wetland. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Structure of the anti-clogging vertical subsurface flow wetland system according to the present application, front view;

[0024] Figure 2 Structure of the anti-clogging vertical subsurface flow wetland system according to the present application, top view;

[0025] In the figure, A is the vertical subsurface flow A area; B is the central deep treatment and purification B area; C is the vertical subsurface flow C area; 1 is the water inlet of the water distribution area; 2 is the backfill; 3 is the drain pipe; 4 is the siphon water pipe; 5 is the sludge discharge port; 6 is the silk screen Hydrilla verticillata; 7 is the angle of the partition; 8 is the sponge iron substrate; 9 is the biological ceramsite; 10 is the plant. DETAILED DESCRIPTION

[0026] The anti-clogging vertical subsurface flow wetland system according to the present embodiment is as shown in Figure 1 and Figure 2 .

[0027] The anti-clogging vertical subsurface flow wetland system according to the present embodiment is a rectangular pool-shaped structure constructed by outer walls; two vertical partition walls divide the wetland system into two symmetrical parts in the length direction, which are the vertical subsurface flow A area and the vertical subsurface flow C area, respectively; and the area between the two vertical partition walls is the central deep treatment and purification B area.

[0028] As can be seen from the entire process of treating sewage by the anti-clogging vertical subsurface flow wetland system, after the preliminary pretreatment of sewage, the sewage enters the wetland system through the water inlet pipe 1 of the top water distribution area of the vertical subsurface flow A area and the vertical subsurface flow C area, the plants 10 (acorus calamus) on the surface of the water distribution area absorb and degrade the pollutants in the sewage, and the impurities in the sewage are intercepted. The plants 10 (acorus calamus) absorb the pollutants such as nitrogen and phosphorus in the sewage, grow and reproduce, and are cut when they grow to a certain extent.

[0029] The sewage flows to the first substrate layer 9 and the second substrate layer 8 of the anti-clogging area of the vertical subsurface flow A area and the vertical subsurface flow C area through the plants on the surface of the water distribution area of the vertical subsurface flow A area and the vertical subsurface flow C area, and enters the central deep treatment and purification B area through the drain pipe at the connection between the lower bottom surface of the vertical subsurface flow A area and the vertical subsurface flow C area and the vertical partition wall of the central deep treatment and purification B area; the sewage is further treated by the first substrate layer 9 and the second substrate layer 8 in the anti-clogging area of the vertical subsurface flow A area and the vertical subsurface flow C area. The substrates in the substrate layers and the microorganisms attached to the substrates remove the pollutants such as nitrogen, phosphorus and organic matter in the sewage through a series of physical, chemical and biological methods, such as absorption, adsorption, filtration, ion exchange and complexation reaction.

[0030] The sewage enters the central deep treatment and purification B area, and the submerged plants 6 on the bottom layer further absorb the pollutants such as nitrogen and phosphorus in the sewage, grow and reproduce, and are cut when they grow to a certain extent.

[0031] After a series of sewage treatment, through the central deep purification B area outside the wall, and the central deep purification B area at the top of the siphon water pipe 4 discharge wetland system.

[0032] After the treated sewage is discharged from the wetland system through the siphon water pipe 4, the water level of the central deep purification B area is located at the siphon water pipe 4, that is, the submerged plant at the bottom of the central deep purification B area. At this time, the sewage of vertical undercurrent A area and vertical undercurrent C area is continuously discharged into the central deep purification B area through the drain pipe 3.

[0033] Because the lower bottom surface of vertical undercurrent A area and vertical undercurrent C area forms a certain angle with the vertical partition wall, that is, the lower bottom surface of vertical undercurrent A area and vertical undercurrent C area is inclined, the biological membrane generated in the process of treating sewage with matrix and impurities in the sewage will not deposit at the bottom of vertical undercurrent A area and vertical undercurrent C area, but will be carried by the treated sewage through the drain pipe 3 into the central deep purification B area and deposit at the bottom of the central deep purification B area, and part of the pollutants will be further absorbed and treated by the submerged plants at the bottom.

[0034] After the water in the central deep purification B area is discharged, the sewage is continuously treated by vertical undercurrent A area and vertical undercurrent C area and then enters the central deep purification B area again. As the water level of the central deep purification B area rises, the water level of vertical undercurrent A area and vertical undercurrent C area also rises. In this process, the matrix in vertical undercurrent A area and vertical undercurrent C area is backwashed once, the biological membrane attached to the matrix is suspended in the water body, and enters the central deep purification B area when the water body is discharged next time. The sludge deposited at the bottom of the central deep purification B area is periodically dredged through the sludge discharge port 5 and discharged outside the system.

[0035] After a series of sewage treatment, the biological membrane and impurities generated in the process of sewage treatment will not deposit in vertical undercurrent A area and vertical undercurrent C area, greatly reducing the risk of wetland system blockage. And regularly dredged through the sludge discharge port 5, so that the anti-blocking vertical undercurrent wetland system is always in a high-efficiency, stable and long-term operation state.

Claims

1. A clog-resistant vertical subsurface flow wetland system, characterized in that, The system comprises a vertical subsurface flow area and a central deep treatment and purification area; the vertical subsurface flow area is divided into two symmetrical subareas, i.e. vertical subsurface flow area A and vertical subsurface flow area C, by the central deep treatment and purification area, and the central deep treatment and purification area is referred to as central deep treatment and purification area B; the lower bottom surface of the vertical subsurface flow area and the vertical partition wall of the central deep treatment and purification area form a certain angle; at the connection between the lower bottom surface and the vertical partition wall, a plurality of drainage pipes for connecting the vertical subsurface flow area and the central deep treatment and purification area are uniformly arranged along the length direction, for connecting the vertical subsurface flow area and the central deep treatment and purification area, and for allowing the biofilm suspended in the water body in the vertical subsurface flow area and the impurities in the sewage to enter the central deep treatment and purification area along with the water body; The system is a rectangular area formed by outer walls; the central deep treatment and purification area is a rectangular area formed by a vertical partition wall and part of the outer wall segments, and siphon pipes are arranged at equal distances beside the part of the outer wall segments, and the treated sewage in the central deep treatment and purification area is discharged out of the wetland system through the siphon pipes; a sludge discharge port is arranged at the outer wall of the central deep treatment and purification area close to the ground; the upper end of the siphon pipe is located beside the outer wall in the central deep treatment and purification area B and is flush with the top layer of the central deep treatment and purification area B, and the lower end is outside the system; The depth of the central deep treatment and purification area is deeper than that of the vertical subsurface flow area; the water outlet end of the drainage pipe is higher than the bottom surface of the central deep treatment and purification area; The vertical subsurface flow area is paved with two layers of substrates, the first substrate layer is biological ceramic with small particle size, and the second substrate layer is sponge iron with large particle size; the bottom surface of the central deep treatment and purification area is planted with submerged plants.

2. The anti-clogging vertical subsurface flow wetland system according to claim 1, wherein, A water distribution area is arranged above the vertical subsurface flow area, and a plurality of water inlet pipes are uniformly distributed above the entire area of the vertical subsurface flow area.

3. The anti-clogging vertical subsurface flow wetland system according to claim 1, wherein, The vertical subsurface flow area is filled with soil between the bottom surface and the horizontal bottom of the wetland system, and is separated from the central deep treatment and purification area by a partition.

4. The anti-clogging vertical subsurface flow wetland system according to claim 1, wherein, The central deep treatment and purification area is filled with soil between the bottom and the horizontal bottom of the wetland system.

5. The anti-clogging vertical subsurface flow wetland system according to claim 1, wherein, The anti-clogging vertical subsurface flow wetland system is a rectangular solid, and the length of the vertical subsurface flow area A: the length of the central deep treatment and purification area B: the length of the vertical subsurface flow area C is 1:1:

1.

6. The anti-clogging vertical subsurface flow wetland system according to claim 1, wherein, The angle between the lower bottom surface of the vertical subsurface flow area and the vertical partition wall of the central deep treatment and purification area is 60º~80º.

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