CN108341495B - Three-phase overflow efficient oxygen supplementing wetland system - Google Patents

Three-phase overflow efficient oxygen supplementing wetland system Download PDF

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Publication number
CN108341495B
CN108341495B CN201810200487.6A CN201810200487A CN108341495B CN 108341495 B CN108341495 B CN 108341495B CN 201810200487 A CN201810200487 A CN 201810200487A CN 108341495 B CN108341495 B CN 108341495B
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wetland
area
water
central
overflow
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CN108341495A (en
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张建
庄林岚
郑欣慧
宋希冉
张一瑾
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Shandong University
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Shandong University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus

Abstract

The invention discloses a three-phase overflow high-efficiency oxygen supplementing wetland system, which solves the problems of poor reoxygenation effect, high energy consumption, low COD (chemical oxygen demand) and nitrogen and phosphorus removal rate, easy short flow phenomenon, organic pollution blockage and the like of the existing wetland, and divides a wetland bed into a central embedded area and a peripheral overflow area, so that the central embedded area can provide a solid-liquid-gas three-phase coexisting environment for a water body to be treated, high-efficiency oxygen supply is realized, and the gas mass transfer efficiency is also enhanced, and the technical scheme is as follows: the wetland comprises a wetland bed, wherein a central baffle is arranged in the middle of the wetland bed to divide the wetland bed into a central embedded area and a peripheral overflow area, and the filler height of the central embedded area is higher than that of the peripheral overflow area, so that the central embedded area is in a solid-liquid-gas three-phase coexistence state.

Description

Three-phase overflow efficient oxygen supplementing wetland system
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a three-phase overflow efficient oxygen supplementing wetland system.
Background
Although the land and soil width of China is vast, the land and soil width is a country with serious drought and water shortage. The per capita water resource of China is only about 30% of the average level of the world, the problem of water resource shortage obviously restricts the economic and social development of China, and the efficient treatment of sewage and the water resource recycling are the current problems which must be overcome in China. Under the rapid development environment of economy, various industrial departments of national economy are rapidly developed, and the development is undoubtedly accompanied with environmental problems such as large amount of sewage discharge and the like. In recent years, the discharge amount of sewage in China is high and tends to increase year by year, and the water environment problem is to be solved urgently. In order to solve the problem of water environment pollution, the sewage treatment technology in China is continuously perfected and developed.
At present, the sewage treatment process in China is mature, and various sewage strengthening treatment processes such as an activated sludge method, a biological filter, an oxidation pond, an artificial wetland and the like are gradually developed. The artificial wetland is an ecological sewage treatment technology with unique characteristics, and is an important measure for achieving the water quality of rivers and lakes to reach the standard and comprehensively improving the water environment quality. The constructed wetland has the advantages of stable treatment effect, low investment, convenient management, environment beautification and the like, can promote good circulation of substances and ecological environment, has outstanding technical advantages and wide application prospect in river basin pollution treatment in developing areas, and is widely applied to treatment of various types of sewage such as polluted river water, tail water of urban sewage plants, dispersed domestic sewage and the like in Shandong, Guangdong, Sichuan, Jiangsu and other provinces in nearly more than ten years. Taking Shandong province as an example, according to the statistic yearbook of Shandong province, the following results are shown: by 2016, 634.45 hectares of constructed wetland constructed in Shandong province are increased by more than 6 times compared with 100.98 hectares in 2008.
The artificial wetland is a simulation and enhancement of an environmental self-cleaning process, the removal mechanism of pollutants in water is complex, and the artificial wetland comprises various actions such as microbial degradation, plant absorption, physical adsorption and chemical precipitation, wherein the aerobic respiration of microorganisms is an important way for the wetland to remove organic pollutants (measured by Chemical Oxygen Demand (COD)) in sewage, and Total Nitrogen (TN) is mainly removed through aerobic nitrification, anoxic denitrification, anaerobic ammoxidation and the like of special functional bacteria such as nitrifying bacteria (Bedset, Hu hong Ying, 2003).
The artificial wetland has a plurality of limiting factors in the practical engineering application process. The wetland water quality purification mechanism analysis and a large amount of laboratory data show that: insufficient dissolved oxygen is an important cause of low pollutant removal rate and wetland organic matter blockage. In order to achieve the goal of efficient reoxygenation of the artificial wetland, researchers propose various wetland oxygenation technologies, such as drop-type water inflow, bottom aeration, tidal flow water inflow operation and the like. Wherein, the bottom aeration operation has obvious advantages in the aspect of oxygen supplement, but the characteristic of high energy consumption makes the operation not economical in practical engineering application. The drop-type water inflow and tidal flow water inflow operations are gradually applied to practical engineering by virtue of the advantages of low energy consumption, high-efficiency decontamination, simplicity, feasibility and the like, however, relevant researches show that no matter the drop-type water inflow or the tidal flow-type water inflow is carried out, the supplemented dissolved oxygen is completely consumed in a short time after oxygenation, and the stable and lasting dissolved oxygen concentration cannot be maintained, so that the good denitrification effect and the organic blockage prevention effect cannot be achieved. It can be seen that the current artificial wetland oxygen supplementation technology cannot meet the continuous and efficient reoxygenation requirement in large-scale economic application of the wetland.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a three-phase overflow high-efficiency oxygen supplementing wetland system, which divides a wetland bed into a central embedded area and a peripheral overflow area through the arrangement of a central baffle plate, wherein the substrate of the central embedded area is higher than that of the peripheral overflow area, the central embedded area and the peripheral overflow area are communicated at the bottom, and the liquid level is maintained at the top height of the peripheral overflow area, so that the part above the liquid level of the central embedded area can provide a solid-liquid-gas three-phase coexistence environment for a water body to be treated, high-efficiency oxygen supplementation is realized, and the gas mass transfer efficiency is also enhanced; the wetland system provided by the invention is characterized in that on the basis of the traditional wetland, matrixes with different heights are embedded to create an aerobic environment with partial solid-liquid-gas three-phase coexistence above the liquid level of the central embedded area, and the central baffle is arranged in the wetland to optimize a water flow path, so that the wetland system has the advantage of high-efficiency oxygen supplementation and can realize high-efficiency removal of COD and ammonia nitrogen.
Further, the invention adopts the following technical scheme:
the three-phase overflow high-efficiency oxygen supplementing wetland system comprises a wetland bed, wherein a central baffle is arranged in the middle of the wetland bed to separate the wetland bed into a central embedded area and a peripheral overflow area, and the filler height of the central embedded area is higher than that of the peripheral overflow area.
By arranging the embedded matrixes with different heights, the embedded type inner-high and outer-low wetland matrixes are arranged on the basis of the original wetland, the middle of the embedded type inner-high and outer-low wetland matrixes are separated by a baffle, the bottoms of the embedded type inner-high and outer-low wetland matrixes are communicated, and the communication principle is utilized to realize that the part of the wetland matrixes above the overflow weir height of the central embedded area are continuously exposed in a gas phase for efficient oxygen supplementation, so that the upper part of the central embedded area forms a solid-liquid-gas three-phase coexisting aerobic environment; the water flow path can be optimized through the arrangement of the central baffle plate, under the action of gravity, the water body sequentially flows through the central embedded area upper three-phase reaction area, the central area lower part and the peripheral overflow area above the wetland system, ammonia nitrogen is oxidized into nitrate nitrogen in the process, and partial COD is degraded. After the water body enters the peripheral overflow area, the dissolved oxygen content is less and less along with the increase of the depth of the water flow, the water body gradually enters the anaerobic area, part of COD still contained in the anaerobic area is utilized as a carbon source of denitrifying bacteria, and meanwhile, nitrate nitrogen can be reduced into nitrogen to be discharged out of the system. The water flows to the overflow height of the peripheral overflow area from bottom to top by the diversion function of the central baffle plate and flows into the water collecting tank through the overflow weir of the peripheral overflow area, so that the COD and the ammonia nitrogen can be efficiently removed.
Furthermore, a water collecting tank is arranged on the periphery of the wetland bed, the bottom of the water collecting tank is connected with a water drainage pipe, and water in a peripheral overflow area overflows into the water collecting tank.
Further, the periphery of the wetland bed is provided with a side wall, and the height of the side wall is higher than that of the water collecting tank.
Furthermore, a sawtooth-shaped overflow weir is arranged at the top end of the side wall; the zigzag overflow weir is arranged, so that a stable overflow effect can be achieved.
Further, the height of the top end of the central baffle is higher than that of the top end of the side wall.
Furthermore, the central baffle is of an annular cylinder structure, and the axis of the annular cylinder structure is vertical.
Further, the bottom of the central baffle plate is spaced from the bottom of the wetland bed by a set distance.
Furthermore, a water distribution structure is arranged above the central embedded area, water to be treated flows into the central embedded area through the water distribution structure, flows from top to bottom in the central embedded area, flows to the peripheral overflow area from bottom to top at the bottom of the wetland bed, and flows out through overflow in the peripheral overflow area.
Furthermore, the water distribution structure comprises a water inlet pipe, the water inlet pipe extends to the upper part of the central embedded area and is communicated with a plurality of radial water distribution pipes, and the water distribution pipes are provided with a plurality of water distribution holes.
Furthermore, the grain diameter of the filler in the central embedded area is 0.3-0.5cm, and the grain diameter of the filler in the peripheral overflow area is 1-3 cm.
Furthermore, the filler in the central embedded area is formed by mixing ceramsite and fly ash, and the filler in the peripheral overflow area is gravel.
Furthermore, wetland plants are arranged on the tops of the central embedded area and the peripheral overflow area. Wetland plants are arranged at the tops of the central embedded area and the peripheral overflow area, so that an auxiliary purification effect can be achieved.
Compared with the prior art, the invention has the beneficial effects that:
the wetland system of the invention realizes high-efficiency oxygen supply. Compared with the traditional artificial wetland, the central embedded area of the wetland system provides an oxygen mass transfer condition with coexistence of solid-liquid-gas three phases for the degradation of pollutants in a water body, enhances the gas mass transfer efficiency of the artificial wetland system, is beneficial to biological growth, and thus realizes better water quality purification effect.
The invention arranges the central baffle to separate the wetland bed and distributes water in the central embedded area, so that the water flow tends to the plug flow movement along the guided path as much as possible, thereby effectively avoiding the short flow of the system and improving the effective utilization volume of the whole reactor.
The aerobic environment of the central embedded area can promote microorganisms in the wetland to carry out COD and NH treatment4 +-removal of contaminants like N. In addition, the increase of the dissolved oxygen rate can effectively reduce the content of organic substances such as humus and the like which are generated by incomplete COD degradation in an anaerobic environment, and further reduce the organic blocking risk of the wetland. The overflow weir design of peripheral region has replaced the drain pipe, can effectively reduce the drain pipe mouth of pipe and block up the risk.
In the wetland system, a certain filler resistance gradient is designed, so that the filler resistance of the central embedded area is greater than that of the peripheral overflow area, and the removal effect of the wetland on pollutants is improved.
The wetland plants planted on the surface of the wetland bed can play a role in auxiliary purification, and bring ornamental value to the whole wetland system from the aesthetic point of view.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic view of a wetland system of the present invention;
fig. 2 is a top view of the wetland system of the invention;
in the figure, 1: water distribution structure, 2: center baffle, 3: central inset, 4: peripheral overflow area, 5: catch basin, 6: drain pipe, 7: aerobic zone, 8: an anaerobic zone.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background technology, the traditional and partially improved artificial wetlands have the problems of poor reoxygenation effect, high energy consumption, low removal rate of COD and nitrogen and phosphorus, easy occurrence of short flow phenomenon, organic pollution blockage and the like, and in order to solve the technical problems, the application provides a three-phase overflow high-efficiency oxygen supplementing wetland system which is a novel high-efficiency oxygen supplementing artificial wetland system based on oxygen regulation, embedded high-inner and low-outer wetland matrixes are arranged on the basis of an original wetland, the middle part is separated by a baffle plate, the bottom part is communicated, the principle of a communicating vessel is utilized to realize that the partial wetland matrixes above the liquid level are continuously exposed in a gas phase for high-efficiency oxygen supplementation, so that the pollutants are efficiently removed in the process of flowing through the matrixes by water, and the problem of matrix blockage caused by incomplete degradation of the pollutants under the long-term anaerobic condition is prevented; through the aerobic alternate environment of the upper substrate and the anaerobic alternate environment of the bottom substrate, the method is beneficial to removing nitrogen pollutants such as ammonia nitrogen, nitrate nitrogen and the like in water and effectively avoids the short flow phenomenon in a wetland system.
In a typical embodiment of the present application, as shown in fig. 1-2, a three-phase overflow high-efficiency oxygen supplementing wetland system is provided, which comprises a wetland bed, wherein a central baffle 2 is arranged in the middle of the wetland bed to divide the wetland bed into a central embedded area 3 and a peripheral overflow area 4, and the filler height of the central embedded area 3 is higher than that of the peripheral overflow area 4, so that the central embedded area 3 is in a solid-liquid-gas three-phase coexisting state.
According to the invention, the embedded substrates with different heights are arranged, so that a solid-liquid-gas three-phase coexisting aerobic environment is formed in the central embedded area, the water flow path can be optimized by arranging the central baffle, the advantage of high-efficiency oxygen supplementation is achieved, and the high-efficiency removal of COD and ammonia nitrogen can be realized.
The periphery of the wetland bed is provided with a water collecting tank 5, the bottom of the water collecting tank 5 is connected with a water discharge pipe 6, and the water body of the peripheral overflow area 4 overflows into the water collecting tank 5.
The periphery of the wetland bed is provided with a side wall, and the height of the side wall is higher than that of the water collecting tank 5.
The top end of the peripheral side wall of the wetland bed is provided with a sawtooth-shaped overflow weir; a smooth overflow effect can be achieved.
The height of the top end of the central baffle 2 is higher than that of the top end of the side wall. The central baffle 2 is of an annular cylinder structure, and the axis of the annular cylinder structure is vertical. The bottom of the central baffle plate 2 is provided with a set distance with the bottom of the wetland bed. In the invention, a straight cylindrical central baffle 2 is positioned above the whole wetland system, the wetland bed is divided into a central embedded area 3 positioned above the wetland system and a peripheral overflow area 4 positioned below the wetland system by the central baffle 2, the internal area surrounded by the central baffle 2 is the central embedded area 3, and the rest is the peripheral overflow area 4.
The water distribution structure 1 is arranged above the central embedded area 3, water to be treated flows into the central embedded area 3 through the water distribution structure 1, flows from top to bottom in the central embedded area 3, flows to the peripheral overflow area 4 from bottom to top at the bottom of the wetland bed, and flows out through overflow of the water in the peripheral overflow area 4.
The water distribution structure 1 comprises a water inlet pipe, the water inlet pipe extends to the upper part of the central embedded area 3 and is communicated with a plurality of radial water distribution pipes, and the water distribution pipes are provided with a plurality of water distribution holes.
The wetland system of the invention is designed in a mode of continuous water inlet and continuous water outlet. The radial water distribution structure 1 continuously distributes water above the central embedded area 3 of the wetland bed, and water slowly percolates from top to bottom in the central embedded area 3. Because of the height gradient between the central embedded area 3 and the peripheral overflow area 4 and the design of the overflow weir of the lower peripheral overflow area 4, under the action of gravity, water does not stay when flowing through the central embedded area 3 above the wetland system, and flows into the peripheral overflow area 4 below the wetland system from top to bottom under the flow guiding action of the central baffle 2, ammonia nitrogen is nitrified into nitrate nitrogen in the process, and partial COD is degraded. After the water body enters the peripheral overflow area 4, the dissolved oxygen content is less and less along with the increase of the water flow depth, the water body gradually enters the anaerobic area 8, part of COD still contained in the anaerobic area 8 is utilized as a carbon source of denitrifying bacteria, and meanwhile, nitrate nitrogen can be reduced into nitrogen to be discharged out of the system. The water body flows to the height of the overflow weir from bottom to top under the flow guiding action of the central baffle 2 and flows into the water collecting tank 5 through the overflow weir of the peripheral overflow area 4.
In the sewage purification process, the water body to be treated flows through the central embedded area 3 and the peripheral embedded area 4 in sequence and flows to the water collecting tank 5. The heights of the inner and outer substrates are different, and the liquid level is kept at the height of the top end of the peripheral substrate in the wetland operation process due to the communicating vessel principle. The medium below the liquid level is immersed in the liquid phase for a long time, and the part of the intermediate medium above the liquid level is always in the gas phase. The central embedded area 3 can provide a solid-liquid-gas three-phase coexistence environment for the water body to be treated, and an aerobic area 7 with a high-efficiency oxygen supplementing effect is formed. When the water body to be treated flows through the central embedded area 3, pollutants such as ammonia nitrogen and the like carried by the water body to be treated are adsorbed in the biological membrane attached to the surface of the matrix, the sewage is positioned in the solid-liquid-gas three-phase reactor, oxygen in a gas phase can enter the biological membrane through a thin liquid membrane on the surface of the biological membrane, the mass transfer rate is improved, the ammonia nitrogen in the water body can be subjected to full nitration reaction, the ammonia nitrogen is oxidized into nitrate nitrogen, and partial COD is degraded. After the water body enters the peripheral overflow area 4, the dissolved oxygen content is less and less along with the increase of the water flow depth, the water body gradually enters the anaerobic area 8, part of COD still contained in the anaerobic area 8 is utilized as a carbon source of denitrifying bacteria, and meanwhile, nitrate nitrogen can be reduced into nitrogen to be discharged out of the system. The water further purified in the peripheral overflow wetland 4 flows out of the wetland system through an overflow weir and flows to a water collecting tank 5.
In order to further optimize the sewage treatment effect of the three-phase overflow high-efficiency oxygen supplementing wetland system and ensure that the reaction of pollutants in the aerobic and anaerobic stages is as full as possible, the invention makes the following design on the aspect of mass transfer performance of matrix filler: the central embedded area 3 is a filler with larger mass transfer resistance, so that water can slowly flow through the aerobic area 7 to provide better mass transfer effect; and the other areas are provided with fillers with lower resistance to promote the flow of the water body plug flow and reduce the risk of blockage of the anaerobic area. The filler of the central embedded area 3 is formed by mixing ceramsite with the grain diameter of 0.3-0.5cm and fly ash; the filler of the peripheral overflow area 4 consists of gravel with the particle size of 1-3cm and other fillers with larger particle sizes.
Wetland plants are arranged at the tops of the central embedded area 3 and the peripheral overflow area 4. Wetland plants are arranged at the tops of the central embedded area and the peripheral overflow area, so that an auxiliary purification effect can be achieved.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
And constructing an efficient oxygen supplementation artificial wetland small test device based on oxygen regulation in a laboratory. Two control groups were set: 1) the traditional artificial wetland small test cylindrical barrel with water inlet at the upper end and water outlet at the bottom end; 2) the bottom of a traditional constructed wetland small test cylindrical barrel with water inlet at the upper end and water outlet at the bottom is additionally provided with an aeration head. Preliminarily setting the height of the aerobic zone 7/the height of the anaerobic zone 8 to be 1, setting the surface area of the central embedded zone 3 to be smaller than the peripheral area, taking secondary effluent of a sewage plant as inlet water of the wetland lab scale system, and measuring COD, BOD, TN and NH in the inlet water and the outlet water at regular time4 +N, TP, and the like, and the purification effect of the wetland on the sewage quality is examined. Compared with the traditional wetland and the aeration optimization operation wetland under the same water inlet and operation conditions (water inlet flow, water quality, hydraulic retention time and the like), the system can carry out COD, TN and other pollutantsRemoval effect and rate of plug formation. The inlet water flow of the small test system is designed to be 4_ L/d, the Hydraulic Retention Time (HRT) is designed to be 6_ h, the inlet water COD is 75.0_ mg/L, and NH is added4 +-N-32.5 _ mg/L, TP-4.0 _ mg/L. Wherein the aeration flow rate of the aeration group is 1_ L/min.
The experimental results show that the removal efficiency of COD and TP in the experimental group is equivalent to that of the blank group and the aeration group, and the removal efficiency of ammonia nitrogen in the experimental group is obviously improved relative to that of the control group; the removal effect of the small test device proves the high-efficiency oxygen supplementing effect of the three-phase overflow high-efficiency oxygen supplementing wetland system.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. The three-phase overflow efficient oxygen supplementing wetland system is characterized by comprising a wetland bed, wherein a central baffle is arranged in the middle of the wetland bed to divide the wetland bed into a central embedded area and a peripheral overflow area, the central baffle is of an annular cylinder structure, and the axis of the annular cylinder structure is vertical;
a water distribution structure is arranged above the central embedded area, water to be treated flows into the central embedded area through the water distribution structure, flows from top to bottom in the central embedded area, further flows to a peripheral overflow area from bottom to top at the bottom of the wetland bed, and water in the peripheral overflow area flows out through overflow;
the height of the top end of the central baffle is higher than that of the top end of the side wall, a set distance is reserved between the bottom of the central baffle and the bottom of the wetland bed, and the height of the filler in the central embedded area is higher than that of the filler in the peripheral overflow area, so that the central embedded area is in a solid-liquid-gas three-phase coexistence state.
2. The wetland system of claim 1, wherein a water collecting tank is arranged on the periphery of the wetland bed, the bottom of the water collecting tank is connected with a water drainage pipe, and the water body in the peripheral overflow area overflows into the water collecting tank.
3. The wetland system of claim 2, wherein the periphery of the wetland bed is provided with a side wall, and the height of the side wall is higher than that of the water collecting tank; and the top end of the side wall is provided with a sawtooth-shaped overflow weir.
4. The wetland system of claim 1, wherein the water distribution structure comprises a water inlet pipe, the water inlet pipe extends above the central embedded area and is communicated with a plurality of radial water distribution pipes, and the water distribution pipes are provided with a plurality of water distribution holes.
5. The wetland system of claim 1, wherein the filler particle size in the central embedded area is 0.3-0.5cm, and the filler particle size in the peripheral overflow area is 1-3 cm.
6. The wetland system of claim 1, wherein wetland plants are arranged on the tops of the central embedded area and the peripheral overflow area.
CN201810200487.6A 2018-03-12 2018-03-12 Three-phase overflow efficient oxygen supplementing wetland system Active CN108341495B (en)

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CN109205966A (en) * 2018-11-20 2019-01-15 景德镇陶瓷大学 A kind of integrated A based on linker mode/O membrane bioreactor and sewage water treatment method
CN113087300A (en) * 2021-04-07 2021-07-09 苏州科技大学 High-efficiency nitrogen and phosphorus removal composite artificial wetland system

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CN2717942Y (en) * 2004-06-02 2005-08-17 华南农业大学 Life sewage vertical flowing-horizontal flowing composite artificial wet land treatment bed
CN201501819U (en) * 2009-08-24 2010-06-09 重庆大学 Sewage treatment system utilizing drainage ditch
CN101792228A (en) * 2009-12-30 2010-08-04 中国科学院生态环境研究中心 Double-layer artificial wetland system for strengthening sewage denitrification and dephosphorization and operation method thereof
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