An AO type anti-clogging multi-stage composite artificial wetland system

Abstract

The present invention provides an AO-type anti-clogging multi-stage composite artificial wetland system, comprising a sewage treatment unit, wherein the sewage treatment unit is divided into an anaerobic zone and an aerobic zone by a baffle, and the sewage to be treated first enters the anaerobic zone of the sewage treatment unit for treatment, and then enters the aerobic zone for further treatment; the sewage treatment unit has at least one, a baffle is installed in the anaerobic zone, and the anaerobic zone is divided into at least two blocks along the length direction, and at least two anaerobic drainage outlets are provided on the baffle between the at least two blocks and the aerobic zone, and the at least two anaerobic drainage outlets are arranged at different heights on the baffle; the at least two anaerobic drainage outlets are respectively connected to anaerobic drainage pipes, and the water entering the anaerobic drainage outlets is discharged upward, downward, or at the same height as the anaerobic drainage outlets into the aerobic zone; the AO-type anti-clogging multi-stage composite artificial wetland system provided by the present invention improves the denitrification efficiency and improves the effluent quality of the artificial wetland system.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to an AO type anti-clogging multi-stage composite artificial wetland system. Background Art

[0002] Constructed wetlands purify wastewater by integrating biological, physical, and chemical processes. They achieve efficient wastewater purification through matrix filtration, adsorption, precipitation, ion exchange, complexation, microbial absorption, decomposition, and circulation, as well as nitrogen nitrification and denitrification, and plant uptake of nutrients. A constructed wetland system is a complete system comprised of four basic elements: a matrix, plants, microorganisms, and water. These components work synergistically to achieve the wetland's purification capacity. Based on wastewater flow patterns and plant growth types, the subsurface flow constructed wetland (SFW) system is currently the most effective constructed wetland system.

[0003] However, the artificial wetland systems in the prior art generally have the problem of low denitrification efficiency. This is because, in existing artificial wetland systems, nitrogen removal is mainly achieved by the combined action of nitrification, ammonification and denitrifying bacteria. The roots of the emergent plants in the wetland system bear the main task of supplying oxygen to the wetland. They will form anoxic, aerobic and anaerobic conditions, thereby providing a growth environment for various anaerobic, aerobic, or facultative microorganisms, and nitrification, ammonification and denitrification can proceed simultaneously, thereby achieving nitrogen removal. However, the smooth progress of nitrification requires sufficient dissolved oxygen. At the same time, the decline in nitrification will further reduce the ability of denitrification, and the dissolved oxygen concentration that emergent plants can supply for nitrification is not high. In addition, the lack of organic carbon sources in artificial wetland systems also inhibits denitrification and is an important factor in the decline of its denitrification efficiency. If the wetland is blocked, it will also cause the anaerobic environment to worsen, which will have an inhibitory effect on nitrifying bacteria, and the problem of low denitrification efficiency will become more serious. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an AO type anti-clogging multi-stage composite artificial wetland system to improve the denitrification efficiency and improve the water quality of the artificial wetland system.

[0005] To achieve the above objectives, the AO type anti-clogging multi-stage composite artificial wetland system provided by the present invention adopts the following technical solutions:

[0006] An AO-type anti-clogging multi-stage composite constructed wetland system includes a sewage treatment unit, which is divided into an anaerobic zone and an aerobic zone by a baffle. The sewage to be treated first enters the anaerobic zone of the sewage treatment unit for treatment and then enters the aerobic zone for further treatment. The sewage treatment unit has at least one baffle installed in the anaerobic zone, which divides the anaerobic zone into at least two blocks along the length direction. At least two anaerobic drainage outlets are provided on the baffle between the at least two blocks and the aerobic zone. The at least two anaerobic drainage outlets are arranged at different heights on the baffle. The at least two anaerobic drainage outlets are respectively connected to anaerobic drainage pipes, which discharge water entering the anaerobic drainage outlets upward, downward, or at the same height as the anaerobic drainage outlets into the aerobic zone.

[0007] The sewage is treated in a sewage treatment unit, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after the water quality meets the standard; if the water quality does not meet the standard after being treated in a sewage treatment unit, it enters the next sewage treatment unit for further treatment, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after meeting the standard.

[0008] Optionally, a drainage collection pipe is provided on the other baffle plate of the aerobic zone, the water inlet of the drainage collection pipe is connected to a water quality detector, and the water outlet is connected to a drainage channel; the water quality monitor detects whether the water quality in the drainage collection pipe meets the standards, and if so, notifies the electronic valve on the drainage collection pipe to open the channel with the drainage collection pipe to discharge the water that meets the standards.

[0009] Optionally, the drainage collection pipe is fixed on the baffle along the length direction of the aerobic zone, at a distance of 1 / 6 to 1 / 2 from the top of the baffle.

[0010] Optionally, a large-pore grille and a small-pore grille are sequentially provided at the water inlet of the drainage collection pipe.

[0011] Optionally, at least two drainage holes are provided on the baffle between the aerobic zone and the anaerobic zone of the next sewage treatment unit, the at least two drainage holes are connected to the drainage collection pipe through a pipe, and the at least two drainage holes are arranged at different heights on the baffle.

[0012] Optionally, the at least two drainage holes are provided with automatic switches.

[0013] Optionally, the at least two blocks are three blocks, and there are three at least two anaerobic drain outlets, which are distributed on the baffle in the upper, middle and lower positions; the anaerobic drainage pipe connected to the upper anaerobic drain outlet discharges the water entering the upper anaerobic drain outlet downward into the aerobic zone; the anaerobic drainage pipe connected to the middle anaerobic drain outlet discharges the water entering the middle anaerobic drain outlet into the aerobic zone at the same height; the anaerobic drainage pipe connected to the lower anaerobic drain outlet discharges the water entering the lower anaerobic drain outlet upward into the aerobic zone.

[0014] Optionally, the at least two anaerobic drain outlets are provided with automatic switches.

[0015] Optionally, the volume ratio of the substrate to the plant carbon source material in the anaerobic zone is 100:1-3.

[0016] Optionally, emergent plants are planted above the baffle between the anaerobic zone and the aerobic zone, and the emergent plants are fixed above the baffle by a fixing frame; the anaerobic zone is filled with a matrix and a plant carbon source material, and the aerobic zone is planted with submerged plants and floating plants; the emergent plants are: one or a mixture of two or more of windmill grass, reed bamboo and water plantain.

[0017] The AO type anti-clogging multi-stage composite artificial wetland system provided by the present invention adopts a multi-unit alternating method to treat sewage, which can control the quality of the treated water and flexibly respond to the needs of different sewage; the sewage first enters the anaerobic zone for treatment, avoiding the impact of high-concentration sewage on submerged plants in the aerobic zone and reducing the purification capacity of the submerged plants; after purification in the anaerobic zone, the oxygen in the aerobic zone improves the purification capacity of floating plants and submerged plants.

[0018] Moreover, the artificial wetland of the present invention is treated in different zones, and plant carbon source materials are pre-buried in the anaerobic zone, which improves the ability to treat low carbon-nitrogen ratio sewage compared to the existing technology. Floating and submerged plants in the aerobic zone have a better three-dimensional purification effect.

[0019] Furthermore, the present invention plants emergent plants above the baffle between the anaerobic zone and the aerobic zone, and a portion of the root system of the emergent plants is interspersed in the matrix of the anaerobic zone to avoid clogging of the matrix; a portion of the root system of the emergent plants is in the aerobic zone to avoid the emergent plants being completely planted in the anaerobic zone and dying due to lack of oxygen; the root-zone partitioning planting of the emergent plants can improve the tolerance and purification effect of the plants.

[0020] Furthermore, the anaerobic area is divided into blocks, and the drainage pipe outlets of different blocks are at different heights from the aerobic area. The drainage time of the drainage and irrigation outlets is controlled to accelerate the anaerobic and aerobic reaction rates of sewage and reduce sewage treatment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a top view of the AO type anti-clogging multi-stage composite artificial wetland system provided by the present invention;

[0022] Figure 2 This is a side sectional view of the AO type anti-clogging multi-stage composite artificial wetland system provided by the present invention;

[0023] Figure 3 This is a front view of the drainage pipe opening on the PE baffle between the anaerobic zone and the aerobic zone provided by the present invention;

[0024] Figure 4 This is a side view of the drainage pipe opening on the PE baffle between the anaerobic zone and the aerobic zone provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the PE baffle, drainage collection pipe, and drainage hole within the aerobic zone and between the anaerobic zone of the next sewage treatment unit provided by the present invention;

[0026] Figure 6 It is an installation structure diagram of the fixing bracket 3-4 provided by the present invention. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 、 2 , 3, 4, 5 and 6 clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0028] Example 1

[0029] An AO type anti-clogging multi-stage composite artificial wetland system includes a sewage treatment unit, which is divided into an anaerobic zone 1 and an aerobic zone 2 by a baffle. The sewage to be treated first enters the anaerobic zone 1 of the sewage treatment unit for treatment, and then enters the aerobic zone 2 for further treatment; there is at least one sewage treatment unit, and a baffle 3 is installed in the anaerobic zone 1 to separate the anaerobic zone 1 into at least two blocks along the length direction. At least two anaerobic drainage outlets are provided on the baffle between the at least two blocks and the aerobic zone 2, and the at least two anaerobic drainage outlets are arranged high and low on the baffle, that is, at least two anaerobic drainage outlets are arranged high and low on the baffle. The heights of the water outlets on the baffle are different, some are high and some are low; at least two anaerobic drain outlets are respectively connected to anaerobic drainage pipes to discharge the water entering the anaerobic drain outlet upward, downward, or into the aerobic zone at the same height as the anaerobic drain outlet; for example, if the anaerobic drain outlet is low, the anaerobic drainage pipe discharges the water from the anaerobic drain outlet upward into the aerobic zone; if the anaerobic drain outlet is high, the anaerobic drainage pipe discharges the water from the anaerobic drain outlet downward into the aerobic zone, so that water with a relatively high oxygen content at the upper part of the anaerobic zone enters the lower part of the aerobic zone, and water with a relatively low oxygen content at the lower part of the anaerobic zone enters the upper part of the aerobic zone.

[0030] The sewage is treated in a sewage treatment unit, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after the water quality meets the standard; if the water quality does not meet the standard after being treated in a sewage treatment unit, it enters the next sewage treatment unit for further treatment, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after meeting the standard.

[0031] The baffle of the present invention uses a PE baffle, and any waterproof and water-proof baffle can be used.

[0032] Each sewage treatment unit is an open-top container that can hold a certain amount of sewage for a period of time to facilitate treatment. The present invention designs the anaerobic zone to have a width of 0.4-0.6m, a length of 0.8-1.2m, and a depth of 0.8-1.2m; the aerobic zone to have a width of 0.8-1.2m, a length of 1.2-1.8m, and a depth of 0.8-1.2m. Those skilled in the art can design the sizes of the sewage treatment units, anaerobic zones, and aerobic zones based on the sizes of the anaerobic and aerobic zones provided by the present invention, as well as the degree and amount of sewage contamination, and the present invention does not impose any restrictions on this.

[0033] The sewage to be treated enters the first sewage treatment unit and first enters the anaerobic zone 1 through the sewage inlet 1-4. The anaerobic zone is filled with a matrix and a plant carbon source material. The matrix is ​​a mixture of one or more of ceramsite, volcanic rock, medical stone, etc. Among them, the volcanic rock has a specification of φ4-8mm, the zeolite has a specification of φ2-6mm, and the ceramsite has a specification of φ3-6mm. The anaerobic zone 1 is pre-buried with a plant carbon source material, and the volume ratio of the plant carbon source material to the matrix in the anaerobic zone is: 1-3:100. The plant carbon source material is one or more of sycamore leaves, corn cobs, and reed straw. The preparation method is to put the cleaned plant carbon source into an oven at 40-50℃, dry it for 12-24 hours, then take it out and crush it into 1-3mm.

[0034] Submerged plants and floating plants are planted in the aerobic zone 2. The submerged plants are one or a mixture of two or more of Vallisneria, Black algae and Foxtail grass; the floating plants are one or a mixture of two or more of Eichhornia crassipes, Hibiscus mutabilis and Cyperus rotundus. Emergent plants are planted above the baffle 3 between the anaerobic zone 1 and the aerobic zone 2. To prevent the emergent plants from falling, the emergent plants are fixed on the PE baffle 3 using fixing frames 3-4. The fixing frames 3-4 are U-shaped building materials mainly made of stainless steel, aluminum alloy, polyethylene and other materials. They can be directly overlapped or welded to the PE board, and mainly play the role of assisting the upright growth of plants. The root system of emergent plants is relatively long, and the root system can penetrate deep into the matrix of the anaerobic zone 2 to avoid matrix blockage; because the emergent plants are planted on the PE baffle, part of the root system can penetrate deep into the aerobic zone, and the nutrients in the aerobic zone can nourish the growth of emergent plants. Emergent plants are: one or a mixture of two or more of Pinus schrenkiana, Phragmites australis and Onion.

[0035] Aerobic zone 2 is connected to an air pump, which is opened once every 2 hours for 10 minutes at a time. There is no need to let air in for a long time.

[0036] Example 2

[0037] This embodiment adds a water quality test based on the first embodiment to detect whether the sewage treated by the sewage treatment unit meets the standards, as follows:

[0038] like Figure 1 and Figure 2 As shown, a drainage collection pipe 3-5 is installed on the other side of the baffle 3 of the aerobic zone 2. The water inlet of the drainage collection pipe 3-5 is connected to a water quality detector 3-6, and the water outlet is connected to a drainage channel 3-7. The water quality detector 3-6 detects whether the water in the drainage collection pipe 3-5 meets the quality standards. If it does, it notifies the electronic valve in the drainage channel to open the channel with the drainage collection pipe 3-5, thereby discharging the qualified water. If it does not meet the standards, the water will enter the next sewage treatment unit for treatment.

[0039] The electronic valve of the present invention is a solenoid valve. When there is only one sewage treatment unit in an AO-type anti-clogging multi-stage composite constructed wetland system, the other baffle 3 of the aerobic zone 2 can be any of the other three baffles, except the one between the anaerobic zone and the aerobic zone. When there are more than two sewage treatment units in the AO-type anti-clogging multi-stage composite constructed wetland system, the other baffle 3 of the aerobic zone 2 is the baffle between the aerobic zone and the anaerobic zone of the next sewage treatment unit.

[0040] The drainage collection pipe 3 - 5 is fixed on the baffle 3 along the length direction of the aerobic zone 2 , at a distance of 1 / 6 to 1 / 2 from the top of the baffle 3 .

[0041] Water quality detected by water quality detector 3-6 can be discharged if it meets the Level B standard in the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants". The main indicators of the B standard are: chemical oxygen demand (COD) ≤ 60mg / L; suspended solids (SS) ≤ 20mg / L; total nitrogen ≤ 20mg / L; ammonia nitrogen ≤ 8mg / L; total phosphorus ≤ 1mg / L.

[0042] According to the height of the aerobic zone designed by the present invention, the drainage collection pipe 3-5 is set at a distance of 0.2-0.4m from the top of the aerobic zone; in order to prevent debris from entering the drainage collection pipe, such as Figure 2 As shown, a large-pore grille 3-5-2 and a small-pore grille 3-5-3 are sequentially arranged at the water inlet of the drainage collection pipe 3-5.

[0043] Example 3

[0044] Example 3 Based on Example 1 or Example 2, when the first sewage treatment unit fails to meet the treatment standards, when there are more than two sewage treatment units, the following are set:

[0045] At least two drainage holes are provided on the baffle between aerobic zone 2 and the anaerobic zone 1 of the next sewage treatment unit. These holes are connected to the drainage collection pipe 3-5 via a pipe. The two drainage holes are arranged at different heights on the baffle. For example, if there are two drainage holes, one is high and the other is low. If the water quality detector 3-6 detects that the sewage treated by the first sewage treatment unit does not meet the standards, the sewage passes through the drainage collection pipe 3-4, enters the pipeline, and then enters the next sewage treatment unit through the at least two drainage holes.

[0046] At least two drain holes are provided with automatic switches, which may be electromagnetic valves, and one can be set to be on and the other closed as needed.

[0047] The next sewage treatment unit, with the exception of the sewage inlet, has the same configuration as the first sewage treatment unit, including the anaerobic zone, aerobic zone, drain outlet, and drainage piping. For the final sewage treatment unit, the drainage collection pipe can be installed on the remaining three baffles in the aerobic zone, excluding the one adjacent to the anaerobic zone. Drain holes are no longer provided on the remaining three baffles in the aerobic zone, excluding the one adjacent to the anaerobic zone. The remaining configuration of the final sewage treatment unit is the same as the next sewage treatment unit.

[0048] In an AO type anti-clogging multi-stage composite artificial wetland system, the number of sewage treatment units is determined according to the degree of sewage pollution. If the sewage pollution is serious, more sewage treatment units are set up, and if the sewage pollution is light, fewer sewage treatment units can be set up.

[0049] Example 4

[0050] Example 4 Based on Example 1, or based on Example 2, or based on Example 3, at least two blocks of the anaerobic zone are specifically divided into three, which involves changing the number of anaerobic drainage outlets, anaerobic drainage pipes, etc., as follows:

[0051] like Figure 1 As shown, at least two blocks are three blocks, namely 1-1, 1-2 and 1-3, and each block is filled with the same substrate and plant carbon source material. Each anaerobic block is connected to the sewage inlet pipe 1-4, and the sewage inlet pipe 1-4 is buried at the bottom of the anaerobic block. At least two anaerobic drainage outlets have three, such as Figure 3 As shown, they are 2-1, 2-2 and 2-3, and the three anaerobic drain outlets are distributed in the upper, middle and lower positions on the baffle; the anaerobic drainage pipe 2-1-1 connected to the upper anaerobic drain outlet 2-1 discharges the water entering the upper anaerobic drain outlet 2-1 downward into the aerobic zone 2; the anaerobic drainage pipe 2-2-2 connected to the middle anaerobic drain outlet 2-2 discharges the water entering the middle anaerobic drain outlet 2-2 into the aerobic zone 2 at the same height; the anaerobic drainage pipe 2-3-3 connected to the lower anaerobic drain outlet 2-3 discharges the water entering the lower anaerobic drain outlet 2-3 upward into the aerobic zone 2.

[0052] Each of the three anaerobic drainage outlets is equipped with an automatic switch, such as a solenoid valve, to achieve different drainage times for the anaerobic blocks. During sewage treatment, the system of the present invention allows for a 6-8 hour difference in the time it takes for sewage to enter anaerobic blocks 1-1, 1-2, and 1-3. For example, the upper outlet opens at 1:00 AM, the other two outlets close; the middle outlet opens at 7:00 AM, the other two outlets close; the lower outlet opens at 1:00 PM, the other two outlets close; the upper outlet opens at 7:00 PM, the other two outlets close; and the sewage remains in each anaerobic block for 16-20 hours.

[0053] like Figure 4 As shown, the sewage treated in the anaerobic zone 1-1 enters the anaerobic drainage pipe 2-1-1 through the upper anaerobic drainage port 2-1 and flows along the pipe to the bottom of the aerobic zone 2; after 6-8 hours, the water in the anaerobic zone 1-2 flows into the anaerobic drainage pipe 2-2-2 through the middle anaerobic drainage port 2-2 and flows into the middle of the aerobic zone 2; after another 6-8 hours, the water in the anaerobic zone 1-3 enters the anaerobic drainage pipe 2-3-3 through the lower anaerobic drainage port 2-3. The water pressure in the anaerobic zone 1-3 causes the water to flow upward along the pipe to the upper part of the aerobic zone 2.

[0054] This structural design maximizes the contact area between the upper sewage and air in the anaerobic zone, resulting in higher oxygen levels and greater aerobic microbial activity. Drain outlet 2-1 of 1-1 is located at the top, directing the highly oxygenated sewage from above to the bottom of the aerobic zone via a pipe. Sewage from 1-2, with moderate oxygen levels, is discharged directly into the middle of the aerobic zone via 2-2, while bottom sewage from 1-3, with lower oxygen levels, is discharged into the upper aerobic zone via 2-3, significantly improving aerobic efficiency. By artificially stratifying sewage from different water layers into the upper, middle, and lower levels, each inflow and outflow of sewage from the anaerobic tank to the aerobic tank maximizes the activity of different microorganisms with minimal energy consumption. By timing the opening and closing of the anaerobic sewage outlet, the treatment time and efficacy of different microorganisms are effectively increased, enhancing decontamination performance.

[0055] The undischarged water from anaerobic zones 1-1 and 2-1 will be mixed with the next incoming sewage and continue to be treated. Periodic cleaning of sediment or impurities in the anaerobic and aerobic zones of the sewage treatment unit is required.

[0056] Accordingly, this embodiment is based on the third embodiment, as shown in FIG. Figure 5 As shown, there are three corresponding drainage holes, namely 3-1, 3-2, and 3-3, arranged in the upper, middle, and lower positions on the baffle. The arrangement of the drainage outlets, drainage holes, and drainage collection pipes of the anaerobic and aerobic zones of the next and last sewage treatment units is the same as that of the third and fourth embodiments.

[0057] In the present invention, unless otherwise clearly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified and limited, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0058] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An AO type anti-clogging multi-stage composite constructed wetland system, comprising a sewage treatment unit, wherein the sewage treatment unit is divided into an anaerobic zone and an aerobic zone by a baffle, and the sewage to be treated first enters the anaerobic zone of the sewage treatment unit for treatment, and then enters the aerobic zone for further treatment; characterized in that: The sewage treatment unit comprises at least one, wherein a baffle is installed in the anaerobic zone, dividing the anaerobic zone into at least two blocks along the length direction, and at least two anaerobic drainage outlets are provided on the baffle between the at least two blocks and the aerobic zone, and the at least two anaerobic drainage outlets are arranged at different heights on the baffle; the at least two anaerobic drainage outlets are respectively connected to anaerobic drainage pipes, and water entering the anaerobic drainage outlets is discharged upward, downward, or at the same height as the anaerobic drainage outlets into the aerobic zone; The at least two blocks are three blocks, and the at least two anaerobic drain outlets are three, and the three anaerobic drain outlets are distributed on the baffle in the upper, middle and lower positions; the anaerobic drain pipe connected to the upper anaerobic drain outlet discharges the water entering the upper anaerobic drain outlet downwardly into the aerobic zone; the anaerobic drain pipe connected to the middle anaerobic drain outlet discharges the water entering the middle anaerobic drain outlet into the aerobic zone at the same height; the anaerobic drain pipe connected to the lower anaerobic drain outlet discharges the water entering the lower anaerobic drain outlet upwardly into the aerobic zone; At least two drainage holes are provided on the baffle between the aerobic zone and the anaerobic zone of the next sewage treatment unit. The at least two drainage holes are connected to the drainage collection pipe through a pipe. The at least two drainage holes are arranged at different heights on the baffle; and automatic switches are provided on the at least two drainage holes. Emergent plants are planted above the baffle between the anaerobic zone and the aerobic zone, and the emergent plants are fixed above the baffle via a fixing frame; the anaerobic zone is filled with a substrate and a plant carbon source material, and the aerobic zone is planted with submerged plants and floating plants; the emergent plants are one or a mixture of two or more of: windmill grass, reed bamboo, and water plantain; the volume ratio of the substrate to the plant carbon source material in the anaerobic zone is 100:1-3; The sewage is treated in a sewage treatment unit, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after the water quality meets the standard; if the water quality does not meet the standard after being treated in a sewage treatment unit, it enters the next sewage treatment unit for further treatment, and is discharged from the AO type anti-clogging multi-stage composite artificial wetland system after meeting the standard.

2. The AO type anti-clogging multi-stage composite artificial wetland system according to claim 1 is characterized in that: A drainage collection pipe is provided on the other baffle plate of the aerobic zone. The water inlet of the drainage collection pipe is connected to a water quality detector, and the water outlet is connected to a drainage channel. The water quality monitor detects whether the water quality in the drainage collection pipe meets the standards. If so, the electronic valve on the drainage collection pipe is notified to open the channel with the drainage collection pipe to discharge the water that meets the standards.

3. The AO type anti-clogging multi-stage composite artificial wetland system according to claim 2, characterized in that: The drainage collection pipe is fixed on the baffle along the length direction of the aerobic zone, at a distance of 1 / 6 to 1 / 2 from the top of the baffle.

4. The AO type anti-clogging multi-stage composite artificial wetland system according to claim 3 is characterized in that: A large-pore grille and a small-pore grille are sequentially arranged at the water inlet of the drainage collection pipe.

5. The AO type anti-clogging multi-stage composite artificial wetland system according to claim 1 is characterized in that: The at least two anaerobic drainage outlets are provided with automatic switches.

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