CN112897801A

CN112897801A - Efficient composite flow constructed wetland system and implementation method thereof

Info

Publication number: CN112897801A
Application number: CN202110033540.XA
Authority: CN
Inventors: 秦红科; 张卫; 王晨义; 赵旭宏; 王福来; 熊爱清
Original assignee: Lingnan Water Group Co ltd
Current assignee: Lingnan Water Group Co ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-06-04

Abstract

The invention discloses a high-efficiency composite flow constructed wetland system, which comprises a grid regulating tank, a full-automatic backwashing filter, a high-efficiency composite flow constructed wetland, a pipeline A and a pipeline B, wherein the grid regulating tank is connected with the full-automatic backwashing filter through the pipeline A, and the full-automatic backwashing filter is connected with the high-efficiency composite flow constructed wetland through the pipeline B; meanwhile, an implementation method of the high-efficiency composite flow constructed wetland system is also disclosed. The invention periodically discharges the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process out of the wetland unit, thereby ensuring the smooth water flow in the wetland.

Description

Efficient composite flow constructed wetland system and implementation method thereof

Technical Field

The invention relates to an efficient composite flow constructed wetland system and an implementation method thereof, belonging to the technical field of sewage treatment.

Background

In the artificial wetland sewage treatment system, the removal of organic matters and nitrogen by the artificial wetland is mainly carried out under the synergistic action of physics, chemistry and biology, wherein the substrate adsorption and the nitrification/denitrification of microorganisms are mainly relied on, but the nitrification of the microorganisms needs sufficient oxygen, and the oxygenation of the artificial wetland mainly relies on plant photosynthesis and atmospheric reoxygenation, so that the requirements of the microorganisms can not be met in practical operation. The constructed wetland mainly depends on regular harvest of plants and substrate adsorption, and the plants are withered and even die in a large amount during winter operation, so that the removal of phosphorus is influenced. The artificial wetland has higher requirement on the inflow suspended matters, and if the pretreatment is not good for removing the suspended matters, the blockage of a wetland system is caused, and the effluent effect of the wetland is seriously influenced. Therefore, the development of a system which has good effect of removing suspended matters and enhances the nitrogen and phosphorus removal effect of the artificial wetland is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to provide a high-efficiency composite flow constructed wetland system and an implementation method of the high-efficiency composite flow constructed wetland system.

In order to solve the technical problems, the invention adopts the following technical scheme: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank, a full-automatic backwashing filter, a high-efficiency composite flow constructed wetland, a pipeline A and a pipeline B, wherein the grid regulating tank is connected with the full-automatic backwashing filter through the pipeline A, and the full-automatic backwashing filter is connected with the high-efficiency composite flow constructed wetland through the pipeline B; and (3) regularly discharging sediments, trapped matters and peeled biological membranes generated in the wetland operation process out of the wetland unit to ensure smooth water flow in the wetland.

The grid regulating tank comprises a grid well and a hydrolysis acidification regulating tank, the grid well is connected with the hydrolysis acidification regulating tank, an elastic three-dimensional filler and a water inlet pump are arranged in the hydrolysis acidification regulating tank, the water inlet pump is connected with a pipeline A, and a valve A is arranged on the pipeline A; the elastic three-dimensional filler intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland water inflow, and the effluent has no bad smell of anaerobic fermentation, so that the surrounding environment is not influenced.

The high-efficiency composite flow constructed wetland system comprises a vertical flow constructed wetland, a horizontal subsurface flow constructed wetland, a water outlet well and a membrane inversion well, wherein a water inlet channel is arranged between the vertical flow constructed wetland and the horizontal subsurface flow constructed wetland and is arranged on the side wall of the bottom of the vertical flow constructed wetland; the sewage is divided into two parts, one part directly enters the vertical flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the denitrification is carried out, the water inlet channel enables the sewage between the vertical flow artificial wetland and the horizontal subsurface flow artificial wetland to be mixed, and the backwashing pipeline carries out backwashing treatment on the high-efficiency composite flow artificial wetland.

In the efficient composite flow artificial wetland system, the upper part of the vertical flow artificial wetland is provided with a water distribution perforated pipe a, a plurality of water distribution holes a are equidistantly distributed on the water distribution perforated pipe a, the aperture of the water distribution holes a is 10mm, the lower part of the vertical flow artificial wetland is provided with a film falling perforated pipe a, a plurality of film falling holes a are equidistantly distributed on the film falling perforated pipe a, and the aperture of the film falling holes a is 20 mm; the A water distribution perforated pipe is used for carrying out water distribution treatment on the vertical flow artificial wetland, and the A inverted film perforated pipe is used for carrying out dredging treatment on the vertical flow artificial wetland.

The high-efficiency composite flow constructed wetland system is characterized in that an A partition plate and a B partition plate are arranged in the horizontal subsurface flow constructed wetland, the left side of the A partition plate is connected with the inner wall of the horizontal subsurface flow constructed wetland, the distance between the right side of the A partition plate and the inner wall of the horizontal subsurface flow constructed wetland is D1, the right side of the B partition plate is connected with the inner wall of the horizontal subsurface flow constructed wetland, the distance between the left side of the B partition plate and the inner wall of the horizontal subsurface flow constructed wetland is D2, D1 is D2, the A partition plate is arranged below the B partition plate, a water inlet channel is arranged below the A partition plate, a water collecting perforated pipe is arranged above the B partition plate, the water collecting perforated pipe is connected with a water outlet well, a plurality of water collecting holes are distributed on the water collecting perforated pipe at equal intervals, the aperture of the water collecting holes is 15mm, a B water distribution perforated pipe and a B inverted film perforated pipe are arranged at the lower part of the horizontal subsurface flow constructed wetland, and the B water distribution perforated pipe and the B, a plurality of water distribution holes B are distributed on the water distribution perforated pipe B at equal intervals, the aperture of the water distribution holes B is 10mm, a plurality of inverted film holes B are distributed on the inverted film perforated pipe B at equal intervals, and the aperture of the inverted film holes B is 20 mm; a partition plate A and a partition plate B are arranged in the horizontal subsurface flow constructed wetland and are designed into a horizontal baffle plate flow form, the vertical flow constructed wetland forms flooding and drying conditions of the wetland by periodically feeding and discharging water to realize natural oxygenation, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the overall nitrogen and phosphorus removal effect of the system is improved, a water distribution perforated pipe B performs water distribution treatment on the horizontal subsurface flow constructed wetland, and a membrane inversion perforated pipe B performs desilting treatment on the horizontal subsurface flow constructed wetland.

In the high-efficiency composite flow constructed wetland system, a vertical flow wetland planting layer is arranged in the vertical flow constructed wetland, a horizontal subsurface flow wetland planting layer is arranged in the horizontal subsurface flow constructed wetland, the vertical flow wetland planting layer is sequentially provided with a coarse sand layer with the thickness of 100mm, a gravel layer with the thickness of 500mm, a zeolite layer with the thickness of 500mm, a coarse sand layer with the thickness of 200mm and planting soil with the thickness of 200mm from bottom to top, the horizontal subsurface flow wetland planting layer is sequentially provided with a coarse sand layer with the thickness of 100mm, a blast furnace slag layer with the thickness of 400mm, a dolomite layer with the thickness of 400mm, a coarse sand layer with the thickness of 200mm and planting soil with the thickness of 200mm from bottom to top, a plurality of plants are arranged on the planting soil at equal intervals, the particle size of coarse sand in the coarse sand layer is 0.9-1.2mm, the particle size of gravel in the gravel layer is 80-120mm, and the particle size of zeolite in the zeolite layer is 20-60mm, the grain size of the blast furnace slag in the blast furnace slag layer is 80-120mm, and the grain size of the dolomite in the dolomite layer is 15-60 mm.

According to the efficient composite flow constructed wetland system, the water distribution perforated pipe A is connected with the water inlet branch pipe A, the film pouring perforated pipe A is connected with the film pouring well through a pipeline, and an E valve is arranged on a pipe section between the film pouring perforated pipe A and the film pouring well.

According to the efficient composite flow constructed wetland system, the water distribution perforated pipe B is connected with the water inlet branch pipe B, the film pouring perforated pipe B is connected with the film pouring well pipeline, and an F valve is arranged on a pipe section between the film pouring perforated pipe B and the film pouring well.

In the high-efficiency composite flow constructed wetland system, a G valve is arranged on a pipe section between the water collecting perforated pipe and the water outlet well, a C pipe and a D pipe are arranged on a pipe section between the G valve and the water collecting perforated pipe, an H valve is arranged on the C pipe, an I valve is arranged on the D pipe, one end of the D pipe is connected to the pipe section between the G valve and the water collecting perforated pipe, and the other end of the D pipe is connected to the pipe section between the D valve and the lift pump; the G valve and the H valve are adjusted to open according to different high and low liquid levels of the water outlet well, the H valve is opened when the inflow water is large, and the G valve is opened when the inflow water is small.

An implementation method of an efficient composite flow constructed wetland system comprises the following steps:

s1, covering the polyethylene plastic film on the inner surface of the vertical flow artificial wetland for anti-seepage treatment, and covering the polyethylene plastic film on the inner surface of the horizontal subsurface flow artificial wetland for anti-seepage treatment;

s2, covering geotextile on the polyethylene plastic film;

s3, installing the water distribution perforated pipe A on the upper part of the vertical flow artificial wetland, installing the inverted film perforated pipe A on the lower part of the vertical flow artificial wetland, installing the water distribution perforated pipe B and the inverted film perforated pipe B on the lower part of the horizontal subsurface flow artificial wetland, installing the partition plate A on the left side wall of the horizontal subsurface flow artificial wetland, installing the partition plate B on the right side wall of the horizontal subsurface flow artificial wetland, and installing the water collection perforated pipe above the partition plate B;

s4, laying a vertical flow wetland planting layer in a vertical flow artificial wetland, firstly laying a coarse sand layer with the thickness of 100mm at the bottom of the vertical flow artificial wetland and leveling, then laying a gravel layer with the thickness of 500mm and leveling, then laying a zeolite layer with the thickness of 500mm and leveling, then laying a coarse sand layer with the thickness of 200mm and leveling, finally laying planting soil with the thickness of 200mm and leveling and compacting, and planting a plurality of plants at equal intervals in the planting soil;

s5, laying a horizontal subsurface flow wetland planting layer in a horizontal subsurface flow constructed wetland, firstly laying a coarse sand layer with the thickness of 100mm at the bottom of the horizontal subsurface flow constructed wetland and leveling, then laying a blast furnace slag layer with the thickness of 400mm and leveling, then laying a dolomite layer with the thickness of 400mm and leveling, then laying a coarse sand layer with the thickness of 200mm and leveling, finally laying planting soil with the thickness of 200mm and leveling and compacting, and planting a plurality of plants at equal intervals in the planting soil;

s6, the sewage in the grid well enters a hydrolytic acidification regulating tank for hydrolytic acidification treatment, and the retention time is 3-5 h;

s7, opening the valve A, and conveying the sewage subjected to hydrolytic acidification treatment to a full-automatic backwashing filter through a pipeline A by a water inlet pump for filtering treatment;

s8, opening a valve B, enabling the filtered sewage to enter a water distribution perforated pipe A through a water inlet branch pipe A, enabling a water distribution hole A to convey the filtered sewage to the vertical flow wetland planting layer, opening a valve C, enabling the filtered sewage to enter a water distribution perforated pipe B through a water inlet branch pipe B, and enabling the water distribution hole A to convey the filtered sewage to the horizontal subsurface flow wetland planting layer;

s9, the sewage in the vertical flow artificial wetland 11 permeates from top to bottom through the vertical flow wetland planting layer, part of organic matters, SS and complete nitrification are removed, then the sewage enters the lower part of the horizontal subsurface flow artificial wetland through the water inlet channel, and after the sewage is mixed with part of untreated sewage conveyed by the water inlet branch pipe B, reciprocating flow is formed through the partition boards A and the partition boards B, an aerobic environment and an anoxic environment are formed alternately, and the denitrification effect of the sewage is realized. The removal effect on the phosphorus in the sewage is completed through the horizontal subsurface flow wetland planting layer. Finally, after the sewage is collected by the water collecting perforated pipe, opening a valve G and a valve H to enable the sewage after nitrogen and phosphorus removal to enter a water outlet well for discharging;

s10, after the high-efficiency composite flow constructed wetland operates for 60-75 days, dredging treatment is needed; closing the valve B and the valve C, the valve G and the valve H, and simultaneously opening the valve D and the valve I, when the filler in the high-efficiency subsurface flow constructed wetland is submerged by the inflow water, closing a lift pump, the valve D and the valve I in the water outlet well, and after the filler is fully infiltrated, opening the valve E and the valve F in the drainage well for dredging treatment so as to ensure the smooth flow of the water in the wetland;

and S11, after the flushing is finished, closing the valve E and the valve F, and re-opening the water inlet pump and the valve B and the valve C on the water inlet pipeline, so that the high-efficiency subsurface flow constructed wetland can work normally.

Compared with the prior art, the invention comprises a grid regulating tank, a full-automatic backwashing filter, a high-efficiency composite flow constructed wetland, a pipeline A and a pipeline B, wherein the grid regulating tank is connected with the full-automatic backwashing filter through the pipeline A, the full-automatic backwashing filter is connected with the high-efficiency composite flow constructed wetland through the pipeline B, the grid regulating tank comprises a grid well and a hydrolysis acidification regulating tank, the grid well is connected with the hydrolysis acidification regulating tank, an elastic three-dimensional filler and a water inlet pump are arranged in the hydrolysis acidification regulating tank, the water inlet pump is connected with the pipeline A, the pipeline A is provided with a valve, the high-efficiency composite flow constructed wetland comprises a vertical flow constructed wetland, a horizontal subsurface flow constructed wetland, a water outlet well and a membrane inversion well, the pipeline B comprises a water inlet branch pipe A and a water inlet branch pipe B, the water inlet branch pipe A is provided with a valve B, and the water inlet branch pipe B is provided with a valve C, the invention also provides an, the invention periodically discharges sediments, intercepted matters and peeled biological membranes generated in the operation process of the wetland out of a wetland unit, ensures the smooth water flow in the wetland, the elastic three-dimensional filler intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inflow, and divides the effluent into two parts, one part directly enters the vertical flow artificial wetland, and the other part directly enters the bottom of the horizontal subsurface flow artificial wetland to carry out denitrification reaction with nitrifying liquid, thereby carrying out denitrification.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of a water distribution perforated pipe in the invention;

FIG. 3 is a schematic diagram of a reverse perforated tube A according to the present invention;

FIG. 4 is a schematic view of the structure of the water collecting perforated pipe of the present invention;

FIG. 5 is a schematic structural view of a water distribution perforated pipe B in the present invention;

FIG. 6 is a schematic diagram of a B-pour perforated tube according to the present invention;

FIG. 7 is a schematic structural view of a vertical flow wetland planting layer in the invention;

fig. 8 is a schematic structural view of the horizontal subsurface wetland planting layer in the invention.

Reference numerals: 1-a grid adjusting tank, 2-a full-automatic backwashing filter, 3-a high-efficiency composite flow artificial wetland, 4-a pipelines, 5-B pipelines, 6-a grid well, 7-a hydrolysis acidification adjusting tank, 8-elastic three-dimensional filler, 9-a water inlet pump, 10-a valve, 11-vertical flow artificial wetland, 12-horizontal subsurface flow artificial wetland, 13-water outlet well, 14-inverted membrane well, 15-a water inlet branch pipe, 16-B water inlet branch pipe, 17-backwashing pipeline, 18-B valve, 19-C valve, 20-D valve, 21-lift pump, 22-a perforated pipe, 23-a water distribution hole, 24-a inverted membrane perforated pipe, 25-a inverted membrane hole, 26-a partition plate and 27-B partition plate, 28-water collecting perforated pipe, 29-water collecting hole, 30-B water distribution perforated pipe, 31-B inverted film perforated pipe, 32-B water distribution hole, 33-B inverted film hole, 34-vertical flow wetland planting layer, 35-horizontal subsurface flow wetland planting layer, 36-coarse sand layer, 37-gravel layer, 38-zeolite layer, 39-planting soil, 40-blast furnace slag layer, 41-dolomite layer, 42-plant, 43-E valve, 44-F valve, 45-G valve, 46-C pipeline, 47-D pipeline, 48-H valve, 49-I valve and 50-water inlet channel.

The invention is further described with reference to the following figures and detailed description.

Detailed Description

Example 1 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; and (3) regularly discharging sediments, trapped matters and peeled biological membranes generated in the wetland operation process out of the wetland unit to ensure smooth water flow in the wetland.

Example 2 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland water inflow, and has no bad smell of anaerobic fermentation when yielding water, thereby not affecting the surrounding environment.

Example 3 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; the sewage is divided into two parts, one part directly enters the vertical flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, and the back flushing pipeline 17 carries out back flushing treatment on the high-efficiency composite flow artificial wetland 3.

Example 4 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 performs water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 performs dredging treatment on the vertical flow artificial wetland 11.

Example 5 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; a partition plate 26 and a partition plate 27 are arranged in the horizontal subsurface flow constructed wetland and are designed into a horizontal baffle plate flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland through periodic water inlet and outlet, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed through design of a folded plate of horizontal flow, the nitrification and denitrification effects are enhanced, the nitrogen and phosphorus removal effect of the whole system is improved, a water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a reverse membrane perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12.

Example 6 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; the horizontal subsurface flow constructed wetland is internally provided with an A clapboard 26 and a B clapboard 27 which are designed into a horizontal baffle flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland by periodically feeding and discharging water, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the integral nitrogen and phosphorus removal effect of the system is improved, a B water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a B inverted film perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12; a vertical flow wetland planting layer 34 is arranged in the vertical flow wetland 11, a horizontal subsurface flow wetland planting layer 35 is arranged in the horizontal subsurface flow wetland 12, a coarse sand layer 36 with the thickness of 100mm, a gravel layer 37 with the thickness of 500mm, a zeolite layer 38 with the thickness of 500mm, a coarse sand layer 36 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the vertical flow wetland planting layer 34 from bottom to top, the coarse sand layer 36 with the thickness of 100mm, a blast furnace slag layer 40 with the thickness of 400mm, a dolomite layer 41 with the thickness of 400mm, the coarse sand layer 36 with the thickness of 200mm and the planting soil 39 with the thickness of 200mm are sequentially arranged on the horizontal subsurface flow wetland planting layer 35 from bottom to top, a plurality of plants 42 are arranged on the planting soil 39 at equal intervals, the particle size of coarse sand in the coarse sand layer 36 is 0.9-1.2mm, the particle size of gravel in the gravel layer 37 is 80-120mm, and the particle size of zeolite in the zeolite layer 38 is 20-60mm, the grain size of the blast furnace slag in the blast furnace slag layer 40 is 80-120mm, and the grain size of the dolomite in the dolomite layer 41 is 15-60 mm.

Example 7 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; the horizontal subsurface flow constructed wetland is internally provided with an A clapboard 26 and a B clapboard 27 which are designed into a horizontal baffle flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland by periodically feeding and discharging water, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the integral nitrogen and phosphorus removal effect of the system is improved, a B water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a B inverted film perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12; a vertical flow wetland planting layer 34 is arranged in the vertical flow wetland 11, a horizontal subsurface flow wetland planting layer 35 is arranged in the horizontal subsurface flow wetland 12, a coarse sand layer 36 with the thickness of 100mm, a gravel layer 37 with the thickness of 500mm, a zeolite layer 38 with the thickness of 500mm, a coarse sand layer 36 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the vertical flow wetland planting layer 34 from bottom to top, the coarse sand layer 36 with the thickness of 100mm, a blast furnace slag layer 40 with the thickness of 400mm, a dolomite layer 41 with the thickness of 400mm, the coarse sand layer 36 with the thickness of 200mm and the planting soil 39 with the thickness of 200mm are sequentially arranged on the horizontal subsurface flow wetland planting layer 35 from bottom to top, a plurality of plants 42 are arranged on the planting soil 39 at equal intervals, the particle size of coarse sand in the coarse sand layer 36 is 0.9-1.2mm, the particle size of gravel in the gravel layer 37 is 80-120mm, and the particle size of zeolite in the zeolite layer 38 is 20-60mm, the grain size of the blast furnace slag in the blast furnace slag layer 40 is 80-120mm, and the grain size of the dolomite in the dolomite layer 41 is 15-60 mm; the A water distribution perforated pipe 22 is connected with the A water inlet branch pipe 15, the A film pouring perforated pipe 24 is in pipeline connection with the film pouring well 14, and an E valve 43 is arranged on a pipe section between the A film pouring perforated pipe 24 and the film pouring well 14.

Example 8 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; the horizontal subsurface flow constructed wetland is internally provided with an A clapboard 26 and a B clapboard 27 which are designed into a horizontal baffle flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland by periodically feeding and discharging water, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the integral nitrogen and phosphorus removal effect of the system is improved, a B water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a B inverted film perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12; a vertical flow wetland planting layer 34 is arranged in the vertical flow wetland 11, a horizontal subsurface flow wetland planting layer 35 is arranged in the horizontal subsurface flow wetland 12, a coarse sand layer 36 with the thickness of 100mm, a gravel layer 37 with the thickness of 500mm, a zeolite layer 38 with the thickness of 500mm, a coarse sand layer 36 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the vertical flow wetland planting layer 34 from bottom to top, the coarse sand layer 36 with the thickness of 100mm, a blast furnace slag layer 40 with the thickness of 400mm, a dolomite layer 41 with the thickness of 400mm, the coarse sand layer 36 with the thickness of 200mm and the planting soil 39 with the thickness of 200mm are sequentially arranged on the horizontal subsurface flow wetland planting layer 35 from bottom to top, a plurality of plants 42 are arranged on the planting soil 39 at equal intervals, the particle size of coarse sand in the coarse sand layer 36 is 0.9-1.2mm, the particle size of gravel in the gravel layer 37 is 80-120mm, and the particle size of zeolite in the zeolite layer 38 is 20-60mm, the grain size of the blast furnace slag in the blast furnace slag layer 40 is 80-120mm, and the grain size of the dolomite in the dolomite layer 41 is 15-60 mm; the A water distribution perforated pipe 22 is connected with the A water inlet branch pipe 15, the A film pouring perforated pipe 24 is in pipeline connection with the film pouring well 14, and an E valve 43 is arranged on a pipe section between the A film pouring perforated pipe 24 and the film pouring well 14; the water distribution perforated pipe B30 is connected with the water inlet branch pipe B16, the film pouring perforated pipe B31 is in pipeline connection with the film pouring well 14, and an F valve 44 is arranged on a pipe section between the film pouring perforated pipe B31 and the film pouring well 14.

Example 9 of the invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; the horizontal subsurface flow constructed wetland is internally provided with an A clapboard 26 and a B clapboard 27 which are designed into a horizontal baffle flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland by periodically feeding and discharging water, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the integral nitrogen and phosphorus removal effect of the system is improved, a B water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a B inverted film perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12; a vertical flow wetland planting layer 34 is arranged in the vertical flow wetland 11, a horizontal subsurface flow wetland planting layer 35 is arranged in the horizontal subsurface flow wetland 12, a coarse sand layer 36 with the thickness of 100mm, a gravel layer 37 with the thickness of 500mm, a zeolite layer 38 with the thickness of 500mm, a coarse sand layer 36 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the vertical flow wetland planting layer 34 from bottom to top, the coarse sand layer 36 with the thickness of 100mm, a blast furnace slag layer 40 with the thickness of 400mm, a dolomite layer 41 with the thickness of 400mm, the coarse sand layer 36 with the thickness of 200mm and the planting soil 39 with the thickness of 200mm are sequentially arranged on the horizontal subsurface flow wetland planting layer 35 from bottom to top, a plurality of plants 42 are arranged on the planting soil 39 at equal intervals, the particle size of coarse sand in the coarse sand layer 36 is 0.9-1.2mm, the particle size of gravel in the gravel layer 37 is 80-120mm, and the particle size of zeolite in the zeolite layer 38 is 20-60mm, the grain size of the blast furnace slag in the blast furnace slag layer 40 is 80-120mm, and the grain size of the dolomite in the dolomite layer 41 is 15-60 mm; the A water distribution perforated pipe 22 is connected with the A water inlet branch pipe 15, the A film pouring perforated pipe 24 is in pipeline connection with the film pouring well 14, and an E valve 43 is arranged on a pipe section between the A film pouring perforated pipe 24 and the film pouring well 14; the water distribution perforated pipe B30 is connected with the water inlet branch pipe B16, the film pouring perforated pipe B31 is in pipeline connection with the film pouring well 14, and an F valve 44 is arranged on a pipe section between the film pouring perforated pipe B31 and the film pouring well 14; a G valve 45 is arranged on a pipe section between the water collecting perforated pipe 28 and the water outlet well 13, a C pipe 46 and a D pipe 47 are arranged on a pipe section between the G valve 45 and the water collecting perforated pipe 28, an H valve 48 is arranged on the C pipe 46, an I valve 49 is arranged on the D pipe 47, one end of the D pipe 47 is connected to the pipe section between the G valve 45 and the water collecting perforated pipe 28, and the other end of the D pipe 47 is connected to the pipe section between the D valve 20 and the lift pump 21; the G valve 45 and the H valve 48 are adjusted to open according to different levels of the water outlet well 13, when the water inflow is large, the H valve 48 is opened, and when the water inflow is small, the G valve 45 is opened.

s1, covering the polyethylene plastic film on the inner surface of the vertical flow artificial wetland 11 for anti-seepage treatment, and covering the polyethylene plastic film on the inner surface of the horizontal subsurface flow artificial wetland 12 for anti-seepage treatment;

s2, covering geotextile on the polyethylene plastic film;

s3, mounting the A water distribution perforated pipe 22 on the upper part of the vertical flow artificial wetland 11, mounting the A inverted film perforated pipe 24 on the lower part of the vertical flow artificial wetland 11, mounting the B water distribution perforated pipe 30 and the B inverted film perforated pipe 31 on the lower part of the horizontal subsurface flow artificial wetland 12, mounting the A clapboard 26 on the left side wall of the horizontal subsurface flow artificial wetland 12, mounting the B clapboard 27 on the right side wall of the horizontal subsurface flow artificial wetland 12, and mounting the water collection perforated pipe 28 above the B clapboard 27;

s4, paving the vertical flow wetland planting layer 34 in the vertical flow artificial wetland 11, paving and leveling a coarse sand layer 36 with the thickness of 100mm at the bottom of the vertical flow artificial wetland 11, paving and leveling a gravel layer 37 with the thickness of 500mm, paving and leveling a zeolite layer 38 with the thickness of 500mm, paving and leveling a coarse sand layer 36 with the thickness of 200mm, paving and leveling and compacting planting soil 39 with the thickness of 200mm, and planting a plurality of plants 42 at equal intervals in the planting soil 39;

s5, paving the horizontal subsurface flow wetland planting layer 35 in the horizontal subsurface flow constructed wetland 12, paving and leveling a coarse sand layer 36 with the thickness of 100mm at the bottom of the horizontal subsurface flow constructed wetland 12, then paving and leveling a blast furnace slag layer 40 with the thickness of 400mm, then paving and leveling a dolomite layer 41 with the thickness of 400mm, then paving and leveling a coarse sand layer 36 with the thickness of 200mm, finally paving and leveling and compacting planting soil 39 with the thickness of 200mm, and planting a plurality of plants 42 at equal intervals in the planting soil 39;

s6, the sewage in the grid well 6 enters a hydrolytic acidification regulating tank 7 for hydrolytic acidification treatment, and the retention time is 3-5 h;

s7, opening the valve A10, and conveying the sewage subjected to hydrolytic acidification treatment to the full-automatic backwashing filter 2 through the pipeline A4 by the water inlet pump 9 for filtering treatment;

s8, opening the valve B18, enabling the filtered sewage to enter the water distribution perforated pipe A22 through the water inlet branch pipe A15, enabling the water distribution holes A23 to convey the filtered sewage to the vertical flow wetland planting layer 34, opening the valve C19, enabling the filtered sewage to enter the water distribution perforated pipe B30 through the water inlet branch pipe B16, and enabling the water distribution holes A23 to convey the filtered sewage to the horizontal subsurface flow wetland planting layer 35;

s9, the sewage in the vertical flow artificial wetland 11 permeates from top to bottom through the vertical flow wetland planting layer 34, part of organic matters and SS are removed and completely nitrified, then the sewage enters the lower part of the horizontal subsurface flow artificial wetland 12 through the water inlet channel 50, and after being mixed with part of untreated sewage conveyed by the water inlet branch pipe 16B, the sewage forms reciprocating flow through the partition boards A26 and the partition boards B27, an aerobic environment and an anoxic environment are alternately formed, and the denitrification and denitrification of the sewage are realized. The removal of phosphorus in the sewage is completed through the horizontal subsurface flow wetland planting layer 35. Finally, after the sewage is collected by the water collecting perforated pipe 28, opening a G valve 45 and an H valve 48 to enable the sewage after nitrogen and phosphorus removal to enter the water outlet well 13 for discharging;

s10, after the high-efficiency composite flow artificial wetland 3 runs for 60-75 days, dredging treatment is needed; closing the valve B18 and the valve C19, the valve G45 and the valve H48, and simultaneously opening the valve D20 and the valve I49, when the filler in the high-efficiency subsurface flow constructed wetland 3 is submerged by the inflow water, closing the lift pump 21, the valve D20 and the valve I49 in the water outlet well 13, and after the filler is fully infiltrated, opening the valve E43 and the valve F44 in the water outlet well 14 for dredging treatment to ensure that the water flow in the wetland is smooth;

and S11, after the flushing is finished, closing the valve E43 and the valve F44, and re-opening the water inlet pump 9 and the valve B18 and the valve C19 on the water inlet pipeline, so that the high-efficiency subsurface flow constructed wetland 3 can work normally.

Example 10 of the present invention: a high-efficiency composite flow constructed wetland system comprises a grid regulating tank 1, a full-automatic backwashing filter 2, a high-efficiency composite flow constructed wetland 3, an A pipeline 4 and a B pipeline 5, wherein the grid regulating tank 1 is connected with the full-automatic backwashing filter 2 through the A pipeline 4, and the full-automatic backwashing filter 2 is connected with the high-efficiency composite flow constructed wetland 3 through the B pipeline 5; the sediments, the trapped matters and the peeled biological membranes generated in the wetland operation process are discharged out of the wetland unit at regular intervals, so that the water flow in the wetland is ensured to be smooth; the grid adjusting tank 1 comprises a grid well 6 and a hydrolysis acidification adjusting tank 7, the grid well 6 is connected with the hydrolysis acidification adjusting tank 7, an elastic three-dimensional filler 8 and a water inlet pump 9 are arranged in the hydrolysis acidification adjusting tank 7, the water inlet pump 9 is connected with the pipeline A4, and the pipeline A4 is provided with a valve A10; the elastic three-dimensional filler 8 intercepts and adsorbs small particles, decomposes macromolecular organic matters into small molecules convenient for oxidation treatment, removes partial organic matters, improves the biodegradability of wetland inlet water, and ensures that the outlet water has no bad smell of anaerobic fermentation and does not influence the surrounding environment; the high-efficiency composite flow artificial wetland 3 comprises a vertical flow artificial wetland 11, a horizontal subsurface flow artificial wetland 12, a water outlet well 13 and a membrane pouring well 14, wherein a water inlet channel 50 is arranged between the vertical flow artificial wetland 11 and the horizontal subsurface flow artificial wetland 12, the water inlet channel 50 is arranged on the side wall of the bottom of the vertical flow artificial wetland 11, the B pipeline 5 comprises an A water inlet branch pipe 15, a B water inlet branch pipe 16 and a backwashing pipeline 17, the A water inlet branch pipe 15 is provided with a B valve 18, the B water inlet branch pipe 16 is provided with a C valve 19, the backwashing pipeline 17 is provided with a D valve 20, the bottom of the water outlet well 13 is provided with a lifting pump 21, and the backwashing pipeline 17 is connected with the lifting pump 21; dividing the sewage into two parts, wherein one part directly enters the vertical-flow artificial wetland, the other part directly enters the bottom of the horizontal subsurface-flow artificial wetland to carry out denitrification reaction with the nitrifying liquid, the water inlet channel 50 mixes the sewage between the vertical-flow artificial wetland 11 and the horizontal subsurface-flow artificial wetland 12, and the backwashing pipeline 17 carries out backwashing treatment on the high-efficiency composite-flow artificial wetland 3; the upper part of the vertical flow artificial wetland 11 is provided with an A water distribution perforated pipe 22, a plurality of A water distribution holes 23 are distributed on the A water distribution perforated pipe 22 at equal intervals, the aperture of the A water distribution holes 23 is 10mm, the lower part of the vertical flow artificial wetland 11 is provided with an A inverted film perforated pipe 24, a plurality of A inverted film holes 25 are distributed on the A inverted film perforated pipe 24 at equal intervals, and the aperture of the A inverted film holes 25 is 20 mm; the A water distribution perforated pipe 22 is used for carrying out water distribution treatment on the vertical flow artificial wetland 11, and the A inverted film perforated pipe 24 is used for carrying out desilting treatment on the vertical flow artificial wetland 11; the horizontal subsurface flow constructed wetland 12 is internally provided with an A clapboard 26 and a B clapboard 27, the left side of the A clapboard 26 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the right side of the A clapboard 26 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D1, the right side of the B clapboard 27 is connected with the inner wall of the horizontal subsurface flow constructed wetland 12, the distance between the left side of the B clapboard 27 and the inner wall of the horizontal subsurface flow constructed wetland 12 is D2, D1 is D2, the A clapboard 26 is arranged below the B clapboard 27, a water inlet channel 50 is arranged below the A clapboard 26, a water collecting perforated pipe 28 is arranged above the B clapboard 27, the water collecting perforated pipe 28 is connected with a water outlet well 13, a plurality of water collecting holes 29 are distributed on the water collecting perforated pipe 28 at equal intervals, the aperture of the water collecting holes 29 is 15mm, the lower part of the horizontal subsurface flow constructed wetland 12 is provided with a B water distributing perforated pipe 30 and a B inverted water distributing perforated pipe 31, the water distribution perforated pipe 30 and the inverted film perforated pipe 31B are both arranged below the baffle plate 27B, a plurality of water distribution holes 32B are distributed on the water distribution perforated pipe 30B at equal intervals, the aperture of the water distribution holes 32B is 10mm, a plurality of inverted film holes 33B are distributed on the inverted film perforated pipe 31B at equal intervals, and the aperture of the inverted film holes 33B is 20 mm; the horizontal subsurface flow constructed wetland is internally provided with an A clapboard 26 and a B clapboard 27 which are designed into a horizontal baffle flow form, the vertical flow constructed wetland 11 realizes natural oxygenation by forming flooding and drying conditions of the wetland by periodically feeding and discharging water, fully nitrifies organic matters and then enters the horizontal subsurface flow constructed wetland 12, an aerobic and anaerobic environment is formed by designing a horizontal flow folded plate, the nitrification and denitrification effects are enhanced, the integral nitrogen and phosphorus removal effect of the system is improved, a B water distribution perforated pipe 30 performs water distribution treatment on the horizontal subsurface flow constructed wetland 12, and a B inverted film perforated pipe 31 performs desilting treatment on the horizontal subsurface flow constructed wetland 12; a vertical flow wetland planting layer 34 is arranged in the vertical flow artificial wetland 11, a horizontal subsurface flow wetland planting layer 35 is arranged in the horizontal subsurface flow artificial wetland 12, a coarse sand layer 36 with the thickness of 100mm, a gravel layer 37 with the thickness of 500mm, a zeolite layer 38 with the thickness of 500mm, a coarse sand layer 36 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the vertical flow wetland planting layer 34 from bottom to top, a coarse sand layer 36 with the thickness of 100mm, a blast furnace slag layer 40 with the thickness of 400mm, a dolomite layer 41 with the thickness of 400mm, a plurality of plants 42 with the thickness of 200mm and planting soil 39 with the thickness of 200mm are sequentially arranged on the horizontal subsurface flow wetland planting layer 35 from bottom to top, the particle size of coarse sand in the coarse sand layer 36 is 0.9-1.2mm, preferably 1.1mm, the particle size of gravel in the gravel layer 37 is 80-120mm, preferably 100mm, the zeolite in the zeolite layer 38 has a particle size of 20-60mm, preferably 40mm, the blast furnace slag in the blast furnace slag layer 40 has a particle size of 80-120mm, preferably 100mm, and the dolomite in the dolomite layer 41 has a particle size of 15-60mm, preferably 45 mm; the A water distribution perforated pipe 22 is connected with the A water inlet branch pipe 15, the A film pouring perforated pipe 24 is in pipeline connection with the film pouring well 14, and an E valve 43 is arranged on a pipe section between the A film pouring perforated pipe 24 and the film pouring well 14; the water distribution perforated pipe B30 is connected with the water inlet branch pipe B16, the film pouring perforated pipe B31 is in pipeline connection with the film pouring well 14, and an F valve 44 is arranged on a pipe section between the film pouring perforated pipe B31 and the film pouring well 14; a G valve 45 is arranged on a pipe section between the water collecting perforated pipe 28 and the water outlet well 13, a C pipe 46 and a D pipe 47 are arranged on a pipe section between the G valve 45 and the water collecting perforated pipe 28, an H valve 48 is arranged on the C pipe 46, an I valve 49 is arranged on the D pipe 47, one end of the D pipe 47 is connected to the pipe section between the G valve 45 and the water collecting perforated pipe 28, and the other end of the D pipe 47 is connected to the pipe section between the D valve 20 and the lift pump 21; the G valve 45 and the H valve 48 are adjusted to open according to different levels of the water outlet well 13, when the water inflow is large, the H valve 48 is opened, and when the water inflow is small, the G valve 45 is opened.

s2, covering geotextile on the polyethylene plastic film;

s6, the sewage in the grid well 6 enters a hydrolytic acidification regulating tank 7 for hydrolytic acidification treatment, and the retention time is 3-5h, preferably 4 h;

s10, after the high-efficiency composite flow artificial wetland 3 runs for 60-75 days, preferably 70 days, dredging treatment is needed; closing the valve B18 and the valve C19, the valve G45 and the valve H48, and simultaneously opening the valve D20 and the valve I49, when the filler in the high-efficiency subsurface flow constructed wetland 3 is submerged by the inflow water, closing the lift pump 21, the valve D20 and the valve I49 in the water outlet well 13, and after the filler is fully infiltrated, opening the valve E43 and the valve F44 in the water outlet well 14 for dredging treatment to ensure that the water flow in the wetland is smooth;

The working principle of one embodiment of the invention is as follows: when the device works, sewage in the grid well 6 enters the hydrolysis acidification regulating tank 7 for hydrolysis acidification treatment, and the retention time is 3-5 h; opening the valve A10, and conveying the sewage subjected to hydrolytic acidification treatment to the full-automatic backwashing filter 2 through the pipeline A4 by the water inlet pump 9 for filtering treatment; opening a valve B18, enabling the filtered sewage to enter a water distribution perforated pipe A22 through a water inlet branch pipe A15, enabling a water distribution hole A23 to convey the filtered sewage to a vertical flow wetland planting layer 34, opening a valve C19, enabling the filtered sewage to enter a water distribution perforated pipe B30 through a water inlet branch pipe B16, and enabling the water distribution hole A23 to convey the filtered sewage to a horizontal subsurface flow wetland planting layer 35; the sewage in the vertical flow artificial wetland 11 permeates from top to bottom through the vertical flow wetland planting layer 34, part of organic matters, SS and complete nitrification are removed, then the sewage enters the lower part of the horizontal subsurface flow artificial wetland 12 through the water inlet channel 50, and after the sewage is mixed with part of untreated sewage conveyed by the water inlet branch pipe 16B, reciprocating flow is formed through the partition plates A26 and the partition plates B27, an aerobic environment and an anoxic environment are formed alternately, and denitrification of the sewage is realized. The removal of phosphorus in the sewage is completed through the horizontal subsurface flow wetland planting layer 35. Finally, after the sewage is collected by the water collecting perforated pipe 28, opening a G valve 45 and an H valve 48 to enable the sewage after nitrogen and phosphorus removal to enter the water outlet well 13 for discharging; after the high-efficiency composite flow constructed wetland 3 runs for 60-75 days, dredging treatment is required; closing the valve B18 and the valve C19, the valve G45 and the valve H48, and simultaneously opening the valve D20 and the valve I49, when the filler in the high-efficiency subsurface flow constructed wetland 3 is submerged by the inflow water, closing the lift pump 21, the valve D20 and the valve I49 in the water outlet well 13, and after the filler is fully infiltrated, opening the valve E43 and the valve F44 in the water outlet well 14 for dredging treatment to ensure that the water flow in the wetland is smooth; after the flushing is finished, the valve E43 and the valve F44 are closed, the water inlet pump 9 and the valve B18 and the valve C19 on the water inlet pipeline are opened again, and the high-efficiency subsurface flow constructed wetland 3 works normally.

Claims

1. The high-efficiency composite flow constructed wetland system is characterized by comprising a grid regulating tank (1), a full-automatic backwashing filter (2), a high-efficiency composite flow constructed wetland (3), an A pipeline (4) and a B pipeline (5), wherein the grid regulating tank (1) is connected with the full-automatic backwashing filter (2) through the A pipeline (4), and the full-automatic backwashing filter (2) is connected with the high-efficiency composite flow constructed wetland (3) through the B pipeline (5).

2. The high-efficiency composite flow constructed wetland system according to claim 1, wherein the grid regulating tank (1) comprises a grid well (6) and a hydrolysis acidification regulating tank (7), the grid well (6) is connected with the hydrolysis acidification regulating tank (7), an elastic three-dimensional filler (8) and a water inlet pump (9) are arranged in the hydrolysis acidification regulating tank (7), the water inlet pump (9) is connected with the A pipeline (4), and the A pipeline (4) is provided with an A valve (10).

3. The high-efficiency composite flow constructed wetland system according to claim 1, wherein the high-efficiency composite flow constructed wetland (3) comprises a vertical flow constructed wetland (11), a horizontal subsurface flow constructed wetland (12), a water outlet well (13) and a membrane inversion well (14), a water inlet channel (50) is arranged between the vertical flow constructed wetland (11) and the horizontal subsurface flow constructed wetland (12), the water inlet channel (50) is arranged on the side wall of the bottom of the vertical flow constructed wetland (11), the B pipeline (5) comprises an A water inlet branch pipe (15), a B water inlet branch pipe (16) and a backwashing pipeline (17), the A water inlet branch pipe (15) is provided with a B valve (18), the B water inlet branch pipe (16) is provided with a C valve (19), the backwashing pipeline (17) is provided with a D valve (20), the bottom of the water outlet well (13) is provided with a lift pump (21), the back washing pipeline (17) is connected with a lift pump (21).

4. The high-efficiency composite flow constructed wetland system according to claim 3, wherein the upper part of the vertical flow constructed wetland (11) is provided with an A water distribution perforated pipe (22), a plurality of A water distribution holes (23) are distributed on the A water distribution perforated pipe (22) at equal intervals, the aperture of the A water distribution holes (23) is 10mm, the lower part of the vertical flow constructed wetland (11) is provided with an A inverted film perforated pipe (24), a plurality of A inverted film holes (25) are distributed on the A inverted film perforated pipe (24) at equal intervals, and the aperture of the A inverted film holes (25) is 20 mm.

5. The high-efficiency composite flow constructed wetland system according to claim 3, wherein an A clapboard (26) and a B clapboard (27) are arranged in the horizontal subsurface flow constructed wetland (12), the left side of the A clapboard (26) is connected with the inner wall of the horizontal subsurface flow constructed wetland (12), the distance between the right side of the A clapboard (26) and the inner wall of the horizontal subsurface flow constructed wetland (12) is D1, the right side of the B clapboard (27) is connected with the inner wall of the horizontal subsurface flow constructed wetland (12), the distance between the left side of the B clapboard (27) and the inner wall of the horizontal subsurface flow constructed wetland (12) is D2, D1 is D2, the A clapboard (26) is arranged below the B clapboard (27), the water inlet channel (50) is arranged below the A clapboard (26), the water collecting perforated pipe (28) is arranged above the B clapboard (27), and the water collecting perforated pipe (28) is connected with the water outlet well (13), a plurality of water collecting holes (29) are distributed on the water collecting perforated pipe (28) at equal intervals, the aperture of each water collecting hole (29) is 15mm, a B water distribution perforated pipe (30) and a B film pouring perforated pipe (31) are arranged on the lower portion of the horizontal subsurface flow artificial wetland (12), the B water distribution perforated pipe (30) and the B film pouring perforated pipe (31) are uniformly arranged below the B partition plate (27), a plurality of B water distribution holes (32) are distributed on the B water distribution perforated pipe (30) at equal intervals, the aperture of the B water distribution holes (32) is 10mm, a plurality of B film pouring holes (33) are distributed on the B film pouring perforated pipe (31) at equal intervals, and the aperture of the B film pouring holes (33) is 20 mm.

6. The high-efficiency composite flow constructed wetland system according to claim 3, characterized in that a vertical flow wetland planting layer (34) is arranged in the vertical flow constructed wetland (11), a horizontal subsurface flow wetland planting layer (35) is arranged in the horizontal subsurface flow constructed wetland (12), the vertical flow wetland planting layer (34) is sequentially provided with a coarse sand layer (36) with the thickness of 100mm, a gravel layer (37) with the thickness of 500mm, a zeolite layer (38) with the thickness of 500mm, a coarse sand layer (36) with the thickness of 200mm and planting soil (39) with the thickness of 200mm from bottom to top, the horizontal subsurface flow planting layer (35) is sequentially provided with a coarse sand layer (36) with the thickness of 100mm, a blast furnace slag layer (40) with the thickness of 400mm, a dolomite layer (41) with the thickness of 400mm, a coarse sand layer (36) with the thickness of 200mm and planting soil (39) with the thickness of 200mm from bottom to top, a plurality of plants (42) are arranged on the planting soil (39) at equal intervals, the grain diameter of coarse sand in the coarse sand layer (36) is 0.9-1.2mm, the grain diameter of gravel in the gravel layer (37) is 80-120mm, the grain diameter of zeolite in the zeolite layer (38) is 20-60mm, the grain diameter of blast furnace slag in the blast furnace slag layer (40) is 80-120mm, and the grain diameter of dolomite in the dolomite layer (41) is 15-60 mm.

7. The high-efficiency composite flow constructed wetland system as claimed in claim 4, wherein the A water distribution perforated pipe (22) is connected with the A water inlet branch pipe (15), the A membrane inverting perforated pipe (24) is in pipeline connection with the membrane inverting well (14), and an E valve (43) is arranged on the pipe section between the A membrane inverting perforated pipe (24) and the membrane inverting well (14).

8. The constructed wetland system with high efficiency and composite flow as claimed in claim 5, wherein the water distribution perforated pipe (30) B is connected with the water inlet branch pipe (16) B, the membrane inverting perforated pipe (31) B is connected with the membrane inverting well (14) through a pipeline, and an F valve (44) is arranged on the pipe section between the membrane inverting perforated pipe (31) B and the membrane inverting well (14).

9. The high-efficiency composite flow constructed wetland system according to claim 5, wherein a G valve (45) is arranged on the pipe section between the water collection perforated pipe (28) and the water outlet well (13), a C pipe (46) and a D pipe (47) are arranged on the pipe section between the G valve (45) and the water collection perforated pipe (28), an H valve (48) is arranged on the C pipe (46), an I valve (49) is arranged on the D pipe (47), one end of the D pipe (47) is connected to the pipe section between the G valve (45) and the water collection perforated pipe (28), and the other end of the D pipe (47) is connected to the pipe section between the D valve (20) and the lift pump (21).

10. An implementation method of an efficient composite flow constructed wetland system is characterized by comprising the following steps:

s1, covering the polyethylene plastic film on the inner surface of the vertical flow artificial wetland (11) for anti-seepage treatment, and covering the polyethylene plastic film on the inner surface of the horizontal subsurface flow artificial wetland (12) for anti-seepage treatment;

s2, covering geotextile on the polyethylene plastic film;

s3, mounting the A water distribution perforated pipe (22) on the upper part of the vertical flow artificial wetland (11), mounting the A inverted film perforated pipe (24) on the lower part of the vertical flow artificial wetland (11), mounting the B water distribution perforated pipe (30) and the B inverted film perforated pipe (31) on the lower part of the horizontal subsurface flow artificial wetland (12), mounting the A clapboard (26) on the left side wall of the horizontal subsurface flow artificial wetland (12), mounting the B clapboard (27) on the right side wall of the horizontal subsurface flow artificial wetland (12), and mounting the water collection perforated pipe (28) above the B clapboard (27);

s4, paving a vertical flow wetland planting layer (34) in a vertical flow artificial wetland (11), paving a coarse sand layer (36) with the thickness of 100mm at the bottom of the vertical flow artificial wetland (11) and leveling, paving a gravel layer (37) with the thickness of 500mm and leveling, paving a zeolite layer (38) with the thickness of 500mm and leveling, paving a coarse sand layer (36) with the thickness of 200mm and leveling, paving planting soil (39) with the thickness of 200mm, leveling and compacting, and planting a plurality of plants (42) in the planting soil (39) at equal intervals;

s5, paving a horizontal subsurface flow wetland planting layer (35) in a horizontal subsurface flow constructed wetland (12), paving a coarse sand layer (36) with the thickness of 100mm at the bottom of the horizontal subsurface flow constructed wetland (12) and leveling, paving a blast furnace slag layer (40) with the thickness of 400mm and leveling, paving a dolomite layer (41) with the thickness of 400mm and leveling, paving a coarse sand layer (36) with the thickness of 200mm and leveling, paving planting soil (39) with the thickness of 200mm, leveling and compacting, and planting a plurality of plants (42) in the planting soil (39) at equal intervals;

s6, the sewage in the grid well (6) enters a hydrolytic acidification regulating tank (7) for hydrolytic acidification treatment, and the retention time is 3-5 h;

s7, opening the valve A (10), and conveying the sewage subjected to hydrolytic acidification treatment to the full-automatic backwashing filter (2) through the pipeline A (4) by the water inlet pump (9) for filtering treatment;

s8, opening a valve B (18), enabling the filtered sewage to enter a water distribution perforated pipe A (22) through a water inlet branch pipe A (15), enabling a water distribution hole A (23) to convey the filtered sewage to a vertical flow wetland planting layer (34), opening a valve C (19), enabling the filtered sewage to enter a water distribution perforated pipe B (30) through a water inlet branch pipe B (16), and enabling the water distribution hole A (23) to convey the filtered sewage to a horizontal subsurface flow wetland planting layer (35);

s9, sewage in the vertical flow artificial wetland (11) permeates from top to bottom through the vertical flow wetland planting layer (34), part of organic matters and SS are removed, and the sewage is completely nitrified, then enters the lower part of the horizontal subsurface flow artificial wetland (12) through the water inlet channel (50), is mixed with part of untreated sewage conveyed by the water inlet branch pipe (16) B, and then forms reciprocating flow through the partition plate A (26) and the partition plate B (27), so that an aerobic and anoxic environment is formed alternately, and denitrification of the sewage is realized. The removal effect on the phosphorus in the sewage is completed through the horizontal subsurface flow wetland planting layer (35). Finally, after the sewage is collected by the water collecting perforated pipe (28), opening a G valve (45) and an H valve (48) to enable the sewage after nitrogen and phosphorus removal to enter a water outlet well (13) for discharging;

s10, after the high-efficiency composite flow artificial wetland (3) runs for 60-75 days, dredging treatment is needed; closing the valve B (18) and the valve C (19), the valve G (45) and the valve H (48), simultaneously opening the valve D (20) and the valve I (49), closing a lift pump (21) in a water outlet well (13), the valve D (20) and the valve I (49) when the filler in the high-efficiency subsurface flow constructed wetland (3) is submerged by water inflow, and opening the valve E (43) and the valve F (44) in a water drainage well (14) for dredging treatment after the filler is fully infiltrated so as to ensure the smooth flow of water in the wetland;

and S11, after the flushing is finished, closing the valve E (43) and the valve F (44), and re-opening the water inlet pump (9) and the valve B (18) and the valve C (19) on the water inlet pipeline, so that the high-efficiency subsurface flow artificial wetland (3) can work normally.