CN213977143U - Anti-blocking type constructed wetland double-path water distribution system - Google Patents

Abstract

The utility model relates to an anti-blocking type constructed wetland two-way water distribution system, which comprises an constructed wetland unit, an overflow water distribution unit arranged in the constructed wetland unit, and a perforated water distribution unit arranged on the constructed wetland unit, wherein the system also comprises a back washing unit used for washing sediments in a pipeline, the back washing unit is connected with the overflow water distribution unit and the perforated water distribution unit, and the back washing unit comprises a pipeline component, a valve component arranged on the pipeline component and a back washing pump component; the system can ensure that the water distribution is smooth and free from blockage, the water distribution simultaneously generates a drop reoxygenation effect, the dissolved oxygen content of the inlet water is increased, the wetland treatment efficiency is improved, meanwhile, the water distribution mode is changed according to different water volumes of the inlet water, the flexible and rapid water distribution of the wetland is realized, the silted pipelines are effectively dredged, the service life of the water distribution system is prolonged, and the stable operation of the wetland is maintained.

Description

Anti-blocking type constructed wetland double-path water distribution system

Technical Field

The utility model relates to an artificial wetland technical field especially relates to have smooth and easy and reoxygenation of water distribution concurrently, diversified anti-blocking type artificial wetland double-circuit water distribution system of water distribution mode.

Background

The artificial wetland is a natural wetland comprehensive ecological treatment system which is formed by substrates, plants and microorganisms. When the artificial wetland operates, sewage is distributed to the filter material of the artificial wetland through the water distribution system of the wetland, and pollutants in the sewage are removed together through the functions of matrix adsorption, plant absorption and microbial transformation. As a sewage treatment technology, the artificial wetland has the advantages of high efficiency, low investment cost, simple facilities, small secondary pollution and the like. Meanwhile, with the leap-over progress of science and technology and the controversy and exploration of researchers, the artificial wetland technology is continuously optimized and perfected. At present, the artificial wetland is used as a mature sewage treatment technology and widely applied to treatment of domestic sewage, urban rainwater runoff, black and odorous river water, eutrophic water and other various sewages at home and abroad. However, when the artificial wetland adopts an unreasonable water distribution manner, the problems of blockage of a water distribution system, uneven water distribution and the like are caused, the water distribution efficiency is reduced, the treatment effect of the wetland is affected, and the stable operation of the wetland is difficult to maintain.

The existing artificial wetland distributes water to the wetland by laying a perforated pipeline, arranging an overflow weir or a water distribution tank or adopting a water inlet end to distribute water and the like. However, when the perforated pipeline is used for water distribution, the aperture of the water distribution hole is small, so that the hole is easily blocked by silt, suspended particles and wetland weeds in sewage, the water distribution efficiency is reduced, and even the water distribution process is interrupted, so that the operation of a wetland system is influenced; when water is distributed by adopting an overflow weir or a water distribution groove, the water passing channel is wide, so that the water flow entering the wetland is too gentle, and the height between a weir crest and a notch from the surface of the wetland is limited, so that the contact area of sewage and air is small, and the effective water drop reoxygenation effect cannot be generated; when water is distributed at the water inlet end, sewage is distributed on the surface of the wetland from the water inlet and enters the wetland along the length direction or the width direction of the wetland in a diffused manner, the water distribution is not uniform, the amount of the sewage distributed on a filter material of the wetland is unbalanced, short flow and dead zone phenomena exist in the wetland, and the treatment efficiency of the artificial wetland is influenced. Meanwhile, the water distribution system of the conventional artificial wetland is single, and the solidification phenomenon exists in the water distribution mode, so that the water cannot be flexibly distributed according to different water volumes.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem that above-mentioned prior art exists, a water distribution is smooth and easy not have the jam, diversified reoxygenation formula of water distribution mode prevents stifled type constructed wetland double-circuit water distribution system.

In order to achieve the purpose, the method can be realized by the following technical scheme:

the utility model provides an anti-blocking type constructed wetland double-circuit water distribution system, is in including constructed wetland unit, setting overflow water distribution unit, the setting in the constructed wetland unit are in perforation water distribution unit on the constructed wetland unit, the system is still including the back flush unit that is used for the interior sediment of flushing line, the back flush unit with overflow water distribution unit, perforation water distribution unit connection, the back flush unit is including pipeline assembly, valve member and the back flush pump subassembly of setting on pipeline assembly.

More specifically, the overflow water distribution unit includes an overflow water inlet pipe, an overflow water distribution pump disposed at one end of the overflow water inlet pipe, an overflow water distribution valve and an overflow water distribution main pipe disposed on the overflow water inlet pipe, a plurality of overflow water distribution branch pipes disposed on the overflow water distribution main pipe, and a plurality of overflow pipes disposed on the overflow water distribution branch pipes.

Further specifically, a plurality of flow guide caps are arranged on the overflow pipes, the flow guide caps are horn-shaped, and the horn openings are far away from the overflow pipes.

More specifically, a plurality of rectangular diversion grooves are formed in the inner side of the diversion cap, and extend from the bottom of the diversion cap to the top of the diversion cap.

More specifically, the included angle between the bell mouth and the vertical direction is 15-45 degrees.

More specifically, the overflow pipe protrudes from the artificial wetland unit by 0.6m to 1 m.

More specifically, the perforated water distribution unit comprises a perforated water inlet pipe, a perforated water distribution pump arranged at one end of the perforated water inlet pipe, a perforated water distribution valve and a perforated water distribution main pipe which are arranged on the perforated water inlet pipe, and a plurality of perforated water distribution branch pipes arranged on the perforated water distribution main pipe, wherein holes are uniformly formed in the plurality of perforated water distribution branch pipes.

More specifically, the pipeline assembly comprises a back-flushing water inlet pipe and a back-flushing pipe connected with the back-flushing water inlet pipe, and the back-flushing pipe is arranged at the tail ends of the perforated water distribution branch pipes and is communicated with the perforated water distribution branch pipes; the valve component comprises a back washing valve arranged on the back washing water inlet pipe; the back washing pump assembly comprises a back washing pump arranged at one end of the back washing water inlet pipe.

Further specifically, the pipeline assembly comprises a transverse overflow pipe, a first communicating pipe arranged on the transverse overflow pipe and a back flushing pipe arranged on the first communicating pipe, and the valve assembly comprises a first communicating valve arranged on the first communicating pipe.

Further specifically, the pipeline assembly comprises a backwashing straight pipe arranged on the overflow water inlet pipe, a second communicating pipe arranged on the backwashing straight pipe, and a backwashing pipe arranged on the second communicating pipe, and the valve assembly comprises a backwashing water inlet valve arranged on the backwashing straight pipe and a second communicating valve arranged on the second communicating pipe.

The utility model has the advantages that: the water distribution is smooth and free from blockage, the water distribution simultaneously generates a drop reoxygenation effect, the dissolved oxygen amount of the inlet water is increased, and the wetland treatment efficiency is improved; a two-way water distribution system is arranged, and the water distribution mode is changed according to different water flows, so that flexible and rapid water distribution of the wetland is realized; the water distribution system is connected with a back-flushing facility, so that the siltation pipelines are effectively dredged, the service life of the water distribution system is prolonged, and the stable operation of the wetland is maintained.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic plan view of embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of embodiment 2 of the present invention;

fig. 4 is a schematic plan view of embodiment 2 of the present invention;

fig. 5 is a schematic structural diagram of embodiment 3 of the present invention;

fig. 6 is a schematic plan view of embodiment 3 of the present invention;

fig. 7 is a schematic plan view of the deflector cap of the present invention;

in the figure: 1. overflowing and distributing a water pump; 2. an overflow water inlet pipe; 3. a back-flushing valve; 4. an overflow water distribution valve; 5. a perforated cloth water pump; 6. a perforated water distribution valve; 7. a perforated water inlet pipe; 8. perforating a water distribution main pipe; 9. perforating a water distribution branch pipe; 10. a backwash pump; 11. an overflow water distribution branch pipe; 12. an overflow water distribution main pipe; 13. an overflow pipe; 14. a flow guide cap; 15. the direction of the water flow; 16. artificial wetland; 17. a wetland wall; 18. backwashing the water inlet pipe; 19. a backwash pipe; 20. a reducing tee; 21. filtering the wetland material; 22. a transverse overflow pipe; 23. a first communication valve; 24. a first communication pipe; 25. backwashing the water inlet valve; 26. backwashing the straight pipe; 27. a second communication valve; 28. a second communicating pipe; 29. and a diversion trench.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

In order to solve the above technical problems, as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the present invention is implemented by the following technical solutions:

an anti-blocking type constructed wetland two-way water distribution system is shown in figures 1 and 2 and comprises an constructed wetland unit, an overflow water distribution unit arranged in the constructed wetland unit, a perforated water distribution unit arranged on the constructed wetland unit and a backwashing unit used for flushing sediments in a pipeline, wherein the backwashing unit is connected with the overflow water distribution unit and the perforated water distribution unit and comprises a pipeline assembly, a valve assembly arranged on the pipeline assembly and a backwashing pump assembly; the overflow water distribution unit comprises an overflow water inlet pipe 2, an overflow water distribution pump 1 arranged at one end of the overflow water inlet pipe 2, an overflow water distribution valve 4 and an overflow water distribution main pipe 12 which are arranged on the overflow water inlet pipe 2, a plurality of overflow water distribution branch pipes 11 arranged on the overflow water distribution main pipe 12 and a plurality of overflow pipes 13 arranged on the overflow water distribution branch pipes 11; the perforation water distribution unit comprises a perforation water inlet pipe 7, a perforation water distribution pump 5 arranged at one end of the perforation water inlet pipe 7, a perforation water distribution valve 6 and a perforation water distribution main pipe 8 which are arranged on the perforation water inlet pipe 7, and a plurality of perforation water distribution branch pipes 9 arranged on the perforation water distribution main pipe 8, wherein holes are uniformly formed on the plurality of perforation water distribution branch pipes 9.

As shown in fig. 1, 2 and 7, the overflow water distribution unit provides power for water distribution through an overflow water distribution pump 1 arranged outside the wetland, sewage is pumped by the overflow water distribution pump 1 and then is conveyed by an overflow water inlet pipe 2, and the water delivery process is controlled through an overflow water distribution valve 4 arranged on the overflow water inlet pipe 2; the sewage is conveyed by the overflow water inlet pipe 2 and then enters an overflow water distribution main pipe 12 connected with the overflow water inlet pipe, and 1 overflow water distribution main pipe 12 is arranged, laid on the inner side of a wetland wall 17 on the left side of the artificial wetland 16 and arranged in parallel along the short side of the artificial wetland 16; the overflow water distribution main pipe 12 is connected with a plurality of overflow water distribution branch pipes 11 and is arranged in parallel along the long edge of the artificial wetland 16, and the specific number of the overflow water distribution branch pipes 11 is calculated according to the design scale of the wetland; the overflow water distribution main pipe 12 and the overflow water distribution branch pipe 11 are buried at a position 0.1-0.3 m below the surface of a wetland filter material 21, the wetland filter material 21 fixes the overflow water distribution main pipe 12 and the overflow water distribution branch pipe 11 in the wetland unit, and a certain heat preservation effect is achieved in winter to prevent a water distribution pipeline from frost cracking; a plurality of overflow pipes 13 are uniformly arranged on the overflow water distribution branch pipe 11, the overflow pipes 13 are vertical pipes and are connected with the overflow water distribution branch pipe 11 through reducing tee joints 20, the height of the overflow pipes 13 is kept between 0.6m and 1m with the surface of the wetland, the atmosphere is ensured to be fully contacted with sewage during water distribution, and an effective water drop reoxygenation effect is generated; a horn-shaped diversion cap 14 is arranged on the opening of the overflow pipe 13, the horn mouth is far away from the overflow pipe 13, and the included angle between the horn mouth and the vertical direction is 15-45 degrees; the inner side of the diversion cap 14 is provided with a rectangular diversion trench 29 which extends from the bottom of the diversion cap 14 to the cap opening. When the overflow water distribution unit distributes water, sewage enters a plurality of overflow water distribution branch pipes 11 along the length direction of the overflow water distribution main pipe 12, then overflows from a plurality of overflow pipes 13 on the overflow water distribution branch pipes 11, and after passing through a flow guide cap 14 with a flow guide groove 29 arranged on the opening of the overflow pipe 13, the sewage is dispersed into a plurality of radial thin flows, the thin flows are sprayed to the periphery along the cap opening of the horn-shaped flow guide cap 14 under the action of water pressure, the water flow direction 15 is in a fountain shape, the water distribution is more uniform, meanwhile, the contact area of the sewage and the atmosphere is increased, and the reoxygenation is more facilitated.

As shown in fig. 1 and 2, the perforated water distribution unit is laid on the upper part of the wetland filter material 21, a perforated water distribution pump 5 provides water distribution power for the unit, sewage is conveyed by the perforated water distribution pump 5 and enters a perforated water inlet pipe 7 connected with the unit, and a perforated water distribution valve 6 is arranged on the perforated water inlet pipe 7; when the perforated water distribution valve 6 is opened, sewage enters the perforated water distribution main pipe 8 connected with the perforated water inlet pipe 7 through the perforated water inlet pipe 7, and 1 perforated water distribution main pipe 8 is arranged, is close to a left wetland wall 17 of the artificial wetland 16 and is laid in parallel along the short side of the artificial wetland 16; the main perforated water distribution pipe 8 is connected with a plurality of perforated water distribution branch pipes 9, the perforated water distribution branch pipes 9 are laid in parallel along the long edge of the artificial wetland 16 and are arranged in a staggered way on the plane with a plurality of overflow water distribution branch pipes 11 below the surface of the wetland filter material 21 so as to prevent dead zones from occurring during water distribution; the plurality of perforated water distribution branch pipes 9 are uniformly perforated, so that the water distribution uniformity is improved, and the specific number of the perforated water distribution branch pipes 9 is calculated according to the design scale of the wetland. When the sewage is distributed by the perforation water distribution unit, the perforation water distribution main pipe 8 distributes the sewage to the perforation water distribution branch pipes 9, and the sewage enters the perforation water distribution branch pipes 9 and then enters the wetland along the uniform orifices on the branch pipes to complete the water distribution process.

When the water distribution unit distributes water to the wetland, the water distribution velocity of flow reduces along water distribution pipeline length direction gradually, and the particulate matter easily deposits, silts at the latter half section of water distribution pipeline in the sewage, leads to water distribution pipeline to block up, reduces water distribution efficiency. Therefore, a backwashing unit is arranged in the wetland unit, the backwashing unit comprises three structures, namely a structure 1, a structure 2 and a structure 3, the structure 1 corresponds to the embodiment 1 and comprises the figures 1 and 2, the structure 2 corresponds to the embodiment 2 and comprises the figures 3 and 4, and the structure 3 corresponds to the embodiment 3 and comprises the figures 5 and 6.

Example 1

As shown in fig. 1 and 2, the pipeline assembly includes a backwash water inlet pipe 18 and a backwash pipe 19 connected to the backwash water inlet pipe 18, the valve assembly includes a backwash valve 3 disposed on the backwash water inlet pipe 18, the backwash pump assembly includes a backwash pump 10 disposed at one end of the backwash water inlet pipe 18, the backwash pipe 19 is connected to the ends of the plurality of perforated water distribution branch pipes 9 of the perforated water distribution unit and is communicated with all of the perforated water distribution branch pipes 9, the backwash unit is provided with backwash power by the backwash pump 10, backwash water of the backwash unit is clean water treated by the wetland unit, and the backwash water is purified and discharged through the wetland filter material 21 after washing the perforated water distribution unit. Example 1 is applicable to the case that the SS (suspended matter) concentration of the wetland unit inlet water is high.

When the device is in specific operation, the perforated water distribution valve 6 is closed, the backwashing valve 3 and the backwashing pump 10 are opened at the same time, backwashing water enters the backwashing pipe 19 from the backwashing water inlet pipe 18, then the water distribution pipeline is flushed in the reverse direction along the water distribution of the perforated water distribution branch pipe 9, so that the pipeline sludge at the rear half section of the perforated water distribution branch pipe 9 is fully flushed and smashed by the backwashing water until the sludge is stripped from the inner wall of the pipeline under the pushing action of backwashing water flow, and at the moment, the backwashing of the perforated water distribution unit is completed.

Example 2

As shown in fig. 3 and 4, the pipe assembly includes a horizontal overflow pipe 22, a first communication pipe 24 disposed on the horizontal overflow pipe 22, and a backwash pipe 19 disposed on the first communication pipe 24, and the valve assembly includes a first communication valve 23 disposed on the first communication pipe 24, in this embodiment, the backwash pump assembly is an overflow distribution pump 1, the backwash unit is provided with backwash power by the overflow distribution pump 1, backwash water of the backwash unit adopts inlet water of the wetland unit, and the backwash water flushes the perforated distribution unit and is purified and discharged by a wetland filter material 21. Embodiment 2 is suitable for the case that the wetland unit inlet water SS (suspended solid) concentration is low and the water distribution pressure of the overflow water distribution unit meets the requirements of overflow water distribution and backwashing at the same time.

When the device is in specific operation, the perforated water distribution valve 6 is closed, the overflow water distribution pump 1, the overflow water distribution valve 4 and the first communication valve 23 are opened at the same time, backwash water enters the plurality of overflow water distribution branch pipes 11 from the overflow water distribution main pipe 12, enters the overflow transverse pipe 22 and the first communication pipe 24 connected with the overflow transverse pipe 11 through the overflow water distribution branch pipes 11, then enters the backwash pipe 19 through the first communication pipe 24, and finally washes the water distribution pipeline along the water distribution reverse direction of the perforated water distribution branch pipes 9, so that pipeline sludge at the rear half section of the perforated water distribution branch pipes 9 is fully washed and smashed by the backwash water until the pipeline sludge is stripped from the inner wall of the pipeline under the pushing action of backwash water, and then the backwash on the perforated water distribution unit is completed.

Example 3

As shown in fig. 5 and 6, the pipeline assembly includes a backwash straight pipe 26 disposed on the overflow water inlet pipe 2, a second communicating pipe 28 disposed on the backwash straight pipe 26, and a backwash pipe 19 disposed on the second communicating pipe 28, the valve assembly includes a backwash water inlet valve 25 disposed on the backwash straight pipe 26, and a second communicating valve 27 disposed on the second communicating pipe 28, in this embodiment, the backwash pump assembly is an overflow water distribution pump 1, the backwash unit is provided with backwash power by the overflow water distribution pump 1, backwash water of the backwash unit adopts inlet water of the wetland unit, and the backwash water flushes the perforated water distribution unit, and is purified and discharged through the wetland filter material 21. Embodiment 3 is suitable for the case that the wetland unit inlet water SS (suspended solid) concentration is low and the water distribution pressure of the overflow water distribution unit can not meet the requirements of overflow water distribution and backwashing at the same time.

When the device is in specific operation, the perforated water distribution valve 6 and the overflow water distribution valve 4 are closed, the overflow water distribution pump 1, the backwashing water inlet valve 25 and the second communication valve 27 are opened at the same time, backwashing water enters the backwashing straight pipe 26 and the second communication pipe 28 from the overflow water inlet pipe 2, then enters the backwashing pipe 19 through the second communication pipe 28, and finally washes the water distribution pipeline along the water distribution reverse direction of the perforated water distribution branch pipe 9, so that the pipeline sludge at the rear half section of the perforated water distribution branch pipe 9 is fully washed and crushed by the backwashing water until the pipeline sludge is stripped from the inner wall of the pipeline under the pushing action of the backwashing water flow, and at this time, the backwashing on the perforated water distribution unit is completed.

As shown in fig. 1, 2, 3, 4, 5 and 6, when the wetland unit distributes water, in embodiment 1, the backwash valve 3 and the backwash pump 10 are closed, in embodiment 2, the first communication valve 23 is closed, in embodiment 3, the backwash water inlet valve 25 and the second communication valve 27 are closed, and the two-way water distribution system composed of the overflow water distribution unit and the perforated water distribution unit changes the corresponding water distribution mode according to the difference of the water inflow amount, and opens the water distribution equipment of the corresponding water distribution unit. When the inflow water quantity of the wetland is Q_{Running water}Smaller than the design load Q of the wetland unit_{Design of}One half time of (i.e. Q)_{Running water}<50％Q_{Design of}When the water distribution mode is a small water distribution mode, the overflow water distribution pump 1 and the overflow water distribution valve 4 are closed, the perforated water distribution pump 5 and the perforated water distribution valve 6 are opened, the perforated water distribution unit performs intermittent water distribution on the wetland unit, and the single water distribution time length and the interval time length are calculated according to the water inlet pollution load; when the water volume of the wetland water inflow is within the design load of the wetland unit, namely 50 percent Q_{Design of}≤Q_{Running water}<Q_{Design of}When the water distribution mode is a normal water distribution mode, the overflow water distribution pump 1 and the perforated water distribution pump 5 and the corresponding overflow water distribution valve 4 and the perforated water distribution valve 6 are alternately opened, the overflow water distribution unit and the perforated water distribution unit alternately and intermittently distribute water to the wetland units, and the water distribution duration and interval duration of each water distribution unit are calculated according to the water inlet pollution load condition; when the water volume of the wetland incoming water is slightly larger than the design load of the wetland unit, namely Q_{Design of}≤Q_{Running water}<150％Q_{Design of}In the large water quantity water distribution mode, the perforated water distribution pump 5 and the perforated water distribution valve 6 are closed, the overflow water distribution pump 1 and the overflow water distribution valve 4 are opened, and the overflow water distribution unit is adopted to feed water into the wetland unitPerforming intermittent water distribution, wherein the time length of single water distribution and the time interval are calculated according to the pollution load of inlet water; when the water volume of the wetland water is larger, namely 150 percent Q_{Design of}≤Q_{Running water}And in the process, the water distribution mode is an ultra-high water distribution mode, the overflow water distribution pump 1, the overflow water distribution valve 4, the perforated water distribution pump 5 and the perforated water distribution valve 6 are simultaneously opened, the overflow water distribution unit and the perforated water distribution unit jointly distribute water for the wetland unit, an intermittent water distribution mode is adopted, and water distribution parameters are calculated according to the inflow pollution load.

In conclusion, through the system, the constructed wetland can smoothly distribute water, the water distribution system is effectively prevented from being blocked, the service life of the water distribution system is prolonged, the dissolved oxygen concentration of inlet water of the wetland is improved, the purification effect of the wetland is enhanced, the water distribution mode can be flexibly changed according to the water quantity of the inlet water, the water distribution time is shortened, and the rapid and economical water distribution is realized.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an anti-blocking type constructed wetland double-circuit water distribution system, is in including constructed wetland unit, setting overflow water distribution unit, the setting in the constructed wetland unit are in perforation water distribution unit on the constructed wetland unit, its characterized in that: the system also comprises a backwashing unit used for flushing the sediments in the pipeline, the backwashing unit is connected with the overflow water distribution unit and the perforated water distribution unit, and the backwashing unit comprises a pipeline assembly, a valve assembly arranged on the pipeline assembly and a backwashing pump assembly.

2. The anti-blocking type constructed wetland two-way water distribution system according to claim 1, characterized in that: the overflow water distribution unit comprises an overflow water inlet pipe (2), an overflow water distribution pump (1) arranged at one end of the overflow water inlet pipe (2), an overflow water distribution valve (4) and an overflow water distribution main pipe (12) which are arranged on the overflow water inlet pipe (2), a plurality of overflow water distribution branch pipes (11) arranged on the overflow water distribution main pipe (12) and a plurality of overflow pipes (13) arranged on the overflow water distribution branch pipes (11).

3. The anti-blocking type constructed wetland two-way water distribution system of claim 2, which is characterized in that: a plurality of flow guide caps (14) are arranged on the overflow pipes (13), the flow guide caps (14) are in a horn shape, and the horn mouth is far away from the overflow pipes (13).

4. The anti-blocking type constructed wetland two-way water distribution system according to claim 3, characterized in that: the inner side of the diversion cap (14) is provided with a plurality of rectangular diversion trenches (29), and the diversion trenches (29) extend from the bottom of the diversion cap (14) to the top of the diversion cap (14).

5. The anti-blocking type constructed wetland two-way water distribution system according to claim 4, characterized in that: the included angle between the bell mouth and the vertical direction is 15-45 degrees.

6. The anti-blocking type constructed wetland two-way water distribution system of claim 2, which is characterized in that: the overflow pipe (13) protrudes out of the artificial wetland unit by 0.6-1 m.

7. The anti-blocking type constructed wetland two-way water distribution system according to claim 1, characterized in that: the perforation water distribution unit comprises a perforation water inlet pipe (7), a perforation water distribution pump (5) arranged at one end of the perforation water inlet pipe (7), a perforation water distribution valve (6) arranged on the perforation water inlet pipe (7), a perforation water distribution main pipe (8), and a plurality of perforation water distribution branch pipes (9) arranged on the perforation water distribution main pipe (8), wherein the perforation water distribution branch pipes (9) are uniformly opened.

8. The anti-blocking type constructed wetland two-way water distribution system according to claim 7, characterized in that: the pipeline assembly comprises a back-flushing water inlet pipe (18) and a back-flushing pipe (19) connected with the back-flushing water inlet pipe (18), and the back-flushing pipe (19) is arranged at the tail end of the plurality of perforated water distribution branch pipes (9) and is communicated with the plurality of perforated water distribution branch pipes (9); the valve assembly comprises a back washing valve (3) arranged on the back washing water inlet pipe (18); the back washing pump assembly comprises a back washing pump (10) arranged at one end of the back washing water inlet pipe (18).

9. The anti-blocking type constructed wetland two-way water distribution system according to claim 7, characterized in that: the pipeline assembly comprises a transverse overflow pipe (22), a first communicating pipe (24) arranged on the transverse overflow pipe (22) and a back flushing pipe (19) arranged on the first communicating pipe (24), and the valve assembly comprises a first communicating valve (23) arranged on the first communicating pipe (24).

10. The anti-blocking type constructed wetland two-way water distribution system of claim 2, which is characterized in that: the pipeline assembly comprises a back flush straight pipe (26) arranged on the overflow water inlet pipe (2), a second communicating pipe (28) arranged on the back flush straight pipe (26), and a back flush pipe (19) arranged on the second communicating pipe (28), and the valve assembly comprises a back flush water inlet valve (25) arranged on the back flush straight pipe (26) and a second communicating valve (27) arranged on the second communicating pipe (28).

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