Bidirectional self-cleaning anti-blocking horizontal subsurface flow constructed wetland

Abstract

The utility model discloses a bidirectional self-cleaning anti-blocking horizontal subsurface flow constructed wetland which comprises a wetland pool, a first communicating pipe and a second communicating pipe are respectively arranged on two sides of the upper part of the wetland pool, one end of the first communicating pipe is respectively connected with a first water inlet pipe and a first water outlet pipe, and the other end of the first communicating pipe is connected with a first water collecting and distributing pipe; one end of the second communicating pipe is respectively connected with the second water inlet pipe and the second water outlet pipe; the first water inlet pipe and the second water inlet pipe are connected with a water inlet main pipe positioned on one side of the wetland pool, and the first water outlet pipe and the second water outlet pipe are connected with a water outlet main pipe positioned on the other side of the wetland pool; the wetland pool is divided into a left wetland unit and a right wetland unit by a partition wall, and fillers are arranged in the two wetland units. According to the bidirectional self-cleaning anti-blocking horizontal subsurface flow constructed wetland disclosed by the utility model, the blocking occurrence rate of the wetland is effectively reduced and the service life of the wetland is prolonged by regularly changing the direction of water flow in the wetland, so that a wetland system continuously, efficiently and stably runs.

Description

Technical Field

[0001] The utility model relates to the technical field of artificial wetlands, in particular to a bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland. Background Art

[0002] Constructed wetlands are a common sewage treatment process system. Horizontal subsurface flow constructed wetlands are a common form of artificial wetlands. Polluted water flows horizontally through the artificial wetland system composed of substrates, aquatic plants, and microorganisms, and the water quality purification process is achieved through the synergistic effects of physics, chemistry, and biology. It has the characteristics of good pollutant removal effect, low infrastructure investment cost, convenient operation and management, low operating cost, and good landscape effect. It is currently widely used in the purification of secondary effluent from sewage treatment plants, slightly polluted river water, and similar polluted water bodies.

[0003] After the construction of the horizontal subsurface flow wetland, good operation and maintenance are crucial to ensure that the water quality meets the discharge standards. The clogging of the filler inside the wetland is one of the key factors affecting the operation effect of the wetland and is a major challenge faced by the application of horizontal subsurface flow wetlands. With the increase of operation time, the suspended matter intercepted by the bed gradually increases. In addition, the plant roots and overgrown microorganisms lead to a decrease in the porosity of the filler and a decrease in the hydraulic conductivity coefficient, which causes the filler to be clogged, affecting the wetland's treatment effect on sewage. Therefore, preventing the clogging of the filler is extremely important for the purification effect of water pollutants.

[0004] At present, the anti-clogging technology of horizontal subsurface flow artificial wetlands mainly focuses on backwashing and replacement of fillers after clogging, and reducing plant planting density. The former is difficult to promote and apply due to cumbersome operation and high cost, and the latter often affects the treatment effect. Therefore, it is of great practical significance to study an anti-clogging horizontal potential artificial wetland that is easy to operate and does not increase the cost and maintenance costs. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical problems and to propose a bidirectional self-cleaning and anti-clogging horizontal submerged flow artificial wetland to solve the problems of frequent clogging of fillers in existing horizontal submerged flow artificial wetlands, complex flushing and replacement operations and high costs.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland, comprising a wetland pool, wherein a first connecting pipe and a second connecting pipe are respectively arranged on both sides of the upper part of the wetland pool, one end of the first connecting pipe is respectively connected to a first water inlet pipe and a first water outlet pipe, and the other end is connected to a first water collecting and distributing pipe; one end of the second connecting pipe is respectively connected to a second water inlet pipe and a second water outlet pipe, and the other end is connected to a second water collecting and distributing pipe;

[0008] The first water inlet pipe and the second water inlet pipe are connected to the water inlet main pipe located on one side of the wetland pool, and the first water outlet pipe and the second water outlet pipe are connected to the water outlet main pipe located on the other side of the wetland pool; the wetland pool is divided into two wetland units, left and right, by a partition wall, and fillers are arranged inside the two wetland units.

[0009] As a preferred embodiment, the first water inlet pipe and the second water inlet pipe are respectively provided with a first water inlet control valve and a second water inlet control valve; the first water outlet pipe and the second water outlet pipe are respectively provided with a first water outlet control valve and a second water outlet control valve, and piers are provided below the first water inlet control valve, the second water inlet control valve, the first water outlet control valve and the second water outlet control valve.

[0010] As a preferred embodiment, central axes of the first water inlet pipe, the second water inlet pipe, the first water outlet pipe, the second water outlet pipe, the first connecting pipe, the second connecting pipe, the first collecting and distributing pipe, and the second collecting and distributing pipe are all located in the same horizontal plane.

[0011] As a preferred embodiment, a plurality of connecting holes are provided at the bottom of the partition wall.

[0012] As a preferred embodiment, a vent pipe is provided at the bottom of the left and right wetland units of the wetland pool, a vent control valve is provided on the vent pipe, and a pier is provided below the vent control valve.

[0013] As a preferred embodiment, the filler in each wetland unit includes water collection and distribution area fillers arranged at both ends and main area fillers arranged in the middle, and the main area fillers include planting layer fillers and main layer fillers from top to bottom, and the first water collection and distribution pipe and the second water collection and distribution pipe are both arranged above the inside of the water collection and distribution area fillers.

[0014] As a preferred embodiment, the planting layer filler is limestone with a particle size of 8-12 mm and a thickness of 200-300 mm; the main layer filler is one or any combination of limestone, expanded clay, zeolite and volcanic rock with a particle size of 15-25 mm and a thickness of 800-1200 mm; the water collection and distribution area filler is limestone with a particle size of 50-70 mm and a thickness of 1000-1500 mm, and the total width of the water collection and distribution area filler in the horizontal direction from left to right is 1000-1500 mm.

[0015] As a preferred embodiment, emergent plants are planted on the upper part of the planting layer filler.

[0016] As a preferred embodiment, the emergent plants include one or any combination of cattail, reed, canna, juniper or rush, with a planting density of 12-20 plants / m 2 .

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] Firstly, the bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model effectively reduces the risk of clogging of the subsurface flow wetland, prolongs the service life of the wetland, improves the operation stability, and enhances the pollutant removal effect.

[0019] Secondly, the bidirectional self-cleaning and anti-clogging horizontal submerged flow artificial wetland of the utility model periodically reverses the direction of water flow, so that the sediments attached to the surface of the filler and trapped in the gaps are loosened and discharged with the water flow, and the filler is backwashed while water is entering, without adding extra operation and maintenance costs.

[0020] Thirdly, the wetland pool of the bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model is divided into left and right wetland units by a central partition wall. The two wetland units realize water flow communication and water redistribution through the connecting holes arranged at the bottom of the partition wall, which effectively avoids wetland short circuit and gives full play to the wetland function.

[0021] Fourthly, the bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model has a simple structure, low infrastructure cost and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the AA section structure along the middle;

[0024] Figure 3 for Figure 1 Schematic diagram of the BB section structure along the middle;

[0025] In the figure: 1-wetland pool; 2-water inlet main pipe; 3-first water inlet pipe; 4-second water inlet pipe; 5-first water outlet pipe; 6-second water outlet pipe; 7-first water inlet control valve; 8-second water inlet control valve; 9-first water outlet control valve; 10-second water outlet control valve; 11-first water collecting and distributing pipe; 12-second water collecting and distributing pipe; 13-connecting hole; 14-drain pipe; 15-drain control valve; 16-water outlet main pipe; 17-first connecting pipe; 18-second connecting pipe; 19-filler; 191-planting layer filler; 192-main layer filler; 193-water collecting and distributing area filler; 20-partition wall; 21-emergent plants. DETAILED DESCRIPTION

[0026] The following is a detailed description of the implementation of the present invention in conjunction with implementation cases, but they do not constitute a limitation of the present invention and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] like Figure 1-3 As shown, a bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland includes a wetland pool 1, a first connecting pipe 17 and a second connecting pipe 18 respectively arranged on the left and right sides of the upper part of the wetland pool 1, the left end of the first connecting pipe 17 is connected to the first water inlet pipe 3 and the first water outlet pipe 5, and the right end is connected to the first collecting and distributing pipe 11, the right end of the second connecting pipe 18 is connected to the second water inlet pipe 4 and the second water outlet pipe 6, and the left end is connected to the second collecting and distributing pipe 12, the first water inlet pipe 3 and the second water inlet pipe 4 are connected to the water inlet main pipe 2 located on one side of the wetland, the first water outlet pipe 5 and the second water outlet pipe 6 are connected to the water outlet main pipe 16 located on the other side of the wetland, and the wetland pool 1 is divided into left and right wetland units by a partition wall 20, and fillers 19 are arranged inside the two wetland units.

[0029] In one embodiment of the utility model, a plurality of connecting holes 13 are provided at the bottom of the partition wall 20. The connecting holes are 200 mm wide and 200 mm high, and the center distance between adjacent holes is 2 m.

[0030] In one embodiment of the utility model, the diameters of the first water inlet pipe 3 and the second water inlet pipe 4 are both 300 mm, and the first water inlet control valve 7 and the second water inlet control valve 8 are respectively provided thereon. The diameters of the first water outlet pipe 5 and the second water outlet pipe 6 are both 300 mm, and the first water outlet control valve 9 and the second water outlet control valve 10 are respectively provided thereon. Piers are provided under the valves, and each valve can be a manual valve or an electric valve.

[0031] In one embodiment of the utility model, the central axes of the first water inlet pipe 3, the second water inlet pipe 4, the first water outlet pipe 5, the second water outlet pipe 6, the first connecting pipe 17, the second connecting pipe 18, the first collecting and distributing pipe 11 and the second collecting and distributing pipe 12 are all located in the same horizontal plane.

[0032] In one embodiment of the utility model, a drain pipe 14 is provided at the bottom of the left and right wetland units of the wetland pool 1, and the pipe diameter is 300 mm. A drain control valve 15 is provided thereon, and piers are provided under the valves. By closing the first water inlet control valve 7 and the second water inlet control valve 8 and opening the drain control valve 15 at the same time, the wetland bed can be emptied, which is convenient for bed reoxygenation, maintenance, etc.

[0033] In one embodiment of the utility model, the filler 19 in each wetland unit includes a water collection and distribution area filler 193 arranged at both ends and a main area filler arranged in the middle. The main area filler includes a planting layer filler 191 and a main layer filler 192 from top to bottom. The first water collection and distribution pipe 11 and the second water collection and distribution pipe 12 are both arranged above the inside of the water collection and distribution area filler 193.

[0034] In one embodiment of the present utility model, the first water collecting and distributing pipe 11 and the second water collecting and distributing pipe 12 are perforated pipes, the pipe diameter is 300 mm, and the perforation hole diameter is 10-15 mm.

[0035] In one embodiment of the utility model, the planting layer filler 191 is limestone with a particle size of 8-12 mm and a thickness of 200-300 mm, the main layer filler 192 is one or any combination of limestone, expanded clay, zeolite and volcanic rock with a particle size of 15-25 mm and a thickness of 800-1200 mm, the water collection and distribution area filler 193 is limestone with a particle size of 50-70 mm and a thickness of 1000-1500 mm, and the total width of the water collection and distribution area filler from left to right in the horizontal direction is 1000-1500 mm.

[0036] In one embodiment of the present invention, the upper part of the planting layer filler 191 is planted with emergent plants 21, which include one or any combination of cattail, reed, canna, juniper or rush, and the planting density is 12-20 plants / m 2 .

[0037] The first operation mode of the bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model:

[0038] Open the first water inlet control valve 7 and the second water outlet control valve 10, and close the second water inlet control valve 8 and the first water outlet control valve 9 at the same time. At this time, the first water collecting and distributing pipe 11 serves as a water distribution pipe, and the second water collecting and distributing pipe 12 serves as a water collecting pipe. The incoming water enters the first connecting pipe 17 through the first water inlet pipe 3, and then enters the left wetland unit evenly through the first water collecting and distributing pipe 11. The water passes through the packing layer from left to right, enters the right wetland unit through the connecting hole 13, and finally enters the second water outlet pipe 6 through the second water collecting and distributing pipe 12 and the second connecting pipe 18. In this process, the water is purified.

[0039] The second operation mode of the bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland of the utility model:

[0040] Open the second water inlet control valve 8 and the first water outlet control valve 9, and close the first water inlet control valve 7 and the second water outlet control valve 10 at the same time. At this time, the second water collecting and distributing pipe 12 serves as a water distribution pipe, and the first water collecting and distributing pipe 11 serves as a water collecting pipe. The incoming water enters the second connecting pipe 18 through the second water inlet pipe 4, and then is evenly distributed through the second water collecting and distributing pipe 12 to enter the right wetland unit. The water passes through the packing layer from right to left, enters the left wetland unit through the connecting hole 13, and finally enters the first water outlet pipe 5 through the first water collecting and distributing pipe 11 and the first connecting pipe 17. In this process, the water is purified.

[0041] When the operation mode is changed, it can be considered that the wetland bed is backwashed while treating sewage. The above two operation modes are adjusted periodically according to the actual operation conditions, and the operation cycle is generally 2-3 months / time.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model, and the rest not described in detail shall belong to the prior art.

Claims

1. A bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland, characterized by: The wetland pool (1) comprises a first connecting pipe (17) and a second connecting pipe (18) respectively arranged on both sides of the upper part of the wetland pool (1); one end of the first connecting pipe (17) is respectively connected to a first water inlet pipe (3) and a first water outlet pipe (5), and the other end is connected to a first water collecting and distributing pipe (11); one end of the second connecting pipe (18) is respectively connected to a second water inlet pipe (4) and a second water outlet pipe (6), and the other end is connected to a second water collecting and distributing pipe (12); The first water inlet pipe (3) and the second water inlet pipe (4) are connected to a water inlet main pipe (2) located on one side of the wetland pool, and the first water outlet pipe (5) and the second water outlet pipe (6) are connected to a water outlet main pipe (16) located on the other side of the wetland pool; the wetland pool (1) is divided into two wetland units, left and right, by a partition wall (20), and fillers (19) are arranged inside the two wetland units.

2. A bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 1, characterized in that: The first water inlet pipe (3) and the second water inlet pipe (4) are respectively provided with a first water inlet control valve (7) and a second water inlet control valve (8); the first water outlet pipe (5) and the second water outlet pipe (6) are respectively provided with a first water outlet control valve (9) and a second water outlet control valve (10); and piers are provided below the first water inlet control valve (7), the second water inlet control valve (8), the first water outlet control valve (9) and the second water outlet control valve (10).

3. The bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 1, characterized in that: The central axes of the first water inlet pipe (3), the second water inlet pipe (4), the first water outlet pipe (5), the second water outlet pipe (6), the first connecting pipe (17), the second connecting pipe (18), the first water collecting and distributing pipe (11) and the second water collecting and distributing pipe (12) are all located on the same horizontal plane.

4. The bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 1, characterized in that: A plurality of communication holes (13) are provided at the bottom of the partition wall (20).

5. The bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 1, characterized in that: A vent pipe (14) is provided at the bottom of the left and right wetland units of the wetland pool (1), a vent control valve (15) is provided on the vent pipe (14), and a buttress is provided below the vent control valve (15).

6. The bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 1, characterized in that: The filler (19) in each wetland unit includes water collection and distribution area fillers (193) arranged at both ends and a main area filler arranged in the middle, and the main area filler includes a planting layer filler (191) and a main layer filler (192) from top to bottom, and the first water collection and distribution pipe (11) and the second water collection and distribution pipe (12) are both arranged above the inside of the water collection and distribution area filler (193).

7. A bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 6, characterized in that: The planting layer filler (191) is limestone with a particle size of 8 to 12 mm and a thickness of 200 to 300 mm; the main layer filler (192) is one or any combination of limestone, ceramsite, zeolite and volcanic rock with a particle size of 15 to 25 mm and a thickness of 800 to 1200 mm; the water collection and distribution area filler (193) is limestone with a particle size of 50 to 70 mm and a thickness of 1000 to 1500 mm, and the total width of the water collection and distribution area filler (193) from left to right in the horizontal direction is 1000 to 1500 mm.

8. The bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 6, characterized in that: Emergent plants (21) are planted on the upper part of the planting layer filler (191).

9. A bidirectional self-cleaning and anti-clogging horizontal subsurface flow artificial wetland according to claim 8, characterized in that: The emergent plants (21) include one or any combination of cattail, reed, canna, juniper or rush, with a planting density of 12-20 plants / m 2 .

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