Anti-blocking composite vertical flow constructed wetland with sludge discharge function

Abstract

The invention discloses an anti-blocking composite vertical flow constructed wetland with a sludge discharge function, and solves the technical problems of poor sewage treatment effect, difficulty in sludge cleaning and the like. The constructed wetland comprises at least one group of treatment ponds, each treatment pond comprises a down-flow type unit pond, an up-flow type unit pond, a conducting pipe group, a water inlet assembly, a water collecting assembly and a sludge discharging assembly, and the down-flow type unit ponds are communicated with the up-flow type unit ponds through the conducting pipe groups; one end of the water inlet assembly is connected with the water inlet pipeline, the other end of the water inlet assembly is located at the top layer position of the filter filling layer in the downward flow type unit pool, one end of the water collecting assembly is communicated with the water collecting channel, the other end of the water collecting assembly is located at the top layer position of the filter filling layer in the upward flow type unit pool, one end of the sludge discharging assembly is communicated with the sludge discharging channel, and the other end of the sludge discharging assembly is located in the upward flow type unit pool. And the connecting pipe is communicated with the conducting pipe group. According to the invention, the retention time of sewage in the wetland can be prolonged, the sewage treatment effect is improved, regular discharge of sludge in the wetland can be realized, and the risk of blockage of the filter filling layer is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial wetland sewage treatment, and in particular relates to an anti-clogging composite vertical flow artificial wetland with a mud discharge function. Background Art

[0002] Artificial wetlands are a purification process artificially constructed to simulate and enhance natural wetlands. Artificial wetlands purify polluted water by simulating the biological, microbial, physical and chemical synergistic functions of natural wetlands, and utilizing physical filtration, adsorption, reaction precipitation, plant absorption and microbial decomposition.

[0003] Artificial wetlands are divided into horizontal flow artificial wetlands and vertical flow artificial wetlands according to the different water inlet methods. Compared with horizontal flow artificial wetlands, vertical flow artificial wetlands have better removal effects on organic pollutants. Therefore, vertical flow artificial wetlands are more widely used.

[0004] However, when sewage is treated in vertical flow artificial wetlands, the sewage stays in the wetlands for a short time and there are local short-circuits inside the wetlands, which affects the sewage treatment effect. Moreover, after long-term use of vertical flow artificial wetlands, sludge will accumulate in the filter filling layer, which is prone to clogging of the filter filling layer, thus affecting the service life and stability of use, which needs to be improved. Summary of the invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide an anti-clogging composite vertical flow artificial wetland with sludge discharge function, which can increase the residence time of sewage in the wetland, improve the problem of local short flow inside the wetland, so as to improve the treatment effect of sewage, and at the same time realize the regular discharge of sludge in the wetland, reduce the risk of clogging of the filter filling layer, thereby improving the service life and stability of the wetland.

[0006] The present invention provides an anti-clogging composite vertical flow artificial wetland with a mud discharge function, comprising at least one group of treatment pools, each group of the treatment pools comprising:

[0007] Downflow unit pool, with an anti-seepage layer, a filtration filling layer and a vegetation layer arranged from bottom to top;

[0008] The upflow unit pool has an anti-seepage layer, a filtration filling layer and a vegetation layer arranged from bottom to top;

[0009] A conducting pipe group, one end of which is located at the bottom layer of the filter filling layer in the downflow unit pool, and the other end of which is located at the bottom layer of the filter filling layer in the upflow unit pool;

[0010] A water inlet assembly, one end of which is connected to the water inlet pipe and the other end of which is located at the top layer of the filter filling layer in the downflow unit pool;

[0011] A water receiving assembly, one end of which is connected to the water receiving channel and the other end of which is located at the top layer of the filter filling layer in the upflow unit pool;

[0012] The mud discharge assembly has one end connected to the mud discharge channel and the other end located in the upstream unit pool and connected to the conduction pipe group.

[0013] Optionally, the water inlet assembly comprises:

[0014] A water inlet main pipe, one end of which is connected to the water inlet pipe and the other end of which is located at the top layer of the filter filling layer in the upflow unit pool;

[0015] A water inlet branch pipe is horizontally arranged in the downflow unit pool and connected to the water inlet main pipe, and the water inlet branch pipe is located at the top layer of the filter filling layer in the downflow unit pool;

[0016] A water inlet valve well is arranged between the downstream unit pool and the water inlet pipeline, and the water inlet main pipe passes through the water inlet valve well;

[0017] The water inlet control valve is arranged in the water inlet valve well and connected to the water inlet main pipe, and the water inlet control valve is used to control the opening and closing of the water inlet main pipe.

[0018] Optionally, the water inlet main pipe is located at the center of the downstream unit pool, and multiple pairs of water inlet branch pipes are provided, and the multiple pairs of water inlet branch pipes are symmetrically distributed on both sides of the water inlet main pipe, and each of the water inlet branch pipes is respectively provided with multiple water inlet holes.

[0019] Optionally, the water collection assembly includes:

[0020] A water receiving main pipe, one end of which is connected to the water receiving channel and the other end of which is located at the top layer of the filter filling layer in the downflow unit pool;

[0021] A water receiving branch pipe is horizontally arranged in the upflow unit pool and connected to the water receiving main pipe, and the water receiving branch pipe is located at the top layer of the filter filling layer in the upflow unit pool;

[0022] A water receiving valve well is arranged between the upstream unit pool and the water receiving channel, and the water receiving main pipe passes through the water receiving valve well;

[0023] The water collection control valve is arranged in the water collection valve well and connected to the water collection main pipe, and the water collection control valve is used to control the opening and closing of the water collection main pipe.

[0024] Optionally, the water receiving main pipe is located at the center of the upflow unit pool, and multiple pairs of water receiving branch pipes are provided, and the multiple pairs of water receiving branch pipes are symmetrically distributed on both sides of the water receiving main pipe, and each of the water receiving branch pipes is respectively provided with multiple water receiving holes.

[0025] Optionally, the mud discharge assembly comprises:

[0026] A mud discharge branch pipe is arranged in the upflow unit pool and connected to the conducting pipe group;

[0027] A mud discharge main pipe, one end of which is connected to the mud discharge channel and the other end of which is connected to the mud discharge branch pipe;

[0028] The mud discharge control valve is connected to one end of the mud discharge main pipe located at the mud discharge channel and is used to control the opening and closing of the mud discharge main pipe.

[0029] Optionally, each group of treatment pools further comprises:

[0030] A backwash water inlet pipe, one end of which is connected to the flushing pipeline, and the other end of which is located in the mud discharge channel and connected to the mud discharge main pipe;

[0031] A backwash control valve is connected to the backwash water inlet pipe and is used to control the opening and closing of the backwash water inlet pipe;

[0032] A communication control well is arranged in the downstream unit pool or the upstream unit pool, and the ends of the water inlet main pipe and the water receiving main pipe close to each other extend into the communication control well respectively;

[0033] A communication control pipe is arranged in the communication control well, and one end of the communication control pipe is connected to the water inlet main pipe, and the other end is connected to the water receiving main pipe;

[0034] A communication control valve, which is arranged on the communication control pipe and is used to control the opening and closing of the communication control pipe;

[0035] A backwash drainage pipe, one end of which is connected to the mud drainage channel, and the other end of which extends into the water receiving valve well and is connected to the water receiving main pipe;

[0036] A drainage control valve is arranged in the water receiving valve well and connected to the backwash drainage pipe, and the drainage control valve is used to control the opening and closing of the backwash drainage pipe.

[0037] Optionally, the conducting pipe group includes a plurality of connecting pipes arranged horizontally and in parallel, and each of the connecting pipes is evenly provided with a plurality of connecting holes, one end of the plurality of connecting pipes is respectively located at the bottom layer of the filter filling layer in the downstream unit pool, and the other end is respectively located at the bottom layer of the filter filling layer in the upstream unit pool, and are respectively connected to the sludge discharge main pipe.

[0038] Optionally, one end of each of the connecting pipes located in the downstream unit pool is vertically connected to a ventilation pipe, and the top of the ventilation pipe is higher than the vegetation layer in the downstream unit pool.

[0039] Optionally, the pool bottom slope of the downflow unit pool and the upflow unit pool is 0.15%-0.3%.

[0040] It can be seen from the above technical scheme that the anti-clogging composite vertical flow artificial wetland with mud discharge function provided by the present invention has the following advantages:

[0041] The artificial wetland adopts a combination of a downstream vertical flow artificial wetland and an upstream vertical flow artificial wetland to form a composite vertical flow artificial wetland. Since the bottoms of the downstream unit pool and the upstream unit pool are connected through a conducting pipe group, the sewage flows through the downstream unit pool and the upstream unit pool successively, forming a "U"-shaped connection, thereby increasing the residence time of the sewage in the wetland and reducing the problem of local short-flow inside the wetland, thereby improving the treatment effect of sewage. At the same time, the end of the conducting pipe group is connected to the mud discharge assembly, so that the sludge in the downstream unit pool and the upstream unit pool can be regularly discharged through the conducting pipe group and the mud discharge assembly, reducing the risk of clogging of the filter filling layer, thereby improving the use stability and service life of the artificial wetland. Not only that, the artificial wetland can realize the backwashing of the filter filling layer, further reducing the risk of clogging of the filter filling layer, thereby ensuring the stable use of the artificial wetland.

[0042] Other features and advantages of the present invention will be set forth in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0044] Figure 1 It is a top view of an embodiment of the present invention, mainly used to show the states of multiple downflow unit pools and multiple upflow unit pools;

[0045] Figure 2 This is a top view of an embodiment of the present invention, mainly used to show the structure and position of the conducting tube group;

[0046] Figure 3 This is a top view of an embodiment of the present invention, mainly used to show the structure and position of the water inlet assembly and the water receiving assembly;

[0047] Figure 4 It is a top view of an embodiment of the present invention, mainly used to show the state of a downflow unit pool and an upflow unit pool;

[0048] Figure 5 It is a top view of an embodiment of the present invention, mainly used to show the states of two downflow unit pools and two upflow unit pools;

[0049] Figure 6 for Figure 2 Sectional view along AA;

[0050] Figure 7 for Figure 3 Sectional view along BB;

[0051] Figure 8 Schematic diagram of the internal structure of the downflow unit cell in an embodiment of the present invention.

[0052] Description of reference numerals:

[0053] 100. Treatment pool; 1. Downstream unit pool; 2. Upstream unit pool; 3. Conducting pipe group; 31. Connecting pipe; 32. Ventilation pipe; 4. Water inlet assembly; 41. Water inlet main pipe; 42. Water inlet branch pipe; 43. Water inlet valve well; 44. Water inlet control valve; 5. Water receiving assembly; 51. Water receiving main pipe; 52. Water receiving branch pipe; 53. Water receiving valve well; 54. Water receiving control valve; 6. Mud discharge assembly; 61. Mud discharge branch pipe; 62. Mud discharge main pipe; 63. Mud discharge control valve; 7. Water inlet pipeline; 8. Water receiving channel; 9. Mud discharge channel; 10. Flushing pipeline; 11. Backwashing water inlet pipe; 12. Backwashing control valve; 13. Connecting control well; 14. Connecting control pipe; 15. Connecting control valve; 16. Backwashing drain pipe; 17. Drainage control valve. DETAILED DESCRIPTION

[0054] To make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0055] like Figure 1-Figure 8 An embodiment of the present invention is shown, in which an anti-clogging composite vertical flow artificial wetland with a mud discharge function is disclosed, including at least one group of treatment pools 100, each group of treatment pools 100 includes a downstream unit pool 1, an upstream unit pool 2, a conducting pipe group 3, a water inlet assembly 4, a water collection assembly 5 and a mud discharge assembly 6, and the interiors of the downstream unit pool 1 and the upstream unit pool 2 are respectively provided with an anti-seepage layer, a filtration filling layer and a vegetation layer from bottom to top.

[0056] In one embodiment, Figure 1 , Figure 2As shown, one end of the conducting pipe group 3 is located at the bottom position of the filter filling layer in the downstream unit pool 1, and the other end is located at the bottom position of the filter filling layer in the upstream unit pool 2, so that the conducting pipe group 3 connects the downstream unit pool 1 and the upstream unit pool 2.

[0057] In one embodiment, Figure 1 , Figure 2 , Figure 3 As shown, one end of the water inlet assembly 4 is connected to the water inlet pipe 7, and the other end extends into the downstream unit pool 1 and is located at the top layer of the filter filling layer in the downstream unit pool 1. One end of the water receiving assembly 5 is connected to the water receiving channel 8, and the other end is located at the top layer of the filter filling layer in the upstream unit pool 2. One end of the mud discharge assembly 6 is connected to the mud discharge channel 9, and the other end is located in the upstream unit pool 2 and is connected to the conduction pipe group 3.

[0058] The sewage in the water inlet pipe 7 enters the downstream unit pool 1 through the water inlet assembly 4, and the sewage flows from top to bottom in the downstream unit pool 1. At this time, the filter filling layer in the downstream unit pool 1 filters the sewage. Subsequently, the sewage in the downstream unit pool 1 enters the upstream unit pool 2 through the conduction pipe group 3, and the sewage flows from bottom to top in the upstream unit pool 2. At this time, the filter filling layer in the downstream unit pool 1 filters the sewage again, and then the filtered sewage is discharged into the water receiving channel 8 through the water receiving assembly 5. After the artificial wetland has been used for a period of time, the sludge in the downstream unit pool 1 and the upstream unit pool 2 enters the conduction pipe group 3. At this time, the sludge in the conduction pipe group 3 can be discharged through the sludge discharge assembly 6, and the sludge is discharged into the sludge discharge channel 9.

[0059] The anti-clogging composite vertical flow artificial wetland with mud discharge function in this embodiment adopts the method of combining the downstream vertical flow artificial wetland with the upstream vertical flow artificial wetland to form a composite vertical flow artificial wetland. Since the bottoms of the downstream unit pool 1 and the upstream unit pool 2 are connected through the conducting pipe group 3, the sewage flows through the downstream unit pool 1 and the upstream unit pool 2 successively, forming a "U"-shaped connection, thereby increasing the residence time of the sewage in the wetland, reducing the problem of local short-flow inside the wetland, and improving the treatment effect of the sewage. In addition, the end of the conducting pipe group 3 is connected to the mud discharge assembly 6, so that the sludge in the downstream unit pool 1 and the upstream unit pool 2 can be regularly discharged through the conducting pipe group 3 and the mud discharge assembly 6, reducing the risk of clogging of the filter filling layer, thereby improving the use stability and service life of the artificial wetland.

[0060] like Figure 4 As shown, if the artificial wetland includes a group of treatment pools 100, it can be regarded as a partition vertically arranged in the pool body, and the partition is used to divide the treatment pool 100 into a downstream unit pool 1 and an upstream unit pool 2. Figure 5As shown, if the artificial wetland includes two groups of treatment pools 100, it can be regarded as a cross-shaped partition provided in the pool body, and the treatment pool 100 is divided into two downstream unit pools 1 and two upstream unit pools 2 by using the cross-shaped partition. Figure 1 As shown, the multiple groups of treatment pools 100 can be regarded as using partitions to divide the treatment pools 100 into multiple downstream unit pools 1 and multiple upstream unit pools 2.

[0061] In one embodiment, Figure 2 , Figure 6 As shown, the conducting pipe group 3 includes a plurality of horizontally and parallelly arranged connecting pipes 31, and each connecting pipe 31 is evenly provided with a plurality of connecting holes. One end of the plurality of connecting pipes 31 is respectively located at the bottom position of the filter filling layer in the downstream unit pool 1, and the other end is respectively located at the bottom position of the filter filling layer in the upstream unit pool 2, and is respectively connected to the mud discharge assembly 6. At the same time, one end of each connecting pipe 31 located in the downstream unit pool 1 is respectively vertically connected to a vent pipe 32, and the top end of the vent pipe 32 is higher than the vegetation layer in the downstream unit pool 1 to balance the pressure in the connecting pipe 31.

[0062] In one embodiment, Figure 3 , Figure 7 As shown, the water inlet assembly 4 includes a water inlet main pipe 41, a water inlet branch pipe 42, a water inlet valve well 43 and a water inlet control valve 44, one end of the water inlet main pipe 41 is connected to the water inlet pipe 7, and the other end is located at the top layer of the filter filling layer in the downstream unit pool 1, and the water inlet main pipe 41 is located at the center of the downstream unit pool 1.

[0063] In one embodiment, Figure 3 , Figure 7 As shown, multiple pairs of water inlet branch pipes 42 are provided, and the multiple pairs of water inlet branch pipes 42 are symmetrically connected to both sides of the water inlet main pipe 41. The multiple pairs of water inlet branch pipes 42 are respectively located at the top layer of the filter filling layer in the downstream unit pool 1, and each water inlet branch pipe 42 is respectively provided with multiple water inlet holes.

[0064] In one embodiment, Figure 3 , Figure 7 As shown, the water inlet valve well 43 is arranged between the downstream unit pool 1 and the water inlet pipe 7, and the water inlet main pipe 41 passes through the water inlet valve well 43. The water inlet control valve 44 is arranged in the water inlet valve well 43, and the water inlet control valve 44 is connected to the water inlet main pipe 41 to realize the control of opening and closing of the water inlet main pipe 41.

[0065] In this embodiment, the diameter of the water inlet main pipe 41 is DN200, and the diameter of the water inlet branch pipe 42 is DN100. At the same time, the water inlet main pipe 41 and the water inlet branch pipe 42 are 10 cm away from the upper surface of the filter filling layer.

[0066] In one embodiment, Figure 3 , Figure 7 As shown, the water collection assembly 5 includes a water collection main pipe 51, a water collection branch pipe 52, a water collection valve well 53 and a water collection control valve 54. One end of the water collection main pipe 51 is connected to the water collection channel 8, and the other end is located at the top layer of the filter filling layer in the upstream unit pool 2, and the water collection main pipe 51 is located at the center of the upstream unit pool 2.

[0067] In one embodiment, Figure 3 , Figure 7 As shown, multiple pairs of water receiving branch pipes 52 are provided, and the multiple pairs of water receiving branch pipes 52 are symmetrically connected to the two sides of the water receiving main pipe 51. The multiple pairs of water receiving branch pipes 52 are respectively located at the top layer position of the filter filling layer in the upstream unit pool 2, and each water receiving branch pipe 52 is respectively provided with multiple water receiving holes.

[0068] In one embodiment, Figure 3 , Figure 7 As shown, the water receiving valve well 53 is arranged between the upstream unit pool 2 and the water receiving channel 8, and the water receiving main pipe 51 passes through the water receiving valve well 53. The water receiving control valve 54 is arranged in the water receiving valve well 53, and the water receiving control valve 54 is connected to the water receiving main pipe 51 to realize the control of opening and closing of the water receiving main pipe 51.

[0069] In this embodiment, the diameter of the water receiving main pipe 51 is DN200, and the diameter of the water receiving branch pipe 52 is DN100. At the same time, the water receiving main pipe 51 and the water receiving branch pipe 52 are 10 cm away from the upper surface of the filter filling layer.

[0070] In one embodiment, Figure 2 , Figure 3 As shown, the mud discharge assembly 6 includes a mud discharge branch pipe 61, a mud discharge main pipe 62 and a mud discharge control valve 63. The mud discharge branch pipe 61 is arranged in the upstream unit pool 2, and a plurality of conducting pipes are respectively connected to the mud discharge branch pipe 61. One end of the mud discharge main pipe 62 is connected to the mud discharge channel 9, and the other end extends into the upstream unit pool 2 and is connected to the mud discharge branch pipe 61. The mud discharge control valve 63 is connected to one end of the mud discharge main pipe 62 located in the mud discharge channel 9, and the mud discharge control valve 63 is used to control the opening and closing of the mud discharge main pipe 62.

[0071] In this embodiment, the diameters of the mud discharge main pipe 62 and the mud discharge branch pipe 61 are DN200 respectively.

[0072] In one embodiment, Figure 6As shown, each treatment pool 100 further includes a backwashing water inlet pipe 11 and a backwashing control valve 12. One end of the backwashing water inlet pipe 11 is connected to the flushing pipeline 10, and the other end is located in the mud discharge channel 9 and connected to the mud discharge main pipe 62. The backwashing control valve 12 is arranged in the mud discharge channel 9 and connected to the backwashing water inlet pipe 11. At the same time, the backwashing control valve 12 is used to control the opening and closing of the backwashing water inlet pipe 11.

[0073] In one embodiment, Figure 7 As shown, a communication control well 13 is provided in the downstream unit pool 1 or the upstream unit pool 2, a communication control pipe 14 is provided in the communication control well 13, and the ends of the water inlet main pipe 41 and the water receiving main pipe 51 close to each other extend into the communication control well 13 respectively, and the water inlet main pipe 41 and the water receiving main pipe 51 are respectively connected to the corresponding ends of the communication control pipe 14. At the same time, a communication control valve 15 is connected to the communication control pipe 14, and the communication control valve 15 is used to control the opening and closing of the communication control pipe 14.

[0074] In one embodiment, Figure 6 , Figure 7 As shown, each treatment pool 100 further includes a backwash drain pipe 16 and a drain control valve 17. One end of the backwash drain pipe 16 is connected to the mud discharge channel 9, and the other end extends into the water receiving valve well 53 and is connected to the water receiving main pipe 51. The drain control valve 17 is disposed in the water receiving valve well 53 and is connected to the backwash drain pipe 16. The drain control valve 17 is used to control the opening and closing of the backwash drain pipe 16.

[0075] The artificial wetland in this embodiment has three modes, and the specific modes and operation processes are as follows:

[0076] Mode 1: Sewage treatment mode

[0077] The water inlet control valve 44 and the water receiving control valve 54 are opened, and the mud discharge control valve 63, the backwash control valve 12, and the connecting control valve 15 are closed. The sewage in the water inlet pipe 7 enters the water inlet main pipe 41, and enters the downstream unit pool 1 through multiple water inlet branches 42. At this time, the sewage in the downstream unit pool 1 flows from top to bottom and enters the connecting pipe 31. Subsequently, the sewage in the connecting pipe 31 enters the upstream unit pool 2. At this time, the sewage in the upstream unit pool 2 flows from bottom to top, and then the sewage enters the water receiving main pipe 51 through multiple water receiving branches 52, and finally is discharged into the drainage channel, thereby realizing the treatment of sewage.

[0078] Mode 2: Mud discharge mode

[0079] Open the sludge discharge control valve 63, close the water inlet control valve 44, the water collection control valve 54, the backwash control valve 12, and the connecting control valve 15. The sludge in the connecting pipe 31 enters the sludge discharge main pipe 62 through the sludge discharge branch pipe 61, and is finally discharged into the sludge discharge channel 9, thereby realizing the sludge discharge treatment. Regular sludge discharge operations can alleviate the problem of clogging of the filter filling layer and extend the service life of the wetland.

[0080] Mode 3: Backwash mode

[0081] Open the backwash control valve 12 and the connecting control valve 15, close the water inlet control valve 44, the water collection control valve 54, and the mud discharge control valve 63, and the clean water in the flushing pipe 10 enters the backwash pipe 10, and then enters the mud discharge branch pipe 61 through the mud discharge main pipe 62, and then enters the downstream unit pool 1 and the upstream unit pool 2 through multiple connecting pipes 31. The clean water flows from bottom to top in the downstream unit pool 1 and the upstream unit pool 2 to achieve backwashing of the filling filter layer.

[0082] As the water levels in the downstream unit pool 1 and the upstream unit pool 2 continue to rise, the sewage in the upstream unit pool 2 enters the water receiving main pipe 51 through multiple water receiving branches 52, and the sewage in the downstream unit pool 1 enters the water inlet main pipe 41 through multiple water inlet branches 42, and then flows into the water receiving main pipe 51 through the connecting control pipe 14. Subsequently, the sewage enters the backwash drain pipe 16 through the water receiving main pipe 51, and is finally discharged into the mud discharge channel 9.

[0083] In one embodiment, Figure 6 , Figure 7 As shown, the pool bottom slope of the downstream unit pool 1 and the upstream unit pool 2 is 0.15%-0.3%, and at the same time, the conducting pipe group 3 also has a slope, so that the sewage in the downstream unit pool 1 can smoothly pass through the conducting pipe group 3 into the upstream unit pool 2. In this embodiment, the pool bottom slopes of the downstream unit pool 1 and the upstream unit pool 2 are 0.2%, respectively. Of course, in other embodiments, other values ​​may also be used.

[0084] In one embodiment, Figure 8 As shown, the anti-seepage layers in the downstream unit pool 1 and the upstream unit pool 2 respectively include 10 cm thick coarse sand, PE geotechnical anti-seepage membrane, and 10 cm thick coarse sand arranged in sequence from top to bottom, and the upper and lower layers of coarse sand can have a good protective effect on the PE geotechnical anti-seepage membrane.

[0085] In one embodiment, Figure 8As shown, the vegetation layer is an important component of the artificial wetland. The artificial wetland can effectively absorb, accumulate and decompose inorganic and organic pollutants in the polluted water through the plant root system. At the same time, the biofilm formed by microorganisms attached to the root system can also decompose organic matter in the polluted water. In this embodiment, the aquatic plants of the vegetation layer are reeds, cannas, irises or calamus.

[0086] In one embodiment, Figure 8 As shown, the filter filling layers in the downstream unit pool 1 and the upstream unit pool 2 are respectively composed of matrices with different particle size gradations and different materials. The filter filling layer in the downstream unit pool 1 is 10 cm thicker than the filter filling layer in the upstream unit pool 2.

[0087] In this embodiment, the filter filling layer is distributed in multiple layers and multiple grades, and the particle size of the matrix increases gradually from top to bottom. The particle size, thickness and matrix material of the filter filling layer can be selected according to different engineering properties, different water sources, different regions, different scales and different treatment effects. According to existing test data and engineering practice experience, everything from extremely fine soil to large gravel (pebbles) with a diameter of 120 mm can be used as alternative materials, among which zeolite, limestone, gravel, shale, vermiculite, wollastonite, blast furnace slag, coal ash slag, peat, ceramic filter materials, etc. can all be selected.

[0088] In this embodiment, the filter filling layer in the downflow unit pool 1 is set from top to bottom as follows: 30cm thick volcanic rock with a particle size of 8-16mm, 30cm thick crushed stone with a particle size of 16-32mm, 30cm thick volcanic rock with a particle size of 16-32mm, and 40-60cm thick crushed stone with a particle size of 32-64mm. The filter filling layer in the upflow unit pool 2 is set from top to bottom as follows: 30cm thick volcanic rock with a particle size of 8-16mm, 30cm thick crushed stone with a particle size of 16-32mm, 30cm thick volcanic rock with a particle size of 16-32mm, and 30-50cm thick crushed stone with a particle size of 32-64mm.

[0089] From the above, it can be seen that the present invention forms a composite vertical flow artificial wetland by combining a downstream vertical flow artificial wetland and an upstream vertical flow artificial wetland. At the same time, the downstream vertical flow artificial wetland and the upstream vertical flow artificial wetland are connected in a "U" shape through the conducting pipe group 3, which can effectively increase the residence time of sewage in the wetland and reduce local short-circuit in the wetland. In addition, the sewage is filtered twice to effectively improve the treatment effect of the sewage.

[0090] At the same time, the present invention can regularly discharge the sludge deposited in the filter filling layer, effectively alleviate the problem of clogging of the filter filling layer in the wetland, thereby extending the service life of the wetland and improving the stability of the use of the wetland. In addition, the artificial wetland can also realize the backwashing of the filter filling layer and the conduction pipe group 3, reduce the risk of clogging of the filter filling layer and the conduction pipe group 3, and thus ensure the stable use of the artificial wetland.

[0091] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0092] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An anti-clogging composite vertical flow artificial wetland with mud discharge function, characterized in that: The invention comprises at least one group of treatment pools (100), each group of treatment pools (100) respectively comprising: A downflow unit pool (1) is provided with an anti-seepage layer, a filtration filling layer and a vegetation layer in sequence from bottom to top; The upflow unit pool (2) has an anti-seepage layer, a filtration filling layer and a vegetation layer arranged in sequence from bottom to top; A conduction pipe group (3), one end of which is located at the bottom layer of the filter filling layer in the downstream unit pool (1), and the other end of which is located at the bottom layer of the filter filling layer in the upstream unit pool (2); A water inlet assembly (4), one end of which is connected to the water inlet pipe (7) and the other end of which is located at the top layer of the filter filling layer in the downflow unit pool (1); A water receiving assembly (5), one end of which is connected to the water receiving channel (8) and the other end of which is located at the top layer of the filter filling layer in the upflow unit pool (2); The mud discharge assembly (6) has one end connected to the mud discharge channel (9) and the other end located in the upstream unit pool (2) and connected to the conduction pipe group (3).

2. The artificial wetland according to claim 1, characterized in that: The water inlet assembly (4) comprises: A water inlet main pipe (41), one end of which is connected to the water inlet pipe (7) and the other end of which is located at the top layer of the filter filling layer in the downflow unit pool (1); A water inlet branch pipe (42) is horizontally arranged in the downstream unit pool (1) and connected to the water inlet main pipe (41), and the water inlet branch pipe (42) is located at the top layer of the filter filling layer in the downstream unit pool (1); A water inlet valve well (43) is arranged between the downstream unit pool (1) and the water inlet pipeline (7), and the water inlet main pipe (41) passes through the water inlet valve well (43); The water inlet control valve (44) is arranged in the water inlet valve well (43) and connected to the water inlet main pipe (41), and the water inlet control valve (44) is used to control the opening and closing of the water inlet main pipe (41).

3. The artificial wetland according to claim 2, characterized in that: The water inlet main pipe (41) is located at the center of the downstream unit pool (1), and a plurality of pairs of water inlet branch pipes (42) are provided. The plurality of pairs of water inlet branch pipes (42) are symmetrically distributed on both sides of the water inlet main pipe (41), and each of the water inlet branch pipes (42) is respectively provided with a plurality of water inlet holes.

4. The artificial wetland according to claim 2, characterized in that: The water receiving assembly (5) comprises: A water receiving main pipe (51), one end of which is connected to the water receiving channel (8) and the other end of which is located at the top layer of the filtering filling layer in the upflow unit pool (2); A water receiving branch pipe (52) is horizontally arranged in the upflow unit pool (2) and connected to the water receiving main pipe (51), and the water receiving branch pipe (52) is located at the top layer of the filter filling layer in the upflow unit pool (2); A water receiving valve well (53) is arranged between the upstream unit pool (2) and the water receiving channel (8), and the water receiving main pipe (51) passes through the water receiving valve well (53); The water collection control valve (54) is arranged in the water collection valve well (53) and connected to the water collection main pipe (51), and the water collection control valve (54) is used to control the opening and closing of the water collection main pipe (51).

5. The artificial wetland according to claim 4, characterized in that: The water receiving main pipe (51) is located at the center of the upflow type unit pool (2), and a plurality of pairs of water receiving branch pipes (52) are provided. The plurality of pairs of water receiving branch pipes (52) are symmetrically distributed on both sides of the water receiving main pipe (51), and each of the water receiving branch pipes (52) is respectively provided with a plurality of water receiving holes.

6. The artificial wetland according to claim 4, characterized in that: The mud discharge assembly (6) comprises: A mud discharge branch pipe (61) is arranged in the upflow unit pool (2) and connected to the conduction pipe group (3); A mud discharge main pipe (62), one end of which is connected to the mud discharge channel (9) and the other end of which is connected to the mud discharge branch pipe (61); The mud discharge control valve (63) is connected to one end of the mud discharge main pipe (62) located in the mud discharge channel (9) and is used to control the opening and closing of the mud discharge main pipe (62).

7. The artificial wetland according to claim 6, characterized in that: Each group of treatment pools (100) further comprises: A backwash water inlet pipe (11), one end of which is connected to the flushing pipe (10), and the other end of which is located in the mud discharge channel (9) and connected to the mud discharge main pipe (62); A backwash control valve (12), connected to the backwash water inlet pipe (11), and used to control the opening and closing of the backwash water inlet pipe (11); A communication control well (13) is arranged in the downstream unit pool (1) or the upstream unit pool (2), and the ends of the water inlet main pipe (41) and the water receiving main pipe (51) close to each other extend into the communication control well (13); A communication control pipe (14) is arranged in the communication control well (13), and one end of the communication control pipe (14) is connected to the water inlet main pipe (41), and the other end is connected to the water receiving main pipe (51); A communication control valve (15), which is arranged on the communication control pipe (14) and is used to control the opening and closing of the communication control pipe (14); A backwash drainage pipe (16), one end of which is connected to the mud drainage channel (9), and the other end of which extends into the water receiving valve well (53) and is connected to the water receiving main pipe (51); The drainage control valve (17) is arranged in the water receiving valve well (53) and is connected to the backwash drainage pipe (16). The drainage control valve (17) is used to control the opening and closing of the backwash drainage pipe (16).

8. The artificial wetland according to claim 6, characterized in that: The conducting pipe group (3) comprises a plurality of connecting pipes (31) arranged horizontally and in parallel, and each of the connecting pipes (31) is evenly provided with a plurality of connecting holes, one end of each of the connecting pipes (31) is located at the bottom layer of the filter filling layer in the downstream unit pool (1), and the other end is located at the bottom layer of the filter filling layer in the upstream unit pool (2), and is respectively connected to the sludge discharge main pipe (62).

9. The artificial wetland according to claim 8, characterized in that: One end of each of the connecting pipes (31) located in the downstream unit pool (1) is vertically connected to a ventilation pipe (32), and the top end of the ventilation pipe (32) is higher than the vegetation layer in the downstream unit pool (1).

10. The artificial wetland according to claim 1, characterized in that: The pool bottom slopes of the downflow unit pool (1) and the upflow unit pool (2) are 0.15%-0.3%.

Images