Water distribution device for surface flow cell of constructed wetland and constructed wetland

Abstract

The application provides a water distribution device for a surface flow pool of a constructed wetland and a constructed wetland, and the water distribution device comprises a water flow channel, one side of the water flow channel is sequentially provided with a first water distribution groove, a first sedimentation pool, a second water distribution groove, a second sedimentation pool and a third water distribution groove along the water flow direction of the water flow channel, one end of the first water distribution groove, one end of the second water distribution groove and one end of the third water distribution groove are connected with the water flow channel, a three-way valve A is arranged at the connection position of the first water distribution groove and the water flow channel, and a three-way valve B is arranged at the connection position of the second water distribution groove and the water flow channel. By adopting the application, the mine water flow path in the water flow channel is switched through the three-way valves, and the three water distribution grooves are cooperated with each other, so that the working mode of one use and one standby of the first sedimentation pool and the second sedimentation pool is realized; the first sedimentation pool and the second sedimentation pool are arranged along the water flow direction, are suitable for construction in mountainous and lake areas with narrow space, and do not need to reduce the width of the surface flow area sedimentation pool.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment device, in particular to a water distribution device for surface flow pool of constructed wetland and the constructed wetland. BACKGROUND

[0002] A large amount of acid mine water is generated in the process of coal mine production, and if it is directly discharged without treatment, it will cause damage to the ecological environment and bring great harm to underground production. At present, the method for treating acid mine water is mostly end treatment, that is, a treatment facility is established at the mine water outlet point of the coal mine wellhead. However, in some areas, mountains and lakes are more, and plain areas are less, which greatly limits the construction of the treatment facility. For the special topography of mountainous and lake areas, the following methods are mostly used for treatment: adding limestone, periclase and other alkaline materials to the mine water to increase the pH value, and performing neutralization reaction to remove most of the iron and manganese ions in the acid mine water; no flocculating agent is added during the reaction process, and the flow rate is fast, so the generated precipitate cannot be settled, and therefore a subsequent artificial wetland system needs to be set up for deep reaction, and finally discharged up to the standard.

[0003] During the treatment process of the artificial wetland system, the sludge generated in the sedimentation tank needs to be cleaned regularly. In order to ensure the continuous operation of the artificial wetland system during the cleaning process, the sedimentation tank in the surface flow area is selected in a "one use and one standby" mode, that is, when one sedimentation tank is cleaned, the other sedimentation tank is started to continue to work. However, the construction of the "one use and one standby" sedimentation tank in the surface flow area requires a site with sufficient width, and for the special topography of mountainous and lake areas, most sites are narrow, which cannot meet the construction needs of the treatment facility. If the width of the sedimentation tank in the surface flow area is reduced, the water flow rate needs to be increased to achieve the same treatment capacity, which causes the generated precipitate to be unable to settle. SUMMARY

[0004] The technical problem to be solved by the present application is: how to realize the "one use and one standby" water distribution mode construction of the sedimentation tank in the surface flow area in the mountainous and lake areas with narrow sites.

[0005] The technical solution of the present application to solve the above technical problem is as follows:

[0006] The present application provides a water distribution device for surface flow pool of constructed wetland, which comprises a water flow channel, and a first water distribution groove, a first sedimentation tank, a second water distribution groove, a second sedimentation tank and a third water distribution groove are sequentially arranged on one side of the water flow channel along the water flow direction of the water flow channel, one end of the first water distribution groove, one end of the second water distribution groove and one end of the third water distribution groove are connected with the water flow channel, a three-way valve A is arranged at the connection position of the first water distribution groove and the water flow channel, and a three-way valve B is arranged at the connection position of the second water distribution groove and the water flow channel.

[0007] The present application has the following beneficial effects:

[0008] The application switches the mine water flowing path in the water flow channel through the three-way valve A and the three-way valve B, and realizes the working mode of one use and one standby of the first sedimentation tank and the second sedimentation tank through the cooperation of the first water distribution groove, the second water distribution groove and the third water distribution groove, so that the continuous operation of the artificial wetland is not affected when the sludge is cleaned; in addition, the first sedimentation tank and the second sedimentation tank are arranged along the water flow direction, are suitable for construction in narrow mountain and lake areas, do not need to reduce the width of the surface flow area sedimentation tank, the flow speed in the sedimentation tank is slow, the treatment capacity is large, and the suspended solids are fully settled.

[0009] Based on the above technical solutions, the application can be further improved as follows.

[0010] Further, a first water distribution wall is arranged between the first water distribution groove and the first sedimentation tank, and a plurality of first water distribution holes are distributed on the first water distribution wall; a first overflow wall is arranged between the first sedimentation tank and the second water distribution groove; a second water distribution wall is arranged between the second water distribution groove and the second sedimentation tank, and a plurality of second water distribution holes are distributed on the upper part of the second water distribution wall; a second overflow wall is arranged between the second sedimentation tank and the third water distribution groove; a third water distribution wall is arranged on the side of the third water distribution groove opposite to the second overflow wall, and a plurality of third water distribution holes are distributed on the third water distribution wall.

[0011] When the first sedimentation tank is enabled, the water in the first water distribution groove enters the first sedimentation tank through the first water distribution holes, and the clarified water overflows the first overflow wall and enters the second water distribution groove; since the second water distribution holes are located higher, the water is prevented from entering the second sedimentation tank, and the cleaning is facilitated; when the second sedimentation tank is enabled, the water level in the second water distribution groove is raised due to the blockage of the three-way valve B, so that the water enters the second sedimentation tank through the second water distribution holes; the second water distribution holes prevent the water from overflowing the first overflow wall and entering the first sedimentation tank; the clarified water overflows the second overflow wall and enters the third water distribution groove, and finally flows out through the third water distribution holes.

[0012] Further, the height of the first overflow wall is lower than the height of the other two opposite side walls of the first sedimentation tank.

[0013] The clarified water in the first sedimentation tank is prevented from overflowing the other two opposite side walls of the first sedimentation tank and entering the water flow channel.

[0014] Further, the height of the second overflow wall is lower than the height of the other two opposite side walls of the second sedimentation tank.

[0015] The clarified water in the second sedimentation tank is prevented from overflowing the other two opposite side walls of the second sedimentation tank and entering the water flow channel.

[0016] Further, the first water distribution holes are arranged in rows along the horizontal direction, and at least one row of the first water distribution holes is arranged in the middle region of the first water distribution wall.

[0017] The first water distribution hole ensures that the mine water forms a planar surface flow when entering the first sedimentation tank, and avoids disturbing the sludge at the bottom of the first sedimentation tank, thereby ensuring the sedimentation of suspended solids.

[0018] Further, the third water distribution holes are arranged in rows along the horizontal direction, and at least one row of the third water distribution holes is arranged in the lower region of the third water distribution wall.

[0019] The third water distribution hole ensures that the water in the third water distribution wall flows out in time to avoid water level rise; at the same time, it ensures that the water flow enters the subsurface flow area of the constructed wetland in a planar surface flow, thereby facilitating full reaction.

[0020] The application also provides a constructed wetland, which comprises a subsurface flow area, a filter area, a deep filter area, a clean water tank and the above-mentioned water distribution device of the constructed wetland surface flow tank, the subsurface flow area is arranged on the side of the third water distribution wall away from the third water distribution tank, and the subsurface flow area, the filter area, the deep filter area and the clean water tank are arranged in sequence along the direction away from the third water distribution tank.

[0021] After the mine water is deposited in the first sedimentation tank or the second sedimentation tank, it flows into the subsurface flow area through the third water distribution tank for deep reaction to remove metal ions, then is filtered through the filter area and the deep filter area, and finally enters the clean water tank, thereby achieving standard discharge. The acid mine water is treated quickly and conveniently, the operation efficiency is greatly improved, the operation cost is low, and the maintenance is convenient.

[0022] Further, the subsurface flow area is filled with alkaline materials, the filter area is filled with manganese sand, and the deep filter area is filled with volcanic rock.

[0023] The manganese sand and the volcanic rock are sequentially filtered to facilitate full removal of suspended solids, thereby achieving standard discharge.

[0024] Further, a plurality of first baffles and a plurality of second baffles are arranged in the subsurface flow area, the first baffles and the second baffles are arranged in a staggered manner along the water flow direction in the subsurface flow area, a first water passage is arranged in the upper portion of the first baffle, and a second water passage is arranged in the lower portion of the second baffle.

[0025] The mine water forms a W-shaped flow channel in the subsurface flow area, thereby facilitating full deep reaction.

[0026] Further, the end of the subsurface flow area along the water flow direction is the second baffle, and the second water passage of the second baffle is connected to the filter area.

[0027] The mine water after deep reaction enters the filter area from the bottom, thereby improving the filtering effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structural schematic diagram of the working state of the first sedimentation tank of the application.

[0029] Figure 2 The structural schematic diagram of the working state of the second sedimentation tank of the application.

[0030] Figure 3 The structural schematic diagram of the constructed wetland of the application.

[0031] In the drawings, the technical features represented by the respective reference signs are as follows:

[0032] 1-water flow channel; 2-first water distribution groove; 3-first sedimentation tank; 4-second water distribution groove; 5-second sedimentation tank; 6-third water distribution groove; 7-three-way valve A; 8-three-way valve B; 9-first water distribution wall; 10-first water distribution hole; 11-first overflow wall; 12-second water distribution wall; 13-second water distribution hole; 14-second overflow wall; 15-third water distribution wall; 16-third water distribution hole; 17-underflow area; 18-filtration area; 19-deep filtration area; 20-clean water tank; 21-first baffle; 22-second baffle; 23-first water outlet; 24-second water outlet. DETAILED DESCRIPTION

[0033] The principles and features of the application are described below, and the examples are only used to explain the application and are not used to limit the scope of the application.

[0034] The application refers to Figures 1-3 .

[0035] Example 1:

[0036] The application provides a water distribution device for a surface flow tank of a constructed wetland, which comprises a water flow channel 1, wherein a first water distribution groove 2, a first sedimentation tank 3, a second water distribution groove 4, a second sedimentation tank 5 and a third water distribution groove 6 are sequentially arranged on one side of the water flow channel 1 along the water flow direction of the water flow channel 1, one end of the first water distribution groove 2, one end of the second water distribution groove 4 and one end of the third water distribution groove 6 are all connected with the water flow channel 1, a three-way valve A 7 is arranged at the connection position of the first water distribution groove 2 and the water flow channel 1, and a three-way valve B 8 is arranged at the connection position of the second water distribution groove 4 and the water flow channel 1.

[0037] Principle:

[0038] The application focuses on the surface flow area application of the constructed wetland. After the mine water is added with the reaction medium, the generated suspended matter cannot be settled due to the fast water flow rate. Therefore, the water distribution tank is arranged. The water flows into the first sedimentation tank 3 or the second sedimentation tank 5 through the first water distribution tank 2 or the second water distribution tank 4, forms the planar surface flow in the sedimentation tank, the water flow area is large, the flow rate is slow, and the settlement of the suspended matter is facilitated. Finally, the water flows into the subsurface flow area 17 of the constructed wetland through the third water distribution tank 6 for deep reaction. The sludge generated in the process needs to be cleaned regularly. Therefore, the first sedimentation tank 3 and the second sedimentation tank 5 are in a one-to-one standby working mode. One is cleaned, and the other is used. The working process of each state is controlled through the three-way valve A7 and the three-way valve B8. The following is the working process description of each state.

[0039] 1. The state of enabling the first sedimentation tank 3 and disabling the second sedimentation tank 5: as shown in the figure, Figure 1 the three-way valve A7 is switched to the channel along the water flow channel 1 to the first water distribution tank 2, and the three-way valve B8 is switched to the channel along the second water distribution tank 4 to the water flow channel 1. After the mine water flows into the first water distribution tank 2 through the three-way valve A7, it flows into the first sedimentation tank 3 through one side wall of the first water distribution tank 2. After the water level in the first sedimentation tank 3 rises, the planar surface flow is formed, the suspended matter is settled, and then the surface clarified water overflows from one side wall of the first sedimentation tank 3 into the second water distribution tank 4. The water level of the second water distribution tank 4 does not need to be raised, but directly flows to the third water distribution tank 6 along the three-way valve B8, the water flow channel 1, and the end close to the third water distribution tank 6, and finally flows out through one side wall of the third water distribution tank 6 and flows into the subsurface flow area 17 of the constructed wetland.

[0040] 2. The state of disabling the first sedimentation tank 3 and enabling the second sedimentation tank 5: as shown in the figure, Figure 2 the three-way valve A7 is switched to the channel along the water flow channel 1, and the three-way valve B8 is switched to the channel along the water flow channel 1 to the second water distribution tank 4. The mine water directly flows to the three-way valve B8 node through the three-way valve A7, and then flows to the second water distribution tank 4 through the three-way valve B8. After the water level of the second water distribution tank 4 rises, it flows into the second sedimentation tank 5 through one side wall of the second water distribution tank 4. After the water level in the second sedimentation tank 5 rises, the planar surface flow is formed, the suspended matter is settled, and then the surface clarified water overflows from one side wall of the second sedimentation tank 5 into the third water distribution tank 6. Finally, it flows out through one side wall of the third water distribution tank 6 and flows into the subsurface flow area 17 of the constructed wetland.

[0041] Note: The position of the water flow channel 1 connecting the first water distribution tank 2 and the second water distribution tank 4 can adopt a pipeline. Correspondingly, the three-way valve A7 and the three-way valve B8 can adopt a three-way valve. In addition, the position of the water flow channel 1 connecting the first water distribution tank 2 and the second water distribution tank 4 can also adopt a water channel. Correspondingly, the three-way valve A7 and the three-way valve B8 can adopt a three-way gate.

[0042] In summary, by using the present application, the mine water flow path in the water flow channel 1 is switched through the three-way valve A7 and the three-way valve B8, and the first water distribution tank 2, the second water distribution tank 4 and the third water distribution tank 6 are matched to realize the working mode of one use and one standby of the first sedimentation tank 3 and the second sedimentation tank 5, which does not affect the continuous operation of the constructed wetland when the sludge is cleaned. In addition, the first sedimentation tank 3 and the second sedimentation tank 5 are arranged along the water flow direction, which is suitable for construction in narrow mountainous and lake areas, and the width of the surface flow zone sedimentation tank does not need to be reduced. The flow speed in the sedimentation tank is slow, and the treatment capacity is large, which ensures that the suspended solids are fully settled. The acidic mine water is treated quickly and conveniently, the operation efficiency is greatly improved, the operation cost is low, and the maintenance is convenient.

[0043] Further, a first water distribution wall 9 is arranged between the first water distribution tank 2 and the first sedimentation tank 3, and a plurality of first water distribution holes 10 are distributed on the first water distribution wall 9; a first overflow wall 11 is arranged between the first sedimentation tank 3 and the second water distribution tank 4; a second water distribution wall 12 is arranged between the second water distribution tank 4 and the second sedimentation tank 5, and a plurality of second water distribution holes 13 are distributed on the upper part of the second water distribution wall 12; a second overflow wall 14 is arranged between the second sedimentation tank 5 and the third water distribution tank 6; a third water distribution wall 15 is arranged on the side opposite to the second overflow wall 14 of the third water distribution tank 6, and a plurality of third water distribution holes 16 are distributed on the third water distribution wall 15.

[0044] When the first sedimentation tank 3 is enabled, the water in the first water distribution tank 2 enters the first sedimentation tank 3 through the first water distribution holes 10, and the clarified water overflows the first overflow wall 11 and enters the second water distribution tank 4. Since the second water distribution holes 13 are located higher, the water is prevented from entering the second sedimentation tank 5, which is convenient for cleaning. When the second sedimentation tank 5 is enabled, the water level in the second water distribution tank 4 rises due to the blockage of the three-way valve B8, so that the water enters the second sedimentation tank 5 through the second water distribution holes 13. The second water distribution holes 13 prevent the water from overflowing the first overflow wall 11 and entering the first sedimentation tank 3. The clarified water overflows the second overflow wall 14 and enters the third water distribution tank 6, and finally flows out through the third water distribution holes 16.

[0045] Further, the height of the first overflow wall 11 is lower than the height of the other two opposite side walls of the first sedimentation tank 3.

[0046] Preferably, the height of the first overflow wall 11 is 10 cm lower than the height of the other two opposite side walls of the first sedimentation tank 3. The heights of the first water distribution wall 9, the first overflow wall 11, the second water distribution wall 12 and the second overflow wall 14 can be the same.

[0047] The height of the first overflow wall 11 is lower than the height of the other two opposite side walls of the first sedimentation tank 3.

[0048] Further, the height of the second overflow wall 14 is lower than the height of the other two opposite side walls of the second sedimentation tank 5.

[0049] Preferably, the height of the second overflow wall 14 is 10 cm lower than the height of the other two opposite side walls of the second sedimentation tank 5.

[0050] The clear water in the second sedimentation tank 5 is ensured to overflow along the second overflow wall 14, avoiding the water level of the second sedimentation tank 5 being too high to overflow the other two opposite side walls of the second sedimentation tank 5 and enter the water flow channel 1.

[0051] Further, the first water distribution holes 10 are arranged in rows in the horizontal direction, and at least one row of the first water distribution holes 10 is arranged in the middle region of the first water distribution wall 9.

[0052] The first water distribution holes 10 ensure that the mine water forms a planar surface flow when entering the first sedimentation tank 3, and avoid disturbing the sludge at the bottom of the first sedimentation tank 3, thereby ensuring the sedimentation of suspended solids.

[0053] Further, the third water distribution holes 16 are arranged in rows in the horizontal direction, and at least one row of the third water distribution holes 16 is arranged in the lower region of the third water distribution wall 15.

[0054] The third water distribution holes 16 ensure that the water in the third water distribution wall 15 flows out in time, avoiding the water level rising; at the same time, the water flow enters the subsurface flow area 17 of the constructed wetland in a planar surface flow, facilitating full reaction.

[0055] Embodiment two, as shown in the following table: Figure 3

[0056] The application further provides a constructed wetland, which comprises a subsurface flow area 17, a filter area 18, a deep filter area 19, a clear water tank 20, and the constructed wetland surface flow tank water distribution device, the subsurface flow area 17 is arranged on the side of the third water distribution wall 15 away from the third water distribution groove 6, and the subsurface flow area 17, the filter area 18, the deep filter area 19 and the clear water tank 20 are arranged in sequence in the direction away from the third water distribution groove 6.

[0057] After the mine water is deposited in the first sedimentation tank 3 or the second sedimentation tank 5, the mine water flows into the subsurface flow area 17 through the third water distribution groove 6 to remove metal ions by deep reaction, then the mine water is filtered through the filter area 18 and the deep filter area 19, and finally the mine water enters the clear water tank 20, thereby achieving standard discharge. The acid mine water is treated quickly and conveniently, the operation efficiency is greatly improved, the operation cost is low, and the maintenance is convenient.

[0058] Further, the subsurface flow area 17 is filled with alkaline materials, the filter area 18 is filled with manganese sand, and the deep filter area 19 is filled with volcanic rock.

[0059] Note: The alkaline materials include limestone, periclase, etc. ​

[0060] Conveniently remove metal ions by deep reaction, manganese sand, volcanic rock filter in turn to facilitate the removal of suspended solids, and finally achieve the discharge standard.

[0061] Further, the submerged area 17 is provided with a plurality of first baffles 21 and a plurality of second baffles 22, the first baffles 21 and the second baffles 22 are staggered along the water flow direction in the submerged area 17, the upper part of the first baffle 21 is provided with a first water outlet 23, and the lower part of the second baffle 22 is provided with a second water outlet 24.

[0062] Make the mine water flow in the W-shaped flow channel in the submerged area 17, which facilitates full and deep reaction.

[0063] Further, the end of the submerged area 17 along the water flow direction is the second baffle 22, and the second water outlet 24 of the second baffle 22 is connected to the filter area 18.

[0064] Make the mine water after deep reaction from the bottom into the filter area 18, improve the filtering effect.

[0065] In the description of the present application, it should be understood that if the description of the orientation, direction or position relationship appears, for example: "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The orientation or position relationship indicated in the specification is based on the orientation or position relationship shown in the drawings, and is only for the convenience of understanding the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated part, element or whole must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0066] In addition, if the order description language appears, for example: "first", "second", etc. In the specification, it is used for the convenience of understanding or simplifying the description, for example, in order to distinguish a plurality of technical features of the same type or function, and it is necessary to mention separately, the specification may use the order description language of prefix or suffix to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc. Unless otherwise specifically limited.

[0067] In the present application, if the structural relative action relationship description language is adopted, for example: "mount", "connect", "connect", "fix", etc., unless otherwise specified and limited, it should be understood in a broad sense. For example, "mount", "connect", "connect", etc. can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements; "fixed" can be integrated fixed, or can be detachable fixed through a fastener; can be directly fixed, or can be fixed through an intermediate medium. For those skilled in the art, the specific meaning of the above description language in the present application can be understood according to the specific circumstances, the context, the coherence of the text before and after, etc.

[0068] In the present application, if the description language containing the meaning of attachment or connection appears, for example, the first feature is "on" or "under" the second feature, unless otherwise specified and limited, it should not be limitedly understood, for example, "on" or "under" can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above description language in the present application can be understood according to the specific circumstances, the context, the coherence of the text before and after, etc.

[0069] Further, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0070] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments, examples and features of different embodiments, examples described in the present application without contradiction, which should be included in the scope of the present application.

[0071] Although the embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are merely exemplary and are not to be taken as limiting the present application, and that within the scope of information which can be obtained in the art by those skilled in the art, with the technical inspiration given by the present application document, the above embodiments can be changed, modified, replaced and varied.

Claims

1. A water distribution device for an artificial wetland surface flow pool, characterized by: The invention comprises a water flow channel (1), wherein a first water distribution trough (2), a first sedimentation tank (3), a second water distribution trough (4), a second sedimentation tank (5), and a third water distribution trough (6) are sequentially provided on one side of the water flow channel (1) along the water flow direction of the water flow channel (1); one end of the first water distribution trough (2), one end of the second water distribution trough (4), and one end of the third water distribution trough (6) are all connected to the water flow channel (1); a three-way valve A (7) is provided at the connection between the first water distribution trough (2) and the water flow channel (1); and a three-way valve B (8) is provided at the connection between the second water distribution trough (4) and the water flow channel (1); A first water distribution wall (9) is provided between the first water distribution trough (2) and the first sedimentation tank (3), and a plurality of first water distribution holes (10) are distributed on the first water distribution wall (9); a first overflow wall (11) is provided between the first sedimentation tank (3) and the second water distribution trough (4); a second water distribution wall (12) is provided between the second water distribution trough (4) and the second sedimentation tank (5), and a plurality of second water distribution holes (13) are distributed on the upper part of the second water distribution wall (12); a second overflow wall (14) is provided between the second sedimentation tank (5) and the third water distribution trough (6); a third water distribution wall (15) is provided on the side of the third water distribution trough (6) opposite to the second overflow wall (14), and a plurality of third water distribution holes (16) are distributed on the third water distribution wall (15); The height of the first overflow wall (11) is lower than the heights of the other two opposite side walls of the first sedimentation tank (3); The height of the second overflow wall (14) is lower than the heights of the other two opposite side walls of the second sedimentation tank (5).

2. The artificial wetland surface flow pool water distribution device according to claim 1, characterized in that: The first water distribution holes (10) are distributed in rows along the horizontal direction, and at least one row of first water distribution holes (10) is provided in the middle area of ​​the first water distribution wall (9).

3. The artificial wetland surface flow pool water distribution device according to claim 1, characterized in that: The third water distribution holes (16) are distributed in rows along the horizontal direction, and the lower area of ​​the third water distribution wall (15) is provided with at least one row of third water distribution holes (16).

4. An artificial wetland, characterized by: The invention comprises an underflow area (17), a filtration area (18), a deep filtration area (19), a clear water pool (20), and the artificial wetland surface flow pool water distribution device according to any one of claims 1 to 3, wherein the underflow area (17) is arranged on a side of the third water distribution wall (15) away from the third water distribution trough (6), and the underflow area (17), the filtration area (18), the deep filtration area (19), and the clear water pool (20) are arranged in sequence in a direction away from the third water distribution trough (6).

5. The artificial wetland according to claim 4, characterized in that: The underflow zone (17) is filled with alkaline material, the filtration zone (18) is filled with manganese sand, and the deep filtration zone (19) is filled with volcanic rock.

6. The artificial wetland according to claim 5, characterized in that: A plurality of first baffles (21) and a plurality of second baffles (22) are provided in the subsurface flow area (17). The first baffles (21) and the second baffles (22) are arranged in a staggered manner along the direction of water flow in the subsurface flow area (17). A first water outlet (23) is provided at the upper portion of the first baffle (21), and a second water outlet (24) is provided at the lower portion of the second baffle (22).

7. The artificial wetland according to claim 6, characterized in that: The end of the subsurface flow area (17) along the water flow direction is a second baffle (22), and the second water outlet (24) of the second baffle (22) is connected to the filtration area (18).

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