A subsurface flow constructed wetland system

Abstract

The application discloses a kind of subsurface flow artificial wetland systems, comprising: the water inlet assembly of introducing sewage, the wetland module of purifying sewage, the water outlet assembly of discharging purified water, wetland module includes one or more wetland unit groups, in vertical direction, multiple wetland unit groups are spliced and assembled into wetland module, and sewage flows through wetland unit group to purify treatment.The artificial wetland system of the application realizes modularization by the way similar to building with blocks, realizes preloading, that is, relative to huge artificial wetland system, using one small particle unit, quickly splicing and assembling in horizontal direction, longitudinal direction, vertical direction, to form modular preloading artificial wetland system.

Description

Technical Field

[0001] This invention relates to an artificial wetland, and more specifically, to a subsurface flow artificial wetland system. Background Technology

[0002] Constructed wetlands are artificial ecosystems that simulate natural wetlands. They are man-made, controlled surface water bodies similar to marshes, and primarily utilize the synergistic physical, chemical, and biological processes of soil, artificial media, plants, and microorganisms to treat wastewater and sludge. Constructed wetlands introduce wastewater and sludge that flows in a specific direction, where they are treated through the combined action of the packing material and plants. Subsurface flow constructed wetlands, on the other hand, place wastewater below the packing material layer. The wastewater flows slowly horizontally within the packing bed, where pollutants are removed through the biofilm growing on the packing surface, the abundant plant roots, and the trapping effect of the packing material.

[0003] Existing technology CN208948967U discloses a modular constructed wetland integrated device, including a modular sedimentation tank, an ecological purification and filtration tank, and a clear water tank. The sedimentation tank includes a first prefabricated caisson with a first partition inserted in the middle. An arc-shaped sand and gravel filter screen is installed on the top of the first prefabricated caisson, and damping nets are evenly spaced on the inner wall. The ecological purification and filtration tank includes a second prefabricated caisson, with a second partition dividing it into a filtration tank and a biological purification tank. The clear water tank includes a third prefabricated caisson. This device can prevent sediment from entering the system and causing difficulties in later cleaning, has good water storage capacity, maintains water supply to aquatic plants, and prevents a decline in the wastewater treatment capacity of the constructed wetland system. However, this traditional subsurface flow constructed wetland project has an excessively long overall construction period, high maintenance costs during operation, and is difficult to maintain.

[0004] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0005] The main objective of this invention is to provide a subsurface flow constructed wetland system that can significantly shorten the construction period.

[0006] To achieve the above objectives, the present invention provides a subsurface flow constructed wetland system comprising: an inlet component for introducing wastewater, a wetland module for purifying wastewater, and an outlet component for discharging purified water. The wetland module comprises one or more wetland unit groups, which are assembled vertically to form the wetland module. Wastewater flows through the wetland unit groups for purification.

[0007] Further, the wetland module comprises two layers of wetland unit groups, which are divided into a surface layer wetland unit group and a bottom layer wetland unit group; or the wetland module comprises three layers of wetland unit groups, which are divided into a surface layer wetland unit group, a middle layer wetland unit group and a bottom layer wetland unit group, in the vertical direction, the surface layer wetland unit group is above the middle layer wetland unit group, and the middle layer wetland unit group is above the bottom layer wetland unit group.

[0008] Further, in the vertical direction, the sewage flows through the surface layer wetland unit group, the middle layer wetland unit group and the bottom layer wetland unit group in sequence, the surface layer wetland unit group comprises a plurality of first wetland units, in the horizontal direction and / or the longitudinal direction, the plurality of first wetland units are arranged adjacently and assembled into the surface layer wetland unit group, and the first wetland unit can be pre-assembled before construction; or the middle layer wetland unit group comprises a plurality of second wetland units, in the horizontal direction and / or the longitudinal direction, the plurality of second wetland units are arranged adjacently and assembled into the middle layer wetland unit group, and the second wetland unit can be pre-assembled before construction; or the bottom layer wetland unit group comprises a plurality of third wetland units, in the horizontal direction and / or the longitudinal direction, the plurality of third wetland units are arranged adjacently and assembled into the bottom layer wetland unit group, and the third wetland unit can be pre-assembled before construction. A new artificial wetland construction system is provided, which is modularized and pre-assembled in a way similar to building with blocks, that is, a small particle unit is used, which is quickly assembled in the horizontal, longitudinal and vertical directions, so as to form a modularized and pre-assembled artificial wetland system.

[0009] Further, the first wetland unit is filled with surface layer filler and / or plants, and the surface layer filler is sand, planting soil suitable for plant growth.

[0010] Further, the second wetland unit is filled with middle layer filler, and the middle layer filler is volcanic rock, zeolite or anthracite with adsorption property.

[0011] Further, the third wetland unit is filled with bottom layer filler, and the bottom layer filler is filler with water permeability to prevent the bottom of the wetland bed from being blocked.

[0012] Further, in the horizontal direction, the wetland module comprises a water inlet area, a purification area and a water outlet area in sequence, and the sewage flows through the water inlet area, the purification area and the water outlet area in sequence in the horizontal direction.

[0013] Further, the water inlet area comprises a plurality of water inlet units, and the plurality of water inlet units are arranged adjacently and assembled into the water inlet area in one or more of the vertical direction, the horizontal direction and the longitudinal direction; the water outlet area comprises a plurality of water outlet units, and the plurality of water outlet units are arranged adjacently and assembled into the water outlet area in one or more of the vertical direction, the horizontal direction and the longitudinal direction, and the water inlet unit or the water outlet unit is filled with water permeable filler.

[0014] Further, the purification area is divided into a first purification area and a second purification area, and the first purification area is located above the second purification area in the vertical direction.

[0015] Further, the first purification area comprises a plurality of first purification units, and the plurality of first purification units are arranged adjacently and assembled into the first purification area in the horizontal direction and / or the vertical direction, and the first purification units accommodate plants and / or fillers.

[0016] Further, in the horizontal direction, the second purification area comprises an adsorption area, a first core area and a second core area; the adsorption area comprises a plurality of second purification units, and the plurality of second purification units are arranged adjacently and assembled into the adsorption area in the horizontal direction and / or the vertical direction, and the second purification units accommodate adsorption fillers; the first core area comprises a plurality of third purification units, and the plurality of third purification units are arranged adjacently and assembled into the first core area; and the second core area comprises a plurality of fourth purification units, and the plurality of fourth purification units are arranged adjacently and assembled into the second core area.

[0017] Further, the third purification units accommodate nitrogen-removing fillers and / or the fourth purification units accommodate phosphorus-removing fillers. Such a plurality of subareas are arranged, so that the fillers can be accurately proportioned, and a good sewage purification effect can be achieved in a targeted and step-by-step manner.

[0018] The technical scheme of the present application at least has the following beneficial effects:

[0019] 1. The subsurface constructed wetland system solves the problem of long overall construction period of the traditional subsurface constructed wetland;

[0020] 2. The problem that the fillers cannot be accurately proportioned during the construction of the traditional subsurface constructed wetland is solved;

[0021] 3. The problem that the traditional subsurface constructed wetland cannot be installed in detail is solved;

[0022] 4. The problem that the maintenance cost is high and the maintenance is difficult after the traditional subsurface constructed wetland is blocked during the operation period is solved;

[0023] 5. The problem that the traditional subsurface constructed wetland cannot use soft fillers is solved;

[0024] 6. The problem that the traditional subsurface constructed wetland is difficult to repair after local blockage and short flow is solved;

[0025] 7. The problem that the traditional subsurface constructed wetland damages the surface plants during the maintenance of the bottom pipeline and the fillers is solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0027] Figure 1 A first case schematic view of a modular constructed wetland embodiment is shown;

[0028] Figure 2 A second case schematic view of a modular constructed wetland embodiment is shown;

[0029] Figure 3 A partial enlarged view of Figure 2 is shown;

[0030] Figure 4 A structural schematic view of a plant unit is shown;

[0031] Figure 5 A structural schematic view of an adsorption filler unit is shown;

[0032] Figure 6 A structural schematic view of a water-permeable filler unit is shown;

[0033] Figure 7 A second case schematic view of a modular constructed wetland embodiment is shown.

[0034] Among the above drawings, the following reference signs are included:

[0035] 1, surface wetland unit group; 2, plant unit; 3, first frame;

[0036] 4, middle layer wetland unit group; 5, bottom layer wetland unit group; 6, adsorption filler unit; 7, second frame;

[0037] 8, second core area; 9, groove; 10, water-permeable filler unit; 11, first purification area; 12, adsorption area; 13, first core area; 14, water inlet area; 15, water outlet area;

[0038] X, transverse direction; Y, longitudinal direction; Z, vertical direction; a, vertical water flow direction; b, horizontal water flow direction. DETAILED DESCRIPTION

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] The application will be described in further detail below with reference to the specific embodiments, which should not be understood as limiting the scope of the application claimed. The term "comprising" is used in the sense that there are features present, but it does not exclude the presence or addition of one or more other features; the terms "transverse", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application; in addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In addition, in the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0042] The traditional artificial wetland has problems of long overall construction period, high operation and maintenance cost, inability to ensure accurate proportioning of fillers, and inability to realize fine installation. In order to solve the above problems, the present application provides a new artificial wetland construction system, which realizes modularization and preinstallation by building in a way similar to building blocks, that is, a small particle unit is used for the large artificial wetland system, which is quickly spliced and assembled in the transverse, longitudinal and vertical directions, thereby forming a modular preinstalled artificial wetland system. The small particle unit can be preinstalled through flow production, which eliminates the on-site construction and assembly link and avoids the influence of various uncertain factors such as construction site, thereby greatly shortening the construction period.

[0043] Specifically, the subsurface flow constructed wetland system of the present application comprises a water inlet assembly for introducing sewage, a wetland module for purifying the sewage, and a water outlet assembly for discharging the purified water. The wetland module comprises one or more wetland unit groups, and the multiple wetland unit groups are assembled into the wetland module in the vertical direction Z, and the sewage flows through the wetland unit groups for purification. The wetland module can comprise two wetland unit groups, which are divided into a surface layer wetland unit group 1 and a bottom layer wetland unit group 5. According to actual conditions, the wetland module can also comprise three wetland unit groups, which are divided into a surface layer wetland unit group 1, a middle layer wetland unit group 4, and a bottom layer wetland unit group 5. In the vertical direction Z, the surface layer wetland unit group 1 is above the middle layer wetland unit group 4, and the middle layer wetland unit group 4 is above the bottom layer wetland unit group 5.

[0044] The water inlet assembly performs primary purification of the introduced sewage through the surface layer wetland unit group 1, and then performs secondary purification and tertiary purification through the middle layer wetland unit group 4 and the bottom layer wetland unit group 5.

[0045] The constructed wetland system of the present application comprises a vertical flow modular pre-assembled constructed wetland and a horizontal flow modular pre-assembled constructed wetland. For the vertical flow modular pre-assembled constructed wetland system, the sewage flows in a vertical flow state from top to bottom in the filler, and the water flow is collected by the water outlet assembly laid at the bottom of the water outlet end after flowing through the filler and then discharged. For the horizontal flow modular pre-assembled constructed wetland system, the sewage flow flows through the filler and plant roots in the process of flowing along the horizontal direction X from one end of the water inlet assembly to the water outlet assembly.

[0046] Embodiment one

[0047] For the vertical flow modular pre-assembled constructed wetland of embodiment one, it comprises a water inlet assembly for introducing sewage, a wetland module for purifying the sewage, and a water outlet assembly for discharging the purified water. The water inlet assembly is arranged at the upper part of the wetland module and is used to uniformly distribute the sewage in the wetland module so that the sewage is purified after passing through the wetland module. The wetland module comprises at least one surface layer wetland unit group 1, and the wetland unit group comprises a plurality of wetland units. In the horizontal direction X and the vertical direction Y, the plurality of wetland units are arranged adjacently and assembled into a wetland unit group, or the plurality of wetland units are arranged and assembled into a wetland unit group only in the horizontal direction X or the vertical direction Y. That is, the wetland unit group extends in the horizontal direction X and the vertical direction Y, or extends only in the horizontal direction X or the vertical direction Y.

[0048] In the vertical direction Z, at least one wetland unit group is arranged, and according to engineering needs, two wetland unit groups or three wetland unit groups can also be arranged. The subsurface flow constructed wetland system of the present application adopts a small wetland unit, which can be assembled before construction, without the need for on-site installation, thereby greatly improving the overall construction period. The modular pre-assembled design solves the problem of long overall construction period of traditional subsurface flow constructed wetlands.

[0049] As shown in Figures 1-3 , in the vertical direction Z, the wetland module includes a surface layer wetland unit group 1, a middle layer wetland unit group 4 and a bottom layer wetland unit group 5. Figure 1 The vertical flow direction a is shown, and the sewage flows through the surface layer wetland unit group 1, the middle layer wetland unit group 4 and the bottom layer wetland unit group 5 in turn, the surface layer wetland unit group 1 includes a plurality of first wetland units, which are arranged adjacently and assembled into the surface layer wetland unit group 1 in the lateral direction X and / or the longitudinal direction Y, and the first wetland units can be pre-assembled before construction. The middle layer wetland unit group 4 can also include a plurality of second wetland units, which are arranged adjacently and assembled into the middle layer wetland unit group 4 in the lateral direction X and / or the longitudinal direction Y, and the second wetland units can be pre-assembled before construction. The bottom layer wetland unit group 5 can also include a plurality of third wetland units, which are arranged adjacently and assembled into the bottom layer wetland unit group 5 in the lateral direction X and / or the longitudinal direction Y, and the third wetland units can be pre-assembled before construction.

[0050] The wetland unit group can be installed in a single wetland pond of several square meters to several thousand square meters, and a general large-scale wetland is composed of a plurality of 500-2000 square meter wetland ponds. The way of splicing the wetland unit into the wetland unit group greatly shortens the overall construction period.

[0051] The first wetland unit is filled with surface layer filler and / or plants, and the surface layer filler is sand and gravel suitable for plant growth, planting soil, which is a plant unit, as shown in Figure 4 . The second wetland unit is filled with middle layer filler, and the middle layer filler is volcanic rock, zeolite and anthracite with adsorption, which is an adsorption filler unit 6, as shown in Figure 5 . The third wetland unit is filled with bottom layer filler, and the bottom layer filler is filler with water permeability to prevent the bottom of the wetland bed from being blocked, which is a water permeable filler unit 10, as shown in Figure 6 . That is, the surface layer wetland unit group 1 is formed by splicing a plurality of plant units in the lateral and longitudinal directions, the middle layer wetland unit group 4 is formed by splicing a plurality of adsorption filler units 6 in the lateral and longitudinal directions, and the bottom layer wetland unit group 5 is formed by splicing a plurality of water permeable filler units 10 in the lateral and longitudinal directions. Among them, the surface layer wetland unit group 1 can also be formed by splicing a plurality of plant units 2 and a plurality of adsorption filler units 6 in the lateral and longitudinal directions.

[0052] For this embodiment, there are three cases in the construction and installation process.

[0053] For the first case, as shown in Figure 1As shown, the subsurface constructed wetland system only lays the surface layer wetland unit group 1 on the surface layer. The surface layer wetland unit group 1 includes a plurality of plant units 2, the plant unit 2 includes a first frame 3, plants are planted inside the first frame 3 to form the plant unit 2; and the water inlet assembly for introducing sewage is arranged above the plurality of first frames 3, and the plurality of first frames 3 provide support for the water inlet assembly. Below the plant unit 2, the traditional filler module is still used. This installation method of installing the plant unit 2 only on the surface layer is more suitable for the modification of the traditional constructed wetland. The first frame 3 can be a cube, a cuboid or a regular connectable geometric object.

[0054] The water inlet assembly is a circular intercommunicating pipeline, and a 45-degree inclined hole is formed in the pipeline. The water inlet assembly is arranged above the plant unit 2 in the transverse direction X and the longitudinal direction Y. The distributed arrangement of the arrangement assembly ensures that the sewage can uniformly flow into each plant unit 2.

[0055] The plant unit 2 includes the first frame 3, which can realize pre-planting of plants, can eliminate on-site planting and maintenance of wetland plants, and can eliminate the problem of low survival rate of wetland plants caused by the short window period after wetland construction and before water inlet. In addition, the problem of plant diseases and insect pests can be controlled when the wetland module is pre-installed, reducing the difficulty of construction site work. On the other hand, the main clogging of the wetland system during operation is the clogging of the surface layer of the wetland. This installation method can quickly remove the specified part of the surface layer unit for cleaning or replacement of the plant unit 2, reducing the operation cost of the wetland and the difficulty of operation and maintenance. When cleaning or replacing the surface layer plant unit 2, compared with the traditional wetland, the accumulated material in the surface layer filler can be prevented from flowing into the middle layer or lower layer to clog the wetland, greatly improving the convenience and risk control of wetland repair after clogging.

[0056] For the second case, the wetland module further includes a bottom layer wetland unit group 5. According to actual engineering needs, it can also include a middle layer wetland unit group 4, as shown in Figure 2 、 Figure 3 of course, the filler module can also include three filler unit groups, and the more the number of filler groups, the better the sewage purification effect, but the setting of the number of filler groups is also related to the cost and actual needs of the project. The installation method of the second case of the present embodiment is a complete wetland unit installation method, which is used for internal installation of the wetland pool body.

[0057] The second case is described by including a surface layer wetland unit group 1, a middle layer wetland unit group 4, and a bottom layer wetland unit group 5, as shown in Figures 2-3The surface wetland unit group 1 is located above the middle layer wetland unit group 4 in the vertical direction Z, and the bottom layer wetland unit group 5 is located below the middle layer wetland unit group 4. For the middle layer wetland unit group 4 and the bottom layer wetland unit group 5, a plurality of adsorption filler units 6 and a plurality of water-permeable filler units 10 are arranged respectively. The adsorption filler unit 6 and the water-permeable filler unit 10 each include a second frame body 7, and the second frame body 7 contains filler to form the adsorption filler unit 6. The second frame body 7 can be a cube, a cuboid or a regular connectable geometric object.

[0058] Since the adsorption filler unit 6 and the water-permeable filler unit 10 contain filler through the second frame body 7, the filler is supported by the second frame body 7. Based on the strength and support structure of the second frame body 7, the filler in the second frame body 7 can use soft filler without being compressed in volume by the filler above due to gravity. The middle layer wetland unit group 4 and the bottom layer wetland unit group 5 use the method of installing filler in the frame body, which provides more space for the selection of artificial wetland filler, so that the artificial wetland can use soft filler and the like.

[0059] Specifically, as shown in Figure 5 The adsorption filler unit 6 and the water-permeable filler unit 10 can be preloaded with subsurface flow wetland filler, and can be layered preloaded with single filler of the same particle size or different particle sizes; or layered preloaded with multiple wetland fillers of different particle sizes or the same particle size or non-subsurface flow wetland soft filler. The types of fillers mainly include conventional fillers such as zeolite, gravel, volcanic rock, ceramsite, fly ash, vermiculite, coal gangue, anthracite, coarse sand, quartz sand, ceramic ball, clay, shale and other commonly used subsurface flow artificial wetland fillers; or special wetland fillers such as carrier microbial filler and slow-release carbon source filler.

[0060] The second case can achieve accurate proportioning of fillers by arranging the middle layer wetland unit group 4 and the bottom layer wetland unit group 5. Different fillers arranged in the middle layer wetland unit group 4 and the bottom layer wetland unit group 5 can achieve fine installation of the artificial wetland.

[0061] When installing the second case of the artificial wetland system, the water-permeable filler units 10 are first tightly connected in the horizontal direction X or the vertical direction Y to form the bottom layer wetland unit group 5. The adsorption filler units 6 are tightly connected to form the middle layer wetland filler group 4 based on the bottom layer wetland unit group 5, and then the plant units 2 are laid on the middle layer wetland filler group 4, and the water inlet assembly is laid on the plant units 2. The sewage is evenly distributed on each plant unit 2 through the water inlet assembly, and then purified through the middle layer wetland unit group 4 and the bottom layer wetland unit group 5 in the vertical direction Z, and finally discharged through the water outlet assembly below the bottom layer wetland unit group 5.

[0062] The water outlet assembly is arranged below the bottom layer wetland unit group 5, and includes a total water collecting pipe and a sub water collecting pipe, wherein the sub water collecting pipe is assembled into the total water collecting pipe. That is, the sub water collecting pipe is in segments, and the sub water collecting pipe can be conveniently disassembled by disassembling the water permeable filler unit 10. This design is beneficial for maintenance after the artificial wetland is blocked during operation. The problem of local blockage and short flow can be quickly solved by replacing the blocked water permeable filler unit 10, and the problem of difficult maintenance after blockage is solved. When the water permeable filler unit 10 is locally maintained, the plant unit 2 can also be removed, which avoids damage to the surface layer of plants caused by maintenance of the bottom layer water permeable filler unit 10. This wetland can realize small area maintenance, and only the corresponding area module needs to be lifted out for operation, without the need for large area excavation and damage to the surface layer of plants and the structure of the wetland filler layer.

[0063] Specifically, the sub water collecting pipe can be a groove 9 below the second frame body 7, and the second frame body 7 includes at least two grooves 9. Of course, the second frame body 7 can also be provided with only one groove 9 as a sub water collecting pipe. In the second embodiment, the grooves 9 below the second frame body 7 can form a total water collecting pipe by splicing, without the need for additional pipeline laying in the bottom layer of the artificial wetland, thereby saving construction cost.

[0064] For the second case, different specifications of fillers can be pre-installed in the middle layer wetland unit group 4 and the bottom layer wetland unit group 5, so as to achieve the purpose of layered installation of fillers, and the height of each layer of fillers can be strictly controlled, thereby reducing construction difficulty and improving controllability of construction quality.

[0065] The plant unit, the adsorption filler unit 6 and the water permeable filler unit 10 in the first case and the second case adopt a pre-installed mode, that is, the plants are planted in the first frame body 3 before construction, and the adsorption filler or the water permeable filler is placed in the second frame body 7.

[0066] For the third case, the first frame body 3 and the second frame body 7 can also be installed on site, and then the fillers or plants are laid.

[0067] Embodiment two

[0068] For the horizontal flow modular pre-installed artificial wetland, the above-mentioned small particle unit assembly method can also achieve the control method of different specifications of fillers in different partitions, that is, different partitions are arranged in the horizontal direction X and the vertical direction Y, so as to realize precise control of sewage purification.

[0069] Figure 7 The horizontal flow direction b is shown, and the wetland module sequentially includes a water inlet area 14, a purification area and a water outlet area 15 in the horizontal direction X. The sewage flows through the purification area from the water inlet area 14 in the horizontal direction X, and then is discharged from the water outlet area 15.

[0070] The water inlet area 14 comprises a plurality of water inlet units, which are arranged adjacently and assembled into the water inlet area 14 in one or more of the vertical direction Z, the lateral direction X and the longitudinal direction Y; the water outlet area 15 comprises a plurality of water outlet units, which are arranged adjacently and assembled into the water outlet area 15 in one or more of the vertical direction Z, the lateral direction X and the longitudinal direction Y, and the water inlet unit or the water outlet unit is filled with water-permeable filler.

[0071] The purification area is divided into a first purification area 11 and a second purification area, and the first purification area 11 is located above the second purification area in the vertical direction Z. The first purification area 11 comprises a plurality of first purification units, which are arranged adjacently and assembled into the first purification area 11 in the lateral direction X and / or the longitudinal direction Y, and the first purification unit contains plants, filler suitable for plant growth, such as sand and planting soil. The plant roots planted in the first purification unit can purify pollutants in the sewage, and also provide ideal attachment points to adjust the microbial community.

[0072] In the lateral direction X, the second purification area comprises an adsorption area 12, a first core area 13 and a second core area 8. The adsorption area 12 comprises a plurality of second purification units, which are arranged adjacently and assembled into the adsorption area 12 in the lateral direction and / or the longitudinal direction, and the second purification unit contains adsorption filler, which is mainly used for adsorbing pollutants in the sewage. The first core area 13 comprises a plurality of third purification units, which are arranged adjacently and assembled into the first core area 13, and the third purification unit contains nitrogen removal filler, which removes harmful substances such as nitrogen in the water flow treated by the second purification unit. The second core area 8 comprises a plurality of fourth purification units, which are arranged adjacently and assembled into the second core area 8, and the fourth purification unit contains phosphorus removal filler, which removes harmful substances such as phosphorus in the water flow treated by the third purification unit. Such multiple partition settings realize accurate filler proportioning, purposeful and step-by-step removal of pollutants, nitrogen and phosphorus in the sewage, and achieve good sewage purification effect.

[0073] In summary, from the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0074] 1. The subsurface constructed wetland system of the present application solves the problem of long overall construction period of traditional subsurface constructed wetlands;

[0075] 2. The problem of inaccurate filler proportioning during construction of traditional subsurface constructed wetlands is solved;

[0076] 3. The problem of inability to fine installation of traditional subsurface constructed wetlands is solved;

[0077] 4. The problem of high maintenance cost and difficulty after clogging in the operation period of traditional subsurface flow constructed wetland is solved;

[0078] 5. The problem of inability to use soft filler in traditional subsurface flow constructed wetland is solved;

[0079] 6. The problem of difficulty in repairing partial clogging and short flow in traditional subsurface flow constructed wetland is solved;

[0080] 7. The problem of damage to surface plants during maintenance of bottom pipe and filler in traditional subsurface flow constructed wetland is solved.

[0081] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A subsurface flow constructed wetland system, comprising: Introduction The wastewater inlet assembly, the wastewater purification wetland module, and the purified water outlet assembly are characterized in that the wetland module comprises one or more wetland unit groups, which are assembled vertically to form a wetland module. The wastewater flows through the wetland unit groups for purification. The wetland module comprises two wetland unit groups, which are divided into a surface wetland unit group (1) and a bottom wetland unit group (5); or the wetland module comprises three wetland unit groups, which are divided into a surface wetland unit group (1), a middle wetland unit group (4), and a bottom wetland unit group (5). In the vertical direction, the surface wetland unit group (1) is above the middle wetland unit group (4), and the middle wetland unit group (4) is above the bottom wetland unit group (5). In the vertical direction, the wastewater flows sequentially along the surface wetland unit group (1), the middle wetland unit group (4), and the bottom wetland unit group (5). The surface wetland unit group (1) contains... The wetland unit group (4) comprises multiple first wetland units, which are arranged adjacently and assembled in the horizontal and / or vertical directions to form a surface wetland unit group (1). The first wetland units can be pre-assembled before construction. Or the middle wetland unit group (4) comprises multiple second wetland units, which are arranged adjacently and assembled in the horizontal and / or vertical directions to form a middle wetland unit group (4). The second wetland units can be pre-assembled before construction. Or the bottom wetland unit group (5) comprises multiple third wetland units, which are arranged adjacently and assembled in the horizontal and / or vertical directions to form a bottom wetland unit group (5). The third wetland units can be pre-assembled before construction. The wetland units are smaller in size and can be assembled before construction without on-site installation. The rapid splicing and assembly in the horizontal, vertical and three directions forms a modular prefabricated artificial wetland system, which greatly improves the overall construction cycle. In the horizontal direction, the wetland module sequentially includes an inlet area (14), a purification area, and an outlet area (15), and the wastewater flows sequentially through the inlet area (14), the purification area, and the outlet area (15) in the horizontal direction; the purification area is divided into a first purification area (11) and a second purification area, and in the vertical direction, the first purification area (11) is located above the second purification area; in the horizontal direction, the second purification area includes an adsorption area (12), a first core area (13), and a second core area (8); the adsorption area (12) includes multiple second purification units, and in the horizontal and / or vertical directions, multiple second purification units are arranged adjacently and assembled to form the adsorption area (12), and the second purification units contain adsorption packing material; the first core area (13) includes multiple third purification units, and multiple third purification units are arranged adjacently and assembled to form the first core area (13); the second core area (8) includes multiple fourth purification units, and multiple fourth purification units are arranged adjacently and assembled to form the second core area (8). The first wetland unit of the surface wetland unit group (1) includes multiple plant units (2), each plant unit (2) includes a first frame (3), which is a regular, combinable geometric object; the second wetland unit of the middle wetland unit group (4) and the third wetland unit of the bottom wetland unit group (5) are respectively provided with multiple adsorption filler units (6) and multiple permeable filler units (10), each adsorption filler unit (6) and permeable filler unit (10) includes a second frame (7), which is a regular, combinable geometric object, and the filler inside the second frame (7) can be a soft filler; The water outlet assembly includes a main water inlet pipe and branch water inlet pipes, which are assembled into the main water inlet pipe. The branch water inlet pipes are the grooves (9) under the second frame (7).

2. The subsurface flow constructed wetland system according to claim 1, characterized in that, The first wetland unit is filled with a surface filler and / or plants, wherein the surface filler is sand, gravel, or planting soil suitable for plant growth.

3. The subsurface flow constructed wetland system according to claim 2, characterized in that, The second wetland unit is filled with an intermediate layer of filler material, which is volcanic rock, zeolite, or anthracite with adsorption properties.

4. The subsurface flow constructed wetland system according to claim 3, characterized in that, The third wetland unit is filled with a bottom layer of filler material, which is a permeable filler material to prevent blockage at the bottom of the wetland bed.

5. The subsurface flow constructed wetland system according to claim 1, characterized in that, The water inlet area (14) includes multiple water inlet units, which are arranged adjacently and assembled in one or more directions of the vertical direction, the horizontal direction, and the longitudinal direction to form the water inlet area (14); the water outlet area (15) includes multiple water outlet units, which are arranged adjacently and assembled in one or more directions of the vertical direction, the horizontal direction, and the longitudinal direction to form the water outlet area (15), and the water inlet unit or the water outlet unit is filled with permeable filler.

6. The subsurface flow constructed wetland system according to claim 1, characterized in that, The first purification area (11) includes a plurality of first purification units. In the horizontal and / or vertical directions, the plurality of first purification units are arranged adjacently and assembled to form the first purification area (11). The first purification unit contains plants and / or fillers.

7. The subsurface flow constructed wetland system according to claim 1, characterized in that, The third purification unit contains nitrogen removal packing and / or the fourth purification unit contains phosphorus removal packing.

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