Modularized composite wetland system capable of adjusting hydrodynamic conditions and use method

Abstract

The invention relates to the technical field of wetland purification, and discloses a modularized composite wetland system capable of adjusting hydrodynamic conditions and a use method. The composite wetland system comprises a peripheral frame body assembly which is divided into a water inlet area, an underflow wetland area and a water outlet area which are communicated in sequence; the undercurrent wet area comprises a plurality of filler boxes, flow guide pieces and connecting pieces, the filler boxes are arranged in an array mode, the connecting pieces are arranged at the corners of the filler boxes, and the flow guide pieces are arranged between any two adjacent connecting pieces; the composite wetland system has a flow pushing and water distributing working state, a partitioned flow pushing and water distributing working state, a tide type water distributing working state, a labyrinth type water distributing working state, a local maintenance working state and a composite working state. The modularized prefabricated parts are adopted, the construction period is short when the prefabricated parts are arranged on site, and economic benefits are improved. When the purification effect becomes poor or is blocked in the long-term operation of the composite wetland system, the hydrodynamic condition can be adjusted, the purification capacity of the composite wetland system is improved, and the operation cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wetland purification, in particular to a modular composite wetland system capable of adjusting water dynamic conditions and a use method thereof. BACKGROUND

[0002] It is common to use an ecological method to further improve the treated effluent and slightly polluted river water at key nodes such as downstream of a drainage outlet of a sewage treatment plant, a river inlet into a lake, and a tributary inlet into a main stream.

[0003] The traditional construction method of a subsurface flow wetland includes earthwork excavation, earthwork backfilling, foundation treatment, concrete construction, impermeable paving, substrate loading, water supply and drainage system laying, and plant planting, and often has a large amount of engineering and a long construction period. In particular, the construction of a subsurface flow wetland for purifying tail water of a decentralized and small rural domestic sewage treatment facility in an underdeveloped rural area is difficult to form scale benefits, and will bring labor and template material inputs.

[0004] In addition, in the operation process of the subsurface flow wetland, the substrate filler can adsorb a large amount of suspended solids, and a large amount of biofilm can be produced by the proliferation of microorganisms in the water during growth. If the aged and fallen biofilm cannot be discharged in time, it will also cause the subsurface flow wetland to be blocked and the water purification effect to be reduced. The substrate filler inside the subsurface flow wetland tank is usually inorganic material such as gravel, gravel, volcanic rock, and zeolite, which is heavy, and a large amount of machinery and manpower is required during the replacement process. It is not convenient to clean and replace the substrate filler, which indirectly increases the operation cost of the subsurface flow wetland. SUMMARY

[0005] Therefore, the present application provides a modular composite wetland system capable of adjusting water dynamic conditions and a use method thereof to solve the problems of long construction period, low economic benefit, inconvenient replacement of substrate filler, and high operation cost of the traditional subsurface flow wetland.

[0006] In a first aspect, the present application provides a modular composite wetland system capable of adjusting water dynamic conditions, comprising: a peripheral frame assembly, the peripheral frame assembly is divided into a water inlet area, a subsurface flow wetland area and a water outlet area in sequence, and the direction from the water inlet area to the water outlet area is a first direction, and the second direction perpendicular to the first direction is a second direction;

[0007] The subsurface flow wetland area comprises: a plurality of filler boxes, a flow guide and a connecting piece, a plurality of filler boxes are arranged in an array, the connecting piece is arranged at the corner of the filler box, and the flow guide is arranged between any two adjacent connecting pieces;

[0008] The composite wetland system has a push-flow water distribution working state, a partitioned push-flow water distribution working state, a tidal water distribution working state, a labyrinth water distribution working state, a local maintenance working state and a composite working state.

[0009] Advantages

[0010] The filler box, the flow guide and the connecting piece are all prefabricated modules, so that the composite wetland system is more convenient to arrange on site, the construction period is greatly shortened, and the economic benefits are improved. Moreover, when the purification effect is poor or the system is blocked after long-term operation, the purification effect of the filler can be fully played by adjusting the hydrodynamic conditions and changing the water flow state, the purification capacity of the composite wetland system can be improved, and the replacement frequency of the filler can be reduced. When a local fault occurs, maintenance work can be performed, the construction operation difficulty is low, and the operation cost of the composite wetland system is low.

[0011] In an optional embodiment, the flow guide is a flow resistance plate or a flow plate with a water flow hole.

[0012] Advantages

[0013] The flow resistance plate can block the water flow, and the flow plate can adjust the water flow and the water level. The two are flexibly arranged and combined to realize the water blocking, partitioning and flow guiding functions, and to realize the adjustment of different hydrodynamic conditions of the composite wetland system.

[0014] In an optional embodiment, in the partitioned push-flow water distribution working state, the subsurface flow wetland region is divided into a plurality of sub-flow regions along the second direction, a plurality of flow resistance plates are arranged continuously along the first direction at the junction of adjacent sub-flow regions, and the number of flow resistance plates arranged at the junction is equal to the number of filler boxes in each row.

[0015] Advantages

[0016] The subsurface flow wetland region is divided into a plurality of sub-flow regions, and the water level, water flow direction and aquatic plant configuration of each sub-flow region are accurately controlled to purify specific pollutants.

[0017] In an optional embodiment, in the tidal water distribution working state, the subsurface flow wetland region is divided into a plurality of sub-flow regions along the first direction, a plurality of flow resistance plates are arranged continuously along the second direction at the junction of adjacent sub-flow regions, the number of flow resistance plates arranged at the junction is less than the number of filler boxes in each column to form a flow port, and one of the two adjacent flow ports is close to the first side edge of the peripheral frame assembly, and the other is close to the second side edge of the peripheral frame assembly.

[0018] Advantages

[0019] The push-flow water distribution working state can be adjusted to a tidal water distribution working state after a period of operation, so as to fully utilize the effective volume of the composite wetland system, balance the dissolved oxygen state of the wetland, and fully exert the water quality purification effect.

[0020] In an alternative embodiment, in the labyrinth water distribution working state, the subsurface flow wetland is divided into a plurality of sub-flow regions along the first direction, and a plurality of flow resistance plates are continuously or intermittently arranged at the junctions between adjacent sub-flow regions, and the number of flow resistance plates arranged at the junctions is less than the number of filler boxes in each column.

[0021] Advantages

[0022] The complex and tortuous flow channel design can prolong the residence time of sewage in the wetland, enhance the contact time of pollutants with fillers, plants and microorganisms, and improve the purification effect.

[0023] In an alternative embodiment, the filler box is provided with subsurface flow wetland fillers or ecological fillers.

[0024] In an alternative embodiment, in the composite working state, the subsurface flow wetland is divided into a plurality of sub-flow regions along the first direction, and the filler boxes in one of the adjacent two sub-flow regions are provided with subsurface flow wetland fillers, and the filler boxes in the other sub-flow region are provided with ecological fillers.

[0025] Advantages

[0026] By segmentally and alternately arranging the subsurface flow wetland fillers and the ecological fillers, the segmental reoxygenation level in the composite wetland system is improved, which helps to alleviate the anaerobic problem of the subsurface flow wetland and the resulting clogging problem, and also improves the water quality purification effect.

[0027] In an alternative embodiment, in the local maintenance working state, the flow resistance plates are arranged around the filler boxes with running faults.

[0028] Advantages

[0029] By arranging the flow resistance plates, the filler boxes with running faults are quickly and short-circuited, and then repaired by self-degradation function of the filler boxes or by replacing the filler boxes for external backwashing or replacing fillers, so as to facilitate the maintenance work.

[0030] In a second aspect, the application further provides a use method of a modular composite wetland system capable of adjusting water dynamic conditions, applied to the composite wetland system, comprising:

[0031] When the water quality purification effect is reduced or the system is blocked during the operation of the composite wetland system, the push-flow water distribution working state is changed into a zoned push-flow water distribution working state, a tidal water distribution working state, a labyrinth water distribution working state or a composite working state.

[0032] Advantages

[0033] Because the modular composite wetland system with adjustable water dynamic conditions is applied to the composite wetland system, the same effect as the composite wetland system is achieved, and thus will not be described here.

[0034] In an optional embodiment, when a local filler tank in the composite wetland system fails, a local maintenance working state is changed. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1 It is a top view of the modular composite wetland system with adjustable water dynamic conditions of the present application;

[0037] Figure 2 It is a side view of the modular composite wetland system with adjustable water dynamic conditions of the present application;

[0038] Figure 3 It is a schematic view of the filler tank in the modular composite wetland system with adjustable water dynamic conditions of the present application;

[0039] Figure 4 It is a schematic view of the flow resistance plate in the modular composite wetland system with adjustable water dynamic conditions of the present application;

[0040] Figure 5 It is a schematic view of the flow resistance plate in the modular composite wetland system with adjustable water dynamic conditions of the present application;

[0041] Figure 6 It is a schematic view of the modular composite wetland system with adjustable water dynamic conditions in a push-flow water distribution working state of the present application;

[0042] Figure 7 It is a schematic view of the modular composite wetland system with adjustable water dynamic conditions in a zoned push-flow water distribution working state of the present application;

[0043] Figure 8Schematic diagram of the modular composite wetland system with adjustable hydrodynamic conditions in a tidal water distribution working state according to the present application;

[0044] Figure 9 Schematic diagram of the modular composite wetland system with adjustable hydrodynamic conditions in a labyrinth water distribution working state according to the present application;

[0045] Figure 10 Schematic diagram of the modular composite wetland system with adjustable hydrodynamic conditions in a local maintenance working state according to the present application;

[0046] Figure 11 Schematic diagram of the modular composite wetland system with adjustable hydrodynamic conditions in a combined working state according to the present application.

[0047] Explanation of reference signs:

[0048] 1, peripheral frame assembly, 11, peripheral partition, 12, peripheral fixing member;

[0049] 2, water inlet area;

[0050] 3, subsurface wetland area, 31, filler box, 311, subsurface wetland filler, 312, ecological filler, 32, flow guide member, 321, flow resistance plate, 322, overflow plate, 33, connecting member, 34, planting layer, 35, planting floating plate, 36, aquatic plant;

[0051] 4, water outlet area. DETAILED DESCRIPTION

[0052] The technical solutions of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] The following is combined Figures 1 to 11 Embodiments of the present invention are described.

[0057] According to an embodiment of the present invention, a modular composite wetland system with adjustable hydrodynamic conditions is provided, comprising: an outer frame assembly 1, wherein the outer frame assembly 1 is divided into an inlet zone 2, a subsurface flow wetland zone 3, and an outlet zone 4 connected in sequence, wherein the direction from the inlet zone 2 to the outlet zone 4 is a first direction, and the direction perpendicular to the first direction is a second direction. The subsurface flow wetland zone 3 includes: multiple packing boxes 31, flow guides 32, and connectors 33, wherein the multiple packing boxes 31 are arranged in an array, and connectors 33 are provided at the corners of the packing boxes 31, and flow guides 32 are disposed between any two adjacent connectors 33. The composite wetland system has a push-flow water distribution working state, a zoned push-flow water distribution working state, a tidal water distribution working state, a labyrinth water distribution working state, a partial maintenance working state, and a combined working state.

[0058] The outer frame assembly 1 can be adaptively adjusted in size and aspect ratio according to site selection conditions. Specifically, from a top view, the outer frame assembly 1 is rectangular in shape and can be formed by multiple outer partitions 11, each of which is defined and fixed by outer fixing members 12 on both sides. Figure 1 As shown, the upper side of the outer frame assembly 1 is the first side, the lower side is the second side, the left side is the water inlet side, and the right side is the water outlet side. The first and second sides do not supply water, while the water inlet and water outlet sides do. The area enclosed by the outer frame assembly 1 is divided into an inlet area 2, a subsurface flow wet area 3, and an outlet area 4 along the first direction (i.e., from the water inlet side to the water outlet side).

[0059] The subsurface wetland area 3 is a key part of the composite wetland system, and includes a plurality of filler boxes 31, flow guides 32, and connecting pieces 33. The plurality of filler boxes 31 are arranged in a multi-row and multi-column arrangement, and the filler boxes 31 are made of glass fiber reinforced plastic grating, galvanized steel support plus grating, or the like, and a geotextile impermeable layer can be provided at the bottom of the filler boxes 31. The filler boxes 31 can be pre-fabricated in several standard sizes to facilitate on-site construction and installation. Each filler box 31 is provided with filler for purifying sewage. The connecting pieces 33 are provided at each corner of the filler boxes 31, and the filler boxes 31 can be connected to the connecting pieces 33 by bolts, and a water-stopping rubber can be provided at the connecting position. The connecting pieces 33 have the same structure as the peripheral fixing pieces 12, and adjacent filler boxes 31 can share the connecting pieces 33. The flow guide plates are fixed by adjacent two connecting pieces 33, and the number and arrangement position of the flow guide plates can change the hydrodynamic conditions of the composite wetland system. When the overall or local water purification effect of the composite wetland system is reduced or blocked during operation, it can be changed from the initial working state (push-flow water distribution working state) to a partitioned push-flow water distribution working state, a tidal water distribution working state, a labyrinth water distribution working state, a local maintenance working state, or a composite working state.

[0060] Since the composite wetland system uses all modular parts that can be pre-fabricated, modular installation can be achieved during the construction phase, the construction speed is faster, and the construction period is shorter. Moreover, the overall size is adjustable, the application range is wider, and the economic benefits are better. When the purification effect is poor or blocked during long-term operation of the composite wetland system, the water flow state can be changed by adjusting the hydrodynamic conditions to fully exert the purification effect of the filler and improve the purification capacity of the composite wetland system. Moreover, local maintenance work can be performed when a fault occurs. Therefore, the composite wetland system can reduce the number of filler replacements, reduce the difficulty of replacement, and has a lower operating cost.

[0061] In one embodiment, the filler boxes 31 are provided with subsurface wetland filler or ecological filler.

[0062] As shown in Figure 2 , the subsurface wetland filler includes zeolite, gravel, steel slag, or the like filled into the filler boxes 31, and a planting layer can be provided on the upper layer of the subsurface wetland filler. The planting layer is made of melon seed pieces, and aquatic plants for purifying water quality can be planted.

[0063] As shown in Figure 2 , the ecological filler includes biological rope filler filled into the filler boxes 31, and the water in the ecological filler is rapidly reoxygenated. Moreover, a planting floating plate can be installed on the upper layer of the ecological filler, and aquatic plants for purifying water quality can be planted.

[0064] In one embodiment, the flow guides 32 are flow resistance plates 321 or flow plates 322 provided with water flow holes.

[0065] As shown in Figure 4 , Figure 5 , the flow guide 32 can be a complete impermeable plate body, i.e. the flow blocking plate 321. It can also be a flow-through plate 322 with water flow holes on the complete plate body. The water flow hole positions on the flow-through plate 322 can be set at any upper, middle, lower or left or right position. The flow blocking plate 321 can change the water flow direction, while the flow-through plate 322 can adjust the water flow, and the combination of the two can achieve the effects of water blocking, zoning and flow guiding, and change the different water dynamic conditions of the composite wetland system.

[0066] In one embodiment, as shown in Figure 6 , the push-flow water distribution working state can be set as the initial state. In the push-flow water distribution working state, the water flow flows uniformly and stably in the first direction, the flow state is stable, and the risk of short flow is low, so that the sewage and the fillers and the roots of aquatic plants can be fully contacted for purification.

[0067] In one embodiment, in the zoning push-flow water distribution working state, the subsurface flow wetland area 3 is divided into multiple sub-flow areas along the second direction, and multiple flow blocking plates 321 are arranged continuously along the first direction at the junction of adjacent sub-flow areas, and the number of flow blocking plates 321 arranged at the junction is equal to the number of filler box bodies 31 in each row.

[0068] As shown in Figure 7 , in this embodiment, the filler box bodies 31 are arranged in six rows and ten columns, and each two rows form a sub-flow area, and three sub-flow areas are divided along the second direction. Ten flow blocking plates 321 are arranged in sequence along the first direction at the junction of the adjacent two sub-flow areas, and each flow blocking plate 321 is fixed by the connecting piece 33. After the flow blocking plates 321 are arranged in this way, the water flow direction in each sub-flow area follows the second direction, and the water flows in adjacent two sub-flow areas do not communicate with each other.

[0069] By accurately controlling the water level, water flow direction and aquatic plant configuration of each sub-flow area, the specific pollutants can be treated.

[0070] In one embodiment, in the tidal water distribution working state, the subsurface flow wetland area 3 is divided into multiple sub-flow areas along the first direction, and multiple flow blocking plates 321 are arranged continuously along the second direction at the junction of adjacent sub-flow areas, and the number of flow blocking plates 321 arranged at the junction is less than the number of filler box bodies 31 in each column to form flow-through openings, and one of the adjacent two flow-through openings is close to the first side edge of the peripheral frame assembly 1, and the other is close to the second side edge of the peripheral frame assembly 1.

[0071] As shown in Figure 8As shown, in this embodiment, the packing box 31 is also arranged in six rows and ten columns, with each two columns forming a diversion zone, dividing the area into five diversion zones along the first direction. Five flow-blocking plates 321 are sequentially arranged from the first side at the junction of the first and second diversion zones and the junction of the third and fourth diversion zones. An outlet is left near the second side of the packing box 31 for sewage flow. Similarly, five flow-blocking plates 321 are sequentially arranged from the second side at the junction of the second and third diversion zones and the junction of the fourth and fifth diversion zones. An outlet is left near the first side of the packing box 31 for sewage flow. Flow-through plates 322 can be installed at other locations to regulate water flow and water level, forming a single water flow channel in the subsurface flow wetland area 3.

[0072] After operating in the push-flow water distribution mode for a period of time, it can be adjusted to the tidal water distribution mode, which can make full use of the effective volume within the composite wetland system, balance the dissolved oxygen state of the wetland, and give full play to the water purification effect.

[0073] In one embodiment, under the maze-type water distribution working state, the subsurface flow wet area 3 is divided into multiple diversion zones along the first direction. Multiple flow-blocking plates 321 are continuously or intermittently arranged at the boundary of adjacent diversion zones, and the number of flow-blocking plates 321 arranged at the boundary is less than the number of packing boxes 31 in each row.

[0074] like Figure 9 As shown, in this embodiment, the packing box 31 is also arranged in six rows and ten columns, with each two columns forming a diversion zone, dividing a total of five diversion zones along the first direction. However, the arrangement of the baffles 321 is irregular. At the junction of the first and second diversion zones, four baffles 321 are arranged sequentially from the first side. At the junction of the second and third diversion zones, four baffles 321 are arranged sequentially from the second side. At the junction of the third and fourth diversion zones, baffles 321 are arranged at the second, third, and fifth packing boxes 31 from the first side. At the junction of the fourth and fifth diversion zones, baffles 321 are arranged at the first, second, fifth, and sixth packing boxes 31 from the first side. This forms a maze-like water flow channel in the subsurface wet area 3.

[0075] The design of the meandering flow channel extends the residence time of wastewater in the wetland, enhances the contact between pollutants and the packing material, plants and microorganisms, and improves the purification effect.

[0076] In one embodiment, under the composite working state, the subsurface flow wetland 3 is divided into multiple diversion zones along the first direction. One of the packing boxes 31 in two adjacent diversion zones is provided with subsurface flow wetland packing, and the other packing box 31 is provided with ecological packing.

[0077] like Figure 10As shown, in this embodiment, the packing boxes 31 are also arranged in six rows and ten columns. The middle two columns of packing boxes 31 are filled with ecological packing material, while the remaining eight columns of packing boxes 31 are filled with subsurface flow wetland packing material. By arranging the subsurface flow wetland packing material and ecological packing material in alternating segments, the segmented reoxygenation level within the wetland system is improved, which helps to alleviate the anaerobic problems of subsurface flow wetlands and the resulting blockage problems, while also improving the water purification effect.

[0078] When the water purification effect decreases or blockage occurs after the composite wetland system has been running in its initial working state (push flow water distribution working state) for a period of time, it can be adjusted to any of the four working states mentioned above, namely, zoned push flow water distribution working state, tidal water distribution working state, labyrinth water distribution working state, and composite working state. By changing the hydrodynamic conditions, the purification effect of the filler can be fully utilized to improve the purification effect of the composite wetland system.

[0079] In one embodiment, during partial maintenance, a baffle plate 321 is installed around the malfunctioning stuffing box 31.

[0080] like Figure 11 As shown, when the composite wetland system has been running in its initial working state for a period of time, if one or more packing boxes 31 experience severe blockage or abnormal aquatic plant growth, a flow barrier 321 can be installed around them to restrict water flow. This allows the packing box 31 to enter a rotational rest period, allowing the biofilm to degrade and recover. Alternatively, the packing box 31 can be replaced and backwashed externally. If a packing box 31 containing subsurface flow wetland packing fails, it can be replaced with a packing box 31 containing ecological packing. The ecological packing can quickly reoxygenate the water and further purify the sludge produced by the subsurface flow wetland packing, reducing the amount of sludge. This maintenance method is convenient to implement, simple to operate, and has low operating costs.

[0081] In this embodiment, the packing box 31 is arranged in six rows and ten columns for example only. It does not impose specific restrictions on the number and arrangement of the packing box 31. In actual application, it can be adjusted and changed according to the size of the construction site.

[0082] According to an embodiment of the present invention, another aspect provides a method for using a modular composite wetland system with adjustable hydrodynamic conditions, applied to a composite wetland system. The composite wetland system has the same structure as the composite wetland system in the above embodiment, and will not be described again.

[0083] The operation methods of the composite wetland system include: when the water purification effect is reduced or blockage is found during the operation of the composite wetland system, the system shall switch from the push flow water distribution mode to the zone push flow water distribution mode, the tidal water distribution mode, the labyrinth water distribution mode, or the combined mode.

[0084] After the composite wetland system runs for a period of time in the initial working state (push-flow water distribution working state), the filler will adsorb a large amount of suspended solids, and the microorganisms in the water will proliferate during the growth process to produce a large amount of biofilm. If the aged biofilm cannot be discharged in time, it will cause blockage and reduce the water purification effect. At this time, the composite wetland system needs to change the water dynamic conditions and change the water flow state, that is, change from the initial working state to any one of the partitioned push-flow water distribution working state, the tidal water distribution working state, the labyrinth water distribution working state and the composite working state, so as to fully utilize the purification space of the subsurface flow wetland zone 3, balance the internal different blockage states, balance the flow state and the dissolved oxygen state in the wetland, and improve the purification effect of the composite wetland system.

[0085] In one embodiment, when a local filler tank 31 in the composite wetland system fails, it is changed to a local repair working state.

[0086] When one or more filler tanks 31 in the composite wetland system appear serious blockage or abnormal growth of aquatic plants during operation, the composite wetland system can be changed to a local repair working state, and repaired by self-degradation function of the filler tank 31 or replacing the filler tank 31 to perform external backwashing or replace the filler.

[0087] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A modular composite wetland system for adjustable hydrodynamic conditions, characterized in that, The application relates to a composite wetland system. The composite wetland system comprises a peripheral frame assembly (1) which is divided into a water inlet area (2), a subsurface flow wetland area (3) and a water outlet area (4) in sequence, and the direction from the water inlet area (2) to the water outlet area (4) is a first direction, and a second direction is perpendicular to the first direction. The subsurface flow wetland area (3) comprises a plurality of filler boxes (31), a flow guide (32) and a connecting piece (33), the plurality of filler boxes (31) are arranged in an array, the connecting piece (33) is arranged at a corner of the filler box (31), and the flow guide (32) is arranged between any two adjacent connecting pieces (33). The composite wetland system has a push-flow water distribution working state, a partitioned push-flow water distribution working state, a tidal water distribution working state, a labyrinth water distribution working state, a local maintenance working state and a composite working state.

2. The modular composite wetland system with adjustable hydrodynamic conditions according to claim 1, characterized in that, The flow guide (32) is a flow resistance plate (321) or a flow plate (322) provided with a water passing hole.

3. The modular composite wetland system with adjustable hydrodynamic conditions according to claim 2, characterized in that, In the partitioned push-flow water distribution working state, the subsurface flow wetland area (3) is divided into a plurality of flow distribution areas along the second direction, a plurality of flow resistance plates (321) are arranged in sequence along the first direction at the junction of adjacent flow distribution areas, and the number of the flow resistance plates (321) arranged at the junction is equal to the number of the filler boxes (31) in each row.

4. The modular composite wetland system of adjustable hydrodynamic conditions according to claim 2, characterized in that, In the tidal water distribution working state, the subsurface flow wetland area (3) is divided into a plurality of flow distribution areas along the first direction, a plurality of flow resistance plates (321) are arranged in sequence along the second direction at the junction of adjacent flow distribution areas, the number of the flow resistance plates (321) arranged at the junction is less than the number of the filler boxes (31) in each column to form a flow passing port, and one of the two adjacent flow passing ports is close to a first side edge of the peripheral frame assembly (1), and the other is close to a second side edge of the peripheral frame assembly (1).

5. The modular composite wetland system of adjustable hydrodynamic conditions according to claim 2, characterized in that, In the labyrinth water distribution working state, the subsurface flow wetland area (3) is divided into a plurality of flow distribution areas along the first direction, a plurality of flow resistance plates (321) are arranged in sequence or at intervals at the junction of adjacent flow distribution areas, and the number of the flow resistance plates (321) arranged at the junction is less than the number of the filler boxes (31) in each column.

6. The modular composite wetland system of adjustable hydrodynamic conditions according to claim 2, characterized in that, The filler box (31) is provided with subsurface flow wetland filler or ecological filler.

7. The modular composite wetland system of adjustable hydrodynamic conditions according to claim 6, characterized in that, In the composite working state, the subsurface flow wetland area (3) is divided into a plurality of flow distribution areas along the first direction, the filler boxes (31) in one of the adjacent two flow distribution areas are provided with the subsurface flow wetland filler, and the filler boxes (31) in the other flow distribution area are provided with the ecological filler.

8. The modular composite wetland system of adjustable hydrodynamic conditions according to claim 2, characterized in that, In the local maintenance working state, the flow resistance plates (321) are arranged around the filler boxes (31) in operation failure.

9. A method of using a modular composite wetland system for adjusting hydrodynamic conditions, applied to the composite wetland system according to any one of claims 1-8, characterized in that, When the water quality purification effect is reduced or blocked during the operation of the composite wetland system, the push-flow water distribution working state can be changed into the partitioned push-flow water distribution working state, the tidal water distribution working state, the labyrinth water distribution working state or the composite working state. ​ 10. The method of using the modular composite wetland system with adjustable hydrodynamic conditions according to claim 9, characterized in that, When the local filler box (31) in the composite wetland system fails, it is converted into a local maintenance working state.

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