Pipeline assembly type subsurface flow constructed wetland

Abstract

The invention relates to the technical field of constructed wetlands, in particular to a pipeline assembly type subsurface flow constructed wetland which is formed by serially assembling a sedimentation unit and a plurality of wetland treatment units which are arranged in sequence through a concrete prefabricated connecting seat, and in the sedimentation unit, a flow distribution pipe is arranged in a sedimentation tank in a manner of being vertical to the length direction of the constructed wetland; a plurality of flow distribution holes are arrayed in the flow distribution pipe in the length direction, one end of the flow distribution pipe is sealed by a blind plate, the other end of the flow distribution pipe is communicated with the main inlet pipe, sewage enters from the end side of the flow distribution pipe, and a sedimentation structure is arranged in the sedimentation tank. The settling unit is arranged on the upstream side of the constructed wetland, fine impurities in sewage entering the constructed wetland can be settled in advance, and settled and collected sewage is pumped and discharged regularly through the sewage pump, so that the burden of subsequent treatment steps of the constructed wetland is reduced, the sewage treatment efficiency of the constructed wetland is improved, and the sewage treatment cost is reduced. A partition plate and a baffle plate are arranged in the sedimentation tank for sedimentation partition, so that impurities can be subjected to partition sedimentation.

Description

Technical Field

[0001] The invention relates to the technical field of artificial wetlands, in particular to a pipeline-assembled subsurface flow artificial wetland. Background Art

[0002] As a sewage treatment technology that imitates the principles of natural wetlands, artificial wetlands are widely used in the field of sewage treatment due to their low cost and eco-friendliness. Subsurface flow artificial wetlands are one of the most commonly used types. They utilize sewage to flow inside the wetland bed and rely on the physical, chemical and biological synergy of hydrophilic plants, fillers and microorganisms to effectively remove pollutants in sewage, thereby achieving low-cost, near-natural ecological sewage treatment effects.

[0003] In order to avoid blockage of the wetland piping system caused by large impurities, it is usually necessary to pre-filter the large impurities in the sewage before it enters the artificial wetland. The pre-filtration only removes large impurities, and the filtering accuracy is insufficient. Therefore, there will still be some fine impurities entering the wetland piping system with the sewage. The fine impurities include silt particles, metal oxides, scale components such as calcium carbonate and magnesium carbonate, and organic colloids. A large amount of fine impurities excessively flow into the artificial wetland, which undoubtedly increases the treatment burden of the artificial wetland and reduces the treatment efficiency.

[0004] In addition, the main structure of traditional subsurface artificial wetlands usually adopts reinforced concrete structure, which is usually poured on site. This construction method not only has a large amount of on-site work and a long construction period, but also makes it difficult to achieve standardized construction, resulting in high construction costs. In addition, it is not conducive to rapid construction and subsequent maintenance, expansion and other renovations. Summary of the invention

[0005] The purpose of the present invention is to provide a pipeline-assembled subsurface flow artificial wetland to solve the technical problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions.

[0007] A pipeline-assembled subsurface artificial wetland, the artificial wetland is formed by assembling in series a sedimentation unit and a plurality of wetland treatment units arranged in sequence by using a prefabricated concrete connection seat. In the sedimentation unit, a distribution pipe is arranged in a sedimentation tank in a vertical manner in the length direction of the artificial wetland. A plurality of distribution holes are arranged in an array along the length direction of the distribution pipe. One end of the distribution pipe is sealed by a blind plate, and the other end is connected to a main inlet pipe, so that sewage enters from the end side of the distribution pipe. A sedimentation structure is provided in the sedimentation tank. A water distribution cavity formed in the sedimentation tank in cooperation with the distribution holes is divided into a plurality of sedimentation areas by the sedimentation structure along the length direction of the distribution pipe, which are used for classified sedimentation of fine impurities. When assembling by using a prefabricated concrete connection seat, the drainage pipe in the sedimentation unit is adaptively connected to the water inlet pipe in the next wetland treatment unit, and the drainage pipe in the previous wetland treatment unit is adaptively connected to the water inlet pipe in the next wetland treatment unit.

[0008] Preferably, the sedimentation unit also includes a water collecting pipe arranged parallel to the flow distribution pipe, the flow distribution pipe is arranged on the upstream side of the sedimentation tank, the main inlet pipe is introduced into the sedimentation tank from the outside and communicates with the flow distribution pipe, the water collecting pipe is arranged on the downstream side of the sedimentation tank, the water collecting pipe sealed at both ends is evenly distributed with a number of water collecting holes along its length direction, and a drainage pipe is connected in the middle of the water collecting pipe and extends through to the outside of the sedimentation tank.

[0009] Preferably, the sedimentation structure includes a baffle and a plurality of partitions, the baffles are arranged in an array along the length direction of the flow distribution pipe in the sedimentation tank, and the flow distribution holes on the flow distribution pipe are segmented to form a plurality of sedimentation areas in the sedimentation tank, the partitions extend along the length direction of the artificial wetland, the baffles are fixed in the sedimentation tank, and are fixed to one end of the flow distribution pipe away from each partition.

[0010] The top of the partition is lower than the top of the sedimentation tank, the top of the baffle is lower than the top of each partition, the height of each water collection hole is less than the height of the top of the baffle, the bottom of each partition is fixed to the bottom wall of the sedimentation tank, and one end is fixed to the inner wall of the sedimentation tank, the bottom of the baffle is fixed to the bottom wall of the sedimentation tank, and both ends are fixed to the inner wall of the sedimentation tank respectively.

[0011] Preferably, the bottom of each sedimentation area has a slope inclined toward the side of the flow distribution pipe, and a sewage pump is provided on the outer wall of the sedimentation tank away from the water collecting pipe and corresponding to the position of each sedimentation area. One end of the sewage pump is connected to the corresponding sedimentation area through the second pipe, and the other end is connected to the sewage collecting device through the first pipe.

[0012] Preferably, the wetland treatment unit includes a treatment tank, a pair of pipe bodies and a support layer, wherein one pipe body is arranged on the upstream side of the treatment tank, and has an inlet pipe extending thereon to the outside of the treatment tank, and the other pipe body is arranged on the downstream side of the treatment tank, and has a drainage pipe extending thereon to the outside of the treatment tank, and the pipe bodies are arranged parallel to the flow pipes, and holes are arrayed on the pipe bodies.

[0013] The support layer is arranged in the treatment pool and is located below the two pipe bodies. A filler area is formed below the support layer in the treatment pool. The gaps between the fillers contain microorganisms. A planting area is arranged above the support layer in the treatment pool to plant wetland plants.

[0014] Preferably, both sides of the prefabricated concrete connecting seat are provided with card-mounting grooves for matching and snapping into the sedimentation tank or the treatment tank, and a connecting hole is provided in the card-mounting groove. Insertion holes are respectively provided on the inner end walls of the two card-mounting grooves, and the insertion holes are for matching and inserting the water inlet pipe or the drainage pipe. The two insertion holes are respectively connected with the two ends of the connecting hole, and the inner diameter of the connecting hole is smaller than the inner diameter of the insertion hole.

[0015] Match the sedimentation tank into the card slot on one side and lock it with fasteners, match the treatment tank into the card slot on the other side and lock it with fasteners to complete the assembly and connection of the sedimentation unit and the wetland treatment unit. At the same time, the drain pipe in the sedimentation unit is positioned and matched and inserted into the insertion hole on one side, and abutted and sealed with the inner end wall of the insertion hole. The water inlet pipe in the wetland treatment unit is positioned and matched and inserted into the insertion hole on the other side, and abutted and sealed with the inner end wall of the insertion hole, so as to realize the adaptive connection of the water inlet pipe and the drain pipe.

[0016] Match the treatment pool into the card slot on one side and lock it with fasteners, match the other treatment pool into the card slot on the other side and lock it with fasteners to complete the assembly and connection of the wetland treatment unit and the wetland treatment unit. At the same time, the drainage pipe in the wetland treatment unit is positioned and matched and inserted into the insertion hole on one side, and abutted and sealed with the inner end wall of the insertion hole. The water inlet pipe in the other wetland treatment unit is positioned and matched and inserted into the insertion hole on the other side, and abutted and sealed with the inner end wall of the insertion hole, so as to realize the adaptive connection of the water inlet pipe and the drainage pipe.

[0017] Preferably, a prefabricated concrete pressure cover and a prefabricated concrete base A are assembled and fixed on the upstream side wall of the sedimentation tank, the flow pipe limit card is installed between the prefabricated concrete pressure cover and the prefabricated concrete base A, a prefabricated concrete base B is assembled and fixed on the downstream side wall of the sedimentation tank, the collecting pipe is fastened to the collecting pipe by anti-floating anchors, and the prefabricated concrete base B is assembled and fixed on both the upstream and downstream side walls of the treatment tank, and the pipe body is fastened to the corresponding prefabricated concrete base B by anti-floating anchors respectively.

[0018] Preferably, a number of guide plates are arranged at intervals along the length direction of the artificial wetland in the treatment pool, each guide plate vertically penetrates the supporting layer and is cross-fixed to the supporting layer, the guide plates are arranged alternately, one high and one low, the bottom end of the lower guide plate is fixed to the bottom wall of the treatment pool, the top end of the higher guide plate extends to above the planting area, the two sides of the guide plate are respectively fixed to the inner walls of the treatment pool, and the bottom of the precast concrete base B on the inner walls on the upstream and downstream sides of the treatment pool are fixed to the upper surface of the supporting layer.

[0019] Preferably, the top of the sedimentation tank is kept flush with the top of each treatment tank.

[0020] Preferably, the flow distribution pipe is a concrete casting pipe, the water collecting pipe and each pipe body are PE pipes, and the water collecting pipe and each pipe body are fixed with an inner support frame, and the cross section of the inner support frame is a cross-shaped frame.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0022] The artificial wetland provided by the present invention is composed of a sedimentation unit, a plurality of wetland treatment units and a plurality of prefabricated concrete connecting seats. The sedimentation unit, the wetland treatment unit and the prefabricated concrete connecting seats are all prefabricated modules, which can be assembled and matched at the construction site. The standard modular operation replaces the traditional on-site concrete pouring, reduces the construction difficulty and cost, and the sedimentation unit and the wetland treatment unit are modularly adapted to the prefabricated concrete connecting seats, which is convenient for later maintenance, expansion and transformation according to different sewage.

[0023] The present invention can pre-sediment fine impurities in sewage entering the artificial wetland by setting a sedimentation unit on the upstream side of the artificial wetland, and regularly suck out the collected sewage through the sewage pump, so as to reduce the burden of subsequent treatment steps of the artificial wetland and improve the sewage treatment efficiency of the artificial wetland. In addition, the sewage is introduced from one side of the distribution pipe by using the main inlet pipe, and partitions and baffles are set in the sedimentation tank for sedimentation partitioning. In combination with the characteristics of different gravity and inertia of impurities, the impurities can be settled in different zones, which is convenient for subsequent targeted classification and treatment of the impurities.

[0024] In addition, the baffles are fixedly connected to the partitions to form a support body, which is fixed to the inner wall of each position of the sedimentation tank, and cooperates with the sedimentation tank to provide effective support to each other, thereby improving the overall structural strength of the sedimentation unit, making the sedimentation tank less likely to deform and highly stable. The partitions and baffles serve as both blocking parts for the zoning sedimentation of fine impurities and supporting parts for increasing the structural strength of the sedimentation unit, killing two birds with one stone.

[0025] When the present invention uses the prefabricated concrete connection seat to assemble the sedimentation tank and the treatment tank, and the treatment tank and the treatment tank, the two adjacent tank bodies are respectively matched and clamped in the clamping grooves on both sides of the prefabricated concrete connection seat, and the adjacent tank bodies are firmly combined by the prefabricated concrete connection seat to form a whole. When facing external environmental factors such as water flow impact and ground settlement, it is ensured that the tank bodies will not be separated or misplaced, thereby improving the anti-interference ability of the artificial wetland, ensuring its stability and reliability during operation, and prolonging the service life of the entire artificial wetland;

[0026] In addition, by utilizing the structures of the water inlet pipe, the drainage pipe and the insertion holes, the upstream drainage pipe and the downstream water inlet pipe can be adaptively paired, thereby realizing the automatic assembly and connection of the corresponding pipes. Without the need to set up additional connectors to connect the pipes, the series conduction of the entire artificial wetland can be achieved, reducing the difficulty of pipeline layout. The prefabricated concrete connecting seat serves as an assembly joint for each pool body and provides a basis for the connection of adjacent pipes, killing two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the internal structure of the sedimentation tank in the present invention;

[0029] Figure 3 for Figure 2 A schematic diagram of another viewing angle of the structure shown;

[0030] Figure 4 for Figure 2 One of the schematic cross-sectional views of the structure shown;

[0031] Figure 5 for Figure 2 The second schematic diagram of the structural cross section shown;

[0032] Figure 6 It is a schematic diagram of the internal structure of the treatment pool in the present invention;

[0033] Figure 7 for Figure 6 A schematic cross-sectional view of the structure shown;

[0034] Figure 8 This is a schematic diagram of the installation of the pipe structure on the upstream side of the treatment pool;

[0035] Fig. 9 This is a schematic diagram of the installation of the pipe structure on the downstream side of the treatment pool;

[0036] Fig.10 It is a detailed structural schematic diagram of the prefabricated concrete connection seat in the present invention;

[0037] Fig.11 for Fig.10 A schematic cross-sectional view of the structure shown;

[0038] Fig.12 for Figure 1 A schematic cross-sectional view of the structure shown;

[0039] Fig.13 for Fig.12 A schematic diagram of the structure enlargement at point A;

[0040] Fig.14This is a schematic diagram of the sewage treatment operation of the present invention.

[0041] In the figure: 01, precast concrete gland; 02, precast concrete base A; 03, precast concrete base B; 031, anti-floating anchor; 04, water inlet pipe; 05, drainage pipe; 06, main inlet pipe; 07, blind plate; 08, inner support frame; 1, sedimentation unit; 11, sedimentation tank; 12, flow distribution pipe; 121, flow distribution hole; 13, water collection pipe; 131, water collection hole; 2, wetland treatment unit; 21, treatment Pool; 22, pipe body; 221, holes; 23, support layer; 24, filling area; 25, planting area; 26, guide plate; 3, precast concrete connection seat; 301, fastener; 31, card slot; 32, connecting hole; 33, plug-in hole; 4, sedimentation structure; 41, partition; 411, sedimentation area; 412, slope; 42, baffle; 43, sewage pump; 431, first pipeline; 432, second pipeline. DETAILED DESCRIPTION

[0042] See also Figure 1-Figure 14 The present invention provides a pipeline-assembled subsurface flow artificial wetland. The embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention.

[0043] The artificial wetland is formed by assembling a sedimentation unit 1 and a plurality of wetland treatment units 2 arranged in series by using a prefabricated concrete connecting seat 3. The artificial wetland is extended in a straight line as a whole, which is convenient for increasing or decreasing the wetland treatment units 2 according to the degree of sewage pollution. The sedimentation unit 1 is arranged on the upstream side and is used for pre-settling and discharging fine impurities in the sewage entering the artificial wetland, so as to reduce the pressure burden of subsequent treatment of the artificial wetland and improve the sewage treatment efficiency of the entire artificial wetland.

[0044] like Figure 2-Figure 5 As shown, the sedimentation unit 1 includes a sedimentation tank 11, a flow distribution pipe 12 and a water collecting pipe 13. The flow distribution pipe 12 is arranged on the upstream side of the sedimentation tank 11 perpendicular to the length direction of the artificial wetland. The flow distribution pipe 12 is arrayed along its length direction with a plurality of flow distribution holes 121. One end of the flow distribution pipe 12 is sealed by a blind plate 07, and the other end is connected to a main inlet pipe 06 that penetrates from the outside and is introduced into the sedimentation tank 11, so that sewage enters from the end side of the flow distribution pipe 12. The sewage is transported to the flow distribution pipe 12 by the main inlet pipe 06, and flows evenly into the sedimentation tank 11 through the flow distribution holes 121 on the flow distribution pipe 12 to achieve flow distribution. Since the flow distribution holes 121 are arranged in an array along the length direction of the flow distribution pipe 12, the sewage can flow evenly into the sedimentation tank 11 along the length direction of the flow distribution pipe 12. The sewage flows through the covered area, which is the water distribution cavity in the sedimentation tank 11.

[0045] The water collecting pipe 13 is arranged on the downstream side of the sedimentation tank 11 and is kept parallel to the flow distribution pipe 12. Both ends of the water collecting pipe 13 are sealed, and a number of water collecting holes 131 are evenly distributed along its length. The middle of the water collecting pipe 13 is connected to a drainage pipe 05 that extends through and extends to the outside of the sedimentation tank 11. The water in the sedimentation tank 11 can enter the water collecting pipe 13 through the water collecting holes 131 to achieve flow collection, and flow into the downstream wetland treatment unit 2 through the drainage pipe 05 for sewage wetland treatment.

[0046] Among them, a sedimentation structure 4 is provided in the sedimentation tank 11, and the sedimentation structure 4 includes a baffle 42 and a plurality of partitions 41. The baffles 42 are arranged in an array in the sedimentation tank 11 along the length direction of the flow distribution pipe 12, and at the same time, the flow distribution holes 121 on the flow distribution pipe 12 are divided into sections to form a plurality of sedimentation areas 411 in the sedimentation tank 11. It can be understood that the plurality of partitions 41 divide the flow distribution pipe 12 into multiple sections, each section contains multiple flow distribution holes 121, and each section on the flow distribution pipe 12 corresponds to the position of the sedimentation area 411 one by one. The partitions 41 extend along the length direction of the artificial wetland. The baffles 42 are fixed in the sedimentation tank 11 and fixed to one end of each partition 41 away from the flow distribution pipe 12. The top of the partition 41 is lower than the top of the sedimentation tank 11, the top of the baffle 42 is lower than the top of each partition 41, and the height of each water collection hole 131 is less than the height of the top of the baffle 42.

[0047] After preliminary coarse filtration, the volumes of fine impurities mixed in the sewage are roughly the same, but the densities of different impurities are different. The fine impurities include silt particles, metal oxides, scale components such as calcium carbonate and magnesium carbonate, and organic colloids. When the sewage is connected to the impurities mixed in it, it enters the distribution pipe 12 from the main inlet pipe 06 at a certain flow rate, and then flows into the sedimentation tank 11 from each distribution hole 121. The heavier impurities follow the sewage into the distribution pipe 12 at a certain flow rate and have a larger inertia. Under the impetus of the high-speed water flow, they maintain a tendency to move toward the side of the blind plate 07. The state change of the water flowing out of the distribution hole 121 to the sedimentation tank 11 is not enough to overcome the larger inertia of the impurities and make them change direction and flow out directly from the distribution hole 121. When the sewage flows in the distribution pipe 12 to the blind plate 07, the flow rate decreases, and the inertial influence of the impurities is relatively reduced, so it is easy to flow from the distribution hole 121 near the blind plate 07 to the sedimentation tank 11.

[0048] According to the above principle, impurities of different weights can flow into different sedimentation areas 411 from the flow holes 121 in different sections of the flow pipe 12. For example, fine impurities such as organic colloids flow from the flow holes 121 in the section of the flow pipe 12 close to the main inlet pipe 06 into the sedimentation area 411 close to the main inlet pipe 06; fine impurities such as oxides, calcium carbonate, magnesium carbonate and other scale components flow from the flow holes 121 in the middle section of the flow pipe 12 into the sedimentation area 411 in the middle; heavier impurities such as mud and sand particles flow from the flow holes 121 in the section of the flow pipe 12 close to the blind plate 07 into the sedimentation area 411 close to the blind plate 07, thereby achieving the classification of fine impurities.

[0049] The classified fine impurities settle in the corresponding sedimentation area 411 due to gravity, and the water body continues to flow downstream over the baffle 42 and enters the water collecting pipe 13 through each water collecting hole 131, thereby realizing the pre-sedimentation treatment of the fine impurities and reducing the burden of excessive impurities in the water on subsequent treatment.

[0050] Among them, the bottom end of each partition 41 is fixed to the inner bottom wall of the sedimentation tank 11, and one end is fixed to the inner side wall of the sedimentation tank 11. The bottom end of the baffle 42 is fixed to the inner bottom wall of the sedimentation tank 11, and both ends are fixed to the inner side wall of the sedimentation tank 11. The baffle 42 is fixedly connected with each partition 41 to form a support body. The support body is fixed to the inner wall of each position of the sedimentation tank 11, and cooperates with the sedimentation tank 11 to provide effective support to each other, thereby improving the overall structural strength of the sedimentation unit 1, making the sedimentation tank 11 not easy to deform and highly stable. At the same time, the partition 41 and the baffle 42 serve as both a barrier for the partitioning and settling of fine impurities and a support for increasing the structural strength of the sedimentation unit 1, killing two birds with one stone.

[0051] like Figure 4 As shown, a sewage pump 43 is provided on the outer wall of the sedimentation tank 11 away from the water collecting pipe 13 and corresponding to the position of each sedimentation area 411. One end of the sewage pump 43 is connected to the corresponding sedimentation area 411 through the second pipe 432, and the other end is connected to the sewage collecting device through the first pipe 431. By regularly controlling the artificial wetland to stop running, the water and impurities retained in each sedimentation area 411 form slurry. Through the operation of each sewage pump 43, the slurry in each sedimentation area 411 is pumped into the sewage collecting device through the second pipe 432 and the second pipe 432 in turn for subsequent treatment. The slurry discharge route is as shown in FIG. Fig.14 As shown by the dotted arrow in .

[0052] In addition, the bottom of each sedimentation area 411 has a slope 412 inclined toward the side of the distribution pipe 12. When the slurry in each sedimentation area 411 is sucked out, the slope 412 is inclined toward the side of the second pipe 432, which can ensure that the slurry in the sedimentation area 411 is drained as much as possible.

[0053] like Figures 6 to 8 As shown, the wetland treatment unit 2 includes a treatment pool 21, a pair of pipe bodies 22 and a support layer 23, wherein one pipe body 22 is arranged on the upstream side of the treatment pool 21, and has an inlet pipe 04 extending thereon to the outside of the treatment pool 21, and the other pipe body 22 is arranged on the downstream side of the treatment pool 21, and has a drainage pipe 05 extending thereon to the outside of the treatment pool 21, and the pipe bodies 22 are arranged in parallel with the flow distribution pipe 12, and holes 221 are arrayed on the pipe bodies 22.

[0054] The sewage in the sedimentation unit 1 is collected by the collecting pipe 13, and flows into the water inlet pipe 04 in the downstream wetland treatment unit 2 through the drainage pipe 05 on the collecting pipe 13, enters the pipe body 22 on the upstream side of the treatment tank 21 through the water inlet pipe 04, and flows out to the treatment tank 21 through the hole 221. After being treated in the treatment tank 21, it can flow into the pipe body 22 on the downstream side of the treatment tank 21, and flow into the wetland treatment unit 2 on the downstream side through the drainage pipe 05 to continue treatment, thereby realizing multi-stage treatment of sewage.

[0055] Specifically, the support layer 23 is arranged in the treatment pool 21 and is located below the two pipe bodies 22. A filling area 24 is formed in the treatment pool 21 below the support layer 23. The gaps in the filler contain microorganisms. The filler can be gravel, sand, etc. A planting area 25 is arranged above the support layer 23 in the treatment pool 21 to plant wetland plants. The wetland plants can be reeds, cattails, etc. The planting area 25 and the filling area 24 are separated by the support layer 23. The support layer 23 serves as the load-bearing part of the planting area 25 and the wetland plants.

[0056] When sewage enters the treatment pool 21, the filler is used to physically filter the sewage to intercept suspended matter in the sewage. At the same time, the filler provides a surface for microorganisms to attach and grow. The microorganisms are aerobic microorganisms, which decompose organic pollutants in the sewage into harmless substances such as carbon dioxide and water through metabolic activities, and transform and remove nutrients such as nitrogen and phosphorus. The roots of wetland plants can absorb nutrients such as nitrogen and phosphorus in the sewage for their own growth and development, and release oxygen into the environment around the roots, providing suitable living conditions for aerobic microorganisms, effectively simulating the natural environment of the wetland, and realizing biological sewage treatment.

[0057] Several guide plates 26 are arranged at intervals along the length direction of the artificial wetland in the treatment tank 21. Each guide plate 26 vertically penetrates the support layer 23 and is cross-fixed to the support layer 23. The guide plates 26 are arranged alternately in a high and a low manner. The bottom end of the guide plate 26 at a lower position is fixed to the bottom wall of the treatment tank 21, and the top end of the guide plate 26 at a higher position extends to the top of the planting area 25 to ensure that the water flow can grind the root system of the wetland plants. After entering the treatment tank 21, the water flow uses the diversion effect of the guide plate 26 to flow up and down in the treatment tank 21. The sewage flows in the following direction: Fig.14 As shown by the solid arrows in the figure, it is ensured that the water flows alternately through the filling area 24 and the planting area 25 multiple times in the treatment pool 21, extending the treatment process in the treatment pool 21 and improving the effect of the single wetland treatment unit 2 on the water body treatment.

[0058] When assembling using the prefabricated concrete connection seat 3, the drainage pipe 05 in the sedimentation unit 1 is adaptively connected to the water inlet pipe 04 in the next wetland treatment unit 2, and the drainage pipe 05 in the previous wetland treatment unit 2 is adaptively connected to the water inlet pipe 04 in the next wetland treatment unit 2, as follows:

[0059] like Fig.10 and Fig.11 As shown, both sides of the prefabricated concrete connection seat 3 are respectively provided with a card slot 31 for the sedimentation tank 11 or the treatment tank 21 to match and snap into, a connecting hole 32 is provided in the card slot 31, and an insertion hole 33 is respectively provided on the inner end wall of the two card slots 31, and the insertion hole 33 is for the water inlet pipe 04 or the drainage pipe 05 to match and insert, and the two insertion holes 33 are respectively connected with the two ends of the connecting hole 32, and the inner diameter of the connecting hole 32 is smaller than the inner diameter of the insertion hole 33.

[0060] When the sedimentation unit 1 and the wetland treatment unit 2 are assembled by using the prefabricated concrete connecting seat 3, the sedimentation tank 11 is matched and inserted into the card slot 31 on one side and locked by the fastener 301, and the treatment tank 21 is matched and inserted into the card slot 31 on the other side and locked by the fastener 301 to complete the assembly connection of the sedimentation unit 1 and the wetland treatment unit 2. At the same time, the drainage pipe 05 in the sedimentation unit 1 is positioned and matched and inserted into the insertion hole 33 on one side, and is abutted and sealed with the inner end wall of the insertion hole 33. The water inlet pipe 04 in the wetland treatment unit 2 is positioned and matched and inserted into the insertion hole 33 on the other side, and is abutted and sealed with the inner end wall of the insertion hole 33, so as to realize the adaptive connection between the water inlet pipe 04 and the drainage pipe 05.

[0061] When the wetland treatment unit 2 is assembled with the wetland treatment unit 2 using the prefabricated concrete connecting seat 3, the treatment tank 21 is matched and inserted into the card slot 31 on one side and locked with the fastener 301, and the other treatment tank 21 is matched and inserted into the card slot 31 on the other side and locked with the fastener 301 to complete the assembly connection between the wetland treatment unit 2 and the wetland treatment unit 2. At the same time, the drainage pipe 05 in the wetland treatment unit 2 is positioned and matched and inserted into the insertion hole 33 on one side, and is abutted and sealed with the inner end wall of the insertion hole 33. The water inlet pipe 04 in the other wetland treatment unit 2 is positioned and matched and inserted into the insertion hole 33 on the other side, and is abutted and sealed with the inner end wall of the insertion hole 33 to achieve adaptive connection between the water inlet pipe 04 and the drainage pipe 05.

[0062] The fastener 301 may be a bolt, a buckle or a pin.

[0063] When the sedimentation tank 11 and the treatment tank 21 and the treatment tank 21 and the treatment tank 21 are assembled and paired using the prefabricated concrete connection seat 3, the two adjacent tank bodies are respectively matched and mounted in the mounting grooves 31 on both sides of the prefabricated concrete connection seat 3. The prefabricated concrete connection seat 3 is used to firmly combine the adjacent tank bodies to form a whole. When facing external environmental factors such as water flow impact and ground subsidence, it is ensured that the tank bodies will not separate or misalign, improve the anti-interference ability of the artificial wetland, ensure its stability and reliability during operation, and improve the service life of the artificial wetland as a whole. By using the structure of the water inlet pipe 04, the drainage pipe 05, and the insertion hole 33 respectively, the upstream drainage pipe 05 and the downstream water inlet pipe 04 can be adaptively paired, thereby realizing the automatic assembly and connection of the corresponding pipelines. There is no need to set up additional connectors to connect the pipelines, and the series conduction of the entire artificial wetland can be realized, reducing the difficulty of pipeline layout. The prefabricated concrete connection seat 3 serves as an assembly joint for each tank body and provides a basis for the connection of adjacent pipelines, killing two birds with one stone.

[0064] like Figure 4 , Figure 8 and Fig. 9 As shown, a prefabricated concrete gland 01 and a prefabricated concrete base A02 are assembled and fixed on the upstream side wall of the sedimentation tank 11, and the flow distribution pipe 12 is limitedly mounted between the prefabricated concrete gland 01 and the prefabricated concrete base A02, and the prefabricated concrete gland 01 and the prefabricated concrete base A02 have grooves that match the flow distribution pipe 12, and the flow distribution pipe 12 is embedded and assembled between the prefabricated concrete gland 01 and the prefabricated concrete base A02 to improve the ability of the flow distribution pipe 12 to resist water flow impact, and a prefabricated concrete base is assembled and fixed on the downstream side wall of the sedimentation tank 11 B03, the water collecting pipe 13 is fastened to the water collecting pipe 13 by anti-floating anchors 031, and precast concrete bases B03 are assembled and fixed on the upstream and downstream side walls of the treatment pool 21. The pipe body 22 is fastened to the corresponding precast concrete bases B03 by anti-floating anchors 031 respectively. The precast concrete bases B03 have grooves that match the water collecting pipe 13 and the pipe body 22. The anti-floating anchors 031 are used to fasten the water collecting pipe 13 or the pipe body 22 to the precast concrete base B03, thereby improving the ability of the water collecting pipe 13 and the pipe body 22 to resist water flow impact.

[0065] like Figure 7 As shown, both sides of the guide plate 26 are fixed to the inner walls of the treatment tank 21 respectively, and the bottoms of the precast concrete base B03 on the inner walls of the upstream and downstream sides of the treatment tank 21 are fixed to the upper surface of the support layer 23. The guide plates 26 are arranged vertically and cross-fixed with the support layer 23 to form a support body, and both sides of the support body are fixed to the precast concrete base B03 respectively, and are also fixed to the inner walls of the treatment tank 21, providing effective support in the treatment tank 21, so that the treatment tank 21 is not easily deformed and has high stability.

[0066] In addition, the top of the sedimentation tank 11 and the top of each treatment tank 21 are kept flush. During the flood season, the artificial wetland stops operating. Due to the high underground water content, external water will penetrate into the artificial wetland, causing the water level in the artificial wetland to rise. In order to prevent the sewage retained in the artificial wetland from directly overflowing into the surrounding soil due to the rising water level and causing pollution, the first pipe 431 is connected to the sewage collection facility, and the sewage pump 43 can be used to suck out the stagnant water in the artificial wetland system, ensuring that the water level inside the artificial wetland is maintained at a position lower than the top of the sedimentation tank 11 and the treatment tank 21, so as to avoid the overflow of sewage inside the artificial wetland and cause pollution to the surrounding soil environment.

[0067] In addition, the distribution pipe 12 adopts a concrete casting pipe. Since the impurities in the sewage that have not settled directly enter the distribution pipe 12, it will cause excessive impact on the inner wall of the distribution pipe 12. The use of concrete casting pipes as the distribution pipes 12 has strong impact resistance. The water collecting pipe 13 and each pipe body 22 adopt PE pipes. PE pipes are cheap and light, which reduces construction costs and difficulty. At the same time, the water collecting pipe 13 and each pipe body 22 are fixed with an internal support frame 08. The cross-section of the internal support frame 08 is a cross-shaped frame. The internal support frame 08 is used to provide support for the water collecting pipe 13 and the pipe body 22, so that the water collecting pipe 13 and the pipe body 22 are not easy to deform and have strong pressure resistance.

[0068] The specific construction steps of the pipeline assembled subsurface flow artificial wetland provided by the present invention are as follows:

[0069] Excavate the foundation pit according to the design, construct the cushion layer and arrange the prefabricated foundation after excavating to the designed elevation;

[0070] With the help of lifting machinery, the settlement unit 1, wetland treatment unit 2, and concrete prefabricated connection seat 3 are hoisted into place in the foundation pit, and the assembly is completed in sequence after the measurement and positioning are correct;

[0071] The assembly points are treated for anti-seepage, and backfill soil is carried out at the corresponding position above the artificial wetland.

[0072] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A pipeline-assembled subsurface artificial wetland, characterized by: The artificial wetland is formed by assembling sequentially arranged sedimentation units (1) and a plurality of wetland treatment units (2) in series using a prefabricated concrete connection seat (3); In the sedimentation unit (1), a flow distribution pipe (12) is arranged in a vertical manner in the length direction of the artificial wetland in the sedimentation tank (11); a plurality of flow distribution holes (121) are arranged in an array along the length direction of the flow distribution pipe (12); one end of the flow distribution pipe (12) is sealed by a blind plate (07), and the other end is connected to the main inlet pipe (06), so that sewage enters from the end side of the flow distribution pipe (12); A sedimentation structure (4) is provided in the sedimentation tank (11); a water distribution cavity formed by cooperating with the flow distribution holes (121) in the sedimentation tank (11) is divided into a plurality of sedimentation areas (411) by the sedimentation structure (4) along the length direction of the flow distribution pipe (12), and is used for classified sedimentation of fine impurities; When the prefabricated concrete connection seat (3) is used for assembly, the drainage pipe (05) in the sedimentation unit (1) is adaptively connected to the water inlet pipe (04) in the next wetland treatment unit (2), and the drainage pipe (05) in the previous wetland treatment unit (2) is adaptively connected to the water inlet pipe (04) in the next wetland treatment unit (2).

2. The pipeline-assembled subsurface flow artificial wetland according to claim 1, characterized in that: The sedimentation unit (1) further comprises a water collecting pipe (13) arranged in parallel with the flow distribution pipe (12); The flow distribution pipe (12) is arranged at the upstream side of the sedimentation tank (11), and the main inlet pipe (06) penetrates from the outside and is introduced into the sedimentation tank (11) to communicate with the flow distribution pipe (12); The water collecting pipe (13) is arranged on the downstream side of the sedimentation tank (11); the water collecting pipe (13) sealed at both ends is provided with a plurality of water collecting holes (131) evenly distributed along its length direction; and a drainage pipe (05) is connected in the middle of the water collecting pipe (13) and extends through the sedimentation tank (11) to the outside.

3. The pipeline-assembled subsurface flow artificial wetland according to claim 2, characterized in that: The sedimentation structure (4) comprises a baffle (42) and a plurality of partitions (41); The baffles (42) are arranged in an array in the sedimentation tank (11) along the length direction of the flow distribution pipe (12), and the flow distribution holes (121) on the flow distribution pipe (12) are segmented to form a plurality of sedimentation areas (411) in the sedimentation tank (11); The baffles (41) all extend along the length direction of the artificial wetland, and the baffles (42) are fixed in the sedimentation tank (11) and fixed to one end of each baffle (41) away from the flow distribution pipe (12); The top of the partition (41) is lower than the top of the sedimentation tank (11), the top of the baffle (42) is lower than the top of each partition (41), and the height of each water collection hole (131) is lower than the height of the top of the baffle (42); The bottom end of each partition (41) is fixed to the inner bottom wall of the sedimentation tank (11), and one end is fixed to the inner side wall of the sedimentation tank (11); the bottom end of the baffle (42) is fixed to the inner bottom wall of the sedimentation tank (11), and both ends are respectively fixed to the inner side wall of the sedimentation tank (11).

4. The pipeline-assembled subsurface flow artificial wetland according to claim 3, characterized in that: The bottom of each of the sedimentation areas (411) has a slope (412) inclined toward one side of the flow distribution pipe (12); A sewage pump (43) is provided on the outer wall of the sedimentation tank (11) away from the water collecting pipe (13) and at a position corresponding to each of the sedimentation areas (411); One end of the sewage pump (43) is connected to the corresponding sedimentation area (411) through the second pipeline (432), and the other end is connected to the sewage collection device through the first pipeline (431).

5. The pipeline-assembled subsurface flow artificial wetland according to claim 4, characterized in that: The wetland treatment unit (2) comprises a treatment pool (21), a pair of pipe bodies (22) and a support layer (23); One of the pipe bodies (22) is arranged on the upstream side of the treatment pool (21), and has a water inlet pipe (04) extending through the treatment pool (21) to the outside, and the other pipe body (22) is arranged on the downstream side of the treatment pool (21), and has a drainage pipe (05) extending through the treatment pool (21) to the outside; The tube bodies (22) are arranged in parallel with the flow distribution tubes (12), and holes (221) are arranged in an array on the tube bodies (22); The support layer (23) is arranged in the treatment pool (21) and is located below the two tube bodies (22); a filler area (24) is formed in the treatment pool (21) below the support layer (23); microorganisms are contained in the gaps between the fillers; A planting area (25) is arranged above the support layer (23) in the treatment pool (21) for planting wetland plants.

6. The pipeline-assembled subsurface flow artificial wetland according to claim 5, characterized in that: Both sides of the prefabricated concrete connection seat (3) are respectively provided with mounting grooves (31) for the sedimentation tank (11) or the treatment tank (21) to be matched and snapped into; A connecting hole (32) is provided in the clamping groove (31), and insertion holes (33) are respectively provided on the inner end walls of the two clamping grooves (31), and the insertion holes (33) are used for matching insertion of the water inlet pipe (04) or the drainage pipe (05); The two insertion holes (33) are respectively connected to two ends of the communication hole (32); the inner diameter of the communication hole (32) is smaller than the inner diameter of the insertion hole (33); The sedimentation tank (11) is matched and inserted into the card slot (31) on one side and locked with a fastener (301); the treatment tank (21) is matched and inserted into the card slot (31) on the other side and locked with a fastener (301), thereby completing the assembly and connection of the sedimentation unit (1) and the wetland treatment unit (2); at the same time, the drainage pipe (05) in the sedimentation unit (1) is positioned and matched and inserted into the insertion hole (33) on one side and abuts and seals with the inner end wall of the insertion hole (33); the water inlet pipe (04) in the wetland treatment unit (2) is positioned and matched and inserted into the insertion hole (33) on the other side and abuts and seals with the inner end wall of the insertion hole (33), thereby achieving adaptive connection between the water inlet pipe (04) and the drainage pipe (05); The treatment pool (21) is matched and inserted into the card slot (31) on one side and locked with a fastener (301); the other treatment pool (21) is matched and inserted into the card slot (31) on the other side and locked with a fastener (301); the wetland treatment unit (2) and the wetland treatment unit (2) are assembled and connected; at the same time, the drainage pipe (05) in the wetland treatment unit (2) is positioned and matched and inserted into the insertion hole (33) on one side and abutted and sealed with the inner end wall of the insertion hole (33); the water inlet pipe (04) in the other wetland treatment unit (2) is positioned and matched and inserted into the insertion hole (33) on the other side and abutted and sealed with the inner end wall of the insertion hole (33); the water inlet pipe (04) in the other wetland treatment unit (2) is positioned and matched and inserted into the insertion hole (33) on the other side and abutted and sealed with the inner end wall of the insertion hole (33), thereby realizing adaptive connection between the water inlet pipe (04) and the drainage pipe (05).

7. The pipeline-assembled subsurface flow artificial wetland according to claim 6, characterized in that: A prefabricated concrete gland (01) and a prefabricated concrete base A (02) are assembled and fixed on the upstream side wall of the sedimentation tank (11), and the flow distribution pipe (12) is limitedly clamped between the prefabricated concrete gland (01) and the prefabricated concrete base A (02); A prefabricated concrete base B (03) is assembled and fixed on the downstream side wall of the sedimentation tank (11), and the water collecting pipe (13) is fastened to the water collecting pipe (13) by means of an anti-floating anchor (031); Prefabricated concrete bases B (03) are assembled and fixed on both upstream and downstream side walls of the treatment pool (21), and the pipe bodies (22) are fastened to the corresponding prefabricated concrete bases B (03) via anti-floating anchors (031).

8. The pipeline-assembled subsurface flow artificial wetland according to claim 7, characterized in that: A plurality of guide plates (26) are arranged at intervals in the treatment pool (21) along the length direction of the artificial wetland, and each of the guide plates (26) vertically penetrates the support layer (23) and is fixed to the support layer (23) in a cross-type manner; The guide plates (26) are arranged in an alternating manner, one high and one low; the bottom end of the guide plate (26) at the lower position is fixed to the inner bottom wall of the treatment pool (21), and the top end of the guide plate (26) at the higher position extends to the top of the planting area (25); The two sides of the guide plate (26) are respectively fixed to the inner walls of the treatment pool (21) on both sides; The bottoms of the prefabricated concrete bases B (03) on the inner walls of the upstream and downstream sides of the treatment pool (21) are fixed to the upper surface of the support layer (23).

9. The pipeline-assembled subsurface flow artificial wetland according to claim 5, characterized in that: The top of the sedimentation tank (11) and the top of each of the treatment tanks (21) are kept flush.

10. The pipeline-assembled subsurface flow artificial wetland according to claim 5, characterized in that: The flow distribution pipe (12) is a concrete casting pipe; The water collecting pipe (13) and each of the pipe bodies (22) are made of PE pipes; An inner support frame (08) is fixed inside the water collecting pipe (13) and each of the pipe bodies (22); the cross section of the inner support frame (08) is in the shape of a cross.

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