A pipe-assembled subsurface flow artificial wetland

Abstract

The present invention relates to the technical field of artificial wetlands, specifically a pipeline-assembled subsurface flow artificial wetland, in which the artificial wetland is assembled in series by using a prefabricated concrete connector to assemble a settling unit and a plurality of wetland treatment units arranged in sequence. In the settling unit, a distribution pipe is arranged in a settling tank perpendicular to the length direction of the artificial wetland. The distribution pipe is provided with a plurality of distribution holes arrayed along its length direction. One end of the distribution pipe is sealed with a blind plate, and the other end is connected to the main inlet pipe, so that sewage enters from the end side of the distribution pipe. A settling structure is provided in the settling tank. The present invention can pre-sediment fine impurities in the sewage entering the artificial wetland by arranging a settling unit on the upstream side of the artificial wetland, and regularly suck out the collected sewage by the settling through a 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. Partitions and baffles are provided in the settling tank to partition the sedimentation, so that impurities can be settled in different zones.

Description

Technical Field

[0001] The present 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 sewage treatment field due to their low cost and eco-friendliness. Subsurface flow artificial wetlands are one of the most commonly used types. They use 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 pipeline system caused by large-volume impurities, it is usually necessary to pre-filter the large-volume impurities in the sewage before it enters the artificial wetland. The pre-filtration only removes large-volume impurities, and the filtration accuracy is insufficient. Therefore, there will still be some fine impurities entering the wetland pipeline system with the sewage. The fine impurities include mud and sand particles, metal oxides, scale components such as calcium carbonate and magnesium carbonate, and organic colloids. A large amount of fine impurities flow excessively 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, and concrete 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 objectives, the present invention provides the following technical solutions.

[0007] A pipe-assembled subsurface flow artificial wetland, the artificial wetland is assembled in series by using a concrete prefabricated connecting seat to assemble sedimentation units and several wetland treatment units arranged in sequence. In the sedimentation unit, the distribution pipe is arranged vertically in the length direction of the artificial wetland in the sedimentation tank. There are several distribution holes arranged in an array along the length direction of the distribution pipe. One end of the distribution pipe is sealed with a blind plate, and the other end is connected with the main inlet pipe, so that sewage enters from the end side of the distribution pipe. A sedimentation structure is provided in the sedimentation tank. The water distribution cavity formed in the sedimentation tank in conjunction with the various distribution holes is divided into several sedimentation areas along the length direction of the distribution pipe by the sedimentation structure for classified sedimentation of fine impurities. When assembling with the concrete prefabricated connecting 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, and the water collecting pipe sealed at both ends is provided 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 several 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 several 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 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 end 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 end 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.

[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 collection 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 collection device through the first pipe.

[0012] Preferably, the wetland treatment unit includes a treatment pool, a pair of pipe bodies and a support layer, wherein one pipe body is arranged on the upstream side of the treatment pool, and a water inlet pipe thereon extends to the outside of the treatment pool; the other pipe body is arranged on the downstream side of the treatment pool, and a drainage pipe thereon extends to the outside of the treatment pool; the pipe bodies are arranged parallel to the flow pipe, 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 a card slot for the sedimentation tank or treatment tank to be matched and snapped into, a connecting hole is provided in the card slot, and an insertion hole is provided on the inner end wall of the two card slots respectively, the insertion hole is for the water inlet pipe or the drainage pipe to be matched and inserted, the two insertion holes are respectively connected to 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 drainage 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 to achieve adaptive connection of the water inlet pipe and the drainage 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 to achieve 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 distribution pipe limit card is installed between the prefabricated concrete pressure cover and the prefabricated concrete base A, and a prefabricated concrete base B is assembled and fixed on the downstream side wall of the sedimentation tank. The water collecting pipe is fastened to the water 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.

[0018] Preferably, a number of guide plates are arranged at intervals along the length direction of the artificial wetland in the treatment pool, and each guide plate vertically penetrates the support layer and is fixed to the support layer in a cross-type manner. 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, and 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 is fixed to the upper surface of the support 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 made of PE pipe, and the water collecting pipe and each pipe body are fixed with an internal support frame, and the cross section of the internal support frame is a cross-section.

[0021] Compared with the prior art, the present invention has the following beneficial effects.

[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 provides a sedimentation unit on the upstream side of the artificial wetland, which can pre-sediment fine impurities in the sewage entering the artificial wetland, and regularly suck out the collected sewage through the sewage pump, thereby reducing the burden of subsequent treatment steps of the artificial wetland and improving the sewage treatment efficiency of the artificial wetland. In addition, the sewage is introduced from one side of the distribution pipe through the main inlet pipe, and partitions and baffles are provided in the sedimentation tank to divide the sedimentation into zones. Taking into account the different gravity and inertia of impurities, the impurities can be settled in zones, which facilitates the subsequent targeted classification and treatment of the impurities.

[0024] Furthermore, baffles are fixedly connected to each partition to form a support structure. This support structure is fixed to the inner wall of each location in the sedimentation tank, providing effective support for the sedimentation tank. This improves the overall structural strength of the sedimentation unit, making the sedimentation tank less prone to deformation and highly stable. The partitions and baffles serve as both barriers to the zonal sedimentation of fine impurities and supports that increase the structural strength of the sedimentation unit, achieving two goals at once.

[0025] When the present invention utilizes the prefabricated concrete connector to assemble the sedimentation tank and the treatment tank, and vice versa, the two adjacent tank bodies are respectively fitted into the mounting grooves on both sides of the prefabricated concrete connector. The prefabricated concrete connector firmly connects the adjacent tank bodies to form a whole. When facing external environmental factors such as water flow impact and ground subsidence, the tank bodies are ensured not to separate or misalign, thereby improving the anti-interference ability of the artificial wetland, ensuring its stability and reliability during operation, and extending 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 the assembly joint of 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 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 perspective 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 Schematic diagram of the internal structure of the treatment pool in the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of the cross section of the structure shown;

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

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

[0036] Figure 10 Detailed structural diagram of the prefabricated concrete connector in the present invention;

[0037] Figure 11 for Figure 10 Schematic diagram of the cross section of the structure shown;

[0038] Figure 12 for Figure 1 Schematic diagram of the cross section of the structure shown;

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

[0040] Figure 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. Hole; 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. Insertion hole; 4. Settlement structure; 41. Partition; 411. Settlement area; 412. Slope; 42. Baffle; 43. Sewage pump; 431. First pipeline; 432. Second pipeline. DETAILED DESCRIPTION

[0042] See also Figures 1-14 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 composed of a settling 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 settling unit 1 is arranged on the upstream side and is used to pre-sediment and discharge the 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. There are a number of flow distribution holes 121 arranged in an array along its length direction on 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 that passes through 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 covered area through which the sewage flows 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 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 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 distribution pipe 12, and at the same time, the distribution holes 121 on the distribution pipe 12 are segmented 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 distribution pipe 12 into multiple sections, each section contains multiple distribution holes 121, and each section on the distribution pipe 12 corresponds one-to-one to the position of the sedimentation area 411. 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 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 pre-coarse filtration, the volume of fine impurities mixed in the sewage is roughly the same, but the density of different impurities is 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 have a greater inertia when entering the distribution pipe 12 with the sewage at a certain flow rate. Under the push of the high-speed water flow, they maintain a trend of moving toward the side of the blind plate 07. The state change of the water flowing out of the distribution hole 121 into the sedimentation tank 11 is not enough to overcome the greater inertia of the impurities and cause them to change direction and flow out directly from the distribution hole 121. When the sewage flows in the distribution pipe 12 to near the blind plate 07, the flow rate decreases and the inertial effect 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 distribution holes 121 in different sections of the distribution pipe 12. For example, fine impurities such as organic colloids flow from the distribution holes 121 in the section of the distribution 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 distribution holes 121 in the middle section of the distribution pipe 12 into the sedimentation area 411 in the middle. Heavier impurities such as mud and sand particles flow from the distribution holes 121 in the section of the distribution 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, realizing the pre-sedimentation treatment of the fine impurities to reduce the burden of excessive impurities in the water on subsequent treatment.

[0050] The bottom end of each baffle 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 to each baffle 41 to form a support body. This support body is fixed to the inner wall of the sedimentation tank 11 at all positions, and cooperates with the sedimentation tank 11 to provide effective support, thereby improving the overall structural strength of the sedimentation unit 1, making the sedimentation tank 11 less prone to deformation and highly stable. At the same time, the baffles 41 and 42 serve as both barriers for the zonal sedimentation of fine impurities and as supports that increase the structural strength of the sedimentation unit 1, achieving two goals at one.

[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. Figure 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 discharged 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; 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; the pipe bodies 22 are arranged parallel to 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 water 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 water 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 below the support layer 23 in the treatment pool 21. 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 supporting layer 23 is used to separate the planting area 25 and the filling area 24. The supporting layer 23 serves as the load-bearing part of the planting area 25 and the wetland plants.

[0056] When sewage enters the treatment tank 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 at the same time 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 at the same time 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] In the treatment pool 21, a number of guide plates 26 are arranged at intervals along the length direction of the artificial wetland. Each guide plate 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 alternately, one high and one low. The bottom end of the lower guide plate 26 is fixed to the bottom wall of the treatment pool 21, and the top end of the higher guide plate 26 extends to the top of the planting area 25 to ensure that the water flow can grind the roots of the wetland plants. After entering the treatment pool 21, the water flow uses the diversion effect of the guide plate 26 to flow up and down in the treatment pool 21. The sewage flows in the following direction: Figure 14 As shown by the solid arrows in the figure, the water flow is ensured to alternately flow through the filling area 24 and the planting area 25 multiple times in the treatment pool 21, thereby extending the treatment process in the treatment pool 21 and improving the effect of the single wetland treatment unit 2 on the water body.

[0058] When assembling using the prefabricated concrete connector 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 Figure 10 and Figure 11 As shown, both sides of the prefabricated concrete connecting 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, and a connecting hole 32 is provided in the card slot 31. The inner end walls of the two card slots 31 are respectively provided with an insertion hole 33, and the insertion hole 33 is for the water inlet pipe 04 or the drainage pipe 05 to match and insert. The two insertion holes 33 are respectively connected to 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 assembling the sedimentation unit 1 and the wetland treatment unit 2 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 with the fastener 301, and the 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 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 sealed against 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 sealed against the inner end wall of the insertion hole 33 to achieve adaptive connection between the water inlet pipe 04 and the drainage pipe 05.

[0061] When assembling the wetland treatment unit 2 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 of 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 sealed against 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 sealed against 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 fastener, or a latch.

[0063] When the sedimentation tank 11 and the treatment tank 21 and the treatment tank 21 are assembled and paired using the prefabricated concrete connector 3, the adjacent two tank bodies are respectively fitted into the mounting grooves 31 on both sides of the prefabricated concrete connector 3. The prefabricated concrete connector 3 is used to firmly connect 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, thereby improving the anti-interference ability of the artificial wetland, ensuring its stability and reliability during operation, and improving the service life of the artificial wetland as a whole. By using the structure of the water inlet pipe 04 and the drainage pipe 05, respectively, and the insertion hole 33, 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 pipes. No additional connectors are required to connect the pipes, and the series connection of the entire artificial wetland can be realized, reducing the difficulty of pipe layout. The prefabricated concrete connector 3 serves as the assembly joint of each tank body and provides a basis for the connection of adjacent pipes, killing two birds with one stone.

[0064] like Figure 4 、 Figure 8 and Figure 9 As shown, a prefabricated concrete pressure cap 01 and a prefabricated concrete base A02 are assembled and fixed on the upstream side wall of the sedimentation tank 11, and the flow pipe 12 is limited and mounted between the prefabricated concrete pressure cap 01 and the prefabricated concrete base A02, and the prefabricated concrete pressure cap 01 and the prefabricated concrete base A02 have grooves that match the flow pipe 12. The flow pipe 12 is embedded and assembled between the prefabricated concrete pressure cap 01 and the prefabricated concrete base A02 to improve the ability of the flow pipe 12 to resist water flow impact. 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 prefabricated 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 prefabricated concrete bases B03 by anti-floating anchors 031 respectively. The prefabricated concrete base B03 has 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 prefabricated 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, the two sides of the guide plate 26 are respectively fixed to the inner walls of the treatment tank 21, and the bottoms of the precast concrete bases B03 on the inner walls on 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. The two sides of the support body are respectively fixed to the precast concrete bases B03 and to the inner walls of the treatment tank 21, providing effective support in the treatment tank 21, making the treatment tank 21 not easy to deform and highly stable.

[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 flowing 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 to ensure 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 sewage inside the artificial wetland from overflowing and causing pollution to the surrounding soil environment.

[0067] In addition, the distribution pipe 12 is made of 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 pipe as the distribution pipe 12 has strong impact resistance. The water collection pipe 13 and each pipe body 22 are made of PE pipe. PE pipe is cheap and light, which reduces construction cost and difficulty. At the same time, the water collection 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 M-shape. The internal support frame 08 is used to provide support to the water collection pipe 13 and the pipe body 22 internally, so that the water collection 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 after excavation reaches the designed elevation, and arrange the prefabricated foundation;

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

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

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, 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 flow 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 base (3); In the sedimentation unit (1), a flow distribution pipe (12) is arranged in a vertical direction in the length direction of the artificial wetland in the sedimentation tank (11), and 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), and a water distribution cavity formed in the sedimentation tank (11) in cooperation with the flow distribution holes (121) is divided into a plurality of sedimentation zones (411) along the length direction of the flow distribution pipe (12) by the sedimentation structure (4), for classified sedimentation of fine impurities; When the concrete prefabricated connection seat (3) is used for assembly, the drainage pipe (05) in the sedimentation unit (1) is adaptively docked and connected with 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 docked and connected with the water inlet pipe (04) in the next wetland treatment unit (2); The sedimentation unit (1) further comprises a water collecting pipe (13) arranged in parallel with the flow distribution pipe (12), the water collecting pipe (13) being arranged on the downstream side of the sedimentation tank (11), and the water collecting pipe (13) having sealed ends is provided with a plurality of water collecting holes (131) along its length direction; The sedimentation structure (4) includes a baffle (42) and a plurality of partitions (41); The baffles (42) are arranged in an array along the length direction of the flow distribution pipe (12) in the settling tank (11), and the flow distribution holes (121) on the flow distribution pipe (12) are segmented to form a plurality of settling areas (411) in the settling 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 each partition (41) is lower than the top of the sedimentation tank (11), the top of each 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 each baffle (42); 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 it to the outside of the treatment pool (21); the other pipe body (22) is arranged on the downstream side of the treatment pool (21), and has a drainage pipe (05) extending through it to the outside of the treatment pool (21); 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 provided in the treatment pool (21) and is located below the two tube bodies (22); a filler area (24) is formed below the support layer (23) in the treatment pool (21); and 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.

2. The pipeline-assembled subsurface flow artificial wetland according to claim 1, characterized in that: The flow distribution pipe (12) is arranged on the upstream side of the sedimentation tank (11), and the main inlet pipe (06) is introduced from the outside into the sedimentation tank (11) and communicates with the flow distribution pipe (12); The middle of the water collecting pipe (13) is connected to a drainage pipe (05) that extends through and to the outside of the sedimentation tank (11).

3. The pipeline-assembled subsurface flow artificial wetland according to claim 2, characterized in that: 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).

4. The pipeline-assembled subsurface flow artificial wetland according to claim 3, characterized in that: The bottom of each of the settling 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 pipe (432), and the other end is connected to the sewage collection device through the first pipe (431).

5. The pipeline-assembled subsurface flow artificial wetland according to claim 1, characterized in that: Both sides of the prefabricated concrete connection seat (3) are provided with mounting grooves (31) for the sedimentation tank (11) or the treatment tank (21) to be matched and snapped into. A communicating hole (32) is provided in the clamping slot (31), and an inserting hole (33) is provided on the inner end wall of each of the two clamping slots (31), wherein the inserting hole (33) is for the water inlet pipe (04) or the drain pipe (05) to be inserted into. The two insertion holes (33) are respectively connected to the two ends of the communication hole (32), and 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); the sedimentation unit (1) and the wetland treatment unit (2) are assembled and connected; 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 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 abutted and sealed with the inner end wall of the insertion hole (33); thus, the water inlet pipe (04) and the drainage pipe (05) are adaptively connected; 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); thereby realizing the adaptive connection between the water inlet pipe (04) and the drainage pipe (05).

6. The pipeline-assembled subsurface flow artificial wetland according to claim 5, 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 fixed in an assembled manner on the downstream side wall of the sedimentation tank (11), and the water collecting pipe (13) is fastened to the water collecting pipe (13) via 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 body (22) is fastened to the corresponding prefabricated concrete bases B (03) via anti-floating anchors (031).

7. The pipeline-assembled subsurface flow artificial wetland according to claim 6, characterized in that: A plurality of guide plates (26) are arranged at intervals along the length direction of the artificial wetland in the treatment pool (21), 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 pattern of one high and one low, the bottom end of the guide plate (26) at the lower position is fixed to the bottom wall of the treatment pool (21), and the top end of the guide plate (26) at the higher position extends to above the planting area (25); Both sides of the guide plate (26) are respectively fixed to the inner walls of both sides of the treatment pool (21); The bottoms of the prefabricated concrete bases B (03) 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).

8. The pipeline-assembled subsurface flow artificial wetland according to claim 1, characterized in that: The top of the sedimentation tank (11) and the top of each treatment tank (21) are kept flush.

9. The pipeline-assembled subsurface flow artificial wetland according to claim 1, 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 in the water collecting pipe (13) and each of the pipe bodies (22), and the cross section of the inner support frame (08) is in the shape of a cross.

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