Vertical underflow system

Abstract

This invention discloses a vertical subsurface flow system, relating to the technical field of constructed wetland systems. The vertical subsurface flow system includes a water storage system, a sedimentation system, a filtration tank, and a collection area. The sedimentation system includes a settling tank, a sedimentation chamber, an equipment room, and a pump room. The water storage system has an inlet well connected to the settling tank. The equipment room has a top-pump assembly for extracting water from the top of the settling tank. The settling tank and sedimentation tank are connected. The pump room has an outlet system for extracting water from the top of the sedimentation tank. The outlet system is connected to the filtration tank. The filtration tank includes several vertical subsurface flow filtration units connected sequentially from high to low. The vertical subsurface flow filtration units are connected to the collection area, which has an outlet. This application can reduce clogging of the vertical subsurface flow filtration units after prolonged use.

Description

Technical Field

[0001] This invention relates to the technical field of constructed wetland systems, and in particular to a vertical subsurface flow system. Background Technology

[0002] Constructed wetland systems are artificially built and controlled wetland structures similar to marshes. Wastewater and sludge are systematically introduced onto these artificial wetlands. As the wastewater and sludge flow in a specific direction, the system utilizes the synergistic physical, chemical, and biological processes of soil, artificial media, plants, and microorganisms to treat the wastewater and sludge. Vertical subsurface flow systems are currently a leading type of constructed wetland system, characterized by low investment and construction costs and low operating technology requirements. They can also be integrated into landscaping, resulting in aesthetically pleasing designs.

[0003] In related technologies, an ecological vertical flow constructed wetland system is disclosed, comprising a water storage area, a primary treatment pond, a secondary treatment pond, and a collection area arranged sequentially along the water conveyance direction; an inlet is provided at the top of the water inlet end of the water storage area, and the top of the water outlet end is connected to the top of the primary treatment pond through an overflow weir; the primary treatment pond is provided with a first impermeable layer, a first coarse-grained matrix layer, a first fine-grained matrix layer, and a first thin soil layer arranged sequentially from bottom to top, and a first emergent plant is planted on the first thin soil layer; the primary treatment pond and the secondary treatment pond are separated by an isolation chamber, the lower part of which includes at least two channels arranged along the water conveyance direction, gates installed on the channels, and perforated flower walls installed at both ends of the channels; each gate is connected to its motor by a gate rope at the top. The gate ropes and motors are all installed on the isolation chamber. The secondary treatment tank has treatment zones with the same number of channels. Each treatment zone has a second impermeable layer, a second coarse-grained matrix layer, a second fine-grained matrix layer, and a second thin soil layer arranged sequentially from bottom to top. The matrix used in the second fine-grained matrix layer of each treatment zone is different. A second emergent plant is planted on the second thin soil layer of each treatment zone. A filter wall is set on each second coarse-grained matrix layer near the water collection area. The wall surface of each filter wall can cover the side end of the corresponding second fine-grained matrix layer. A water outlet is set on the upper outer side of each filter wall. The water outlet is connected to the water collection area through a water outlet pipe. A drainage outlet is also set on the outer side of the water collection area.

[0004] However, since the aforementioned wetland systems require continuous operation over long periods of time, filtered impurities can accumulate in the wetland's packing material, easily leading to clogging of the wetland system. Summary of the Invention

[0005] To address the problem of wetland systems being prone to clogging after long-term operation, this application provides a vertical subsurface flow system.

[0006] This application provides a vertical subsurface flow system, which adopts the following technical solution:

[0007] A vertical subsurface flow system includes a water storage system, a sedimentation system, a filtration tank, and a collection area. The sedimentation system includes a settling tank, a sedimentation chamber, an equipment room, and a pump room. The water storage system has an inlet well connected to the settling tank. The equipment room has a top-pumping assembly for extracting water from the top of the settling tank. The settling tank and the sedimentation tank are connected. The pump room has an outlet system for extracting water from the top of the sedimentation tank. The outlet system is connected to the filtration tank. The filtration tank includes several vertical subsurface flow filtration units connected sequentially from high to low. The vertical subsurface flow filtration units are connected to the collection area, and the collection area has an outlet.

[0008] By adopting the above technical solution, when the water collected by the water storage system flows into the sedimentation system from the inlet well, it first settles in the sedimentation tank. The water is located at the top of the sedimentation tank, while impurities settle to the bottom. When the water quality at the top of the sedimentation tank is good, it can be discharged without treatment. Therefore, the top water pumping unit can directly pump the water from the top of the sedimentation tank into the river, reducing treatment steps. When the water quality at the top of the sedimentation tank is poor, further treatment is required before discharge. Therefore, instead of pumping the water from the top of the sedimentation tank, the water in the sedimentation tank flows into the sedimentation tank for secondary sedimentation to remove impurities of larger mass and particle size. Then, the water in the sedimentation tank is pumped to the filtration tank by the effluent system. Through the sequential filtration of several vertical subsurface flow filtration units, impurities in the water are removed, and then discharged through the collection area and outlet. Because this application pre-sedimentates and settles the water before it enters the vertical subsurface flow filtration units, removing most of the impurities of larger mass and particle size, it can reduce the clogging of the vertical subsurface flow filtration units after long-term use.

[0009] In one specific implementation scheme, the vertical subsurface flow filtration unit includes a unit pool and a packing layer. The packing layer is located inside the unit pool and is planted with emergent plants. A water collection ditch is provided at the bottom of the unit pool and is connected to an adjacent unit pool. A drainage pipe is provided in the water collection ditch, and the water outlet system is connected to the unit pool.

[0010] By adopting the above technical solution, the roots of emergent plants are dispersed in the packing layer. Therefore, the packing layer and emergent plants can filter impurities in the water. The emergent plants and microorganisms work together to decompose impurities in the packing layer, further reducing the clogging of the packing layer after long-term use. The water collection ditch can collect the water filtered by the packing layer. The water in the water collection ditch then flows quickly to the next unit pool through the diversion and drainage pipe for the next filtration. After multiple stages of filtration, the water quality meets the discharge standards and is then transported to the collection area for discharge. Therefore, by adopting the above solution, not only can impurities in the water be further filtered, but the clogging of the packing layer can also be further reduced.

[0011] In one specific implementation scheme, the filler layer includes a cover layer, a sand and gravel graded filter layer, and a crushed stone drainage layer arranged sequentially from top to bottom. The crushed stone drainage layer is inserted into the water collection ditch. The cover layer is a layer made of limestone, the sand and gravel graded filter layer is a layer made of sand and gravel, and the crushed stone drainage layer is a layer made of crushed stones.

[0012] By adopting the above technical solution, limestone, a commonly used stone material in the construction industry, can not only filter impurities in water in advance, but also reduce the impact of water flow on the graded sand and gravel filter layer. The graded sand and gravel filter layer, which uses sand and gravel of different particle sizes and materials in a certain proportion, can fully filter impurities in the water and improve the quality of the filtered water. The crushed stone drainage layer can support the graded sand and gravel filter layer and cover layer, and also allow the filtered water to pass through and enter the collection ditch, thereby discharging the filtered water. Therefore, by using the above-mentioned filler layer, the filtration effect and service life of the vertical subsurface flow system can be improved.

[0013] In one specific implementation scheme, the top water extraction assembly includes a top water extraction pump, a top water extraction pipe, and a discharge pipe. An installation platform is fixedly connected to the inner side wall of the equipment chamber. The top water extraction pump is installed on the installation platform. One end of the top water extraction pipe is inserted into the sedimentation tank, and the other end of the top water extraction pipe is connected to the inlet end of the top water extraction pump. One end of the discharge pipe is connected to the outlet end of the top water extraction pump, and the other end of the discharge pipe penetrates through the side wall of the equipment chamber.

[0014] By adopting the above technical solution, the top-mounted water pump is installed on the mounting platform inside the equipment room, which prevents water from submerging the pump and thus reduces damage. The top-mounted water pipe is used to extract water from the top of the sedimentation tank, and the discharge pipe is used to discharge the water into the river. Therefore, water that meets the quality standards in the sedimentation tank can be directly discharged into the river, reducing subsequent filtration steps.

[0015] In one specific implementation scheme, the water outlet system includes an outlet pump, an outlet pipe, a standby pump, a standby pipe, and a distribution pipe. The outlet pump, the standby pump, and the distribution pipe are all located in the pump chamber. The outlet pipe and the standby pipe are both inserted into the sedimentation tank. The outlet pipe is connected to the inlet end of the outlet pump, and the standby pipe is connected to the inlet end of the standby pump. The outlet ends of the outlet pump and the standby pump are both connected to the distribution pipe, and the distribution pipe is connected to the vertical subsurface flow filter unit.

[0016] By adopting the above technical solution, the outlet pump and the standby pump can work alternately, which facilitates the maintenance or replacement of one of the pumps. The outlet pipe, the standby pipe and the distribution pipe work together to transport the water in the sedimentation tank to the vertical subsurface flow filtration unit for filtration.

[0017] In one specific implementation, the vertical subsurface flow system further includes a dosing assembly, which includes a dosing pump, a main dosing pipe, branch dosing pipes, a water pipe, a flushing water pipe, and an interface pipe for delivering the chemicals. The dosing pump is installed on the inner wall of the pump chamber. One end of the water pipe is inserted into the sedimentation tank, and the other end of the water pipe is connected to the inlet of the dosing pump. One end of the main dosing pipe is connected to the outlet of the dosing pump. Several branch dosing pipes are connected to the end of the main dosing pipe away from the dosing pump. The branch dosing pipes are inserted into the sedimentation tank and settling tank. The interface pipe is connected to the main dosing pipe, and a chemical storage device is installed on the end of the interface pipe away from the main dosing pipe. A dosing valve is installed on the interface pipe. The flushing water pipe is installed on the outer wall of the settling tank, with one end inserted into the settling tank and the other end located outside the settling tank.

[0018] By adopting the above technical solution, chemicals need to be added to the sedimentation tank and settling tank during sedimentation, settling, or cleaning to accelerate sedimentation, settling, or descaling. Therefore, this application also uses the above-mentioned chemical dosing component. The required chemical is simply input into the main delivery pipe through the interface pipe, and the chemical pump draws water from the sedimentation tank through the water delivery pipe and inputs it into the main delivery pipe. The water flow carries the chemical and enters the sedimentation tank and settling tank through the flushing water pipe. Therefore, using the above-mentioned chemical dosing component not only facilitates the addition of chemicals to the sedimentation tank and settling tank, improving sedimentation and settling effects, but also facilitates the cleaning of the sedimentation tank and settling tank, aiding in descaling.

[0019] In one specific implementation scheme, the water collection area includes a water collection well and a water outlet well. The vertical subsurface flow filter unit is connected to the water collection well. A water collection pump is installed inside the water collection well. A valve chamber is installed on the outer wall of the water collection well. The outlet end of the water collection pump is connected to a water collection pipe. The water collection pipe passes through the valve chamber. A water collection valve is installed on the water collection pipe. The water collection valve is located in the valve chamber. The water collection pipe is inserted into the water outlet well. The water outlet is located on the side wall of the water outlet well.

[0020] By adopting the above technical solution, since the outlet is generally facing the river, when river water overflows into the catchment area, it may cause pollution or blockage. Therefore, this application sets up a collection well and an outlet well. River water will only overflow into the outlet well and will not enter the collection well, thereby reducing pollution or blockage of the collection well. Activating the drainage pump and drainage valve can input water from the collection well into the outlet well, which can flush the outlet well and reduce pollution or blockage. Therefore, by adopting the above-mentioned catchment area, not only can the filtered water be discharged smoothly into the river, but the pollution or blockage of the catchment area by river water can also be reduced.

[0021] In one specific implementation, the top of the inlet well is provided with an inlet cover, the inlet cover has an opening, the inlet cover is provided with a top cover for closing the opening, one side of the top cover is rotatably connected to the inlet cover, the other side of the top cover is detachably connected to the inlet cover, and a filter screen is provided inside the inlet.

[0022] By adopting the above technical solution, and with the inlet cover and top cover in place, water from the storage system can be transferred to the sedimentation system when filtration is needed. When filtration is not required, closing the top cover prevents water from flowing into the inlet well. Therefore, the water level in the storage system can be controlled, facilitating the maintenance of the ground landscape. When the top cover is opened and water flows into the inlet well, the filter screen can remove impurities, further reducing clogging of the vertical subsurface flow system.

[0023] In one specific implementation scheme, an overflow device is provided between the sedimentation tank and the settling tank. The overflow device includes a through pipe and an overflow pipe. One end of the through pipe is inserted into the sedimentation tank, and the other end of the through pipe is inserted into the settling tank. The overflow pipe is arranged vertically in the sedimentation tank, and the through pipe is connected to the overflow pipe.

[0024] By adopting the above technical solution, water in the sedimentation tank enters the through pipe through the upper or lower end of the overflow pipe, and then flows into the sedimentation tank through the through pipe. Therefore, only the water that is higher than the through pipe can flow into the sedimentation tank, which helps to reduce the amount of sediment at the bottom of the sedimentation tank from entering the sedimentation tank, thereby further improving sedimentation efficiency and sedimentation effect.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Before entering the vertical submersible filter unit, this application pre-sedimentation and sedimentation are carried out to remove most of the large-mass and large-particle impurities in the water, which helps to reduce the clogging of the vertical submersible filter unit after long-term use;

[0027] 2. The packing layer used in this application can improve the filtration effect and the service life of the vertical subsurface flow system;

[0028] 3. The chemical dosing component used in this application not only facilitates the addition of chemicals to sedimentation tanks and settling tanks to improve sedimentation and settling effects, but also facilitates the cleaning of sedimentation tanks and settling tanks, which helps with descaling. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the vertical subsurface flow system in the embodiments of this application.

[0030] Figure 2This is a schematic diagram of the sedimentation system and filtration tank in the embodiments of this application.

[0031] Figure 3 This is a schematic diagram of the structure of the inlet well in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the precipitation system in an embodiment of this application.

[0033] Figure 5 This is a schematic diagram of the overflow component and interface pipe in the embodiments of this application.

[0034] Figure 6 This is a schematic diagram of the water outlet system in an embodiment of this application.

[0035] Figure 7 This is a cross-sectional view of the filter tank and water collection area in an embodiment of this application.

[0036] Figure 8 This is an exploded view of the vertical undercurrent filter unit in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Water storage system; 11. Inlet well; 12. Inlet cover; 121. Opening; 122. Top cover; 123. Filter screen; 13. Pond; 2. Sedimentation system; 21. Sedimentation tank; 22. Sedimentation tank; 23. Equipment room; 231. Mounting platform; 24. Pump room; 241. Boss; 25. Top pump assembly; 251. Top pump; 252. Top pump pipe; 253. Discharge pipe; 26. Water outlet system; 261. Water outlet pump; 262. Water outlet pipe; 263. Standby pump; 264. Standby pipe; 265. Branch pipe; 266. Main branch pipe; 267. Inlet pipe; 268. Branch pipe; 27. Overflow component; 271. Through pipe; 272. Overflow pipe 3. Filter tank; 31. Vertical subsurface flow filter unit; 32. Unit tank; 321. Water collection ditch; 322. Drainage pipe; 33. Packing layer; 331. Cover layer; 332. Gravel gradation filter layer; 333. Crushed stone drainage layer; 4. Water collection area; 41. Outlet; 42. Water collection well; 421. Water collection pump; 422. Valve chamber; 423. Water collection pipe; 424. Water collection valve; 425. Control room; 426. Control valve; 43. Outlet well; 5. Chemical dosing assembly; 51. Chemical delivery pump; 52. Main chemical delivery pipe; 53. Branch chemical delivery pipe; 54. Water delivery pipe; 55. Flushing water pipe; 56. Interface pipe; 561. Chemical storage device; 562. Chemical delivery valve. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] This application discloses a vertical undercurrent system.

[0042] Reference Figure 1 and Figure 2 The vertical subsurface flow system includes a water storage system 1, a sedimentation system 2, a filtration tank 3, and a water collection area 4. All four systems are located on the ground. The water storage system 1 collects surface water and then transports it to the sedimentation system 2. In the sedimentation system 2, the water undergoes sedimentation, with larger impurities settling at the bottom. The water at the top of the sedimentation system 2 is then transported to the filtration tank 3, where impurities are filtered out. The filtered water is then transported to the water collection area 4 for discharge.

[0043] The water storage system 1 includes a pond 13, which is located on the ground. An inlet well 11 is provided on the bottom wall of the pond 13, and the inlet well 11 is connected to the sedimentation system 2.

[0044] Reference Figure 2 and Figure 3 An inlet cover 12 is provided on the top of the inlet well 11, which closes the top of the inlet well 11. The inlet cover 12 has an opening 121, and a filter screen 123 is provided inside the opening 121. The filter screen 123 is welded to the peripheral wall of the inlet. A top cover 122 is hinged to the inlet cover 12.

[0045] Rotate the top cover 122. When the top cover 122 abuts against and is fixed together with the inlet cover 12, the top cover 122 closes the opening 121. Open the top cover 122, and the water in the pond 13 can enter the inlet well 11. The filter screen 123 prevents debris in the water from entering the inlet well 11.

[0046] Reference Figure 3 and Figure 4 The sedimentation system 2 includes a sedimentation tank 21, a sedimentation tank 22, an equipment room 23, and a pump room 24. Both sedimentation tanks 21 and 22 are located on the ground and are interconnected. The equipment room 23 is located on the outer wall of sedimentation tank 21, and the pump room 24 is located on the outer wall of sedimentation tank 22. The bottom of the inlet well 11 is connected to the top of sedimentation tank 21.

[0047] Reference Figure 4 and Figure 5 An overflow component 27 is provided on the side wall between the settling tank 21 and the sedimentation tank 22. The overflow component 27 includes a through pipe 271 and an overflow pipe 272. The through pipe 271 is located inside the side wall between the settling tank 21 and the sedimentation tank 22. One end of the through pipe 271 penetrates the inner side wall of the settling tank 21 and is inserted into the settling tank 21. The other end of the through pipe 271 penetrates the inner side wall of the sedimentation tank 22 and is inserted into the sedimentation tank 22. The overflow pipe 272 is located inside the settling tank 21 and is placed vertically. The middle part of the overflow pipe 272 is welded to the end of the through pipe 271, and the overflow pipe 272 is connected to the through pipe 271.

[0048] The equipment room 23 is equipped with a top-mounted water pump assembly 25, which includes a top-mounted water pump 251, a top-mounted water pipe 252, and a discharge pipe 253. An installation platform 231, a concrete platform, is provided on the inner wall of the equipment room 23. The top-mounted water pump 251 is riveted to the installation platform 231. One end of the top-mounted water pipe 252 is inserted into the inlet of the top-mounted water pump 251, and the other end of the top-mounted water pipe 252 passes through the side walls of the equipment room 23 and the settling tank 21 and is inserted into the settling tank 21. The end of the top-mounted water pipe 252 away from the top-mounted water pump 251 is located at the top of the settling tank 21. One end of the discharge pipe 253 is inserted into the outlet of the top-mounted water pump 251, and the other end of the discharge pipe 253 is connected to a river channel.

[0049] The water outlet system 26 includes an outlet pump 261, an outlet pipe 262, a standby pump 263, a standby pipe 264, and a distribution pipe 265. The outlet pump 261 and the standby pump 263 are both riveted to the bottom wall of the pump chamber 24. One end of the outlet pipe 262 is inserted into the inlet of the outlet pump 261, and the other end of the outlet pipe 262 passes through the side wall of the pump chamber 24 and the sedimentation tank 22 and is inserted into the sedimentation tank 22. The end of the outlet pipe 262 furthest from the outlet pump 261 is located at the top of the sedimentation tank 22. One end of the standby pipe 264 is inserted into the inlet of the standby pump 263, and the other end of the standby pipe 264 passes through the side wall of the pump chamber 24 and the sedimentation tank 22 and is inserted into the sedimentation tank 22. The end of the standby pipe 264 furthest from the outlet pump 261 is located at the top of the sedimentation tank 22.

[0050] Reference Figure 5 and Figure 6The water distribution pipe 265 includes a main water distribution pipe 266, an inlet pipe 267, and branch water distribution pipes 268. There are two inlet pipes 267, both of which are connected to the main water distribution pipe 266. Both ends of the main water distribution pipe 266 are closed. One inlet pipe 267 is connected to the outlet end of the outlet pump 261, and the other inlet pipe 267 is connected to the outlet end of the standby pump 263. There are several branch water distribution pipes 268, all of which are connected to the main water distribution pipe 266. All branch water distribution pipes 268 are connected to the filter tank 3.

[0051] Reference Figure 4 and Figure 5 A dosing assembly 5 is installed on the inner wall of the pump chamber 24. The dosing assembly 5 includes a dosing pump 51, a main dosing pipe 52, branch dosing pipes 53, a water pipe 54, a flushing water pipe 55, and an interface pipe 56. A boss 241 is provided on the inner wall of the pump chamber 24, and the dosing pump 51 is riveted to the boss 241. The water pipe 54 passes through the side wall of the pump chamber 24, with one end inserted into the upper end of the sedimentation tank 22 and the other end connected to the inlet of the dosing pump 51. The main dosing pipe 52 is riveted to the outer wall of the sedimentation tank 22, with one end connected to the outlet of the dosing pump 51. The branch dosing pipe 53 is welded to the end of the main dosing pipe 52 furthest from the dosing pump 51. There are two branch dosing pipes 53, one inserted into the sedimentation tank 22 and the other into the settling tank 21. One end of the interface pipe 56 is welded to the drug delivery main pipe 52, and the other end of the interface pipe 56 is equipped with a drug storage device 561. A drug delivery valve 562 is installed on the interface pipe 56.

[0052] The flushing water pipe 55 is riveted to the outer wall of the settling tank 21. The flushing water pipe 55 penetrates the side wall of the settling tank 21. One end of the flushing water pipe 55 is inserted into the settling tank 21 and extends to the bottom of the settling tank 21. The other end of the flushing water pipe 55 is located outside the settling tank 21.

[0053] Open the delivery valve 562 to transfer the chemicals from the storage device 561 into the delivery main pipe 52. Then close the delivery valve 562 and turn on the delivery pump 51. The pump draws water from the top of the sedimentation tank 22 and transfers it into the delivery main pipe 52. The water flow carries the chemicals into the sedimentation tank 21 and sedimentation tank 22, accelerating the flocculation and sedimentation of particulate matter in the sedimentation tank 21 and sedimentation tank 22. When it is necessary to clean the sedimentation tank 21, the flushing water pipe 55 can be connected to the water supply system (not shown in the figure) to introduce clean water into the bottom of the sedimentation tank 22 to clean the sedimentation tank 21.

[0054] Reference Figure 6 and Figure 7 The filter tank 3 includes several vertical subsurface flow filter units 31, all of which are connected sequentially from high to low. The branch pipes 268 correspond one-to-one with the vertical subsurface flow filter units 31.

[0055] Reference Figure 7 and Figure 8 The vertical subsurface flow filtration unit 31 includes a unit pool 32 and a packing layer 33. The unit pool 32 is made of concrete and is located on the ground. A water collection ditch 321 is provided at the bottom of the unit pool 32, and the water collection ditch 321 is connected to the adjacent unit pool 32. The packing layer 33 is located inside the unit pool 32 and includes a cover layer 331, a sand and gravel graded filter layer 332, and a gravel drainage layer 333. The gravel drainage layer 333 is located at the bottom of the unit pool 32, the sand and gravel graded filter layer 332 is located on the gravel drainage layer 333, and the cover layer 331 is located on the sand and gravel graded filter layer 332. Emergent plants are planted on the cover layer 331, and the root system of the emergent plants extends into the cover layer 331, the sand and gravel graded filter layer 332, and the gravel drainage layer 333.

[0056] The gravel drainage layer 333 is a layer made of gravel. A drainage pipe 322 is laid in the water collection ditch 321. The drainage pipe 322 is a pipe with several water-permeable holes on its surface. The drainage pipe 322 is inserted into the top of the adjacent unit pool 32. The gravel drainage layer 333 is inserted into the water collection ditch 321 and wraps around the drainage pipe 322.

[0057] The sand and gravel gradation filter layer 332 can be formed by any known sand and gravel gradation. In this embodiment, the sand and gravel gradation filter layer 332 adopts the following weight percentage gradation: 70% sand, 10% limestone aggregate, 10% polyferric sulfate, and 10% ferrous sulfate aggregate.

[0058] The capping layer 331 is a layer made of limestone.

[0059] The water collection area 4 includes a collection well 42 and an outlet well 43, both located underground. A drainage pipe 322, located in the lowest unit pool 32, is inserted into the collection well 42. A control room 425 is located on the outer wall of the collection well 42, through which the drainage pipe 322 passes. A control valve 426 is installed on the drainage pipe 322, located within the control room 425. A drainage pump 421 is located on the bottom wall of the collection well 42, with a drainage pipe 423 connected to its outlet end. A valve chamber 422 is located on the outer wall of the collection well 42, through which the drainage pump 421 passes. A drainage valve 424 is installed on the drainage pump 421, located within the valve chamber 422.

[0060] The end of the drainage pipe 423 away from the drainage pump 421 is inserted into the outlet well 43, and the outlet well 43 is provided with an outlet 41 that is connected to the river.

[0061] The implementation principle of a vertical subsurface flow system in this application embodiment is as follows: water on the ground flows into the pond 13 through ditches to form a water feature for tourists to view.

[0062] When drainage is needed, the top cover 122 is opened, and the water in the pond 13 enters the inlet well 11 through the opening 121, and then flows into the sedimentation tank 21 for sedimentation.

[0063] When the water quality above the sedimentation tank 21 meets the discharge standards, the top pump 251 is started, and the water above the sedimentation tank 21 is discharged into the river through the top pump pipe 252 and the drainage pipe.

[0064] When the water quality above the sedimentation tank 21 fails to meet the discharge standards, water from the pond 13 is continuously fed into the middle. The water at the top of the sedimentation tank 21 enters the sedimentation tank 22 for sedimentation. After sedimentation, the water quality at the top of the sedimentation tank 22 is tested, and the effluent pump 261 or the standby pump 263 is started. Depending on the water quality, the water at the top of the sedimentation tank 22 is fed into vertical subsurface flow filter units 31 at different heights. The worse the water quality, the higher the vertical subsurface flow filter unit 31 is.

[0065] When the water quality in the sedimentation tank 21 and sedimentation tank 22 is too poor, first operate the chemical delivery valve 562, the chemical storage device 561 and the chemical delivery pump 51 to input the chemical into the sedimentation tank 21 and sedimentation tank 22, and then carry out sedimentation and sedimentation. After the sedimentation and sedimentation are completed, start the effluent pump 261 or the standby pump 263.

[0066] After the water flows into the unit pool 32, it permeates downwards in sequence through the cover layer 331, the sand and gravel graded filter layer 332, and the gravel drainage layer 333. Emergent plants, microorganisms, the cover layer 331, the sand and gravel graded filter layer 332, and the gravel drainage layer 333 all adsorb impurities and particulate matter in the water. The filtered water gathers in the water collection ditch 321 and the diversion drainage pipe 322, and flows along the diversion drainage pipe 322 into the next unit pool 32 for adsorption and filtration again.

[0067] Open the control valve 426 and the drain valve 424. The water flows out from the lowest unit pool 32 and into the collection well 42. Start the drain pump 421. The drain pump 421 pumps the water in the collection well 42 into the outlet well. The water then flows into the river along the outlet 41.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vertical subsurface flow system, characterized in that: The system includes a water storage system (1), a sedimentation system (2), a filter tank (3), and a water collection area (4). The sedimentation system (2) includes a sedimentation tank (21), a sedimentation tank (22), an equipment room (23), and a pump room (24). The water storage system (1) is equipped with an inlet well (11) connected to the sedimentation tank (21). The equipment room (23) is equipped with a top water pumping assembly (25) for pumping water from the top of the sedimentation tank (21). The sedimentation tank (21) and the sedimentation tank (22) are connected. The pump room (24) is equipped with an outlet system (26) for pumping water from the top of the sedimentation tank (22). The outlet system (26) is connected to the filter tank (3). The filter tank (3) includes several vertical subsurface flow filter units (31) connected sequentially from high to low. The vertical subsurface flow filter units (31) are connected to the water collection area (4). The water collection area (4) is equipped with an outlet (41). The vertical subsurface flow filtration unit (31) includes a unit pool (32) and a packing layer (33). The packing layer (33) is located inside the unit pool (32). Emergent plants are planted on the packing layer (33). A water collection ditch (321) is provided at the bottom of the unit pool (32). The gravel drainage layer (333) is a layer made of gravel. A guide drainage pipe (322) is provided inside the water collection ditch (321). The surface of the guide drainage pipe (322) is provided with several water-permeable holes. The guide drainage pipe (322) is inserted into the top of the adjacent unit pool (32). The gravel drainage layer (333) is inserted into the water collection ditch (321). The gravel drainage layer (333) wraps around the guide drainage pipe (322). The water outlet system (26) is connected to the unit pool (32). The water outlet system (26) includes an outlet pump (261), an outlet pipe (262), a standby pump (263), a standby pipe (264), and a distribution pipe (265). The outlet pump (261), the standby pump (263), and the distribution pipe (265) are all located in the pump room (24). The outlet pipe (262) and the standby pipe (264) are both inserted into the sedimentation tank (22). The outlet pipe (262) is connected to the inlet end of the outlet pump (261). The standby pipe (264) is connected to the outlet pump (265). 264) is connected to the inlet of the standby pump (263). The outlet of the outlet pump (261) and the outlet of the standby pump (263) are both connected to the water distribution pipe (265). The water distribution pipe (265) is connected to the vertical submersible filter unit (31). It can input the water in the upper part of the sedimentation tank (22) into the vertical submersible filter unit (31) at different heights according to the water quality. The worse the water quality, the higher the height of the vertical submersible filter unit (31) into which it is input. The filler layer (33) includes a cover layer (331), a sand and gravel graded filter layer (332), and a crushed stone drainage layer (333) arranged sequentially from top to bottom. The sand and gravel graded filter layer (332) is a layer made of sand and gravel. The sand and gravel graded filter layer (332) adopts the following weight percentage gradation: 70% sand, 10% limestone aggregate, 10% polyferric sulfate, and 10% ferrous sulfate aggregate.

2. A vertical subsurface flow system according to claim 1, characterized in that: The cover layer (331) is a layer made of limestone.

3. A vertical subsurface flow system according to claim 1, characterized in that: The top water pump assembly (25) includes a top water pump (251), a top water pipe (252), and a discharge pipe (253). An installation platform (231) is fixedly connected to the inner wall of the equipment room (23). The top water pump (251) is installed on the installation platform (231). One end of the top water pipe (252) is inserted into the sedimentation tank (21), and the other end of the top water pipe (252) is connected to the inlet end of the top water pump (251). One end of the discharge pipe (253) is connected to the outlet end of the top water pump (251), and the other end of the discharge pipe (253) penetrates the side wall of the equipment room (23).

4. A vertical subsurface flow system according to claim 1, characterized in that: The vertical subsurface flow system also includes a dosing assembly (5), which includes a dosing pump (51), a main dosing pipe (52), branch dosing pipes (53), a water pipe (54), a flushing water pipe (55), and an interface pipe (56) for conveying the dosing agent. The dosing pump (51) is installed on the inner wall of the pump chamber (24). One end of the water pipe (54) is inserted into the sedimentation tank (22), and the other end of the water pipe (54) is connected to the inlet of the dosing pump (51). One end of the main dosing pipe (52) is connected to the outlet of the dosing pump (51), and several branch dosing pipes (53) are connected to the dosing agent. All are connected to the end of the main drug delivery pipe (52) away from the drug delivery pump (51). The drug delivery branch pipe (53) is inserted into the sedimentation tank (22) and the settling tank (21). The interface pipe (56) is connected to the main drug delivery pipe (52). A drug storage device (561) is installed at the end of the interface pipe (56) away from the main drug delivery pipe (52). A drug delivery valve (562) is installed on the interface pipe (56). The flushing water pipe (55) is installed on the outer wall of the settling tank (21). One end of the flushing water pipe (55) is inserted into the settling tank (21), and the other end of the flushing water pipe (55) is located outside the settling tank (21).

5. A vertical subsurface flow system according to claim 1, characterized in that: The water collection area (4) includes a water collection well (42) and an outlet well (43). The vertical submersible filter unit (31) is connected to the water collection well (42). A water collection pump (421) is installed in the water collection well (42). A valve chamber (422) is installed on the outer wall of the water collection well (42). The outlet end of the water collection pump (421) is connected to a water collection pipe (423). The water collection pipe (423) passes through the valve chamber (422). A water collection valve (424) is installed on the water collection pipe (423). The water collection valve (424) is located in the valve chamber (422). The water collection pipe (423) is inserted into the outlet well (43). The outlet (41) is located on the side wall of the outlet well (43).

6. A vertical subsurface flow system according to claim 1, characterized in that: The inlet well (11) is provided with an inlet cover (12) at the top. The inlet cover (12) is provided with an opening (121). The inlet cover (12) is provided with a top cover (122) for closing the opening (121). One side of the top cover (122) is rotatably connected to the inlet cover (12), and the other side of the top cover (122) is detachably connected to the inlet cover (12). A filter screen (123) is provided inside the inlet.

7. A vertical subsurface flow system according to claim 1, characterized in that: An overflow device (27) is provided between the sedimentation tank (21) and the settling tank (22). The overflow device (27) includes a through pipe (271) and an overflow pipe (272). One end of the through pipe (271) is inserted into the sedimentation tank (21), and the other end of the through pipe (271) is inserted into the settling tank (22). The overflow pipe (272) is arranged vertically in the sedimentation tank (21), and the through pipe (271) and the overflow pipe (272) are connected.

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