A geo-technical method for treating groundwater pollution in the upper reaches of a groundwater system

Abstract

The present invention discloses a method for geoscience control of groundwater pollution in the upstream of a groundwater system, which includes: S1, pollution investigation: investigating the groundwater flow direction at the pollution source, the position of the water-blocking bottom plate and the lateral boundary of the pollution plume; S2, curtain construction: constructing an interception curtain downstream of the groundwater flow; S3, pumping well construction: constructing a sewage pumping well between the pollution source and the interception curtain; S4, sewage pumping: pumping out the polluted groundwater in the pumping well through a pumping system for treatment. By constructing an interception curtain at a position where the groundwater flows downstream and close to the pollution source, the purpose of intercepting and sealing the polluted groundwater is achieved. As the amount of sealed polluted groundwater increases, the water level in the pumping well will continue to rise. By pumping out and treating the sewage stored in the pumping well to effectively reduce the pollutant concentration of the downstream pollution receptor, it can effectively reduce or even eliminate the problem of high and continuous water treatment investment at the end, and effectively reduce the burden of environmental governance.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater pollution control, and in particular to a geotechnical control method for groundwater pollution in the upstream of a groundwater system. Background Art

[0002] Karst areas have strong surface and underground karst development, and the geological environment is complex and fragile. Groundwater has poor anti-pollution ability, strong sensitivity, high vulnerability, and difficulty in supervision. Once polluted, groundwater is difficult to recover. It is difficult to investigate the cause of pollution, and end-of-pipe treatment requires permanent investment and extremely high operation and maintenance costs. Groundwater in karst areas is severely polluted by chemical parks, solid waste dumps, landfills, and coal mines, and there is an urgent need to explore and build an economical and efficient geoscience governance model.

[0003] At present, the treatment of groundwater pollution is mostly carried out through end-of-pipe treatment, that is, building sewage treatment facilities at the end of the pollution spring to carry out passive end-of-pipe treatment of water chemical treatment. Although the short-term treatment effect is good and the effect is quick, the dynamic causes of groundwater in karst areas are mostly meteorological and have large dynamic changes, and the treatment equipment needs to be operated permanently, making the cost of end-of-pipe treatment extremely high. Summary of the invention

[0004] The purpose of the present invention is to provide a method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system, which can solve the problem of high cost of end-of-pipe treatment.

[0005] To achieve the above-mentioned purpose, a method for geoscience treatment of groundwater pollution in the upstream of a groundwater system is provided, which comprises:

[0006] S1. Pollution investigation: Investigate the groundwater flow direction at the pollution source, the location of the water-blocking floor, and the lateral boundaries of the pollution plume;

[0007] S2. Curtain construction: construct an interception curtain downstream of the groundwater flow;

[0008] S3, drainage well construction: construct a drainage well between the pollution source and the interception curtain, the drainage well is located in the pollution plume;

[0009] S4. Sewage Pumping: The contaminated groundwater in the pumping well is pumped out through the pumping system for treatment.

[0010] According to the geotechnical treatment method for groundwater pollution in the upstream of a groundwater system, in S2, the interception curtains are arranged in two rows, the spacing between the two rows of interception curtains is 1.2-2.5m, and the two rows of interception curtains are arranged in an arc shape.

[0011] According to the geotechnical treatment method for groundwater pollution in the upstream of a groundwater system, in S2, the interception curtain extends downward to the waterproof bottom plate.

[0012] According to the geotechnical treatment method for groundwater pollution in the upstream of a groundwater system, in S3, a plurality of pumping wells are provided and arranged in sequence along the interception curtain.

[0013] According to the geotechnical treatment method for groundwater pollution in the upstream of a groundwater system, in S3, the pumping well penetrates the pollution plume downward.

[0014] According to the geotechnical treatment method for groundwater pollution upstream of a groundwater system, the pumping system comprises:

[0015] A carrier body is arranged at the wellhead of the pumping well;

[0016] A water pumping pipe is vertically arranged in the pumping well and connected to the carrier, and the water pumping pipe is connected to a water pump;

[0017] A ladder is vertically arranged on the inner wall of the pumping well;

[0018] The floating frame is located in the pumping well, sleeved on the pumping pipe, and slidably connected with the ladder;

[0019] A well washing device, movably arranged on the floating frame;

[0020] A driving device is arranged between the well-washing device and the floating frame, and is used to drive the well-washing device to rotate around the water pumping pipe;

[0021] A water supply assembly connected to the well washing device;

[0022] The working steps of the pumping system are:

[0023] A1. Arrange the floating frame and well-washing device in the pumping well, and connect the well-washing device to the water supply assembly;

[0024] A2. The water in the drainage well is pumped out by a water pump, and the floating frame reaches the bottom of the drainage well as the water level drops;

[0025] A3. The driving device drives the well-washing device to rotate around the pumping pipe, and the water supply assembly supplies water to the well-washing device. The well-washing device flushes the well wall of the pumping well, and groundwater seeps into the pumping well to store water. The water level in the pumping well rises to drive the floating frame to float up;

[0026] A4. After the groundwater level stabilizes, the water in the pumping well is pumped out by the water pump, the driving device continues to drive the well washing device to rotate around the pumping pipe, the water supply component continues to supply water to the well washing device, and the well washing device continues to flush the well wall of the pumping well.

[0027] According to the geotechnical treatment method for groundwater pollution upstream of a groundwater system, the ladder comprises two vertical rods arranged in parallel, and the floating frame comprises:

[0028] Two semicircular floating seats are arranged opposite to each other, the two semicircular floating seats are connected by bolts to form a ring sleeved on the water pumping pipe, and a first guide wheel is arranged on the inner side of the semicircular floating seat;

[0029] Two semicircular racks are arranged opposite to each other, and each of the two semicircular racks is arranged on a semicircular floating seat to form a first gear ring;

[0030] The guide float seat has guide rod racks inserted on both sides, and second guide wheels are arranged on opposite sides of the two guide rod racks, and the second guide wheels are attached to the vertical rods;

[0031] The connecting frame is respectively connected with the semicircular floating seat and the guide floating seat through bolts.

[0032] According to the geotechnical treatment method for groundwater pollution upstream of a groundwater system, the driving device includes a first motor, and the well washing device includes a first mounting seat, a guide rail, a spur rack, a second mounting seat, a second motor, a second gear ring, a third motor and a nozzle seat;

[0033] The first mounting seat can float on the water surface and is slidably connected to the outer side of the semicircular floating seat. The first motor is arranged on the first mounting seat and is equipped with a first gear meshing with the semicircular rack. The guide rail and the spur rack are arranged in parallel on the first mounting seat. The second mounting seat is slidably arranged on the guide rail. The second motor is arranged on the second mounting seat and is equipped with a second gear meshing with the spur rack. The second gear ring is rotatably mounted on the second mounting seat, and the first mounting seat is located inside the second gear ring. The third motor is arranged on the second mounting seat and is equipped with a third gear meshing with the second gear ring. The nozzle seat is connected to the second gear ring and has an inclined mounting surface, and a nozzle is arranged on the mounting surface.

[0034] The working steps of the pumping system also include:

[0035] A5. When the floating frame moves down to 2-3m from the bottom of the pumping well, the third motor drives the second gear ring to rotate so that the nozzle seat moves to the bottom of the second mounting seat, and the second motor drives the second mounting seat to reciprocate along the guide rail, and the driving device continues to drive the well washing device to rotate around the pumping pipe.

[0036] Beneficial effects: By constructing an interception curtain where the groundwater flows downstream and close to the pollution source, the purpose of intercepting and sealing the polluted groundwater is achieved. As the amount of sealed polluted groundwater increases, the water level in the pumping well will continue to rise. By pumping out the sewage stored in the pumping well for treatment, the pollutant concentration of the downstream pollution receptors can be effectively reduced. It can effectively reduce or even eliminate the problem of high and continuous water treatment investment at the end, and effectively reduce the burden of environmental governance.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0039] Figure 1 A flowchart of a governance method according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the arrangement of the interception curtain and the extraction well;

[0041] Figure 3 This is a schematic diagram of the arrangement of the interception curtain and the drainage well from another perspective;

[0042] Figure 4 It is a structural diagram of the pumping well;

[0043] Figure 5 It is a top view of the floating frame and the well-washing device;

[0044] Figure 6 This is the front view of the connecting frame and the floating seat;

[0045] Figure 7 This is the front view of the nozzle seat. DETAILED DESCRIPTION

[0046] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0049] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0050] Reference Figures 1 to 3 , a method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system, comprising the following steps:

[0051] S1. Pollution investigation: Investigate the groundwater flow direction at the pollution source, the location of the water-blocking floor, and the lateral boundaries of the pollution plume;

[0052] S2. Curtain construction: construct an interception curtain downstream of the groundwater flow;

[0053] S3. Pumping well construction: A pumping well is constructed between the pollution source and the interception curtain, and the pumping well is located in the pollution plume;

[0054] S4. Sewage Pumping: The contaminated groundwater in the pumping well is pumped out through the pumping system for treatment.

[0055] Among them, the position of the waterproof bottom plate, that is, the bottom layer of the aquifer in the groundwater flow path, the groundwater at the pollution source will not flow below the waterproof bottom plate. In S2, the interception curtains are arranged in two rows, and the spacing between the two rows of interception curtains is 1.2-2.5m. The two rows of interception curtains are arranged in an arc shape, and the interception curtains extend downward to the waterproof bottom plate. In S3, the pumping well 11 is set to be multiple and arranged in sequence along the interception curtains, and the pumping well 11 penetrates the pollution plume downward, and the bottom surface of the pumping well 11 is higher than the waterproof bottom plate.

[0056] As in the above scheme, by constructing an interception curtain at a location where groundwater flows downstream and close to the pollution source, the purpose of intercepting and sealing the polluted groundwater is achieved. As the amount of sealed polluted groundwater increases, the water level in the pumping well 11 will continue to rise. By pumping out and treating the sewage stored in the pumping well 11, the pollutant concentration of the downstream pollution receptors can be effectively reduced. In general, by adopting the "near-source interception and drainage" geoscience governance model for the pollution sources that cause system groundwater pollution in the upstream part of the groundwater system, near-source pumping and treatment of the polluted groundwater can be carried out to reduce the pollutant emission concentration of the downstream pollution receptors, which can effectively reduce or even eliminate the problem of high and continuous water treatment investment at the end, and effectively reduce the burden of environmental governance.

[0057] The distance between the construction location of the interception curtain and the pollution source is generally no more than 1km. If the geological conditions for constructing the interception curtain within 1km are poor, the distance between the construction location of the interception curtain and the pollution source can be set within 2km. When constructing the interception curtain, first drill a hole, and then pour cement slurry into the hole. The top elevation of the cement slurry pouring is at least 5m higher than the highest historical groundwater level at the construction location of the interception curtain.

[0058] The pumping well 11 needs to store water continuously. After a period of use, a mud layer will form on the inner wall, which will affect the infiltration of sewage. Therefore, it is necessary to flush the pumping well 11. For this purpose, the following pumping system is also proposed. Figures 4 to 7 The pumping system includes a carrier 12, a pumping pipe 13, a ladder 20, a floating frame 30, a well washing device 40, a driving device and a water supply assembly 70. The carrier 12 is arranged at the wellhead of the pumping well 11. The pumping pipe 13 is vertically arranged in the pumping well 11. The pumping pipe 13 is connected to the carrier 12, and the pumping pipe 13 is connected to a pumping pump 131. The ladder 20 is vertically arranged on the inner wall of the pumping well 11. The floating frame 30 is located in the pumping well 11 and is sleeved on the pumping pipe 13. The floating frame 30 is slidably connected to the ladder 20. The well washing device 40 is movably arranged on the floating frame 30. The driving device is arranged between the well washing device 40 and the floating frame 30. The driving device is used to drive the well washing device 40 to rotate around the pumping pipe 13. The water supply assembly 70 is connected to the well washing device 40.

[0059] Specifically, the ladder 20 includes two parallel vertical rods 21, the floating frame 30 includes a semicircular floating seat 31, a semicircular rack 32, a floating guide seat 33 and a connecting frame 34, the semicircular floating seat 31 is provided in two and arranged oppositely, the two semicircular floating seats 31 are connected by bolts to form a ring sleeved on the pumping pipe 13, and the inner side of the semicircular floating seat 31 is provided with a first guide wheel 311, the semicircular rack 32 is provided in two and arranged oppositely, the two semicircular racks 32 are respectively provided on a semicircular floating seat 31 to form a first gear ring, the two sides of the floating guide seat 33 are provided with a guide rod frame 35, the opposite sides of the two guide rod frames 35 are provided with a second guide wheel 36, the second guide wheel 36 is attached to the vertical rod 21, and the connecting frame 34 is respectively connected to the semicircular floating seat 31 and the floating guide seat 33 by bolts. The floating guide seat 33 is provided with a fastening bolt, and the end of the fastening bolt stops against the guide rod frame 35 to limit its sliding.

[0060] During assembly, the semicircular floating seat 31 is formed into a ring, the semicircular rack 32 is formed into a first gear ring, the guide rod frame 35 is slid along the guide floating seat 33 to adjust the position and then locked, the first guide wheel 311 stops against the pumping pipe 13, and the second guide wheel 36 stops against the vertical rod 21; the connecting frame 34 is respectively connected to the semicircular floating seat 31 and the guide floating seat 33 by bolts. This structure can carry the well washing device 40 and ensure that it floats on the water surface, and the up and down movement of the floating frame 30 can be limited by the pumping pipe 13 and the ladder 20 to prevent it from lateral movement and rotation, and there is no need to set up additional guide rods and other structures to guide the floating frame 30.

[0061] The driving device includes a first motor 51 , and the well washing device 40 includes a first mounting seat 41 , a guide rail 42 , a spur rack 43 , a second mounting seat 44 , a second motor 45 , a second gear ring 46 , a third motor 47 and a nozzle seat 48 . The first mounting seat 41 can float on the water surface by relying on the buoyancy of its own water, and the first mounting seat 41 is slidably connected to the outer side of the semicircular floating seat 31. The first motor 51 is arranged on the first mounting seat 41 and is installed with a first gear meshing with the semicircular rack 32. The guide rail 42 and the spur rack 43 are arranged in parallel on the first mounting seat 41. The second mounting seat 44 is slidably arranged on the guide rail 42. The second motor 45 is arranged on the second mounting seat 44 and is installed with a second gear meshing with the spur rack 43. The second ring gear 46 is rotatably mounted on the second mounting seat 44, and the first mounting seat 41 is also located on the inner side of the second ring gear 46. The third motor 47 is arranged on the second mounting seat 44 and is installed with a third gear meshing with the second ring gear 46. The nozzle seat 48 is connected to the second ring gear 46. The nozzle seat 48 has an inclined mounting surface 481, and a nozzle 49 is arranged on the mounting surface 481. The mounting surface 481 is inclined to the horizontal plane so that the nozzle 49 can spray out the well washing liquid (the well washing liquid can be clean water) obliquely. The water supply assembly 70 includes a water supply pump 71 and a water supply pipe 72, and the water supply pipe 72 is connected to the water supply pump 71 and the nozzle respectively.

[0062] The working steps of the pumping system are:

[0063] A1. Arrange the floating frame 30 and the well-washing device 40 in the pumping well 11, and connect the well-washing device 40 to the water supply assembly 70;

[0064] A2. The water in the pumping well 11 is pumped out by the pump 131. The floating frame 30 reaches the bottom of the pumping well 11 as the water level drops.

[0065] A3. The driving device drives the well-washing device 40 to rotate around the pumping pipe 13, and the water supply assembly 70 supplies water to the well-washing device 40. The well-washing device 40 flushes the well wall of the pumping well 11, and the groundwater re-infiltrates into the pumping well 11 to store water. The water level in the pumping well 11 rises to drive the floating frame 30 to float up;

[0066] A4. After the groundwater level is stable, the water in the pumping well 11 is pumped out by the pumping pump 131, the driving device continues to drive the well washing device 40 to rotate around the pumping pipe 13, the water supply assembly 70 continues to supply water to the well washing device 40, the well washing device 40 continues to wash the well wall of the pumping well 11, and the floating frame 30 gradually moves downward;

[0067] A5. When the floating frame 30 moves down to 2-3m away from the bottom surface of the pumping well 11, the third motor 47 drives the second gear ring 46 to rotate so that the nozzle seat 48 moves to the bottom of the second mounting seat 44, and the second motor 45 drives the second mounting seat 44 to reciprocate along the guide rail 42. The driving device continues to drive the well washing device 40 to rotate around the water pumping pipe 13.

[0068] In step A3, the nozzle seat 48 is first located below the first mounting seat 41, so that the nozzle 49 sprays the well-washing fluid obliquely downward to wash the side wall bottom of the pumping well 11; after the well-washing device 40 rotates 2-3 times around the water pumping pipe 13, the third motor 47 drives the nozzle seat 48 to move to the top of the second mounting seat 44. In the time required for the third motor 47 to drive the nozzle seat 48 to move to the top of the second mounting seat 44, the well-washing device 40 rotates 1-2 times around the water pumping pipe 13. In the time required for the well-washing device 40 to rotate 1 or 2 times around the water pumping pipe 13 in the forward direction, the well-washing device 40 rotates the same number of times in the reverse direction to prevent the water supply pipe 72 from being damaged due to excessive twisting.

[0069] In step A5, water can be distributed to the bottom of the drainage well 11 to lift the sediment deposited at the bottom of the drainage well 11, and the sewage containing sediment can be pumped out by the pumping pump 131 to reduce the sediment deposition in the drainage well 11. When there is a lot of sediment in the drainage well 11, steps A2-A5 can be repeated.

[0070] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system, characterized in that: include: S1. Pollution investigation: Investigate the groundwater flow direction at the pollution source, the location of the water-blocking floor, and the lateral boundaries of the pollution plume; S2. Curtain construction: construct an interception curtain downstream of the groundwater flow; S3, drainage well construction: construct a drainage well between the pollution source and the interception curtain, the drainage well is located in the pollution plume; S4. Sewage Pumping: The contaminated groundwater in the pumping well is pumped out through the pumping system for treatment; The pumping system comprises: A carrier body is arranged at the wellhead of the pumping well; A water pumping pipe is vertically arranged in the pumping well and connected to the carrier, and the water pumping pipe is connected to a water pump; A ladder is vertically arranged on the inner wall of the pumping well; The floating frame is located in the pumping well, sleeved on the pumping pipe, and slidably connected with the ladder; A well washing device, movably arranged on the floating frame; A driving device is arranged between the well-washing device and the floating frame, and is used to drive the well-washing device to rotate around the water pumping pipe; A water supply assembly connected to the well washing device; The working steps of the pumping system are: A1. Arrange the floating frame and well-washing device in the pumping well, and connect the well-washing device to the water supply assembly; A2. The water in the drainage well is pumped out by a water pump, and the floating frame reaches the bottom of the drainage well as the water level drops; A3. The driving device drives the well-washing device to rotate around the pumping pipe, and the water supply assembly supplies water to the well-washing device. The well-washing device flushes the well wall of the pumping well, and groundwater seeps into the pumping well to store water. The water level in the pumping well rises to drive the floating frame to float up; A4. After the groundwater level stabilizes, the water in the pumping well is pumped out by the water pump, the driving device continues to drive the well washing device to rotate around the pumping pipe, the water supply component continues to supply water to the well washing device, and the well washing device continues to wash the well wall of the pumping well; The ladder comprises two vertical rods arranged in parallel, and the floating frame comprises: Two semicircular floating seats are arranged opposite to each other, the two semicircular floating seats are connected by bolts to form a ring sleeved on the water pumping pipe, and a first guide wheel is arranged on the inner side of the semicircular floating seat; Two semicircular racks are arranged opposite to each other, and each of the two semicircular racks is arranged on a semicircular floating seat to form a first gear ring; The guide float seat has guide rod racks inserted on both sides, and second guide wheels are arranged on opposite sides of the two guide rod racks, and the second guide wheels are attached to the vertical rods; The connecting frame is respectively connected with the semicircular floating seat and the guide floating seat through bolts.

2. The method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system according to claim 1, characterized in that: In S2, the interception curtains are arranged in two rows, and both rows of interception curtains are arranged in an arc shape.

3. The method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system according to claim 1, characterized in that: In S2, the interception curtain extends downward to the watertight bottom plate.

4. The method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system according to claim 1, characterized in that: In S3, a plurality of pumping wells are provided and arranged in sequence along the interception curtain.

5. The method for geotechnical treatment of groundwater pollution in the upstream of a groundwater system according to claim 1, characterized in that: The driving device includes a first motor, and the well washing device includes a first mounting seat, a guide rail, a spur rack, a second mounting seat, a second motor, a second gear ring, a third motor and a nozzle seat; The first mounting seat can float on the water surface and is slidably connected to the outer side of the semicircular floating seat. The first motor is arranged on the first mounting seat and is equipped with a first gear meshing with the semicircular rack. The guide rail and the spur rack are arranged in parallel on the first mounting seat. The second mounting seat is slidably arranged on the guide rail. The second motor is arranged on the second mounting seat and is equipped with a second gear meshing with the spur rack. The second gear ring can be rotatably mounted on the second mounting seat, and the first mounting seat is located inside the second gear ring. The third motor is arranged on the second mounting seat and is equipped with a third gear meshing with the second gear ring. The nozzle seat is connected to the second gear ring and has an inclined mounting surface, and a nozzle is arranged on the mounting surface. The working steps of the pumping system also include: A5. When the floating frame moves down to 2-3m from the bottom of the pumping well, the third motor drives the second gear ring to rotate so that the nozzle seat moves to the bottom of the second mounting seat, and the second motor drives the second mounting seat to reciprocate along the guide rail, and the driving device continues to drive the well washing device to rotate around the pumping pipe.

Images