CN113235710A - Efficient underground water remediation system and method - Google Patents
Efficient underground water remediation system and method Download PDFInfo
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- CN113235710A CN113235710A CN202110676288.4A CN202110676288A CN113235710A CN 113235710 A CN113235710 A CN 113235710A CN 202110676288 A CN202110676288 A CN 202110676288A CN 113235710 A CN113235710 A CN 113235710A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 238000005067 remediation Methods 0.000 title claims abstract description 20
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- 239000010865 sewage Substances 0.000 claims abstract description 36
- 238000003911 water pollution Methods 0.000 claims abstract description 20
- 238000000746 purification Methods 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 239000003673 groundwater Substances 0.000 claims description 25
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- 230000008439 repair process Effects 0.000 description 9
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
- E03F1/002—Methods, systems, or installations for draining-off sewage or storm water with disposal into the ground, e.g. via dry wells
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
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Abstract
The invention provides a high-efficiency underground water remediation system, which comprises: the intercepting ditch is arranged at the downstream of the underground water pollution area and is used for intercepting underground water in the underground water pollution area; the water collecting well is arranged in the intercepting ditch and is used for collecting the underground water intercepted by the intercepting ditch; the sewage treatment system is used for treating the underground water in the water collecting well; the water purification tower comprises a vertically arranged third pipeline, the lower end of the third pipeline is buried underground and arranged at the upstream of the underground water pollution area, and underground water treated by the sewage treatment system returns to the underground through the water purification tower. The system can realize efficient restoration of underground water in the underground water polluted area.
Description
Technical Field
The invention relates to the technical field of groundwater pollution remediation, in particular to a high-efficiency groundwater remediation system and method.
Background
Groundwater is one of the important water resources in China, and drinking water in more than 400 cities comes from groundwater. In recent years, with the aggravation of industrial production activities, the excessive use of pesticides and fertilizers, aging leakage of chemical production and storage facilities and other reasons, the situation of groundwater pollution in China is severe.
The underground water interception ditch is an underground engineering for quickly collecting polluted underground water, can obviously improve the collection rate of the polluted underground water in a low-permeability stratum during operation, effectively intercepts migration of pollution plumes of the underground water, and is a simple and practical polluted underground water risk management and control and repair technology. The underground water interception ditch technology is mature in the aspects of principle, design, construction, operation and the like, a large number of engineering practices are carried out abroad, but the application of the engineering in China is less, and related researches are deficient.
At present, a technical scheme for treating groundwater pollution through a groundwater interception ditch is provided, for example, an interception device for controlling groundwater pollution disclosed in chinese patent invention 202010548043. The intercepting device is provided with a strip-shaped underground ditch body; a longitudinal water and gas collecting well is arranged at the tail end of one side of the ditch body and is vertical to the ditch body; a high permeable layer is arranged in the ditch body, a sealing layer is arranged at the top of the high permeable layer, a water collecting pipe extending along the length direction of the ditch body is arranged in the middle of the lower part of the high permeable layer close to the bottom of the ditch, and one end of the water collecting pipe is communicated with the water and gas collecting well; and a gas collecting pipe extending along the length direction of the ditch body is arranged in the middle of the upper part of the high-permeability layer close to the sealing layer above the water collecting pipe, and one end of the gas collecting pipe is communicated with the water collecting and gas collecting well. The intercepting device for controlling the pollution of the underground water can quickly and effectively intercept the migration of the pollution plume of the underground water and synchronously repair the pollution of the soil and the underground water in the target area at the upstream of the intercepting device.
However, the permeation speed of the underground water is extremely low, the restoration of the underground water by using an interception ditch technology is a long-term project, a typical case is that a Laiyong army training base is located in the army of the American navy in Onslo county, N.C., a set of interception ditch extraction systems is respectively installed at the downstream of two underground water pollution plumes on site, after 2.5 years of operation, the concentration of pollutants in the underground water is gradually reduced while the two sets of interception ditch systems effectively intercept the diffusion of the underground water pollution plumes to the periphery, and the average concentration of benzene series extracted from the underground water in the later operation stage is close to that of the benzene series which is not detected.
However, the treatment time of 2.5 years is too long, which causes extremely high treatment cost of groundwater pollution, and therefore, how to accelerate the treatment speed of the catch basin extraction system on groundwater pollution is a problem to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides an efficient underground water remediation system which can intercept and treat polluted underground water and send the treated underground water back to the ground.
In order to achieve the purpose, the invention provides the following technical scheme:
an efficient groundwater remediation system, comprising:
the intercepting ditch is arranged at the downstream of the underground water pollution area and is used for intercepting underground water in the underground water pollution area;
the water collecting well is arranged in the intercepting ditch and is used for collecting the underground water intercepted by the intercepting ditch;
the sewage treatment system is used for treating the underground water in the water collecting well;
the water purification tower comprises a vertically arranged third pipeline, the lower end of the third pipeline is buried underground and arranged at the upstream of the underground water pollution area, and underground water treated by the sewage treatment system returns to the underground through the water purification tower.
Preferably, be provided with first permeable layer and the first infiltration pipe of setting in first permeable layer in the interception ditch, first permeable layer is the underground inverted filter who is formed by high permeability filler material, and first infiltration pipe is the screen pipe, is provided with a plurality of sieve meshes on its pipe wall uniformly, and groundwater can enter into through first permeable layer in the first permeable pipe, first permeable pipe slope sets up, the sump pit set up in the interception ditch and with the lower one end intercommunication of first permeable pipe.
Preferably, the lower end of the water collecting well is lower than the lower end of the first seepage pipe.
Preferably, the cross section of the intercepting ditch is rectangular, the bottom of the intercepting ditch is lower than the underground water line, the length of the intercepting ditch is 1.1-1.2 times of the width of the underground water pollution plume, the width of the intercepting ditch is 0.3-1.0m, and the depth of the bottom of the intercepting ditch is more than 1m greater than the depth of the underground water pollution plume.
Preferably, the first water-permeable layer is filled on top with a low-permeability material or sealing material.
Preferably, the water collecting well is connected with the sewage treatment system through a first pipeline, a sewage pump is arranged on the first pipeline, and the sewage pump is used for conveying the underground water in the water collecting well to the sewage treatment system through the first pipeline.
Preferably, the water collecting well is of a reinforced concrete anti-seepage structure, a liquid level switch is arranged in the water collecting well and connected with the control system, and the control system detects the liquid level in the water collecting well through the liquid level switch and controls the opening and closing of the sewage pump according to the liquid level.
Preferably, a second water-permeable layer is arranged around the lower end of the third pipeline, the second water-permeable layer is formed by high-permeability filling materials, and a low-permeability material or a sealing material is adopted at the top of the second water-permeable layer.
The invention also provides an efficient groundwater remediation method, which adopts the remediation system and specifically comprises the following steps:
the method comprises the following steps: arranging the interception ditch, a first water seepage layer, a first water seepage pipe, a water collecting well, a water purification tower and a second water seepage layer at proper positions;
step two: the interception ditch intercepts the underground water flowing through the interception ditch;
step three: the underground water intercepted by the intercepting ditch enters the first seepage pipe through the first seepage layer;
step four: the underground water in the first seepage pipe enters the water collecting well along the first seepage pipe;
step five: when the liquid level of the underground water in the water collecting well reaches a certain height, the sewage pump starts to work to pump the underground water in the water collecting well into the sewage treatment system;
step six: the underground water treated by the sewage treatment system is conveyed to a water purification tower;
step seven: the water in the water purification tower enters the second water seepage layer under the action of gravity.
Compared with the prior art, the invention has the following beneficial effects:
1) the polluted underground water can be guided to enter a water collecting well by adopting the matching of the interception ditch, the water seepage layer and the water seepage pipe and is sent to a sewage treatment system by a sewage pump for treatment;
2) the invention adopts the water purification tower, the groundwater treated by the sewage treatment system is sent into the water purification tower, and the water purification tower has a certain height, so that the water in the water purification tower has higher pressure, and the treated groundwater is beneficial to entering the ground.
Drawings
FIG. 1 is a schematic diagram of a repair system of the present invention;
FIG. 2 is a perspective view of a repair system provided by the present invention;
FIG. 3 is a cross-sectional view of an intercepting trench of the repair system provided by the present invention;
FIG. 4 is a block diagram of the collector and collector wells of the rehabilitation system provided by the present invention;
FIG. 5 is a top view of a repair system provided by the present invention;
FIG. 6 is a cross-sectional view at section A-A of FIG. 5;
fig. 7 is a sectional view at the section B-B of fig. 5.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
As shown in fig. 1 to 7, an efficient groundwater remediation system includes an intercepting ditch 1, a water collecting well 2 disposed in the intercepting ditch 1, a sewage treatment system 5 for treating water collected in the water collecting well 2, and a water purifying tower 4. The intercepting drain 1 is disposed downstream of the groundwater pollution area and is used for intercepting groundwater. The water collecting well 2 is vertically arranged and used for collecting underground water in the intercepting ditch 1. The water purification tower 4 is used for receiving the underground water treated by the sewage treatment system 5 and sending the treated underground water to the underground again, and the water purification tower 4 is arranged at the upstream of the underground water pollution area. The sewage treatment system 5 adopts the prior art.
A first water seepage layer 1a and a first water seepage pipe 1b arranged in the first water seepage layer 1a are arranged in the interception ditch 1. The first permeable layer 1a is an underground inverted filter layer formed by high-permeability filling materials such as quartz sand, the first permeable pipe 1b is a sieve pipe, a plurality of sieve holes are uniformly arranged on the pipe wall of the sieve pipe, and underground water can enter the first permeable pipe 1b through the first permeable layer 1 a. The sump 2 is arranged in the intercepting ditch 1 and is communicated with the lower end of the first water seepage pipe 1b, and preferably, the sump 2 is vertically arranged. Groundwater enters into first infiltration pipe 1b through interception ditch 1, and the normal water of first infiltration pipe 1b enters into sump pit 2 along first infiltration pipe 1 b. In order to facilitate the entry of water of the first permeate pipe 1b into the water collection well 2, the lower end of the water collection well 2 may be arranged lower than the lower end of said first permeate pipe 1 b. Preferably, the intercepting ditches 1 can be provided in plurality, the first water seepage pipes 1b and the water collecting wells 2 can also be provided in plurality, and the intercepting ditches are reasonably arranged in a straight line, a broken line or a rectangular mode according to the distribution condition of underground water flow and pollution plumes.
The length direction of the intercepting trench 1 should be perpendicular to the flow direction of the groundwater as much as possible so as to intercept the groundwater as much as possible. The section of the interception ditch 1 is rectangular, the bottom of the interception ditch 1 is positioned at a certain distance below an underground water line, the length of the interception ditch 1 is 1.1-1.2 times of the width of the underground water pollution plume, and the width of the interception ditch is 0.3-1.0 m. The depth of the bottom of the interception ditch 1 is more than 1m greater than the depth of the underground water pollution plume, or the interception ditch directly reaches the position of a top plate of a water-resisting layer covering the aquifer.
The first water seepage pipe 1b is a sieve pipe with the diameter of 100-300 mm, and the first water seepage pipe 1b is a slotted sieve pipe or a perforated pipe, and is externally coated with a gauze or a steel wire mesh. The center of the first water seepage pipe 1b is positioned on the central line of the intercepting ditch 1 in the width direction. The first seepage pipe 1b is obliquely laid towards the inner direction of the water collecting well 2 with a certain slope, and the slope is greater than or equal to 0.5%.
In addition, a low-permeability material and a sealing material, such as cement, can be filled on the top of the first water seepage layer 1a, so that the underground sewage is prevented from seeping out of the ground and polluting the ground.
The water collecting well 2 is of a reinforced concrete anti-seepage structure, a liquid level switch can be further arranged inside the water collecting well 2 and is connected with a control system, the control system detects the liquid level in the water collecting well 2 through the liquid level switch and controls the opening and closing of the sewage pump 3 according to the liquid level, polluted underground water collected in the water collecting well 2 is discharged and sent into the sewage treatment system 5 in time, the liquid level in the well is ensured to be lower than the top of the water collecting well 2, therefore, the liquid level in the first seepage layer 1a is obviously lower than the surrounding underground water level, an effective hydraulic gradient is formed, polluted underground water in an upstream target area is enabled to flow into a ditch, and the collection of the polluted underground water and the interception of pollution feathers are realized.
The repair system is still including setting up the well lid at the upper end opening part of sump pit 2, the well lid be used for with the upper end opening of sump pit 2 is sealed. The repair system further comprises a vacuum pump, the air inlet end of which is communicated with the inside of the water collecting well 2 and is used for timely exhausting the waste gas in the water collecting well 2, so that the area in and around the water collecting well 2 has a lower air pressure, and groundwater can enter the water collecting well 2 as far as possible. The repair system may further include an exhaust gas treatment system for treating the exhaust gas drawn by the vacuum pump.
In operation, the sewage pump 3 and the vacuum pump may be operated simultaneously or independently. In the initial stage of operation, under the state of high pollution load of underground water, the mode of simultaneously operating the sewage pump 3 and the vacuum pump can greatly improve the interception and remediation effects on underground water pollution plumes, effectively prevent high-concentration underground water pollutants from migrating towards the downstream direction and quickly reduce the pollution load of upstream underground water. After the pollution load of the upstream underground water is greatly reduced in the later operation stage, the operation mode that the sewage pump 3 works and the vacuum pump does not work is adopted, so that the operation cost can be reduced while the polluted underground water is continuously and effectively intercepted. In addition, in some special occasions where only volatile pollutants in soil need to be controlled, the risk of the volatile pollutants invading the earth surface caused by groundwater pollution can be effectively reduced by adopting the operation modes that the sewage pump 3 does not work and the vacuum pump works.
The water purification tower 4 comprises a vertically arranged third pipeline 4a, the third pipeline 4a is arranged on the upper portion of underground water, the lower end of the third pipeline 4a is buried underground, a water storage tank 4c is arranged at the upper end of the third pipeline 4a, and the water outlet end of the sewage treatment system 5 is connected with the water storage tank 4c and used for injecting water into the water storage tank 4 c. And a valve is arranged at the joint of the water storage tank 4c and the third pipeline 4 a. The third pipe 4a has a certain height so that a certain pressure is generated when water enters the ground, so that the water can smoothly enter the ground.
Preferably, a second water-permeable layer 4d is provided around the lower end of the third pipe 4a, the second water-permeable layer 4d is formed of a high-permeability packing material such as quartz sand, and the water enters the second water-permeable layer 4d after coming out of the third pipe 4a, and the second water-permeable layer 4d has a large area, which facilitates the water to penetrate into the ground more quickly.
Low permeability material and sealing material are used on top of the second water-permeable layer 4d to avoid or reduce water seepage out of the ground to get as much water into the subterranean zone as possible.
The intercepting ditch 1 surrounds the underground water pollution area to form a rectangle, the water collecting wells 2 are arranged at four corners of the intercepting ditch 1, and the water purifying tower 4 is arranged in the center of the rectangle formed by the intercepting ditch 1.
Specifically, an annular surrounding ring is formed on the underground sewage through the rectangular intercepting ditch 1, the underground sewage can be intercepted from all directions, and the water purifying tower 4 is arranged in the center of the rectangle formed by the intercepting ditch 1, so that the sewage is forced to flow to the intercepting ditch 1 from the center of the intercepting ditch 1 by the water pressure of the water purifying tower.
Preferably, in practical operation, the intercepting trench 1 may also be disposed at a narrow position of the groundwater flow path, so that the amount of work can be reduced and a better intercepting effect can be achieved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An efficient groundwater remediation system, comprising:
the intercepting ditch is arranged at the downstream of the underground water pollution area and is used for intercepting underground water in the underground water pollution area;
the water collecting well is arranged in the intercepting ditch and is used for collecting the underground water intercepted by the intercepting ditch;
the sewage treatment system is used for treating the underground water in the water collecting well;
the water purification tower comprises a vertically arranged third pipeline, the lower end of the third pipeline is buried underground and arranged at the upstream of the underground water pollution area, and underground water treated by the sewage treatment system returns to the underground through the water purification tower.
2. A high efficiency groundwater remediation system as claimed in claim 1 wherein a first permeable layer and a first permeable pipe arranged in the first permeable layer are arranged in the intercepting trench, the first permeable layer is an underground inverted filter layer formed by a high permeability filler material, the first permeable pipe is a sieve pipe, a plurality of sieve holes are uniformly arranged on the pipe wall of the first permeable pipe, groundwater can enter the first permeable pipe through the first permeable layer, the first permeable pipe is arranged obliquely, and the sump is arranged in the intercepting trench and is communicated with the lower end of the first permeable pipe.
3. A high efficiency groundwater remediation system as claimed in claim 2 wherein the lower end of the sump well is below the lower end of the first penstock.
4. A high-efficiency underground water remediation system as claimed in claim 3, wherein the cross section of the interception ditch is rectangular, the bottom of the interception ditch is lower than the underground water line, the length of the interception ditch is 1.1-1.2 times of the width of the underground water pollution plume, the width of the interception ditch is 0.3-1.0m, and the depth of the bottom of the interception ditch is more than 1m greater than the depth of the underground water pollution plume.
5. A high efficiency groundwater remediation system as claimed in claim 2 wherein the first permeable layer is topped with a low permeability or sealing material.
6. A high efficiency groundwater remediation system as claimed in claim 1 wherein the sump is connected to the wastewater treatment system via a first pipe, and a sewage pump is provided in the first pipe for pumping groundwater from the sump to the wastewater treatment system via the first pipe.
7. A high-efficiency underground water remediation system as claimed in claim 6 wherein the sump is of a reinforced concrete impermeable structure, and a liquid level switch is arranged inside the sump and is connected to the control system, and the control system detects the liquid level inside the sump through the liquid level switch and controls the on/off of the sewage pump according to the liquid level.
8. A high efficiency groundwater remediation system as claimed in claim 7 wherein a second permeable layer is provided around the lower end of the third pipe, the second permeable layer being formed of a high permeability packing material, a low permeability material or sealing material being applied to the top of the second permeable layer.
9. The efficient groundwater remediation method comprises the following steps of:
the method comprises the following steps: arranging the interception ditch, a first water seepage layer, a first water seepage pipe, a water collecting well, a water purification tower and a second water seepage layer at proper positions;
step two: the interception ditch intercepts the underground water flowing through the interception ditch;
step three: the underground water intercepted by the intercepting ditch enters the first seepage pipe through the first seepage layer;
step four: the underground water in the first seepage pipe enters the water collecting well along the first seepage pipe;
step five: when the liquid level of the underground water in the water collecting well reaches a certain height, the sewage pump starts to work to pump the underground water in the water collecting well into the sewage treatment system;
step six: the underground water treated by the sewage treatment system is conveyed to a water purification tower;
step seven: the water in the water purification tower enters the second water seepage layer under the action of gravity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833522A (en) * | 2021-08-20 | 2021-12-24 | 中国恩菲工程技术有限公司 | Method for collecting acid water of refuse dump |
| CN116377959A (en) * | 2023-06-05 | 2023-07-04 | 生态环境部南京环境科学研究所 | System and method for treating sandy soil landfill solid waste polluted river |
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| CN105862982A (en) * | 2016-03-31 | 2016-08-17 | 大连久鼎祥瑞特种工程技术研究院有限公司 | Rainwater or surface-water rapid storing permeating-underground radiation well technology |
| CN209428159U (en) * | 2018-12-07 | 2019-09-24 | 中冶南方都市环保工程技术股份有限公司 | Phreatic water extracts restoration processing system out |
| CN212403573U (en) * | 2020-06-16 | 2021-01-26 | 上海格林曼环境技术有限公司 | Interception ditch for controlling underground water pollution |
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| CN113833522B (en) * | 2021-08-20 | 2023-08-11 | 中国恩菲工程技术有限公司 | Method for collecting acidic water in dumping site |
| CN116377959A (en) * | 2023-06-05 | 2023-07-04 | 生态环境部南京环境科学研究所 | System and method for treating sandy soil landfill solid waste polluted river |
| CN116377959B (en) * | 2023-06-05 | 2023-08-15 | 生态环境部南京环境科学研究所 | System and method for treating sandy soil landfill solid waste polluted river |
| US11959238B1 (en) | 2023-06-05 | 2024-04-16 | Nanjing Institute Of Environmental Sciences, Mee | Treatment system and method for sandy soil landfill solid waste polluted river channel |
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Application publication date: 20210810 |