CN111892183A - Underground water organic pollution in-situ blocking repair barrier and in-situ blocking repair method - Google Patents
Underground water organic pollution in-situ blocking repair barrier and in-situ blocking repair method Download PDFInfo
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- CN111892183A CN111892183A CN202010686540.5A CN202010686540A CN111892183A CN 111892183 A CN111892183 A CN 111892183A CN 202010686540 A CN202010686540 A CN 202010686540A CN 111892183 A CN111892183 A CN 111892183A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention discloses a groundwater organic pollution in-situ barrier repair barrier based on a super-hydrophilic selective permeable membrane, which comprises a first non-woven fabric layer, a graded sandstone layer, a second non-woven fabric layer, the super-hydrophilic selective permeable membrane and a geotextile layer which are sequentially arranged, wherein the graded sandstone layer is fixed between the first non-woven fabric layer and the second non-woven fabric layer through a needling process, and the non-woven fabric layer adopts polypropylene non-woven fabric or polyester non-woven fabric; the particle size of the sand and stone of the graded sand and stone layer is 0.1-0.5mm, and the thickness of the graded sand and stone layer is about 5 mm; the geotextile layer is made of polypropylene woven cloth. The invention also discloses a method for blocking organic pollution by using the barrier. The method does not need to completely seal the polluted site, and can effectively intercept pollutants.
Description
Technical Field
The invention relates to the field of groundwater pollution treatment, in particular to a groundwater organic pollution in-situ blocking and repairing barrier and an in-situ blocking and repairing method based on a super-hydrophilic selective permeable membrane.
Background
In recent years, organic pollution in underground water caused by oil overflow or chemical leakage and the like is more and more emphasized, after the organic pollutant leaks, the diffusion and migration can be carried out in a long time, and the underground water is polluted for a long time, so that the harm to human health and natural environment is more extensive. Therefore, the effective treatment of organic pollutants in groundwater is an urgent problem to be solved in terms of human health and environmental protection.
Chinese patent publication No. CN 107720853A discloses a DNAPL pollution remediation system and method in groundwater based on pollution control, the system comprises a vertical barrier wall, a pumping treatment unit and a recharging unit, the vertical barrier wall is arranged around a polluted area to block the polluted groundwater in the vertical barrier wall; the pumping treatment unit comprises a plurality of pumping wells and surface treatment facilities which are distributed in the polluted area, and the polluted underground water is pumped out through the pumping wells and is sent to the surface treatment facilities for treatment; the recharging unit comprises a plurality of recharging well pipes, and water treated by the surface treatment facility is recharged to a target aquifer of the polluted area through the recharging well pipes. The material of the barrier wall used in the method is mainly HDPE geomembrane.
The Chinese patent publication No. CN 109610518A discloses a pollution barrier structure and an anti-seepage system, which comprises a rigid anti-seepage layer, a seepage guide and drainage layer, a flexible anti-seepage layer, a groundwater guide and drainage layer and a compaction base layer which are sequentially arranged from top to bottom, wherein the rigid anti-seepage layer is used for primary anti-seepage, the seepage guide and drainage layer is used for collecting seepage leaked liquid leaked from the rigid anti-seepage layer and guiding the leaked liquid to a centralized treatment point, the flexible anti-seepage layer is used for secondary anti-seepage, the compaction base layer is used for increasing the bearing capacity of the base and avoiding uneven settlement, and the pollution barrier structure is used for preventing the leaked liquid from entering soil to pollute groundwater.
The invention discloses a separation method for repairing a polluted site in a non-excavation mode, and the separation method is characterized in that a muddy clay layer in soil is used as a bottom separation layer, and a vertical separation wall with a depth reaching the muddy clay layer is built to form a polluted site separation space with a horizontal separation layer and a vertical separation layer. The silt clay layer is used as the horizontal blocking layer, the vertical blocking walls are arranged on the periphery of the silt clay layer, the periphery and the bottom of a polluted area are blocked on the basis of a high-pressure injection triple-pipe waterproof curtain pile construction process, pollutants are effectively blocked, and the pollutants are prevented from vertically infiltrating downwards and horizontally diffusing along with underground water.
The barrier systems involved in the above methods are impervious to all materials, which requires that the site must be completely sealed to prevent the spread of contaminants. This greatly increases the construction scale and the engineering difficulty. The method has more components, and the requirements on the process and the operation steps are accurate, so that the method is not beneficial to later maintenance; in the application process, a drainage system is needed, the hydraulic characteristics of underground water and the stratum structure are easily changed, and therefore the repair efficiency is reduced and the ground subsidence is caused to different degrees.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an in-situ barrier repair barrier for groundwater organic pollution based on a super-hydrophilic selective permeable membrane.
The invention also aims to provide a method for carrying out in-situ barrier remediation on underground water organic pollution by using the barrier remediation barrier.
The purpose of the invention is realized by the following technical scheme:
an in-situ barrier repair barrier for organic pollution of underground water comprises a first non-woven fabric layer, a graded sandstone layer, a second non-woven fabric layer, a super-hydrophilic selective permeation membrane and a geotextile layer which are sequentially arranged, wherein the graded sandstone layer is fixed between the first non-woven fabric layer and the second non-woven fabric layer through a needling process, and the non-woven fabric layer is made of polypropylene non-woven fabric or polyester non-woven fabric; the particle size of the sand and stone of the graded sand and stone layer is 0.1-0.5mm, and the thickness of the graded sand and stone layer is about 5 mm; the geotextile layer is made of polypropylene woven cloth.
The super-hydrophilic selective permeation membrane is prepared by adopting a separation membrane preparation method for groundwater pollution remediation disclosed by Chinese patent publication No. CN 111137952A (application No. 202010206747.8).
A method for carrying out in-situ barrier remediation on underground water organic pollution by using the in-situ barrier remediation barrier comprises the following steps:
(1) carrying out geological exploration on the site, and knowing the soil layer distribution and the groundwater flow direction of the site, wherein the depth of a geological exploration well is 30cm below a waterproof top plate;
(2) carrying out site investigation and risk assessment on a site, describing the pollution plume range and the pollution degree of underground water by using GMS and/or sufer software, predicting the pollution trend of the pollution plume, and reasonably arranging a blocking barrier and a natural attenuation monitoring well according to the pollution tendency;
(3) arranging the in-situ blocking and repairing barrier by vertical pollution feathers according to the underground water flow direction, the soil layer structure, the pollution feather distribution and the pollution trend;
(4) and arranging natural attenuation monitoring wells at two sides of the in-situ blocking and repairing barrier, wherein 3 natural attenuation monitoring wells are arranged at the inner side of the in-situ blocking and repairing barrier, 2 natural attenuation monitoring wells are arranged at the outer side of the in-situ blocking and repairing barrier, 1 monitoring well at the inner side of the in-situ blocking and repairing barrier is arranged in the pollution plume range, and 2 monitoring wells are arranged outside the boundary of the pollution plume.
Preferably, the transverse boundary of the in-situ barrier repair barrier is positioned 200cm outside the boundary of the pollution plume; the longitudinal boundary is up to the ground surface and down to 50cm below the water-proof top plate.
Preferably, the natural attenuation monitoring well is exposed to the ground by 20-40cm, the whole well head penetrates through a aquifer to be repaired, and the bottommost part of the monitoring well is located 30cm below the waterproof top plate.
The monitoring well is made of PVC-U materials.
The invention has the following beneficial effects:
1. the barrier based on the super-hydrophilic selectively permeable membrane only prevents the migration of organic pollutants and allows the passage of underground water, so that the hydraulic conditions at two sides of the barrier system cannot be changed, the disturbance to the underground water environment is hardly generated, power facilities and a drainage system are not needed in the engineering application process, and the problems of reduction of repair efficiency and ground collapse at different degrees caused by the change of the hydraulic characteristics and the stratum structure of the underground water are avoided;
2. compared with the traditional separation and seepage-proofing method, the invention does not need to completely separate the polluted area, only needs to arrange a separation barrier in the area near the polluted feather, does not need to carry out large-scale excavation and earthwork engineering of the traditional process, not only reduces the engineering difficulty, but also can effectively retain pollutants;
3. the invention integrates the prevention and control barrier and the monitoring natural attenuation system, has simple implementation structure, does not need ground devices, has low construction, operation and maintenance cost, reduces the environmental risk, and can avoid secondary pollution through long-term monitoring;
4. the composite barrier is combined into a whole through a needling process, the thickness of the composite barrier is far smaller than that of a traditional separation anti-seepage structure, the excavation width is reduced, and the construction is easy.
Drawings
FIG. 1 is a schematic cross-sectional view of the barrier for in-situ barrier repair of organic contamination of groundwater according to the present invention;
FIG. 2 is a schematic diagram of a longitudinal section structure of the barrier for in-situ barrier repair of organic pollution of underground water in the application process;
FIG. 3 is a schematic view of the top view of the barrier for in-situ barrier repair of organic contamination in groundwater according to the present invention.
Wherein:
1-a first nonwoven layer; 2-graded sandstone; 3-a second nonwoven layer; 4-super hydrophilic permselective membranes; 5-geotextile layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the structure of the barrier for in-situ blocking and repairing of organic pollution of groundwater according to the present invention will be further described with reference to the accompanying drawings and examples.
The super-hydrophilic selective permeation membrane used in this example is a separation membrane prepared by the method for preparing a separation membrane for groundwater pollution remediation disclosed in chinese patent publication No. CN 111137952 a.
Example one
As shown in fig. 1-3, the groundwater organic pollution in-situ barrier repair barrier based on the super-hydrophilic permselective membrane comprises a first non-woven fabric layer 1, a graded sandstone layer 2, a second non-woven fabric layer 3, a super-hydrophilic permselective membrane 4 and a geotextile layer 5 which are sequentially arranged. The graded sandstone layer 2 is fixed between the first non-woven fabric layer 1 and the second non-woven fabric layer 3 through a needling process. The first non-woven fabric layer and the second non-woven fabric layer are both polypropylene non-woven fabrics or polyester non-woven fabrics; the particle size of the sand and stone of the graded sand and stone layer is 0.1-0.5mm, and the thickness of the graded sand and stone layer is about 5 mm; the geotextile layer adopts polypropylene woven cloth.
The method for carrying out in-situ barrier remediation on underground water organic pollution by using the in-situ barrier remediation barrier comprises the following steps:
(1) carrying out geological exploration on the site, wherein the aim is to know the soil layer distribution of the site and the groundwater flow direction, and the depth of a geological exploration well is 30cm below a waterproof top plate;
(2) carrying out site investigation and risk assessment on a site, describing the pollution plume range and the pollution degree of underground water by using GMS and/or sufer software, predicting the pollution trend of the pollution plume, and reasonably arranging a blocking barrier and a natural attenuation monitoring well according to the pollution tendency;
(3) according to the underground water flow direction, the soil layer structure, the pollution plume distribution and the pollution trend, vertically arranging the in-situ blocking and repairing barrier, wherein the transverse boundary of the in-situ blocking and repairing barrier is positioned 200cm outside the boundary of the pollution plume; the longitudinal boundary is up to the ground surface and down to 50cm below the waterproof top plate;
(4) and arranging natural attenuation monitoring wells at two sides of the in-situ blocking and repairing barrier, wherein 3 natural attenuation monitoring wells are arranged at the inner side of the in-situ blocking and repairing barrier, 2 natural attenuation monitoring wells are arranged at the outer side of the in-situ blocking and repairing barrier, 1 monitoring well at the inner side of the in-situ blocking and repairing barrier is arranged in the pollution plume range, and 2 monitoring wells are arranged outside the boundary of the pollution plume. The natural attenuation monitoring well is made of PVC-U materials, the natural attenuation monitoring well is exposed out of the ground by 20-40cm, the whole well head penetrates through a aquifer to be repaired, and the bottommost part of the monitoring well is located 30cm below the waterproof top plate.
The barrier based on the super-hydrophilic permselective membrane is arranged in the downstream direction of the pollution plume and is used for preventing the pollution plume from further diffusing, and meanwhile, due to the selective permeability of the super-hydrophilic permselective membrane, only the diffusion of pollutants is prevented, but the passing of underground water is not prevented, so that a matched drainage system is not required. Furthermore, the barrier based on a superhydrophilic permselective membrane also only needs to be placed near the contamination plume, not needing to completely enclose it.
The natural attenuation monitoring well is used for monitoring the concentration of pollutants in underground water for a long time, and the concentration and the total amount of the pollutants are reduced by utilizing the natural attenuation effect of a polluted site, so that the pollution remediation target is reached within a reasonable time range.
Claims (5)
1. The utility model provides a barrier is restoreed in separation of groundwater organic pollution normal position which characterized in that: comprises a first non-woven fabric layer, a graded sandstone layer, a second non-woven fabric layer, a super-hydrophilic selective permeation membrane and a geotextile layer which are arranged in sequence, wherein the graded sandstone layer is fixed between the first non-woven fabric layer and the second non-woven fabric layer through a needling process,
the non-woven fabric layer is made of polypropylene non-woven fabric or polyester non-woven fabric;
the particle size of the sand and stone of the graded sand and stone layer is 0.1-0.5mm, and the thickness of the graded sand and stone layer is about 5 mm;
the geotextile layer is made of polypropylene woven cloth.
2. A method for in situ barrier remediation of organic contamination of groundwater using the in situ barrier remediation barrier of claim 1, comprising the steps of:
(1) carrying out geological exploration on the site, and knowing the soil layer distribution and the groundwater flow direction of the site, wherein the depth of a geological exploration well is 30cm below a waterproof top plate;
(2) carrying out site investigation and risk assessment on a site, describing the pollution plume range and the pollution degree of underground water by using GMS and/or sufer software, predicting the pollution trend of the pollution plume, and reasonably arranging a blocking barrier and a natural attenuation monitoring well according to the pollution tendency;
(3) arranging the in-situ blocking and repairing barrier by vertical pollution feathers according to the underground water flow direction, the soil layer structure, the pollution feather distribution and the pollution trend;
(4) and arranging natural attenuation monitoring wells at two sides of the in-situ blocking and repairing barrier, wherein 3 natural attenuation monitoring wells are arranged at the inner side of the in-situ blocking and repairing barrier, 2 natural attenuation monitoring wells are arranged at the outer side of the in-situ blocking and repairing barrier, 1 monitoring well at the inner side of the in-situ blocking and repairing barrier is arranged in the pollution plume range, and 2 monitoring wells are arranged outside the boundary of the pollution plume.
3. The method of claim 2, wherein: the transverse boundary of the in-situ barrier repair barrier is positioned 200cm outside the boundary of the pollution plume; the longitudinal boundary is up to the ground surface and down to 50cm below the water-proof top plate.
4. The method of claim 3, wherein: the natural attenuation monitoring well is exposed to the ground by 20-40cm, the whole well head penetrates through a aquifer to be repaired, and the bottommost part of the monitoring well is located 30cm below the waterproof top plate.
5. The method of claim 4, wherein: the monitoring well is made of PVC-U materials.
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| CN202010686540.5A CN111892183B (en) | 2020-07-16 | 2020-07-16 | In-situ blocking repair method for underground water organic pollution |
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| CN202010686540.5A CN111892183B (en) | 2020-07-16 | 2020-07-16 | In-situ blocking repair method for underground water organic pollution |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05317850A (en) * | 1992-05-20 | 1993-12-03 | Taisei Corp | Method for purifying polluted ground water |
| CN104805871A (en) * | 2015-04-30 | 2015-07-29 | 北京高能时代环境技术股份有限公司 | Compound type perpendicular seepage-proofing screen and application thereof |
| CN206089212U (en) * | 2016-09-01 | 2017-04-12 | 中湘环保股份有限公司 | But pollutant permeable reactive wall |
| CN209113512U (en) * | 2018-11-05 | 2019-07-16 | 天津中联格林科技发展有限公司 | A kind of permeable reactive barrier |
| CN110607808A (en) * | 2019-10-16 | 2019-12-24 | 北京高能时代环境技术股份有限公司 | In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method |
| CN111137952A (en) * | 2020-03-23 | 2020-05-12 | 中新瑞美(天津)环保科技有限公司 | Preparation method of separation membrane for groundwater pollution remediation |
| CN210797471U (en) * | 2019-04-26 | 2020-06-19 | 天津生态城市政景观有限公司 | Saline-alkali region water resource regulation, storage and utilization system containing biological retention tank |
-
2020
- 2020-07-16 CN CN202010686540.5A patent/CN111892183B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05317850A (en) * | 1992-05-20 | 1993-12-03 | Taisei Corp | Method for purifying polluted ground water |
| CN104805871A (en) * | 2015-04-30 | 2015-07-29 | 北京高能时代环境技术股份有限公司 | Compound type perpendicular seepage-proofing screen and application thereof |
| CN206089212U (en) * | 2016-09-01 | 2017-04-12 | 中湘环保股份有限公司 | But pollutant permeable reactive wall |
| CN209113512U (en) * | 2018-11-05 | 2019-07-16 | 天津中联格林科技发展有限公司 | A kind of permeable reactive barrier |
| CN210797471U (en) * | 2019-04-26 | 2020-06-19 | 天津生态城市政景观有限公司 | Saline-alkali region water resource regulation, storage and utilization system containing biological retention tank |
| CN110607808A (en) * | 2019-10-16 | 2019-12-24 | 北京高能时代环境技术股份有限公司 | In-situ barrier coiled material for preventing pollutant from diffusing, preparation method and construction method |
| CN111137952A (en) * | 2020-03-23 | 2020-05-12 | 中新瑞美(天津)环保科技有限公司 | Preparation method of separation membrane for groundwater pollution remediation |
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Effective date of registration: 20230629 Address after: 5-1-305 Tianjin Science and Technology Plaza (Tiankai Garden), west of Kexue East Road, Nankai District, 300000 Tianjin Patentee after: Tianjin Yongxu New Materials Co.,Ltd. Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |