CN108314106B - DNAPL (deoxyribonucleic acid-styrene-acrylonitrile copolymer) polluted underground water in-situ remediation method - Google Patents
DNAPL (deoxyribonucleic acid-styrene-acrylonitrile copolymer) polluted underground water in-situ remediation method Download PDFInfo
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Abstract
The invention discloses an in-situ remediation method for underground water polluted by DNAPL, belonging to the technical field of soil and underground water pollution control. The invention relates to a DNAPL (deoxyribonucleic acid-Polypropylene liquid) polluted underground water in-situ remediation system, which comprises a drilling well, a filtering device, a single-pump extraction device and a water injection device, wherein the drilling well is connected with the filtering device; the filtering device comprises a concrete layer, a bentonite layer and a sand filling layer, and is sequentially arranged in the well from top to bottom; the single-pump extraction device comprises a liquid ring pump, an extraction pipe, a grid type sieve pipe and a well pipe; the water injection device comprises a water injection pipe, an exhaust hole and a water injection pump, wherein one end of the water injection pipe is inserted into the well pipe, and the other end of the water injection pipe is connected with the water injection pump on the ground and is fixed on the upper end surface of the well pipe; the exhaust hole is arranged on the upper end surface of the well pipe. The method for applying the DNAPL-polluted underground water in-situ remediation system solves the problems that the extraction depth is limited, the extraction position cannot be determined, the extraction is not thorough and the like in the prior art, and has the advantages of wide application range, high extraction efficiency and the like.
Description
The invention is a divisional application, a parent application number: 2014108173333, respectively; name of mother case: an in-situ remediation system for underground water polluted by DNAPL and an application method thereof; application date of the parent: 2014-12-24.
Technical Field
The invention belongs to the technical field of soil and underground water pollution control, and particularly relates to an in-situ remediation method for underground water polluted by DNAPL.
Background
The pollution of soil and underground water refers to a phenomenon that substances harmful to human beings and other living bodies are intentionally or unintentionally applied to soil due to human factors, so that the content of certain components of the substances exceeds the self-purification capacity of the soil and the underground water or is obviously higher than the environmental standard of the soil and the underground water or the environmental standard of the soil and the underground water, and the environmental quality of the soil and the underground water is deteriorated. At present, the environmental problem of soil and underground water pollution in China is serious, and the sustainable development of the society is severely restricted, so that the method is increasingly and widely concerned by the nation. In particular, the national groundwater pollution prevention and control plan (2011-.
The main sources of soil and groundwater contamination can be roughly divided into: discharging industrial waste gas, waste water and waste residues; a large amount of chemicals such as pesticides and fertilizers are used; and (5) irrigating with sewage. The main hazards of soil pollution are: the yield and the quality of crops are reduced, drinking water sources are polluted, and the health of human bodies is threatened; pollutants are accumulated in crops and are enriched in human bodies through a food chain; and other secondary ecological environment problems such as atmospheric pollution, surface water pollution, underground water pollution and ecological system degradation.
Heavy Non-Aqueous Phase liquids (DNAPL) are themselves composed of one or several Liquid organic compounds, the formation of which in groundwater is generally of a large quantity, mostly due to leakage and large discharge. Because DNAPL has the characteristics of high density, low interfacial tension, difficult degradability and the like, and can penetrate through an unsaturated-saturated water-containing system and stay at the bottom of a water-containing layer, DNAPL is a durable pollution source in underground water, and can be continuously dissolved in the underground water to pollute the underground water and soil of the water-containing layer. In view of this, in a general contaminated site remediation, it is necessary to first check whether DNAPL exists in the site, and if so, the DNAPL should be removed first to perform subsequent remediation, otherwise, the remediated soil and groundwater still suffer from secondary contamination.
Chinese patent publication No.: 202539176U, published date: the patent document on 11/21/2012 discloses an in-situ multiphase extraction and disposal device for volatile organic compounds in soil and underground water. The utility model discloses a by extraction well system, extract and gas-liquid separation system and tail gas clean-up system constitute. Volatile pollutants in soil and underground water are sucked into the centrifugal gas-liquid separator for gas-liquid separation by the extraction well system under the action of negative pressure generated by the vortex air pump and the Roots vacuum pump, the dehydrated and dried gas firstly enters the filter for filtration, then enters the gas-liquid separation type activated carbon adsorber through the vortex air pump and the Roots vacuum pump, the pollutants in the gas are adsorbed and purified by activated carbon, and the purified gas is discharged from the exhaust funnel through a pipeline. The three systems are combined for application, so that the effects of separating, extracting, purifying again and discharging up to the standard of volatile organic pollutants in the polluted soil and the underground water can be achieved, secondary pollution is not generated, and a good repairing effect can be achieved on the ground energy of a typical industrial polluted field. The utility model discloses an utilize atmospheric pressure to take water out through the vacuum pump application negative pressure, consequently even if under ideal circumstances, the extraction degree of depth to water can not exceed 10 meters (apart from the well head). For DNAPL with higher density, the extraction depth will be shallower.
Chinese patent publication No.: 103926172A, published date: patent literature 7/16/2014 discloses an experimental device and method for simulating a surfactant-enhanced remediation process of DNAPL pollutants in an aquifer. The method adopts a two-dimensional visual sand box to simulate the aquifer, can directly observe and record the vertical and horizontal migration of DNAPL pollution plumes, quantitatively calculates the diffusion area change of pollutants, has the advantages of intuition and visualization in the aspects of repair efficiency estimation and pollutant migration risk control, and can optimize the process at the early stage of engineering, particularly the type and concentration of the optimal surfactant. However, the water injection in the invention is used for supplementing the water quantity in the system, the surfactant is introduced by the water injection to improve the repair effect of the DNAPL, and the water injection and the water pumping do not belong to the same water source, so that the effect of the water injection is completely different from that of the water pumping in the invention.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the defects that the extraction depth is limited, the extraction position cannot be determined, the extraction is incomplete and the like when DNAPL is extracted in the prior art, the invention provides an in-situ remediation method for underground water polluted by DNAPL. The invention can realize the purpose of recovering DNAPL substances in deeper underground water and can be widely applied to the remediation of the underground water polluted by the DNAPL.
2. Technical scheme
The invention principle is as follows: the extraction device in the prior art is a technology for applying negative pressure through a vacuum pump and extracting a polluted medium by utilizing atmospheric pressure, so that the extraction depth of water cannot exceed 10 meters even under the condition of zero vacuum degree; for DNAPL that is denser than water, the extraction depth will be shallower. In the extraction process of the extraction device, the water level in the well can slowly drop to cause more and more difficulty in extraction, and in order to avoid the drop of the water level, a water injection pipe is connected in parallel beside the extraction pipe, the water level height above the DNAPL is increased by intermittent or continuous water injection, and then the DNAPL is extracted to a greater extent by means of water pressure. Theoretically, the extraction depth of DNAPL can be increased to more than 30 meters, and the method is particularly suitable for stratum structures of Yangtze river watersheds in China and shallow underground water burial depths in south China.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an underground water in-situ remediation system polluted by DNAPL comprises a drilling well, a filtering device, a single-pump extraction device and a water injection device; wherein: the filtering device comprises a concrete layer, a bentonite layer and a sand filling layer, and is sequentially arranged in the well from top to bottom; a static water level line is arranged on the bentonite layer; the single-pump extraction device comprises a liquid ring pump, an extraction pipe, a grid type sieve pipe and a well pipe, wherein: the grid type sieve tube and the well pipe are connected into a whole and penetrate through a concrete layer and a bentonite layer to be buried in a sand filling layer, and a structure with the well pipe arranged above and the grid type sieve tube arranged below is formed by taking a static water line as a boundary line; one end of the extraction pipe is inserted into the bottom of the grid type sieve pipe, and the other end of the extraction pipe is connected with the liquid ring pump on the ground and fixed on the upper end surface of the well pipe; the water injection device comprises a water injection pipe, an exhaust hole and a water injection pump, wherein one end of the water injection pipe is inserted into the well pipe, and the other end of the water injection pipe is connected with the water injection pump on the ground and is fixed on the upper end surface of the well pipe; the exhaust hole is arranged on the upper end surface of the well pipe.
Preferably, the part of the extraction pipe on the ground surface is provided with a vacuum gauge.
Preferably, one end of the extraction pipe inserted into the bottom of the grid type screen pipe is provided with a water contact induction probe.
Preferably, the water filling device further comprises a water filling flow control mechanism which enables the water level not to exceed the static water level line.
Preferably, the water injection flow control mechanism is a water level sensor fixed at the bottom end of the water injection pipe; the water injection pump is a variable frequency water pump.
Preferably, the grid type screen pipe and the well pipe are made of polyvinyl chloride.
An in-situ remediation method of DNAPL polluted underground water, comprising the following steps:
A. selecting a plot with underground water polluted by DNAPL to be drilled, and inserting a grid type screen pipe and a well pipe which are connected into a whole into a drilled well in a manner that the grid type screen pipe is arranged at the lower part and the well pipe is arranged at the upper part along the vertical central line of the drilled well;
B. filling a sand filling layer, a bentonite layer and a concrete layer into the well in sequence, and fixing the grid type sieve tube and the well pipe in the well;
C. will extract pipe and water injection pipe and insert the well casing in proper order and fix the up end at the well casing, wherein: the extraction pipe is inserted into the grid type sieve pipe; the water injection pipe is inserted into the position of the static water level line;
D. before extraction begins, the vacuum degree of the system is adjusted to the lowest by controlling an exhaust valve of an extraction device, and after extraction begins, the vacuum degree is gradually increased to control the extraction flow within a set range;
E. when the extraction flow rate is reduced, a water injection pipe starts to inject water into the drilling well, the water injection flow rate is controlled to be equivalent to the extraction flow rate, and the water level in the well is controlled not to exceed a static water level line;
F. when no DNAPL exists, the extraction is stopped to wait for DNAPL to flow back, or the next well is switched to for extraction.
Preferably, in the step E, a surfactant is injected into the well through a water injection pipe.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the DNAPL-polluted underground water in-situ remediation system, the single-pump extraction device and the water injection device are matched for use, the extraction depth can be deepened when the DNAPL-polluted underground water is remediated, and the single-pump extraction device is portable, flexible, convenient and fast to move; the sand filling layer is matched with the grid type sieve tube, so that the pipeline can be effectively prevented from being blocked;
(2) according to the DNAPL-polluted underground water in-situ remediation system, the arrangement of the vacuum gauge can effectively control the extraction efficiency and master the water injection time;
(3) according to the DNAPL-polluted underground water in-situ remediation system, the water contact induction probe can more conveniently and effectively determine the position of the DNAPL;
(4) according to the DNAPL-polluted underground water in-situ remediation system, the water injection flow control mechanism is used, so that the liquid level can keep the water pressure, and the normal operation of the single-pump extraction device is ensured;
(5) according to the DNAPL-polluted underground water in-situ remediation system, the water level sensor and the variable frequency water pump are used, so that the uniform extraction effect of the single-pump extraction device can be more effectively ensured, and water and electricity can be saved;
(6) according to the DNAPL-polluted underground water in-situ remediation system, polyvinyl chloride is stable in chemical property and corrosion-resistant, and the grid type sieve tube and the well pipe are effectively prevented from being corroded by DNAPL;
(7) according to the DNAPL-polluted underground water in-situ remediation method, the equipment is portable, the maneuverability is strong, the remediation steps are simple and easy to operate, the working efficiency is high, and the DNAPL-polluted underground water in-situ can be thoroughly remedied;
(8) according to the DNAPL-polluted groundwater in-situ remediation method, the surface tension of DNAPL can be reduced and the extraction efficiency can be improved by applying the surfactant;
(9) the DNAPL-polluted groundwater in-situ remediation method can theoretically increase the extraction depth of DNAPL to be more than 30 meters, is particularly suitable for stratum structures of Yangtze river drainage basins in China and regions with shallow groundwater burial depth in south, and has wide application range.
Drawings
FIG. 1 is a schematic structural view of the present invention;
figure 2 is a top plan view of an upper end face of a well pipe of the present invention.
The reference numerals in the schematic drawings illustrate: 1. drilling a well; 7. a static water line; 8. a water contact sensing probe; 11. filling a sand layer; 15. a bentonite layer; 16. a concrete layer; 21. a liquid ring pump; 22. an extraction pipe; 23. a grid screen; 24. a well pipe; 26. a vacuum gauge; 31. a water injection pipe; 33. an exhaust hole; 34. a water injection pump; 35. a water level sensor.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Example 1
As shown in fig. 1, the system for in-situ remediation of groundwater contaminated by DNAPL of the embodiment comprises a drilling well 1, a filtering device, a single-pump extraction device, and a water injection device; wherein: the filtering device comprises a concrete layer 16, a bentonite layer 15 and a sand filling layer 11, and is sequentially arranged in the well 1 from top to bottom; a static water level line 7 is arranged on the bentonite layer 15; the single-pump extraction device comprises a liquid ring pump 21, an extraction pipe 22, a grid type sieve pipe 23 and a well pipe 24, wherein: the liquid ring pump 21 is a water ring vacuum pump with the model of 2BV 2060 and the flow of 27m3H, vacuum degree of 20000 Pa, power of 1.1kw, and rated voltage of 380V; the grid type sieve tube 23 and the well pipe 24 are connected into a whole and penetrate through the concrete layer 16 and the bentonite layer 15 to be buried in the sand filling layer 11, the static water line 7 is used as a boundary line to form a structure with the well pipe 24 arranged above and the grid type sieve tube 23 arranged below, the grid type sieve tube 23 is a section 4.5-9.0 m underground, is made of hard PVC, has horizontal fine seams on the surface, has the width of the fine seams of 0.25mm, and is closed at the bottom; the well pipe 24 is made of rigid PVC with the inner diameter of 70 mm; one end of the extraction pipe 22 is inserted into the bottom of the grid screen 23, the bottom is provided with a water contact induction probe 8, and the other end is connected with a liquid ring pump 21 on the ground, as shown in figure 2, and is fixed on the well pipe24, the extraction pipe 22 is a vacuum hose with the length of 15m and the outer diameter of 25mm, and a vacuum gauge 26 is arranged on the ground; the water injection device comprises a water injection pipe 31, an exhaust hole 33 and a water injection pump 34, wherein: one end of the water injection pipe 31 is inserted into the well pipe 24, a water level sensor 35 is fixed at the bottom end of the water injection pipe 31, the other end of the water injection pipe 31 is connected with a water injection pump 34 on the ground and fixed on the upper end surface of the well pipe 24, and the water injection pipe 31 is a water injection hose with the length of 10m and the outer diameter of 15 mm; the exhaust hole 33 is arranged on the upper end surface of the well pipe 24, and the water injection pump 34 is a variable frequency water pump.
The DNAPL-polluted underground water in-situ remediation method comprises the following steps:
A. taking a land plot of a abandoned pesticide plant in east China as an example, through detection, the water level of shallow groundwater in the land is 1.2-1.9 m away from the ground surface, the depth of DNAPL (surface layer is 7.9m away from the ground surface), and the thickness of the DNAPL is about 130 cm; firstly, drilling a 12m deep well 1, firstly, inserting a grid type screen pipe 23 and a well pipe 24 which are connected into a whole into the well 1 in a manner that the grid type screen pipe 23 is arranged at the lower part and the well pipe 24 is arranged at the upper part along the vertical central line of the well 1;
B. the inside of the well 1 is filled with a sand filling layer 11, a bentonite layer 15 and a concrete layer 16 in sequence, and a grid screen 23 and a well pipe 24 are fixed in the well 1, wherein: the sand filling layer 11 is formed by backfilling clean quartz sand with the particle size of more than or equal to 0.25mm as a water filtering layer, has a filtering effect, is backfilled to the position of an underground water line, the upper part of the sand filling layer 11 is backfilled with a watertight bentonite layer 15 to play an adsorption effect, and the last concrete layer 16 is backfilled to a natural terrace by cement mortar at a well mouth to play a fixing effect;
C. the extraction pipe 22 and the water injection pipe 31 are inserted into the well pipe 24 in this order and fixed to the upper end face of the well pipe 24, wherein: the extraction pipe 22 is inserted inside the grid screen 23; the water injection pipe 31 is inserted to the position of the static water level line 7;
D. before the extraction is started, an exhaust valve of the water ring vacuum pump is controlled to release air and open, the vacuum degree is the lowest, and after the extraction is started, the vacuum degree is gradually increased until the stable flow rate is 0.08L/s;
E. along with the reduction of the water level in the well and the increase of the DNAPL ratio, the extraction flow rate is very slow (less than 0.01L/s) once, the water injection pipe 31 starts to inject water into the well 1, the water injection flow rate is controlled to be equivalent to the extraction flow rate, the water level is maintained at about 3.2m from the ground surface, namely the water level in the well is controlled not to exceed the static water level line 7 through the water contact induction probe 8; and injecting a surfactant into the well 1 through the water injection pipe 31; the extraction flow rate is obviously increased after water injection and reaches 0.055L/s; the extracted fluid enters a liquid-liquid separation tank for separation and recovery;
F. when the water level sensor 35 senses that no DNAPL exists, the extraction is stopped to wait for DNAPL to flow back, or the next well 1 is switched to for extraction.
Example 2
The basic structure of the DNAPL-polluted groundwater in-situ remediation system of the embodiment is the same as that of the embodiment 1, except that: the liquid ring pump 21 model is: 1 WZB-35; the pump head is 6 m;
the DNAPL-polluted underground water in-situ remediation system is applied to a certain decommissioning factory of Nanjing, and the detection shows that the underground water level of the site is about 1.38m, the water level is about 1.3m, and the DNAPL with the thickness of 0.8m is arranged below the water level;
the method for in-situ remediation of DNAPL-polluted groundwater of the embodiment is the same as the method of the embodiment 1 in basic steps, and is different from the method of the embodiment in that: drilling 1 depth 6 m; extracting the suspended matters before the extraction is started, and after the basic extraction of the suspended matters is finished, lowering the pipe orifice of the grid type sieve pipe 23 to the bottom of the well; the extraction flow rate is slower (about 0.03L/s) along with the rising of DNAPL in the pipe after the extraction is started; at the moment, water injection is started, the water surface is maintained to be about 1.5m away from the earth surface, and the extraction flow rate is obviously increased to reach 0.045L/s after water injection; the extracted fluid is guided into a liquid collecting bucket for recovery.
The invention and its embodiments have been described above schematically, without limitation, and the embodiments shown in the drawings are only one of the embodiments of the invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent.
Claims (2)
1. An in-situ remediation method of underground water polluted by DNAPL, which applies an in-situ remediation system of underground water, wherein the system comprises a filtering device, a single-pump extraction device and a water injection device; wherein:
the filter device comprises a concrete layer (16), a bentonite layer (15) and a sand filling layer (11), and is sequentially arranged in the well (1) from top to bottom; a static water level line (7) is arranged on the bentonite layer (15);
the single-pump extraction device comprises a water ring vacuum pump, an extraction pipe (22), a grid type sieve pipe (23) and a well pipe (24), wherein the grid type sieve pipe (23) and the well pipe (24) are connected into a whole and penetrate through a concrete layer (16) and a bentonite layer (15) to be buried in a sand filling layer (11), and a static water line (7) is used as a boundary line to form a structure with the well pipe (24) on the top and the grid type sieve pipe (23) on the bottom;
one end of the extraction pipe (22) is inserted into the bottom of the grid type sieve pipe (23), and the other end of the extraction pipe is connected with the liquid ring pump (21) on the ground and fixed on the upper end face of the well pipe (24);
the water injection device comprises a water injection pipe (31), an exhaust hole (33) and a water injection pump (34), wherein: one end of a water injection pipe (31) is inserted into the well pipe (24), and the other end of the water injection pipe is connected with a water injection pump (34) on the ground and fixed on the upper end face of the well pipe (24); the exhaust hole (33) is arranged on the upper end surface of the well pipe (24);
a vacuum gauge (26) is arranged on the ground part of the extraction pipe (22), and a water contact induction probe (8) is arranged at one end of the extraction pipe (22) inserted into the bottom of the grid type sieve pipe (23);
the method comprises the following steps:
A. selecting a land parcel with underground water polluted by DNAPL to be drilled out of a well (1), and inserting a grid type sieve tube (23) and a well pipe (24) which are connected into a whole into the well (1) along the vertical central line of the well (1) at the lower part and the upper part of the well pipe (24) in the form of the grid type sieve tube (23);
B. filling a sand filling layer (11), a bentonite layer (15) and a concrete layer (16) into the well (1) in sequence, and fixing a grid type screen pipe (23) and a well pipe (24) in the well (1);
C. sequentially inserting an extraction pipe (22) and a water injection pipe (31) into the well pipe (24) and fixing the extraction pipe and the water injection pipe to the upper end face of the well pipe (24), wherein: the extraction pipe (22) is inserted into the inside of the grid type sieve pipe (23); the water injection pipe (31) is inserted into the position of the static water level line (7);
D. before the extraction is started, the vacuum degree of the system is adjusted to the lowest degree by controlling an exhaust valve of a single-pump extraction device, and after the extraction is started, the vacuum degree is gradually increased to control the extraction flow within a set range;
E. when the extraction flow rate is reduced, a water injection pipe (31) starts to inject water into the well (1), the water injection flow rate is controlled to be equivalent to the extraction flow rate, and the water level in the well is controlled not to exceed a static water level line (7);
F. when no DNAPL exists, stopping the extraction and waiting for DNAPL to flow back, or changing to the next well (1) for extraction.
2. The method of in situ remediation of DNAPL contaminated groundwater as claimed in claim 1, wherein: and in the step E, injecting a surfactant into the well drilling (1) through a water injection pipe (31).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810258558.8A CN108314106B (en) | 2014-12-24 | 2014-12-24 | DNAPL (deoxyribonucleic acid-styrene-acrylonitrile copolymer) polluted underground water in-situ remediation method |
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| CN201410817333.3A CN105776361B (en) | 2014-12-24 | 2014-12-24 | A kind of underground water in-situ remediation system and its application process by DNAPL pollutions |
| CN201810258558.8A CN108314106B (en) | 2014-12-24 | 2014-12-24 | DNAPL (deoxyribonucleic acid-styrene-acrylonitrile copolymer) polluted underground water in-situ remediation method |
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| CN102228900A (en) * | 2011-05-18 | 2011-11-02 | 华北电力大学 | In situ integrated restoring system and method of petroleum polluted soil |
| CN102583712A (en) * | 2012-02-21 | 2012-07-18 | 清华大学 | Method and system by using micro-nano bubbles to perform reinforcement in-situ remediation on polluted ground water |
| CN202379856U (en) * | 2011-12-29 | 2012-08-15 | 北京市环境保护科学研究院 | Air injection system for remedying volatile organic pollutants in underground water in situ |
| CN202466645U (en) * | 2012-01-17 | 2012-10-03 | 常州市环境科学研究院 | Extraction-recharge well applied to restoration work of polluted underground water on site |
| CN102936062A (en) * | 2012-10-30 | 2013-02-20 | 苏州唯盛环境修复科技有限公司 | Underground water pollution in-situ restoration method based on synchronous shattering hydrodynamic circulation |
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| JPH0696143B2 (en) * | 1991-05-27 | 1994-11-30 | 日本地下水開発株式会社 | Method and apparatus for removing groundwater pollutants |
| CN102774965A (en) * | 2012-06-01 | 2012-11-14 | 北京市水利规划设计研究院 | In-situ repair system for treating pollution of underground water |
| CN102923822B (en) * | 2012-11-08 | 2014-05-14 | 中国环境科学研究院 | Restoring device and restoring method for treating fluorine pollution of groundwater |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228900A (en) * | 2011-05-18 | 2011-11-02 | 华北电力大学 | In situ integrated restoring system and method of petroleum polluted soil |
| CN202379856U (en) * | 2011-12-29 | 2012-08-15 | 北京市环境保护科学研究院 | Air injection system for remedying volatile organic pollutants in underground water in situ |
| CN202466645U (en) * | 2012-01-17 | 2012-10-03 | 常州市环境科学研究院 | Extraction-recharge well applied to restoration work of polluted underground water on site |
| CN102583712A (en) * | 2012-02-21 | 2012-07-18 | 清华大学 | Method and system by using micro-nano bubbles to perform reinforcement in-situ remediation on polluted ground water |
| CN102936062A (en) * | 2012-10-30 | 2013-02-20 | 苏州唯盛环境修复科技有限公司 | Underground water pollution in-situ restoration method based on synchronous shattering hydrodynamic circulation |
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| CN105776361A (en) | 2016-07-20 |
| CN108314106A (en) | 2018-07-24 |
| CN105776361B (en) | 2018-06-08 |
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