DNAPL-polluted underground water in-situ remediation system and application method thereof

An in-situ remediation and groundwater technology, applied in the direction of contaminated groundwater/leachate treatment, water pollutants, water/sewage treatment, etc., can solve the problem of inability to determine the extraction location, limited extraction depth, incomplete extraction, etc. problems, to achieve the effect of ensuring uniform extraction, saving water and electricity, and preventing pipeline blockage

Active Publication Date: 2016-07-20
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the shortcomings existing in the prior art when extracting DNAPL, the extraction depth is limited, the extraction position cannot be determi...

Method used

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  • DNAPL-polluted underground water in-situ remediation system and application method thereof
  • DNAPL-polluted underground water in-situ remediation system and application method thereof

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Embodiment 1

[0042] Such as figure 1 As shown, a kind of in-situ remediation system for groundwater polluted by DNAPL in this embodiment includes a drilling 1, a filtering device and a single pump extraction device, and also includes a water injection device; wherein: the filtering device includes a concrete layer 16, bentonite layer 15 and sand filling layer 11, and are sequentially set in the drilling 1 from top to bottom; the static water level line 7 is set in the bentonite layer 15; the single pump extraction device includes a liquid ring pump 21, a pumping Lifting pipe 22, grid screen pipe 23 and well pipe 24, wherein: the liquid ring pump 21 is a water ring vacuum pump, the model is 2BV2060, and the flow rate is 27m 3 / h, the vacuum degree is 20000 Pa, the power is 1.1kw, and the rated voltage is 380V; the grid screen pipe 23 and the well pipe 24 are connected as a whole to pass through the concrete layer 16 and the bentonite layer 15 and be buried in the sand filling layer 11, And...

Embodiment 2

[0051] The basic structure of an in-situ remediation system for DNAPL-contaminated groundwater in this embodiment is the same as that in Embodiment 1, except that the liquid ring pump 21 has a model number of 1WZB-35; the lift in front of the pump is 6m;

[0052] An in-situ remediation system for DNAPL-contaminated groundwater in this embodiment was applied to a decommissioned factory in Nanjing. After testing, the groundwater level of the site was about 1.38m, the water surface was about 1.3m, and there was 0.8m thick DNAPL under the water surface;

[0053] The application method of the in-situ remediation system for groundwater polluted by DNAPL in this embodiment, the basic steps are the same as in Embodiment 1, the difference is that: drilling 1 deep 6m; before the extraction starts, the floating matter is extracted, and the floating matter After the basic extraction is completed, the nozzle of the grid screen 23 is lowered to the bottom of the well; after the extraction st...

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Abstract

The invention discloses a DNAPL-polluted underground water in-situ remediation system and its application method, and belongs to the field of soil and underground water pollution control technology. The DNAPL-polluted underground water in-situ remediation system comprises a drilling well, a filter unit, a single-pump extraction unit and a water injection device. The filter unit comprises a concrete layer, a bentonite layer and a sand-filling layer, which are successively arranged inside the drilling well. The single-pump extraction unit comprises a liquid ring pump, an extraction pipe, a grid-type screen casing and a well casing. The water injection device comprises a water injection pipe, a gas vent and a water injection pump. One end of the water injection pipe is inserted into the well casing, and the other end of the water injection pipe is connected to the water injection pump on the ground and fixed on the upper end face of the well casing. The gas vent is arranged in the upper end face of the well casing. By the application method of the DNAPL-polluted underground water in-situ remediation system, the problem that extraction depth is limited, extraction position cannot be determined and extraction is not thorough in the prior art is solved. The system of the invention has advantages of wide range of application, high extraction efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater pollution control, and in particular relates to an in-situ restoration system for groundwater polluted by DNAPL and an application method thereof. Background technique [0002] Soil and groundwater pollution refers to the intentional or unintentional application of substances harmful to humans and other living organisms into the soil due to human factors, so that the content of a certain component exceeds the self-purification capacity of the soil and groundwater or is significantly higher than that of the soil and groundwater environment. benchmarks or soil and groundwater environmental standards, and cause deterioration of soil and groundwater environmental quality. At present, the environmental problems of soil and groundwater pollution in our country are relatively serious, which has seriously restricted the sustainable development of the society, so it has received more and more ...

Claims

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Application Information

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IPC IPC(8): C02F1/00C02F1/28C02F101/30C02F103/06
Inventor 王磊龙涛林玉锁陈樯祝欣
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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