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A method for in-situ extraction and remediation of polluted sites

A restoration method and site restoration technology, which is applied in the field of contaminated site restoration engineering, can solve problems such as poor treatment effect, increased labor safety, and re-pollution, so as to speed up the in-situ extraction speed, improve the extraction restoration effect, Simple operation effect

Active Publication Date: 2017-09-12
浙江博世华环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method needs to install the explosive package in advance, which increases the labor load and has the problems of safety and re-pollution, and this method is an in-situ extraction repair method, which has a multi-phase treatment effect on the polluted gas, groundwater, oil slick, etc. in the site. bad

Method used

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  • A method for in-situ extraction and remediation of polluted sites
  • A method for in-situ extraction and remediation of polluted sites
  • A method for in-situ extraction and remediation of polluted sites

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Experimental program
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Effect test

Embodiment 1

[0042] A pilot test was carried out at a decommissioned site of a chemical plant in Zhejiang Province.

[0043] 1. Using the in-situ extraction and restoration method of the polluted site of the present invention, the specific steps are as follows:

[0044] (1) Carry out site restoration investigation and determine the test area to be 100m 2 , the main pollutants on the site are benzene series such as toluene and ethylbenzene. -7 m / s.

[0045] (2) The number of designed wells is 4, the depth of each well is 6m, and the preliminary design extraction radiation radius is 3m; according to the pollution detection data, the number and spacing of the sand layer are set, and the elevation of the sand layer is from the ground to the bottom In order: 2m, 2.5m, 3.5m, 4m, 4.5m, 5.5m, 6m.

[0046](3) The devices required for installation and connection of this method are respectively a mixing device, an injection device, an extraction device and a monitoring device, wherein the mixing d...

Embodiment 2

[0059] An organic polluted site, located in eastern Zhejiang, is a decommissioned chemical plant area. Pollution area is about 600m 2 , the soil type is sticky clay and silty clay, and the permeability coefficient is only 3×10 -8 m / s, the pollutants are mainly gasoline hydrocarbons and diesel hydrocarbons.

[0060] Through detailed investigation, it was found that the pollution depth of the site was 3-7m. The site inspection found that light non-hydrophilic phase pollutants (LNAPLs) were suspended above the groundwater level and expanded laterally, becoming LNAPLs accumulation areas or lenses. The maximum concentration of pollutants is 2000mg / kg, and the pollutant content of this site exceeds the environmental standard. Therefore, new engineering restoration measures are required to eliminate the risk of the site.

[0061] Specific steps are as follows:

[0062] (1) The number of designed wells is 6, and the preliminary design extraction radiation radius is 6m. After strat...

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Abstract

The invention discloses an in-situ extraction repair method for a polluted site. The method includes investigation, well layout and extraction. It is characterized in that, after the well layout is completed, a sand layer is formed in the soil layer around the well by fracturing, This process is repeated to form multiple sand layers at different heights in the shaft, and then the pollutants are extracted. The invention pumps the mortar mixture into the soil at high pressure through fracturing to form cracks in the soil layer, and then forms a sand layer, increases the penetration capacity of the cohesive soil, accelerates the in-situ extraction speed, and thereby improves the extraction repair effect.

Description

technical field [0001] The invention relates to the field of contaminated site restoration engineering, in particular to an in-situ extraction and repair method for contaminated sites. Background technique [0002] In the process of industrialization in China over the past 30 years, due to the lack of environmental protection awareness and the lack of relevant laws, the rough enterprise development model has caused a large area of ​​soil to be polluted across the country. According to the national soil pollution survey data recently released by the Ministry of Environmental Protection, the overall soil environment in the country is not optimistic. Some areas have serious soil pollution. In response to such phenomena, the state and relevant ministries and commissions have successively issued a number of policies, regulations and standards on soil and groundwater remediation in the past two years, bringing technical and financial support to the site remediation industry and al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 陈昆柏温俊明段德超况武何佶马嘉伟来先豪施勇琪
Owner 浙江博世华环保科技有限公司