Method for determining in situ injection repair diffusion radiuses of contaminated soil and underground water

A technology of diffusion radius and polluted soil, applied in the restoration of polluted soil, diffusion analysis, earthwork drilling, etc. It can solve the problem of determining the effective diffusion radius of the agent and optimizing the parameters of the hole layout, not considering the effect of the agent diffusion, and waste of mechanical costs. and other problems, to achieve the effect of convenient and fast testing, saving test time and cost, and ensuring accuracy and difference analysis.

Active Publication Date: 2016-09-28
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of determining the effective diffusion radius of the drug and optimizing the hole layout parameters in the design of the existing in-situ injection repair system. At present, most of the empirical methods are used to determine the effective diffusion radius of the drug. The accuracy is poor and the effective response of the drug is not considered. The influence of groundwater flow on the diffusion of chemicals during the period causes problems such as waste of mechanical costs
Furthermore, a method for determining the diffusion radius of in-situ injection of contaminated soil and groundwater is provided

Method used

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  • Method for determining in situ injection repair diffusion radiuses of contaminated soil and underground water
  • Method for determining in situ injection repair diffusion radiuses of contaminated soil and underground water

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Embodiment 1

[0079] This embodiment is a field test method for determining the effective diffusion radius of the agent in the restoration of organically polluted soil and groundwater restoration projects using the in-situ chemical oxidation in-situ injection method. There are no operations specifically described in this embodiment, which have been given in reference to the content of the invention. method is carried out.

[0080] This project is a soil and groundwater remediation project for a chemical plant in Nanjing. The maximum soil remediation depth is 12m. There are two layers of silty clay layers, and the aquifer is a silty sand layer (distributed at 3-6m or 4-7m). The buried groundwater is shallow ( about 1m) and abundant. The target pollutants in soil and groundwater are VOCs / SVOCs organic compounds such as chlorobenzene, benzene, p / o-nitrochlorobenzene, etc. One of the difficulties in in-situ restoration of this project is the lack of practical experience and design basis in Chi...

Embodiment 2

[0098] Such as image 3 , Figure 4 As shown, this embodiment is the optimization process of soil and groundwater in-situ injection repair hole layout parameters. It is based on the groundwater flow in the repair site, the difference in soil layer permeability, and the effectiveness of the repair agent under the condition that the effective diffusion radius is obtained in Example 1. The process of optimizing hole layout parameters based on factors such as reaction time. A brief description is as follows:

[0099] Obtained the recommended value of effective diffusion radius of two kinds of typical soil layers among the embodiment 1, the R of sandy soil class (as silty fine sand aquifer) is 2.9m, the R of clay class (as silty clay) 0 It is 0.9m. The triangular method is adopted for the hole layout method, and the hole layout method 1 is adopted for the sandy soil, considering the influence of groundwater flow on the row spacing of the hole layout parameters, and the row spaci...

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Abstract

The invention discloses a method for determining in situ injection repair diffusion radiuses of contaminated soil and underground water. According to the method, points are distributed according to a triangle method, pitch-row is designed to be perpendicular to the flowing direction of the underground water, array pitch is in the flowing direction of the underground water, and the flow expansion of a repair reagent in the underground water within the reaction effective time is taken into account. The method comprises three steps: firstly, observation method: the repair reagent and a definite proportion of bromide ion serving as tracers are simultaneously injected into an aqueous stratum in the condition of high pressure whirl spraying injection. The diffusion of the reagent is judged by observing the phenomena of grout return and grout leaking between adjacent injection points; secondly, bromide ion tracer method: after the completion of injection, underground water depth setting rapid sampling is performed, the concentration of the tracers is rapidly detected in field, and the concentration of the bromide ion in the underground water is compared with a background value; thirdly, bromide ion tracer method and observation method: the optimum diffusion radiuses are determined through synthetic judgment. The method is applied to optimal design of diffusion radiuses and hole arrangement parameters and monitoring of injection effect in soil and underground water in situ injection tests and repair construction.

Description

technical field [0001] The invention relates to a method for determining the diffusion radius of contaminated soil and groundwater in situ injection restoration, and belongs to the technical field of monitoring methods for restoration of contaminated soil and groundwater. Background technique [0002] Groundwater pollution and remediation have received attention in recent years, and many in-situ remediation technologies for groundwater, such as permeable reactive wall (PRB), extraction-treatment, in-situ chemical remediation, and in-situ microbial remediation, have been applied in domestic projects. Compared with stirring technology, in-situ injection technology has lower energy consumption, so it is more widely used, especially in the field of groundwater remediation. The good permeability of the aquifer is conducive to the addition of highly water-soluble remediation agents. The important reason why in-situ restoration technology is favored is that it can solve the problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003E21B47/11B09C1/00B09C2101/00G01N33/24E21D1/00B09C1/002B09C1/08
Inventor 杨乐巍李书鹏张岳张晓斌郭丽莉崔双超宋晓威陈凡尹鹏程刘鹏刘岩牛强
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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