A kind of soil and groundwater solid-phase shallow layer stirring in-situ chemical oxidation repair method

Abstract

The invention provides a soil and groundwater solid-phase shallow layer stirring in-situ chemical oxidation restoration method, which belongs to the technical field of soil and groundwater restoration methods. The invention comprises the following steps: (1) site leveling, measuring partitions; (2) surface layer crushing and screening, setting cofferdams; (3) assembling shallow stirring equipment and debugging; (4) adding solid oxidant and activator; 5) shallow mixing construction; (6) surface curing; (7) chemical reaction and monitoring; (8) self-inspection and acceptance. The invention is applicable to the remediation of organic pollution in shallow saturated soil and groundwater, as well as the remediation of heavy pollution in groundwater, and can solve the problem of low chemical dosage parameters in one round of construction of shallow heavy organic pollution, and the upper limit of the oxidant K dosage ratio can reach 1.5 %~6%. The method of the invention has the advantages of simple operation, high construction efficiency, relatively long reaction period, sustainable reaction between the oxidant and the organic matter in the groundwater, and effectively prevents the rebound of the pollutant concentration in the groundwater.

Description

technical field [0001] The invention relates to a soil and groundwater solid-phase shallow layer stirring in-situ chemical oxidation restoration method, belonging to the technical field of soil and groundwater restoration methods. Background technique [0002] Heavy metal and organic pollution of soil and groundwater are two typical types of pollution at present. The single and compound pollution of shallow contaminated soil and groundwater is common in polluted sites due to many exposure routes. Compared with ex-situ restoration technology, in-situ restoration has the advantages of no secondary pollution and no additional site occupation, and is gradually favored. Soil and groundwater remediation technology mainly adopts physical, chemical and biological or combined technologies. Among them, the first problem to be solved by chemical or biological remediation engineering technology is how to uniformly add remediation agents (oxidants / reductants / microbial agents) to the und...

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Problems solved by technology

[0013] The purpose of the present invention is to solve the above-mentioned problems that the stirring depth of the existing in-situ remediation system is too large, and the injection well or high-pressure injection is difficult to ensure the shallow mixing effect, and further provide a kind of in-situ chemical oxidation of soil and groundwater solid phase shallow stirring Repair method

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