A Method for Remediating Chlorinated Hydrocarbon Contaminated Sites by In-Situ Chemical Oxidation

Abstract

The invention relates to a method for in-situ chemical oxidation repairing of chlorinated hydrocarbon polluted sites. First, fine sand is sprayed into the ground with a powder spray pile machine to increase the content of soil sand particles and improve the soil structure to achieve a better water permeability effect; then the oxidant, The mixture of catalyst and cement is sprayed into the ground with a powder-spraying pile machine. After the cement solidifies, the agent is wrapped into a ball to achieve the purpose of its slow release; the fine sand is sprayed into the ground separately with a powder-spraying pile machine, and then the catalyst and cement are sprayed into the ground. The mixture is sprayed into the ground with a powder spray pile machine, and sprayed into the downstream position of the ground water; after the cement is solidified, the hydrogen peroxide is injected into the upstream position of the ground water through the injection well; the fine sand in the present invention can increase the content of soil sand particles and improve the soil quality. The structure achieves a good water permeability effect. The solidified cement wraps the oxidant and the catalyst into agglomerates, which can effectively delay the dissolution of the agent, and the water-permeable structure formed by the injection of fine sand provides a good channel for the contact reaction between hydrogen peroxide and the catalyst. , to improve the oxidation efficiency of the oxidant.

Description

A method for in-situ chemical oxidation repairing chlorinated hydrocarbon polluted site technical field The present invention relates to a kind of method for in-situ chemical oxidation repairing chlorinated hydrocarbon polluted site, belong to the in-situ chemical of soil Field of Oxidation Methods. Background technique [0002] Chlorinated hydrocarbon solvents are widely used in chemical industry as important chemical raw materials and organic solvents. Depend on Due to the large-scale production, use, and improper storage of chlorinated hydrocarbons, they enter the soil and groundwater and become common in the environment. Pollutants, especially chloroform, trichloroethane, trichloroethylene and tetrachloroethylene. Chlorinated hydrocarbons are often carcinogenic, It is teratogenic and mutagenic, and its carbon-hydrogen bond energy is high, so that chlorinated hydrocarbons can persist in the environment, increasing their impact on human health and Toxic effects o...

AI Technical Summary

Problems solved by technology

However, due to the complexity of soil structure and chemical composition, humic acid, reducing metals and other substances in the soil will consume a large amount of oxidants

In addition, the migration direction and range of chemical oxidants injected into the soil are not directional, and in areas with poor soil permeability, the transmission rate of chemical oxidants is slow, which affects their oxidation efficiency.

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