In-situ Chemical Oxidation Remediation Construction Method of Organic Contaminated Soil

Abstract

The invention relates to an in-situ chemical oxidation restoration construction method for organic contaminated soil and belongs to the field of soil restoration. The construction method comprises the steps of 1, leveling; 2, positioning; 3, drilling; 4, oxidizing agent preparation; 5, oxidizing agent injection; 6, activating agent preparation; 7, activating agent injection; and 8, maintenance. Through in-situ agent injection restoration of contaminated soil, soil structure damage caused by soil excavation is avoided, and restoration cost is reduced. Through activating agent injection, the oxidizability of an oxidizing agent can be improved, and restoration efficiency can be improved. The influence radius of agents is increased by means of the high-pressure jet grouting technique, and low-permeability contaminated soil can also be well restored. A restored site can still be used for secondary development and utilization, recycling application of land is achieved, and great economical benefits and social benefits are realized. The construction method is wide in application range, reliable in restoration effect, economical and feasible, can be used for restoring contaminated sites which can not be excavated, and can also be applied to contaminated sites with poor soil permeability.

Description

technical field [0001] The invention relates to an in-situ chemical oxidation restoration construction method of organic polluted soil, which belongs to the field of soil restoration. Background technique [0002] Due to the infiltration of harmful substances in oil, pesticides and municipal waste into soil and even groundwater, soil pollution has become a major environmental problem of common concern all over the world. There are usually two methods of ex-situ remediation and in-situ remediation to control soil pollution. Ex-situ remediation involves digging and transporting soil, which destroys the original soil structure. It is difficult to treat deeply polluted areas, and the operation cost is high. Repair replaced. The most widely used methods in in-situ remediation of organic contaminated soil include soil gas phase extraction, chemical leaching, and microbial remediation. However, these methods have some problems: [0003] 1. The gas phase extraction method only ha...

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Problems solved by technology

[0003] 1. The gas phase extraction method only has a good treatment effect on volatile organic compounds, and the treatment efficiency is low for deep soil areas with poor soil permeability, and the removal of pollutants is not thorough enough

[0004] 2. Chemical leaching technology is mostly used in porous and permeable soils, and is not suitable for non-water-soluble liquid pollutants, furan compounds strongly adsorbed on the soil, highly volatile organic compounds, and asbestos, etc.

[0005] 3. The treatment cycle of microbial restoration technology is longer, and the restoration bacteria are difficult to cultivate

[0006] In short, the existing in-situ soil remediation technology has many limitations, small scope of application, and poor universality.

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