Chemical remediation method for contaminated soil

Abstract

The invention relates to a chemical remediation method for contaminated soil. A soil remediation device is used in the chemical remediation method. The soil remediation device comprises a frame, a moving unit, a liquid discharging unit and recycling units, wherein the moving unit is installed at the lower end of the frame; the liquid discharging unit is arranged in the frame; and the recycling units are symmetrically arranged at the inner left end and the inner right end of the frame. According to the remediation method for the contaminated soil, through an integrated design, all the procedures are completed in sequence from front to back through movement, so the remediation rate of the contaminated soil is greatly increased; treatment liquid is fully and uniformly sprayed into the contaminated soil in a spraying mode, and the treatment liquid and the contaminated soil are in full contact reaction; the contaminated soil is compacted to form a liquid guide groove, so the contaminated soil is treated in blocks; and meanwhile, the compacted soil is dug up and loosened, so the compacted contaminated soil can be remediated in the next treatment procedure.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for chemical remediation of polluted soil. Background technique [0002] At present, about 200 million mu of cultivated land in China has food safety and ecological safety problems, and nearly 30% of the land has been moderately or severely polluted by heavy metals. Among them, some areas in Liaoning, Hunan, Zhejiang, Jiangxi, Sichuan, Guizhou, Guangdong, Guangxi and other provinces have heavy metal pollution problems to varying degrees, and most of the soils have compound pollution of volatile organic compounds and cadmium, and most of them are polluted by cadmium. Mainly factories and mines. Exhaust gas, waste water, waste residues, vehicle exhaust emissions from industrial and mining enterprises, sludge from sewage treatment plants, industrial wastewater and slag dumping cause a large amount of soil compound pollution, sewage irrigation, chemical fertilizers...

AI Technical Summary

Problems solved by technology

[0003] The processing methods for chemical remediation of contaminated soil often have the following problems: 1. There are multiple steps in the processing of contaminated soil, often requiring multiple devices to perform different operations in sequence, which seriously increases the processing time of contaminated soil, making Low work efficiency; 2. The waste liquid formed after the reaction between the treatment liquid and the polluted soil cannot be discharged, and is absorbed by the soil inside the soil to form secondary pollution; 3. The treatment liquid cannot fully contact the polluted soil, resulting in part of the soil often still being polluted , the treatment is not thorough enough, so that the polluted soil is still in a polluted state as a whole

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