Soil remediation method

Abstract

The invention relates to a soil remediation method, which comprises the following steps that: 1) a liquid injecting well for injecting chitosan leacheate through a pump is arranged in a soil polluted area, the chitosan leacheate enters the inside of polluted soil through the liquid injecting well, soil percolate seeps through underground water, and heavy metal active ingredients in the soil and the underground water are eluted by the chitosan leacheate to form stable chitosan-metal chelate; and 2) a permeable reactive barrier filled with active substances is constructed in a direction which is vertical to the flow direction of the underground water at the periphery of the liquid injecting well, the soil percolate and the polluted underground water flow through the permeable reactive barrier filled with the active substances, and polluted substances such as the chitosan-metal chelate and the like in the soil and the underground water are removed. Through the soil remediation method, heavy metals in the soil can be effectively removed, a polluted underground water system can be remediated, and most of the heavy metals contained in the soil and the underground water can be gathered in the active substances of the permeable reactive barrier, so that the heavy metals can be recycled. The heavy metal content of the remediated soil and the water quality of the percolate passing through the reactive barrier meet the corresponding national standard.

Description

technical field [0001] The invention relates to soil repair, in particular to a soil repair method using chitosan leaching-permeable reaction wall. Background technique [0002] The existing simple chemical remediation methods for heavy metal-contaminated soil are expensive, cause secondary pollution to the environment, and have poor operability, especially for large-scale soil pollution control, which has specific operational difficulties. Chitosan (Chitosan), also known as soluble chitin, chitosan, chitosan, the chemical name is 2-amino-β-1,4-glucan, the molecular formula is (C 6 h 11 o 4 N)n is a natural cationic polysaccharide produced after deacetylation of chitin. With degradability, good film-forming properties, good biocompatibility, and certain antibacterial and anti-tumor properties, it has been widely used in medicine, food, chemical industry, environmental protection, agriculture and other industries, among which the environmental protection industry is used a...

AI Technical Summary

Problems solved by technology

However, there is no report that chitosan is used for soil remediation