Method for repairing polluted sites

Abstract

The invention provides a method for repairing polluted sites. The method for repairing the polluted sites comprises the steps that firstly, soil of the polluted sites is selected, a pollutant microorganism culture medium is prepared, microorganism strains capable of effectively treating organic pollutants in the soil can be selected and cultured, separating and purifying are carried out to obtainmixed microorganism bacterium liquid, then water is added to the polluted soil to prepare a slurry soil mixed solution, a pH value is adjusted, finally the mixed microorganism bacterium liquid, a surfactant, potassium ferrate and hydrogen peroxide are added into the mixed solution, and the mixture is placed silently after ultrasonic treatment. According to the method for repairing the polluted sites, combined with biological treatment and chemical oxidation methods, rapid and efficient remediation of soil contaminated by typical organochlorine pesticides such as DDT, HCH and the like can be realized, the surfactant is a mixture of saponin and activated carbon, sufficient contact between potassium ferrate and the organochlorine pesticides can be increased, and the repair cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated sites, and in particular relates to a method for remediating contaminated sites. Background technique [0002] Soil and / or groundwater pollution has been caused due to the production, operation, use, storage, and stacking of toxic and hazardous substances, or the treatment and disposal of toxic and hazardous wastes, or the migration of toxic and hazardous substances, or accidents, and has caused health and ecological risks or hazardous plots, known as contaminated sites. [0003] Urban industrial polluted land can be roughly divided into four categories. One is heavy metal pollution sites, mainly from iron and steel smelting enterprises, tailings and solid waste storage sites in the chemical industry. Representative pollutants include arsenic, lead, cadmium, chromium, etc.; the other is persistent organic pollutant pollution sites, For example, pesticides that have been produ...

AI Technical Summary

Problems solved by technology

Among them, incineration and rotary kiln co-processing have high energy consumption, and usually require long-distance transshipment, and the problem of secondary pollution is more prominent; although the cost of steam extraction and thermal desorption is lower than that of incineration and rotary kiln, the volatility of organochlorine pesticides is usually Poor, the effect of steam extraction is not good, thermal desorption requires high energy consumption and solves the problems of tail gas treatment and secondary pollution, and it has no technical and economic advantages for soil polluted by medium and low concentration organochlorine pesticides; bioremediation Organochlorine pesticides pollute the soil for a long period, and the removal of pollutants is limited. It is difficult to meet the requirements of urban land development for rapid restoration of the site; in-situ chemical leaching can easily expand the contaminated area, while ex-situ chemical leaching requires post-processing of the eluent. deal with