Remediation agent for leaching soil polluted by heavy metal chrome

Abstract

The invention relates to a remediation agent for leaching soil polluted by heavy metal chrome. The invention belongs to the technical field of heavy-metal-polluted soil remediation. The remediation agent comprises mixed components of, by weight: 95% to 99% of citric acid and 1% to 5% of pyrolusite. The leaching agent provided by the invention has advantages of low raw material cost, high remediation speed, good effect, and easy recycling of waste liquid.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, in particular to the formulation of a washing agent for heavy metal-chromium-contaminated soil. Background technique [0002] At present, the area of ​​soil polluted by heavy metals in China is at least 20 million hectares. According to the national survey of sewage irrigation areas conducted by the Ministry of Agriculture of China, in the sewage irrigation areas of about 1.4 million ha, the area of ​​land polluted by heavy metals accounts for 64.8% of the area of ​​sewage irrigation areas. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, vehicle exhaust emissions in urban transportation, improper disposal of electronic waste, etc., will lead to Heavy metal pollut...

AI Technical Summary

Problems solved by technology

[0004] At present, the heavy metal-contaminated soil remediation technologies mainly include phytoremediation, electrodynamic remediation, leaching, thermal desorption, vitrification, and solidification and stabilization. Among the above heavy metal-contaminated soil treatment methods, phytoremediation requires considerable It takes a long time (decades or even hundreds of years) and there are problems with the treatment of plants; electrokinetic restoration is only suitable for small areas of pollution, and it is not easy to operate on site; thermal desorption is a method of recovering gas by heating, which is not suitable for on-site The operation and cost are high, and the scope of application is narrow. The vitrification method changes the properties of the soil and is only suitable for serious pollution and small areas. The stabilization method of adding lime improves the pH value of the soil and has an effect on alkaline soil. not good

In short, the current methods generally have problems such as high treatment cost, long treatment time, poor field operability and secondary pollution.

[0005] Although my country's soil remediation industry has just started and the situation of soil heavy metal pollution is severe, the prospect of the remediation industry is optimistic