In situ restoring agent for heavy metal polluted soil

Abstract

The invention concerns the repairing dose to repair the soil polluted by heavy metal, which belongs to the technique field of repairing soil polluted by heavy metal. The repairing dose mainly includes: Na unit soil, haibao stone, stick stone, coal powder and microorganism germ root. Every composition' rate by weight is: Na unit soil15--40%, haipao stone 10--50%, stick stone 10--30%, coal powder 5--30%, microorganism germ root 0--40%. The repairing dose in the invention has the advantages of low cost of material, simple working equipment, good effect and no second pollution.

Description

[0001] Field [0002] The invention belongs to the technical field of remediation of heavy metal polluted soil, in particular to the formula of a remediation agent for heavy metal polluted soil. Background technique [0003] Soil is the fertile and loose surface of the earth that can grow plants. It is a necessary means of production for human survival and development, and it is also the most basic, important and irreplaceable natural resource for human society. Therefore, the protection of the soil environment has long been concerned by people. Among soil pollutants, heavy metal pollutants are a typical class of priority pollutants. Many world-renowned environmental pollution incidents, such as the bone pain disease in Japan (1931-1972, in the basins of seven rivers in Toyama and Gunma prefectures in Japan, the unpurified cadmium-containing wastewater from the zinc smelter was discharged into the river, causing water bodies , soil pollution, people who have eaten cadmium-co...

AI Technical Summary

Problems solved by technology

In the remediation technology of heavy metal contaminated soil, most treatment technologies generally have unfavorable factors such as complicated equipment and high cost, and it is difficult to get people's conscious promotion and application in the practice of pollution control

[0005] 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; the leaching method needs to add surfactants, and there is a risk of polluting groundwater; pyrolysis The suction method is a method of recovering gas by heating. This method is not suitable for on-site operation and has high costs and narrow scope of application. The vitrification method changes the nature of the soil and is only suitable for serious pollution and small areas; Stabilization methods raise soil pH and do not work well on alkaline soils

[0006] In short, the current methods generally have problems such as high treatment costs, long treatment time, poor field operability and secondary pollution.

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