Conditioning agent for heavy metal contaminated soil and preparation method thereof

Abstract

The invention provides a conditioning agent for heavy metal contaminated soil. The conditioning agent for heavy metal contaminated soil is prepared from the following raw materials in parts by mass: 50-60 parts of modified activated carbon, 15-24 parts of humic acid, 4-12 parts of a compound microbial agent, 9-15 parts of sodium sulfide, 12-19 parts of monopotassium phosphate, 8-20 parts of diatomite, 6-12 parts of calcium oxide, 10-20 parts of modified zeolite and 15-20 parts of an organic fertilizer; wherein the modified activated carbon is obtained by performing reduction modification on aferric salt with activated carbon; the modified zeolite is obtained by acidifying and thermally activating natural zeolite. The invention further provides a preparation method of the conditioning agent for heavy metal contaminated soil. The conditioning agent for heavy metal contaminated soil is simple in preparation process, mild in condition, capable of adsorbing and fixing heavy metal in soil and improving the soil structure and good in remediation effect.

Description

technical field [0001] The invention relates to soil pollution conditioning, in particular to a conditioning agent for heavy metal polluted soil and a preparation method thereof. Background technique [0002] Soil is an important part of the human environment, an indispensable and non-renewable natural resource, an important basis for all living things to survive, and an important place for material and energy exchange and circulation in the earth's ecosystem. With the rapid development of my country's industrialization and urbanization, the massive discharge of pollutants, the use of unqualified agricultural materials, and the unreasonable exploitation of mineral resources have made heavy metals continue to enter the soil environment. It causes soil pollution, which makes the soil environmental pollution problem more and more serious, especially the soil heavy metal pollution problem. Heavy metal pollution in soil is concealed, long-term and irreversible. The pollutants sta...

AI Technical Summary

Problems solved by technology

A large number of polluted plots not only have heavy metal pollution, but also serious toxic organic pollution, which poses a serious threat to the surrounding residents and the ecological environment.

[0003] At present, the remediation technologies for heavy metal-contaminated soil mainly include: soil replacement method, in-situ or ex-situ chemical leaching, thermal desorption method, vitrification repair, etc. Among them, the soil replacement method requires a large amount of engineering and high investment costs , destroy the soil structure, and properly treat the contaminated soil to prevent secondary pollution. Therefore, it is not suitable for the treatment of large-scale contaminated soil; in-situ or ex-situ chemical leaching, this method has high cost, and The reagents used for washing the soil will cause secondary pollution after entering the soil; the thermal desorption method can only be used to deal with volatile heavy metals, such as mercury, etc., and the process requires a lot of energy consumption and high economic costs ;Vitrification repair, this method has high repair efficiency, but the repaired soil needs to be landfilled, the repair cost is high and the repaired soil can no longer be used for agriculture

Images