Heavy metal contaminated soil remediation agent and preparation method thereof

Abstract

The invention provides a heavy metal contaminated soil remediation agent. The heavy metal contaminated soil remediation agent is prepared from the following raw materials in parts by mass: 50-65 parts of modified biomass charcoal, 20-30 parts of organic matters, 6-15 parts of composite microbial agents, 5-10 parts of polyacrylamide, 12-20 parts of organic fertilizer and 6-12 parts of iron powder, wherein the modified biomass charcoal is obtained by mixing and modifying the biomass charcoal and sodium sulfide, and the organic matters are obtained by mixing humic acid, potassium humate and fulvic acid potassium according a mass ratio of (2 to 4):(6 to 8):3. The invention also provides a preparation method of the heavy metal contaminated soil remediation agent. According to the heavy metal contaminated soil remediation agent provided by the invention, the preparation process is simple; the conditions are mild; the removal rate of heavy metal in soil after remediation is high; the soil remediation effect is good; the heavy metal contaminated soil remediation agent has relatively high practical significance.

Description

technical field [0001] The invention relates to a soil pollution remediation agent, in particular to a heavy metal polluted soil remediation agent. Background technique [0002] Soil is an important part of the human environment, an indispensable and non-renewable natural resource, an important basis for the survival of all living things, and an important place for the exchange and circulation of materials and energy in the earth's ecosystem. With the rapid development of industrialization and urbanization in our country, heavy metals will continue to enter the soil environment due to the massive discharge of pollutants, the use of unqualified agricultural materials, and the unreasonable mining of mineral resources. Soil pollution is caused, so that the problem of soil environmental pollution is becoming more and more serious, especially the problem of soil heavy metal pollution. Soil heavy metal pollution is concealed, long-term and irreversible. Pollutants stay in the soi...

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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

[0004] Some of the above-mentioned remediation methods for heavy metal-contaminated soil cannot completely eliminate heavy metals in the soil, and some even bring new pollutants, all of which have various defects. A soil remediation agent that does not produce new pollution is very necessary

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