A kind of heavy metal polluted soil remediation agent and preparation method thereof

Abstract

The invention provides a heavy metal polluted soil remediation agent, which is composed of the following raw materials in parts by mass: 50-65 parts of modified biochar, 20-30 parts of organic matter, 6-15 parts of composite microbial bacterial agent, 5-65 parts of polyacrylamide 10 parts, 12-20 parts of organic fertilizer, 6-12 parts of iron powder; the modified biomass charcoal is obtained by mixing and modifying biomass charcoal and sodium sulfide; the organic matter is composed of humic acid, potassium humate, fulvic acid Potassium is obtained by mixing according to the mass ratio of 2-4:6-8:3. The invention also protects the preparation method of the heavy metal polluted soil remediation agent. The heavy metal-contaminated soil remediation agent of the invention has simple preparation process, mild conditions, high removal rate of heavy metals in soil after remediation, good soil remediation effect, and 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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