Efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil

Abstract

The invention provides an efficient solidifying and stabilizing repair agent aiming at heavy metal contaminated soil. The efficient solidifying and stabilizing repair agent comprises the following raw materials: gypsum, magnesium oxide, kieselguhr, carboxymethylcellulose-melamine formaldehyde resin and hydroxypropyl-modified SiO2 / chitosan nanoparticles. According to the agent provided by the invention, two organic matters are added, so that the additive amount of the inorganic matters can be greatly reduced, and the property of the soil is not greatly destroyed; meanwhile, the two organic matters are not easily decomposed in the soil, and the toxic level of the heavy metals in the environment still can be well reduced on the basis of reducing the damage to the property of the soil.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of heavy metal-contaminated soil, in particular to an efficient solidification, stabilization and restoration agent for heavy metal-contaminated soil. Background technique [0002] Heavy metals refer to a class of metal elements with a specific gravity greater than 5. The harm of heavy metal pollution is mainly reflected in two aspects. One is that heavy metals cannot be degraded in the environment and are used to accumulate in organisms to cause teratogenicity or mutation of organisms. On the other hand, heavy metals can be transmitted through the food chain. Once they enter the human body, After a period of accumulation, it will cause great harm to human health. The recently released National Soil Pollution Survey Bulletin pointed out that the total soil pollution rate in the country was 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted site...

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Problems solved by technology

Microbial remediation technology has the advantages of wide sources of microorganisms and low impact on the environment, but specific microorganisms can only deal with a single type of heavy metals, and are greatly affected by environmental conditions

[0006] The applicant has developed a stable repair agent for heavy metals in soil, which is formed by mixing gypsum, magnesium oxide, and diatomaceous earth, adding it to heavy metal-contaminated soil, through precipitation, adsorption, complexation, oxidation- Reduction and other effects chemically react with heavy metals such as cadmium, zinc, copper, lead, and mercury in the soil environment, making the heavy metals form a stable chemical form, preventing their migration and diffusion in the environment, thereby reducing the toxicity of heavy metals in the environment However, due to the use of a large amount of inorganic substances, it will have a certain impact on the physical properties of the soil, and the overall fertility level will decrease. However, diatomaceous earth is easy to decompose in the soil, and the repair effect on heavy metals is not strong. This application Through further research, people found that by adding two kinds of organic substances, the addition of inorganic substances can be greatly reduced without causing major damage to soil properties. On the basis of damage to soil properties, it can still reduce the toxicity of heavy metals in the environment

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