Remediation agent for heavy metal contaminated soil as well as preparation method and using method of remediation agent

Abstract

The invention provides a remediation agent for heavy metal contaminated soil as well as a preparation method and a using method of the remediation agent. The remediation agent is prepared from the following components in parts by weight: 20-80 parts of a mineral material, 10-70 parts of a biomass material, 5-40 parts of a redox agent, 5-50 parts of an adsorbent and 0-30 parts of a pH regulator. The preparation method comprises the following steps: mixing the five components according to a formula ratio, grinding, and screening to obtain the remediation agent for the heavy metal contaminated soil. The using method comprises the following steps: mixing the remediation agent for heavy metal contaminated soil with compound contaminated soil, adjusting the water content of the compound contaminated soil, and carrying out soil conservation and remediation. The remediation agent for the heavy metal contaminated soil can reduce the migration and bioavailability of the soil by reducing the heavy metal leaching concentration of the soil, thereby realizing the stabilization of the soil for the various heavy metals; the remediation agent for the heavy metal contaminated soil has the advantagesof being low in cost, short in repair period, good in repair effect, wide in application range and free from secondary pollution, and the like.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a heavy metal contaminated soil remediation agent and a preparation method and an application method thereof. Background technique [0002] The heavy metal stabilization technology is well used in the field of soil remediation, and the soil remediation agents involved are in various forms, but the mechanism of action is similar. The characteristics of contaminated soil determine the selection of remediation agents to a certain extent. However, at present, there is no fixed remediation plan in the pharmaceutical industry for remediation of heavy metal-contaminated soil. "Adjusting measures to local conditions" and "prescribing the right medicine" have become important principles in the field of soil remediation. [0003] The development of soil remediation agents started earlier in foreign countries, and today, the research and development of related materials...

AI Technical Summary

Problems solved by technology

[0006] 1. The restorative material itself has the problem of secondary pollution by heavy metals;

[0007] 2. The component type of the restoration agent is too single, or chemical reagents, or environmentally friendly ingredients;

[0008] 3. The synergistic repair effect between repair agent components needs to be improved;

[0009] 4. There are obvious differences in the application effect of restoration agent materials to contaminated soil from different sources;

[0010] 5. The repair mechanism is single, and the applicable environmental conditions are harsh;

[0011] 6. The repair efficiency is not enough to meet the treatment needs of higher pollution concentrations;

[0012] 7. It is difficult to further expand and optimize the repair time dimension

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