Preparation method and application of heavy metal contaminated soil remediation agent

By using repairing agents composed of alkali-modified cotton straw biochar, sepiolite, humic acid and calcium silicate, the problem of poor restoration effect of heavy metal contaminated soil in the prior art is solved, and the effect of efficiently reducing the effectiveness of heavy metals and improving the soil environment is achieved.

CN119685034AActive Publication Date: 2025-03-25山东省土壤污染防治中心
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Patent Information

Application Number
CN202411956534.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-29
Publication Date
2025-03-25
Estimated Expiration
2044-12-29

AI Technical Summary

Technical Problem

The prior art has poor repair results when dealing with heavy metal contaminated soil, and is costly and long cycles. It is difficult to effectively reduce the residue and toxicity of heavy metals, affecting ecological restoration and environmental beautification.

Method used

A heavy metal contaminated soil repair agent is used, with the main compositions including alkali-modified cotton straw biochar, sepiolite, humic acid and calcium silicate. It is prepared by mixing and grinding, applied to heavy metal contaminated soil and tilled, significantly reducing the effectiveness of heavy metals in the soil.

Benefits of technology

This repairing agent can significantly reduce the content of effective mercury, arsenic, cadmium and lead in the soil, increase the soil pH value, reduce the absorption and enrichment of heavy metals by crops, and provide a low-cost, efficient, simple and environmentally friendly bioremediation method.

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Abstract

The invention belongs to the technical field of heavy metal pollution treatment, and relates to a preparation method and application of a heavy metal polluted soil remediation agent. The heavy metal contaminated soil remediation agent mainly comprises the following components in parts by weight: 20-30 parts of alkali modified cotton straw biochar, 5-10 parts of sepiolite, 15-20 parts of humic acid and 5-10 parts of calcium silicate. The heavy metal contaminated soil remediation agent can effectively remove mercury, arsenic, cadmium and / or lead pollution in heavy metal contaminated soil and improve the heavy metal contaminated soil environment. After the soil remediation agent is used for treating the heavy metal cadmium contaminated soil, the pH value of the soil can be increased, absorption and enrichment of crops to cadmium and lead are reduced, and the method is a novel bioremediation method which is low in cost, efficient, simple, convenient and environmentally friendly.
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