Method for remediating arsenic contaminated soil by using biochar reinforced pteris vittata

By applying 1% to 2% modified biochar to arsenic-contaminated soil and planting Centipede Grass, the problem of decreased remediation efficiency of Centipede Grass due to improper selection of biochar modification type was solved, and Centipede Grass was able to achieve efficient remediation of arsenic-contaminated soil. In particular, iron-aluminum modified biochar showed significant effects in lightly contaminated soil.

CN116689470BActive Publication Date: 2026-07-24INST OF LAND ENG & TECH SHAANXI PROVINCIAL LAND ENG CONSTR GRP CO LTD
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Patent Information

Application Number
CN202310774276.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-28
Publication Date
2026-07-24
Estimated Expiration
2043-06-28

AI Technical Summary

Technical Problem

In existing technologies, improper selection of biochar modification type and application amount can lead to a decrease or insignificant improvement in the ability of Pteris vittata to remediate arsenic-contaminated soil. The boundary conditions for the combined use of biochar and Pteris vittata are unclear, and existing methods suffer from high costs and uncertain effects.

Method used

Apply 1% to 2% biochar to arsenic-contaminated soil and plant uncontaminated centipede spores. Select straw biochar, iron-modified biochar, aluminum-modified biochar, or iron-aluminum-modified biochar, and prepare modified biochar by adjusting pH value and centrifugation separation process to promote the enrichment of arsenic by centipede.

Benefits of technology

The study improved the remediation efficiency of Pteris vittata for arsenic in lightly polluted soil and clarified the positive promoting effect of biochar on the remediation of arsenic-polluted soil by Pteris vittata. In particular, aluminum-modified and iron-aluminum-modified biochar showed significant effects in lightly polluted soil, and the remediation efficiency of Pteris vittata increased to 19.25%~26.24%.

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Abstract

The present application belongs to the technical field of soil remediation, and relates to a method for remediation of arsenic contaminated soil by Pteridium aquilinum Linn. with biochar. The present application uses biochar, including one of straw biochar, iron modified biochar, aluminum modified biochar and iron-aluminum modified biochar; 1% to 2% of biochar is applied to the arsenic contaminated soil in terms of mass ratio, which strengthens the arsenic remediation capacity of Pteridium aquilinum Linn. to the soil, and improves the efficiency of Pteridium aquilinum Linn. in remediation of arsenic in the soil to 19.25% to 26.24%. The boundary use conditions of the technology for remediation of heavy metal contaminated soil by biochar strengthened plant are not clear, and the present application eliminates the prejudice or misunderstanding of ordinary technical personnel in the field, including researchers in the field, that the modified biochar is superior to the biochar for remediation of arsenic contaminated soil. The present application enables the practitioners in the field to have a more comprehensive understanding of the biochar, especially the metal modified biochar, for remediation of arsenic contaminated soil.
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