Study on the effects of new developed biochar and sludge composite materials on copper and lead contaminated soil and its remediation mechanism

Xiao Wang, Qing Guo, Xiaoyan Wang, Yong Jia, Wanke Chen, Qianfeng Zhang, Jing Yuan
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Abstract

In this study, composite repair material was obtained by composting and fermentation of straw biochar and sludge according to the mass ratio of 1:4. The remediation effect of its composite remediation materials on heavy metals copper (Cu) and lead (Pb) in soil was investigated. The characterization results of the composite remediation material showed that the material had rich pore structure, high specific surface area and rich functional groups such as hydroxyl, carbonyl and carboxyl groups, and had high adsorption capacity for heavy metals in contaminated soil. The passivation effect of Cu and Pb in contaminated soil was investigated under different application amount (3%, 5%) and passivation time (15d, 60d). The changes of Cu and Pb content, availability and morphology distribution in the soil before and after the addition of remediation materials were analyzed. The results showed that the passivation effect of Cu and Pb in soil was significantly enhanced with increasing passivation time and application amount. In conclusion, the addition of remediation materials effectively reduced the content and effectiveness of heavy metals in the soil and promoted the change of Cu and Pb morphology in the heavy metal-contaminated soil, thus realizing the remediation of the heavy metal-contaminated soil.

Abstract Image

新型生物炭与污泥复合材料对铜铅污染土壤的修复效果及修复机理研究
本研究将秸秆生物炭与污泥按1:4的质量比进行堆肥发酵,得到复合修复材料。研究了其复合修复材料对土壤中重金属铜、铅的修复效果。复合修复材料的表征结果表明,该材料具有丰富的孔隙结构、高比表面积和丰富的羟基、羰基、羧基等官能团,对污染土壤中的重金属具有较高的吸附能力。研究了不同施用量(3%、5%)和钝化时间(15d、60d)下Cu、Pb在污染土壤中的钝化效果。分析了添加修复材料前后土壤中Cu、Pb含量、有效性和形态分布的变化。结果表明,随着钝化时间和施用量的增加,土壤中Cu和Pb的钝化效果显著增强。综上所述,修复材料的添加有效降低了土壤中重金属的含量和有效性,促进了重金属污染土壤中Cu和Pb形态的变化,从而实现了重金属污染土壤的修复。
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