Study on the Remediation Effect of Plant Ash on Multiple Heavy Metal Contaminated Soil in Mining Area
The plant ash was selected as a stabilizing material to remediate the multiple heavy metal contaminated soil in mining area.The changes of heavy metal available content,speciation distribution and soil physicochemical properties under the treatment of adding different amounts of plant ash were investigated,and the remediation mechanism was discussed in combination with correlation analysis.The results showed that the plant ash could effectively reduce the available content of Pb,Zn and Cd in the contaminated soil of the mining area,promote the transformation of Pb,Zn and Cd from unstable forms to stable forms,and significantly increase the soil pH and cation exchange capacity.Under the optimal condition of 4%plant ash and 10 d remediation time,the stabilization efficiencies of Pb,Zn and Cd achieved 55.31%,60.78%and 39.56%respectively,with a soil pH of 7.53 and a cation exchange capacity of 17.98 cmol/kg.There was a significant positive correlation between heavy metal stabilization efficiency and soil pH as well as cation exchange capacity.The remediation mechanisms of plant ash on multiple heavy metal contaminated soil mainly include electrostatic adsorption and chemical precipitation.The research results can provide theoretical basis for the remediation practice of heavy metal contaminated soil in mining area.
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