A Research on Remediation Technology for Thallium and Arsenic Contaminated Soil At Industrial Sites
A remediation technology for thallium and arsenic contaminated soil in industrial sites has been developed.An iron-manganese-based mixed powder repair agent was prepared using common chemicals including potassium chloride,manganese chloride,potassium hydroxide,expanded perlite,and phosphogypsum,and underwent isothermal plasma treatment.The preparation process of the agent is simple and it possesses strong oxidation and adsorption properties.The experimental results show that under the conditions of a remediation time of 7 days,a ratio of 3∶10 of manganese chloride to iron chloride in the remediation agent,a solid-to-liquid ratio of 25∶100 of expanded perlite powder to the iron-manganese chloride mixture,and a mass ratio of 3∶10 of phosphogypsum to the iron-manganese-based mixed powder,the stabilization efficiency of thallium and arsenic in polluted soil reached 99.21%and 99.68%,respectively.Furthermore,the BCR method was used to analyze the forms of thallium and arsenic in soil,revealing that after remediation,thallium and arsenic mainly exist in residual form in the soil,significantly reducing their potential harm to the environment.This study provides an efficient and environmentally friendly solution for the remediation of heavy metal contaminated soil in industrial sites.
Soil RemediationThalliumArsenicIron manganese based mixed powderBCR method
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