工业场地铊、砷污染土壤修复技术研究  

A Research on Remediation Technology for Thallium and Arsenic Contaminated Soil At Industrial Sites

作　　者：阎丽[1] 范翘[1] 陈冬素 YAN Li;FAN Qiao;CHEN Dongsu(Hunan Research Academy of Environmental Sciences,Changsha,Hunan 410004,China)

机构地区：[1]湖南省环境保护科学研究院,湖南长沙410004

出　　处：《中国锰业》2024年第3期108-112,共5页China Manganese Industry

摘　　要：研究开发了一种工业场地铊和砷污染土壤修复技术。采用常见的氯化钾、氯化锰、氢氧化钾、膨胀珍珠岩和磷石膏,经过等温等离子体处理等一系列化学反应,制备了一种铁锰基混合粉的修复药剂,该药剂制备过程简单且具有强氧化性和强吸附性。实验结果表明,在修复时间为7 d,修复药剂中氯化锰与氯化铁物质的量比为3∶10,膨胀珍珠岩粉末与氯化铁锰固液比为25∶100,磷石膏与铁锰基混合粉质量比为3∶10的条件下,处理污染土壤,铊、砷的稳定效率分别达到99.21%和99.68%。此外,通过BCR法对土壤中铊、砷的形态分析显示,修复后土壤中铊、砷主要以残渣态存在,显著降低了其对环境的潜在危害。本研究为工业场地重金属污染土壤的修复提供了一种高效、环保的解决方案。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.

关 键 词：土壤修复 铊 砷 铁锰基混合粉 BCR法 

分 类 号：X53[环境科学与工程—环境工程]