几种常用还原剂在铬污染土壤中的应用探讨

Application of Several Common Reducing Agents in Chromium Contaminated Soil

以化学还原法修复铬污染土壤为基础,介绍了土壤中铬的来源、存在形态及其转化方式,重点分析了纳米零价铁、硫化亚铁、硫酸亚铁、焦亚硫酸钠、硫代硫酸钠、硫化钠、多硫化钙以及有机酸在铬污染土壤修复中的应用及其研究进展,对所列还原剂的优缺点及应用现状进行了总结和评价。工程应用应综合考虑还原效率、经济成本以及操作安全等因素,选择合适的修复方法,以达到土壤修复的目的。针对土壤原位修复易造成二次污染、土壤结构破坏、生物活性降低的特点,对铬污染土壤修复的未来发展提出展望与方向。

Based on the remediation of chrome-polluted soil by chemical reduction method,the sources,existing forms and transformation modes of chromium in soil were introduced.The application and research progress of nano zero valence iron,ferrous sulfide,ferrous sulfate,sodium metabisulfite,sodium thiosulfate,sodium sulfide,calcium polysulfide and organic acids in the remediation of chromium contaminated soil were emphatically analyzed.The advantages,disadvantages and application status of reducing agent are summarized and evaluated.In engineering application,factors such as reduction efficiency,economic cost and operation safety should be considered comprehensively,and appropriate remediation methods should be selected to achieve the purpose of soil remediation.In view of the characteristics of soil in-situ remediation,which is easy to cause secondary pollution,soil structure damage and biological activity reduction,the prospect and direction of soil remediation were put forward.