砷、锑污染场地污染调查及修复方案设计

Investigation and Design of Remediation Scheme of Arsenic and Antimony Contaminated Sites

文章对某砷、锑污染场地项目场地环境调查、小试试验、修复方案设计进行了介绍,通过场地调查和风险评估确定了本场地的污染物为砷和锑,修复工程方量近30万m^(3)。经过方案比选,本场地最适合的修复技术为原地固化稳定化修复技术。通过小试试验可知,对于高浸出污染风险土壤建议添加2%的粉末离子矿化稳定剂,对于低浸出污染风险土壤,建议添加0.5%的广谱性重金属稳定化药剂,处理后的土壤浸出浓度满足相关要求后进行原地异位阻隔回填。最终制定了场地的修复方案,可为同类重金属污染场地修复设计提供借鉴和参考。

This paper introduces the site environmental investigation,pilot test and remediation plan design of a site contaminated by arsenic and antimony.Through site investigation and risk assessment,arsenic and antimony were identified as the pollutants in this site,and the amount of restoration works was nearly 30,000.After the scheme selection,the most suitable repair technology for this site is in situ solidification and stabilization repair technology.Through the pilot test,it is suggested to add 2%powder ion mineralization stabilizer to the soil contaminated by high leaching risk,which can meet the restoration target requirements of the project.For contaminated soil with low leaching pollution,it is recommended to add broad-spectrum heavy metal stabilization agents to reduce the leaching concentration and avoid excessive leaching.After the soil leaching concentration met the relevant requirements,the in-situ ectopic barrier backfill was carried out.Finally,the restoration scheme of the site can provide reference for the restoration design of similar heavy metal contaminated sites.