重金属污染场地固化/稳定化修复技术研究及工程实践

Research on Remediation of Heavy Metal-contaminated Soil by Solidification/Stabilization and Engineering Practice

本文在采集上海某化工区污染场地土壤进行污染物分析的基础上,针对其污染物为重金属的特点,提出采用固化/稳定化的工艺进行修复处理。研究固化/稳定化药剂的添加比例对固化体强度和固化体浸出毒性的影响,从而得出较优的工艺条件,修复后固化体浸出毒性满足地表水环境质量IV级标准,固化体强度大于2 MPa,可用于场地路基材料。在实验的基础上,进行工程实践,开展免烧砖的工艺制备,实现污染土壤的资源化利用。

Based on the analysis of contamination in contaminated site soil from a Shanghai chemical industry zone, for which the characteristics of heavy metal pollutants, this article proposes the solidification/stabilization technology to remediation. According to the added ratio of solidification/stabilization agents which has an impact on extraction toxicity of solidification and strength of solidification, the optimum process conditions can be got. After the treatment, the extraction toxicity of solidification meets the environmental quality of surface water Class IV standards, and strength of solidification is greater than 2 MPa, so it can be used in roadbed material. On the basis of experiments,engineering practice and preparation process of unbaked bricks can be carried out to achieve the resource utilization of contaminated soil.