重金属工业污染场地固化/稳定处理研究进展

Review of stabilization/solidification technique for remediation of heavy metals contaminated lands

目前在发达国家,固化/稳定处理技术已被广泛应用在重金属工业污染场地的修复工程中,而在国内则不多见。通过文献回顾,对重金属-土-胶结物的相互作用机制进行了综述,对比了各种标准淋滤试验参数,总结了国内外对固化重金属污染土性能的评价标准。同时论述了固化污染土的无侧限抗压强度的影响因素,并归纳了有关固化污染土溶出特性、耐久性及长期性状的国内外研究成果。针对国内已有研究现状,建议在制定国内重金属工业污染土修复技术标准时,需要明确固化污染土的最小强度要求,并制定相应的动态和半动态淋滤试验规范。

Recently, stabilization/solidification of heavy metals contaminated soils （HMCS） using lime, cement, and other binders has been widely adopted in geoenvironmental engineering practice. In this paper, the mechanisms of heavy metal-soil-binder interaction are overviewed based on literature studies. The performance of various leaching test standards for solidified I-IMCS is compared and discussed. The unconfined compression strength properties and influencing factors of solidified/stabilized heavy metal contaminated soils are also presented. The leaching properties, durability and long-term performance of HMCS from domestic and international studies are summarized. Finally, based on the current studies in China, it is suggested that the minimum strength requirement of HMCS should be given; and test specification of dynamic leaching tests should be built as the assessment criteria of contaminated lands remediation.