碱渣固化铅污染土淋滤特性试验研究  

Leaching properties of lead contaminated soils treated by soda residue

作　　者：刘晶晶[1] 查甫生[1] 王连斌[1] 张雪芹[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《东南大学学报（自然科学版）》2016年第A01期94-98,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41330641;41272311)

摘　　要：以人工制备的铅污染土为研究对象,选用碱渣作为固化剂,利用毒性浸出试验(Toxicity characteristic leaching procedure)评价了碱渣固化/稳定铅污染土的修复效果.通过分析Pb2+初始浓度、碱渣掺量及养护龄期对浸出液中Pb2+质量浓度及pH值的影响,探讨了碱渣固化土体中Pb2+的滤出特性.试验结果表明,增加土体中Pb2+含量可导致Pb2+滤出质量浓度增大,而增加碱渣掺量和养护龄期可有效降低浸出液中Pb2+质量浓度.此外,浸出液pH值的变化主要受碱渣掺量和养护龄期的影响.Toxicity characteristic leaching procedure （TCLP） was conducted in the artificial pre- pared Pb-contaminated soils treated by soda residue to assess the effectiveness of stabilization/solidification. By analyzing the effects of the initial Pb^2＋ concentration, soda residue content and curing time on the leached Pb^2＋ mass concentration and pH value of the leachate, the leaching properties of Pb^2＋ immobilization were discussed. The test results indicate that the leached Pb^2＋ mass concentration increases with the increase of initial Pb^2＋ concentration of the soils. And increasing the soda residue content and curing time can effectively reduce the leached Pb^2＋ mass concentration. Otherwise, the variations of pH values of the leached solutions are mainly controlled by soda residue content and curing time.

关 键 词：铅污染土 碱渣 毒性浸出试验 固化/稳定法 

分 类 号：X705[环境科学与工程—环境工程]