水泥固化重金属污染土的淋滤特性试验研究  

EXPERIMENTAL STUDY OF LEACHING CHARACTERISTICS OF CEMENT SOLIDIFIED AND STABILIZED HEAVY METAL CONTAMINATED SOILS

作　　者：查甫生[1] 郝爱玲[1] 许龙[1] 刘晶晶[1] 崔可锐[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：《工业建筑》2014年第1期65-70,共6页Industrial Construction

基　　金：国家自然科学基金项目(41372281;41172273;40802079)

摘　　要：固化稳定法是目前处理重金属污染土场地的常用方法之一。经过处理后的污染土,不仅在强度上有所提高,而且重金属污染离子亦能被有效固化稳定下来。目前,这方面的研究成果主要集中在固化污染土的工程性质变化方面,而对固化土中的重金属离子的滤出特性研究较少。通过系统的室内试验,以经水泥固化后的铅和锌污染土为研究对象,着重研究固化污染土中重金属离子的淋滤特性。试验结果表明:水泥固化重金属污染土后,随着固化剂掺量和养护龄期的增加,重金属的滤出率显著降低,并最终趋于稳定。在污染物掺量较低时,水泥对Pb2+的固化效果好于对Zn2+的固化效果;随着污染物掺量的增加,滤出液中Pb2+浓度的增幅要大于Zn2+浓度增幅。在污染物掺量较高时,水泥对Zn2+的固化效果好于对Pb2+的固化效果。Solidification and stabilization method is widely used to deal with heavy metal contaminated soils. The strength and leaching characteristics of solidified soil can be significantly improved. A series of experiment programs were performed to study the leaching characteristics of lead and zinc contaminated soils solidified and stabilized by cement. The test results showed that with the increase of the cement and curing time, the leaching rate of contaminated ions was significantly reduced, and eventually became stable. At lower contaminant content, cement was better at dealing with Pb2＋ contaminated soils. With the increase of contaminant content, the leaching rate of Pb2＋ was larger than that of Zn2＋. Cement was better at dealing with Zn2＋ contaminated soils when the contaminant content was higher.

关 键 词：水泥 固化和稳定 重金属污染土 淋滤特性 

分 类 号：X53[环境科学与工程—环境工程]