镉污染土壤淋洗修复技术研究  

Research on leaching technology for cadmium contaminated soil

作　　者：秦会敏[1] 郦和生[1] 谢文州[1] 胡永丰 QIN Huimin;LI Hesheng;XIE Wenzhou;HU Yongfeng(Sinopec(Beijing)Research Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013

出　　处：《化工环保》2024年第2期230-234,共5页Environmental Protection of Chemical Industry

摘　　要：采用振荡淋洗法处理Cd污染土壤。考察了不同淋洗剂对污染土壤中Cd的去除效果,以及淋洗剂浓度、淋洗剂pH、淋洗剂体积与土壤质量比(液土比)等条件对淋洗效果的影响。采用Tessier分步提取法对淋洗前后的Cd形态分布进行分析,并对淋洗废液的再生利用情况进行了研究。实验结果表明:乙二胺四乙酸二钠(EDTANa_(2))是高效的Cd污染土壤淋洗剂,当EDTA-Na_(2)浓度为0.03 mol/L、淋洗剂pH为3、液土比为4:1时,Cd去除率可达73.27%;土壤中Cd的主要去除形态为可交换态;采用新型二硫代羧酸功能化树枝状聚合物(DPETACSSNa)对淋洗废液进行再生,再生后淋洗液的Cd去除性能基本不变。The cadmium contaminated soil was treated by shaking leaching method.The removal effect of different eluents on cadmium in contaminated soil,and the effects of eluent concentration,eluent pH,ratio of eluent volume to soil mass(liquid-soil ratio)were investigated.The distribution of cadmium forms before and after leaching was analyzed by Tessier sequential extraction method,and the recycling of waste leaching liquid was studied.The results indicate that:Edathamil disodium(EDTA-Na_(2))is an effective eluent for Cd contaminated soil,and when the EDTANa_(2)concentration is 0.03 mol/L,eluent pH is 3,and the liquid-soil ratio is 4∶1,the Cd removal rate can reach 73.27%;The major form of removed Cd is exchangeable speciation;The waste leaching liquid can be regenerated by dithiocarboxylic acid functionalized dendritic polymer(DPETA-CSSNa),and the Cd removal capability of the regenerated eluent is almost unchanged.

关 键 词：乙二胺四乙酸二钠(EDTA-Na_(2)) 淋洗 再生 镉 金属形态 土壤修复 

分 类 号：X5[环境科学与工程—环境工程]