混合洗脱剂对土壤中重金属和多氯联苯的同步高效洗脱  

Simultaneously elution of heavy metals and polychlorinated biphenyls in soils by mixed eluent

作　　者：廖侃[1] 党志[1,2] 屈璐[1] 郭楚玲[1,2] 卢桂宁[1,2] 

机构地区：[1]华南理工大学环境与能源学院,广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广州510006

出　　处：《环境工程学报》2016年第8期4539-4546,共8页Chinese Journal of Environmental Engineering

基　　金：国家高技术研究发展计划(863)项目(2012AA06A203);广东省科技计划项目(2014A020216004);教育部新世纪优秀人才支持计划项目(NCET-12-0199);广东省教育厅科技创新项目(2013KJCX0015)

摘　　要：针对电子垃圾拆解、焚烧场地周边污染土壤中的重金属和疏水性有机物的复合污染问题,对重金属和有机物同步高效洗脱方法进行了研究。将皂素、吐温-80和柠檬酸按照不同浓度配比组合并制成混合洗脱剂,采用批量平衡振荡的方法,研究其对Cu、Pb、Cd和多氯联苯(PCBs)复合污染土壤的洗脱效果,以及浓度配比、p H和洗脱时间对洗脱效果的影响,并找出最优的洗脱条件。结果表明:在混合洗脱剂中皂素、吐温-80和柠檬酸的浓度分别为12、10和5 g·L^(-1),p H值为5,批量平衡振荡洗脱时间为6 h的条件下,洗脱效果最佳,对Cu、Pb、Cd和PCBs的洗脱率分别为88.32%、82.75%、94.89%和80.56%,实现了复合污染土壤中重金属和疏水性有机物的同步高效洗脱。A study was conducted to provide effective,efficient solutions to the problems of soils co-contaminated with heavy metals and hydrophobic organics,near sites for dismantling and incinerating electronic waste. Saponin,Tween-80,and citric acid were used as mixed eluents at different concentration ratios. These were applied using the method of batch oscillation,to examine the elution effect on Cu,Pb,Cd,and PCBs in the co-contaminated soils by the mixed eluent,as well as to determine the influence of different factors such as concentration ratio,p H,and elution time. It was found that the elution reached its best condition when the ratio of saponin,Tween-80,and citric acid in the mixed eluent were 12,10,and 5 g·L^-1with p H 5. 0,and 6 h of elution. The elution rates of Cu,Pb,Cd,and PCBs,were 88. 32%,82. 75%,94. 89%,and 80. 56%,respectively. This achieved the efficient,simultaneous elution of heavy metals and hydrophobic organics in the cocontaminated soils.

关 键 词：复合污染土壤 重金属 多氯联苯 混合洗脱剂 同步洗脱 

分 类 号：X53[环境科学与工程—环境工程]