Chemical Compatibility of CMC-Treated Bentonite Under Heavy Metal Contaminants and Landfill Leachate

摘要：

　　Carboxymethyle cellulose(CMC)is considered to enhance the chemical compatibility of bentonite in terms of hydraulic conductivity.In this study,a series of modified fluid loss(MFL)tests is conducted to investigate the hydraulic conductivity(k)of CMC-treated bentonite when exposed to heavy metal contaminant and landfill leachate.CMC content in bentonite is set at 0%(i.e.,untreated bentontie)and 10%(i.e.,CMC-treated).Lead-zinc nitrate mixture is selected as representative heavy metal contaminants; and calcium chloride is also used for comparison.Total metal concentrations of the chemical liquid ranged from 0 to 20 mmol/L.The result indicated that minimal change in k of CMC-bentonite is found from the MFL test; whereas the k value of untreated bentonite significantly increased with increased Pb-Zn and Ca concentration.The k value of untreated bentonite is approximately 20 times higher than that of CMC-treated bentonite for a given void ratio.In addition,it is found that the impact of landfill leachate on the hydraulic conductivity is insignificant for CMC-treated bentonite.The k of CMC-treated bentonite considerably lower than that of untreated bentonite when exposed to the leachate.

关键词： Bentonite Carboxymethyle cellulose Heavy metal Landfill leachate Hydraulic conductivity

作者: R.-D.Fan S.-Y.Liu Y.-J.Du Krishna R.Reddy Y.-L.Yang

作者单位: Institute of Geotechnical Engineering,Southeast University,Nanjing,China;Jiangsu Key Laboratory of U Department of Civil and Materials Engineering,University of Illinois at Chicago,Chicago,IL 60607,USA

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 421-429

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）