溶剂萃取去除模拟土壤淋洗液中DNAPLs  被引量:7

Removal of DNAPLs from Simulated Soil Flushing by Solvent Extraction

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作  者:朱瑞佳[1] 赵保卫[1] 吴咏琪[1] 马婵媛[1] 

机构地区:[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出  处:《兰州交通大学学报》2008年第3期51-54,共4页Journal of Lanzhou Jiaotong University

基  金:国家自然科学基金资助项目(20577018);甘肃省中青年科技基金资助项目(3ZS042-B25-023);兰州交通大学"青蓝"人才工程基金资助项目

摘  要:研究了液-液萃取去除模拟土壤淋洗液中的重非水相液体(Dense nonaqueous phase liquids,DNAPLs)的可行性及表面活性剂浓度、溶剂/水比例和无机盐等因素对去除率的影响.结果表明,利用正己烷作为溶剂可使氯苯从十二烷基硫酸钠(Sodium dodecyl sulfate,SDS)和失水山梨聚氧乙烯醇醚(Ethoxylated anhydrosorbitol esters,Tween80)溶液中有效的去除,去除率分别达91.2%~94.9%和88.1%~94.6%,表面活性剂浓度对去除效果没有显著影响;溶剂/水比例增大,去除率增大,实验中选择油水比为0.1;无机盐的存在对去除效果没有影响,但高浓度的无机盐可使阴离子表面活性剂发生沉淀,造成表面活性剂损失.The feasibility of removing DNAPLs from simulation soil flushing by liquid-liquid extraction is studied together with the effects of surfactant concentration, rations of solvent to water and inorganic salts on the removal rates. The results showed that n-hexane as solvent could effectively remove chlorobenzene from SDS and Tween80 solutions,and the removal rates were 91.2%-94. 9% and 88. 1%-94. 6%,and it also concluded that removal rate was not changed with the surfactant concentrations, but enhanced along with the rations of solvent to water enhancement. Therefore the experiment adopted the rate of oil and water(o/w) was 0.1. It was found that the effects of inorganic salts on removal rates were negligible,but the inorganic salts with high concentrations could result in the precipitation and loss of anionic surfactant.

关 键 词:表面活性剂 正己烷 萃取DNAPLs 

分 类 号:X131[环境科学与工程—环境科学]

 

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