摘要
针对单一及混合表面活性剂对四氯乙烯(PCE)土壤污染的修复和淋溶机理进行研究,实验所用表面活性剂为SDS和Tween80。结果表明,混合表面活性剂的临界胶束浓度(CMC)随着溶液中Tween80含量的增加而降低。质量增溶比的规律为Tween 80>SDS>3∶1>1∶1>1∶3(SDS∶Tween 80),摩尔增溶比随Tween 80摩尔分数的增加而增大。采用沙柱模型考察表面活性剂淋溶效果的实验结果表明,表面活性剂对提高PCE的修复效果明显。对去除沙柱中PCE的影响顺序为:表面活性剂浓度>无机盐浓度>表面活性剂配比>冲洗液流速。冲洗效果最好的是3SDS∶1Tween 80。表面活性剂浓度和无机盐越高、冲洗流速越小,对PCE的冲洗去除效率越高。
Perchloroethylene (PCE) remediation and leaching behaviors had been examined using single and mixed surfactant, SDS and Tween 80. The experimental results showed that, with the content of the Tween80 increasing, the critical micelle concentration (CMC) of surfactant mixture reduced. Weight solubilization ratio (WSR) of surfactant followed the order of Tween 80>SDS>3:1>1:1>1:3 (SDS:Tween 80). Column flushing experiments showed that, PCE removal was significantly improved by surfactant solution compared with distilled water. The impact order for PCE removal was surfactant concentration > inorganic salt concentration > surfactant mass ratio > flow rate. 3SDS:1Tween 80 had the best removal impact. PCE flushing efficiency would be high when surfactant concentration and inorganic salt were high and flow rate was small.
出处
《科技通报》
北大核心
2016年第2期218-223,共6页
Bulletin of Science and Technology
关键词
表面活性剂
四氯乙烯
增溶作用
柱冲洗
surfactant
perchloroethylene
solubilization
column flushing
