电动力学技术修复苯酚污染土壤的研究  

Study on electrokinetic remediation of phenol-polluted soil

作　　者：李丽[1] 朱琨[1] 张兴[1] 孙晋方[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：《环境污染与防治》2008年第11期35-39,44,共6页Environmental Pollution & Control

基　　金：甘肃省自然科学基金资助项目(No.3ZS061-A25-025)

摘　　要：用电动力学技术对苯酚污染砂土的修复进行了实验研究。探讨了苯酚污染砂土电动力学修复的可行性及在不同电场强度下苯酚的迁移特征和机制。研究了采用添加阴离子表面活性剂十二烷基苯磺酸钠(LAS)和控制液(柠檬酸和NaOH)等对迁移效果的影响,以及苯酚在砂土中的迁移和分布规律。实验结果表明,在电场作用下苯酚在砂土中发生富集。在电场强度为2.0V/cm时的苯酚富集效果明显,比在电场强度为0.5V/cm时苯酚多增加30%,且向阳极的迁移距离增大了12cm;在阴极添加不同浓度的LAS,苯酚在砂土中的富集效果不同,LAS浓度越大向阳极迁移得越快富集效果越明显,当LAS为0.0460mol/L时苯酚最高增加了143%;向阳极添加NaOH,苯酚在阳极区增加了136%,比向阴极添加柠檬酸的效果明显。The experimental study on the electrokinetic remediation of phenol-polluted sand soil was performed at the laboratory. The remediation feasibility of phenol-polluted sand soil by electrokinetie technology was investigated. The characteristic of migration and mechanism of phenol in different electrical potential gradient, and the effects of migration and distribution by using LAS and acid-buse buffering were discussed. The results showed that phenol was accumulated in the sand soil. It was obviously when the electrical potential gradient was 2.0 V/cm, increasing by 30% over the electrical potential gradient was 0.5 V/cm, and the distance to cathode increased 12 cm. The accumulation of phenol was different in soil, when adding LAS in cathode of different concentration, as the concentration of LAS was 0. 046 0 mol/L, the hightest accumulation efficiency increased by 143 %; The phenol increased by 136 % in anode when adding NaOH, and it was obviously than adding citric acid in cathode.

关 键 词：苯酚 土壤污染 电动力学修复 电场强度 

分 类 号：X53[环境科学与工程—环境工程] TQ243.12[化学工程—有机化工]