Tsai T T, Kao C M, Yeh T Y, Liang S H, Chien H Y
Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
J Hazard Mater. 2009 Jan 15;161(1):111-9. doi: 10.1016/j.jhazmat.2008.03.061. Epub 2008 Mar 21.
The industrial solvent trichloroethylene (TCE) is among the most ubiquitous chlorinated solvents found in groundwater contamination. The main objectives of this study were to evaluate the feasibility of using non-ionic surfactant Simple Green (SG) to enhance the oxidative dechlorination of TCE by potassium permanganate (KMnO4) employing a continuous stir batch reactor system (CSBR) and column experiments. The effect of using surfactant SG to enhance the biodegradation of TCE via aerobic cometabolism was also examined. Results from CSBR experiments revealed that combination of KMnO4 with surfactant SG significantly enhanced contaminant removal, particularly when the surfactant SG concentrated at its CMC. TCE degradation rates ranged from 74.1% to 85.7% without addition of surfactant SG while TCE degradation rates increased to ranging from 83.8% to 96.3% with presence of 0.1wt% SG. Furthermore, results from column experiments showed that TCE was degraded from 38.1microM to 6.2microM in equivalent to 83.7% of TCE oxidation during first 560min reaction. This study has also demonstrated that the addition of surfactant SG is a feasible method to enhance bioremediation efficiency for TCE contaminated groundwater. The complete TCE degradation was detected after 75 days of incubation with both 0.01 and 0.1wt% of surfactant SG addition. Results revealed that surfactant enhanced chemical oxidation and bioremediation technology is one of feasible approaches to clean up TCE contaminated groundwater.
工业溶剂三氯乙烯（TCE）是地下水中最常见的氯化溶剂之一。本研究的主要目的是评估使用非离子表面活性剂“易洁”（SG）通过连续搅拌间歇式反应器系统（CSBR）和柱实验来增强高锰酸钾（KMnO₄）对TCE的氧化脱氯的可行性。还研究了使用表面活性剂SG通过好氧共代谢增强TCE生物降解的效果。CSBR实验结果表明，KMnO₄与表面活性剂SG的组合显著提高了污染物的去除率，特别是当表面活性剂SG浓度达到其临界胶束浓度时。在不添加表面活性剂SG的情况下，TCE降解率在74.1%至85.7%之间，而在存在0.1wt% SG的情况下，TCE降解率提高到83.8%至96.3%之间。此外，柱实验结果表明，在最初560分钟的反应中，TCE从38.1微摩尔降解至6.2微摩尔，相当于TCE氧化的83.7%。本研究还表明，添加表面活性剂SG是提高受TCE污染地下水生物修复效率的一种可行方法。在添加0.01wt%和0.1wt%表面活性剂SG孵育75天后检测到TCE完全降解。结果表明，表面活性剂强化化学氧化和生物修复技术是清理受TCE污染地下水的可行方法之一。
