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Effect of Surfactant on Reductive Dechlorination of Trichloroethylene by Zero-Valent Iron  

Shin, Min-Chul (Department of Environment Engineering, Kumoh National Institute of Technology)
Choi, Hyun-Dock (Department of Environment Engineering, Kumoh National Institute of Technology)
Yang, Jung-Seok (KIST Gangneung Institute)
Baek, Ki-Tae (Department of Environment Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.6, 2007 , pp. 38-45 More about this Journal
Abstract
Trichloroethylene (TCE) is a representative dense non-aqueous phase liquid (DNAPL) and has contaminated substance environments including soil and groundwater due to leakage and careless. DNPAL, has been treated by surfactant-enhanced aquifer remediation (SEAR). After application of SEAR, groundwater contains still surfactant as well as little amount of residual TCE. Permeable reactive barrier using zero-valent iron (ZW) is a very effective technology to treat the residual TCE in groundwater. In this study, the effect of the residual surfactant on the reductive dechlorination of residual TCE was investigated using ZVI. Mixed surfactant composed of nonioinic surfactant and cationic surfactant was used as a residual surfactant because of toxicity and enhancement of dechlorination rate. Structure of surfactant affected significantly the decrhlorination rate of TCE. Mixed surfactant system with relatively short polyethylene oxide (PEO) chain in nonionic surfactant, cationic surfactant did not affect TCE dechlorination rate. However, mixed surfactant system with relatively long PEO chain in nonionic surfactant shows that TCE dechlorination rate was significantly dependent on fraction of cationic surfactant and HLB of nonionic surfactant. Cationic surfactant with trimethyl ammonium group enhanced reductive dechlorination rate compared to that surfactant with pyridinium group.
Keywords
Trichloroethylene; Mixed surfactant; Zero-valent iron; Reductive dechlorination; TCE;
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