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Water Science & Technology Vol 65 No 12 pp 2258–2264 © IWA Publishing 2012 doi:10.2166/wst.2012.146 Synergetic degradation of Fe/Cu/C for groundwater polluted by trichloroethyleneWei Zhang, Li Li, Kuangfei Lin, Bang Xiong, Bingzhi Li, Shuguang Lu, Meijin Guo and Xinhong CuiState Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process / Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China E-mails: wzhang@ecust.edu.cn; kflin@ecust.edu.cnSchool of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China Shanghai Institute of Landscape Gardening, Shanghai 200233, China ABSTRACT This study investigated the enhancement of synergetic degradation of Fe/Cu/C (Fe: commercial iron, Cu: solid product of Fe reacted with CuSO4, C: carbon powder) for simulated groundwater contaminated by trichloroethylene (TCE). Zero valent iron (ZVI) as a reducing agent was proved to be effective for TCE removal. The Fe/Cu/C system resulted in higher reduction efficiency as a result of the synergetic role of Fe/Cu and Fe/C microelectrode than the Fe (ZVI) or Fe/Cu system, and the half-life was only about 0.4 h. When m(Fe) achieved 12.5 g L–1, the residual concentration of TCE almost leveled off. Fe:Cu = 10:1 or m(C) = 0.0086 g can induce the optimum function for TCE degradation. A neutral condition was appropriate for TCE degradation, and an acidic system slightly favored TCE dechlorination compared with an alkaline system. GC/MS analysis indicated that TCE was dechlorinated to 1,1-dichloroethene (1,1-DCE), cis-1,2-dichloroethene (cis-DCE) and vinyl chloride (VC), and 1,1-DCE might be the precursor. Fe/Cu/C reduction is a highly promising technique for TCE removal, and it is an excellent alternative to enhance TCE reductive dechlorination. Keywords: Fe/Cu/C system; synergetic degradation; trichloroethylene; zero valent iron eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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