Coupling of zero valent iron and biobarriers for remediation of
trichloroethylene in groundwater |
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Authors: | Mullika Teerakun Alissara Reungsang Chien-Jung Lin and Chih-Hsiang Liao |
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Institution: | 1. Department of Biotechnology, Khon Kaen University, Khon Kaen 40002, Thailand 2. Department of Biotechnology, Khon Kaen University, Khon Kaen 40002, Thailand;National Center of Excellence for Environmental and Hazardous Waste Management (EHWM), Bangkok 10330, Thailand;Research Center for Environmental and Hazardous Substance Management, Khon Kaen University,A. Muang, Khon Kaen 40002, Thailand 3. Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science,Tainan 71710, Taiwan, China 4. Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science,Tainan 71710, Taiwan, China |
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Abstract: | This study attempted to construct a three series barrier system to treat high concentrations of trichloroethylene (TCE; 500 mg/L) in
synthetic groundwater. The system consisted of three reactive barriers using iron fillings as an iron-based barrier in the first column,
sugarcane bagasse mixed with anaerobic sludge as an anaerobic barrier in the second column, and a biofilm coated on oxygen carbon
inducer releasing material as an aerobic barrier in the third column. In order to evaluate the extent of removal of TCE and its metabolites
in the aquifer down gradient of the barrier system, a fourth column filled with sand was applied. Residence time of the system was
investigated by a bromide tracer test. The results showed that residence time in the column system of the control set and experimental
set were 23.62 and 29.99 days, respectively. The e ciency of the three series barrier system in removing TCE was approximately
84% in which the removal e ciency of TCE by the iron filling barrier, anaerobic barrier and aerobic barrier were 42%, 16% and 25%,
respectively. cis-Dichloroethylene (cis-DCE), vinyl chloride (VC), ethylene and chloride ions were observed as metabolites following
TCE degradation. The presence of chloride ions in the e uent from the column system indicated the degradation of TCE. However,
cis-DCE and VC were not fully degraded by the proposed barrier system which suggested that another remediation technology after
the barrier treatment such as air sparging and adsorption by activated carbon should be conducted. |
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Keywords: | iron filling biobarrier remediation permeable reactive barriers trichloroethylene |
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