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Received January 29, 2007
Accepted May 16, 2007
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Effect of co-substrate on anaerobic slurry phase bioremediation of TNT-contaminated soil

Department of Soil and Groundwater, Environmental Management Corporation, Environmental Research Complex, Incheon 404-708, Korea 1Department of Environmental Disaster Prevention Engineering, Kangwon National University, Kangwon-do 245-711, Korea 2Konkuk University Innovative Environmental Technology Center, Konkuk University, Seoul 143-701, Korea 3Environment Department, Byucksan Engineering Co. Ltd., Seoul 150-010, Korea 4Department of Health and Environment, Hallym College, Kangwon-do 200-711, Korea
wan5155@kangwon.ac.kr
Korean Journal of Chemical Engineering, January 2008, 25(1), 102-107(6), 10.1007/s11814-008-0018-1
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Abstract

Molasses and starch were used to estimate the effect of co-substrate on anaerobic slurry phase bioremediation of TNT (2,4,6-trinitrotoluene)-contaminated soil. Degradation efficiency of TNT in molasses and starch addition was approximately 97% and 87%, which is 50-60% higher than 38% without co-substrate addition. Molasses and starch addition enhanced TNT degradation. It was proved that the TNT degradation was a mainly biological process from the result of an abiotic control experiment. In case of molasses addition, overall first order degradation rate was 0.0161/day indicating the most active TNT degradation. The first order degradation rates (k1=0.0056 for molasses, k1=0.0033/day for starch) before 60 days were slower than those thereafter (k2=0.0237 for molasses, k2=0.0136/day for starch). Lower degradation rate in early stage might be due to adaptation of native soil microorganisms.

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