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Select record Successful implementation of aerobic cometabolism of vinyl chloride via an in situ biofilter.

Author(s) : Johnson, C. D.; Truex, M. J.; Leigh, D. P.; Granade, S. Author Affiliation : Battelle Pacific Northwest Division, Richland, Washington, USA. Author Email : [email protected] Editors : Magar, V. S.; Kelley, M. E. Book chapter; Conference paper : In situ and on-site bioremediation - 2003. Proceedings of the Seventh International In Situ and On-Site Bioremediation Symposium, Orlando, Florida, USA, 2-5 June, 2003 2004 pp.A43 ref.14 Conference Title : Seventh International In Situ and On-Site Bioremediation Symposium, Orlando, Florida, USA, 2-5 June 2003. Part A. Bioremediation of Halogenated Compounds. Abstract : Prior work at Naval Base Ventura County, Point Mugu used anaerobic in situ bioremediation to achieve volumetric treatment of a trichloroethene/dichloroethene (TCE/DCE) plume in groundwater with high sulfate concentrations (approximately 700 mg/L). Complete dechlorination of TCE and DCE was achieved rapidly but the vinyl chloride (VC) intermediate was degraded at a very slow rate, resulting in a VC plume that persisted after the anaerobic treatment. To accelerate treatment of this residual VC, a novel treatment strategy was implemented using aerobic cometabolism. Treatment cells with 4 extraction wells surrounding a central injection well were operated in a pulsed injection flow strategy. Methane and oxygen were injected with contaminated water to create an in situ biofilter zone around the injection well. Process operations consisted of a methane/oxygen distribution stage with a high groundwater recirculation flow rate and a reaction stage where the recirculation flow was stopped. This strategy was configured to optimize the cometabolic methanotrophic reaction by addressing the need to efficiently distribute methane and oxygen within the in situ biofilter, allow for growth of methanotrophs, and minimize methane inhibition of VC destruction. Initial operations with a single treatment cell successfully demonstrated VC destruction with this in situ biofilter pulsed injection strategy. The system was then expanded to include three treatment cells operated on a rotating cycle. The configuration of the three cells was designed using reactive transport modelling with the objective of treating the entire VC plume remaining from the original anaerobic bioremediation treatment of TCE and DCE. ISBN : 1574771396 Record Number : 20043104304 Publisher : Battelle Press Location of publication : Colombus Country of publication : USA Language of text : English Indexing terms for this abstract:

Descriptor(s) : aerobic treatment, biodegradation, bioremediation, groundwater, groundwater pollution, methane, models, oxygen, polluted water, pollution control, sulfate, water quality Identifier(s) : biofilters, dechlorination, dichloroethene, trichloroethene, vinyl chloride, water composition and quality, United States of America Geographical Location(s) : USA, California Broader term(s) : APEC countries, high income countries, North America, America, OECD Countries, very high Human Development Index countries, Pacific States of USA, Western States of USA, USA