HR: 1340h
AN: H33H-1718    [Abstracts]
TI: Comprehensive Model for Enhanced Biodegradation of Chlorinated Solvents in Groundwater
AU: Kouznetsova, I
EM: irina.kouznetsova@ed.ac.uk
AF: University of Edinburgh, John Muir building, The King's Buildings, Edinburgh, EH9 3JL, United Kingdom
AU: * Gerhard, J I
EM: j.gerhard@ed.ac.uk
AF: University of Edinburgh, John Muir building, The King's Buildings, Edinburgh, EH9 3JL, United Kingdom
AU: Mao, X
EM: maoxiaomin@tsinghua.org.cn
AF: China Agricultural University, College of Water Conservancy and Engineering, Beijing, 100083, China
AU: Robinson, C
EM: clare.robinson@epfl.ch
AF: Ecole Polytechnique Federale de Lausanne, Laboratoire de technologie Ecologique, Lausanne, CH-1015, Switzerland
AU: Barry, A D
EM: andrew.barry@epfl.ch
AF: Ecole Polytechnique Federale de Lausanne, Laboratoire de technologie Ecologique, Lausanne, CH-1015, Switzerland
AU: Harkness, M
EM: harkness@crd.ge.com
AF: GE Global Research, One Research Circle, Niskayuna, NY 12309, United States
AU: Mack, E E
EM: elizabeth-erin.mack@usa.dupont.com
AF: DuPont Corporate Remediation Group, Glasgow 300, P.O. Box 6300, Newark, DE 19714- 6300, United States
AU: Dworatzek, S
EM: sdworatzek@siremlab.com
AF: SiREM, 130 Research Lane Suite 2, Guelph, ON N1G 5G3, Canada
AB: SABRE (Source Area BioREmediation) is a public/private consortium whose charter is to de-termine if enhanced anaerobic bioremediation can result in effective treatment of chlorinated solvent DNAPL source areas. The focus of this 4-year, $5.7 million research and development project is a field site in the United Kingdom containing TCE DNAPL. A comprehensive numerical model for simulating dehalogenation of chlorinated ethenes has been developed. The model considers the kinetic dissolution of DNAPL and nonaqueous organic amendments, bacterial growth and decay, and the interaction of biological and geochemical reactions that might influence biological activity. The model accounts for inhibitory effects of high chlorin-ated solvent concentrations as well as the link between fermentation and dehalogenation due to dynamic hydrogen concentration (the direct electron donor). In addition to the standard biodegradation pathways, sulphate reduction, mineral dissolution and precipitation kinetics are incorporated. These latter processes influence the soil buffering capacity and thus the net acidity generated. One-dimensional simulations were carried out to reproduce the data from columns packed with site soil and groundwater exhibiting both intermediate (250 mg/L) and near solubility (1100 mg/L) TCE concentrations. The modelling aims were to evaluate the key processes underpinning bioremediation success and provide a tool for investigating field sys-tem sensitivity to site data and design variables. This paper will present the model basis and validation and examine sensitivity to key processes including chlorinated ethene partitioning into soybean oil, sulphate reduction, and geochemical influences such as pH and the role of buffering in highly dechlorinating systems.
DE: 0418 Bioremediation
DE: 1831 Groundwater quality
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting