Abstract
A series of laboratory scale “microcosm” studies were undertaken to study the rates of biological (biotic) and non-biological (abiotic) dechlorination of chlorinated hydrocarbon solvents such as trichloroethylene (TCE). Microcosms were seeded with subsurface sediment samples drawn from a contaminated paint manufacturing facility in continental Europe, and incubated under a variety of anaerobic conditions to determine TCE removal rates by cometabolic oxidation, biological reductive dechlorination, and non-biological reductive dechlorination catalysed by supplementary additions of zero-valent Iron. Control microcosms conducted in parallel included incubations in the absence of sediments, and in the presence of sediments previously sterilised by autoclaving. TCE was added at an initial concentration of 6 mg/1 in all microcosms, together with methanol as a supplementary carbon source.
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