Study of Intrinsic Bioremediation at a Gas Condensate Contaminated Site

摘要

The investigations at the BPU-2 site strongly support the hypothesis of intrinsic bioremediation of gas condensate hydrocarbons. The geochemical data indicate that the BTEX plume is stable and anaerobic and that there is a net decrease in the soil BTEX suggesting that subsurface biodegradation is occurring. This conclusion is corroborated by the detection of tell-tale microbial metabolites in the groundwater; microcosm studies to document biodegradation of known metabolic intermediates of hydrocarbon biodegradation and significant enrichment in the populations of sulfate reducing bacteria and methanogens in the contaminated zone. The observations also point to the importance of aerobic biodegradation, sulfate reduction, iron reduction and methanogenesis in the subsurface.