Effect of chlorinated ethenes on Smin for a methanotrophic mixed culture

Article Abstract:

Chlorinated aliphatic hydrocarbons (CAHs) appear to increase the minimum methane concentration for net growth (Smin) of a methanotrophic mixed culture. The presence of either 0.05 mg/L 1,1-dichloroethylene (1,1-DCE), 2 mg/L trans-1-2-dichloroethylene (t-DCE) or 4 mg/L trichloroethylene (TCE) can cause Smin to increase from 5 microng/L to 20-25microng/L methane. Several factors that allow CAHs to increase Smin may include reducing energy limitation, competitive inhibition, and transformation product toxicity.

Crude Petroleum and Natural Gas Extraction, Crude petroleum and natural gas, Chlorinated Hydrocarbons, Natural Gas, Well Produced, Models, Natural gas, Methane, Chlorocarbons, Hydrocarbon research

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Small-column microcosm for assessing methane-stimulated vinyl chloride transformation samples in aquifer samples

Article Abstract:

Small-column microcosms based on 15 ml test tubes filled with aquifer material and installed with a fluid exchange system were used for evaluating the potential for in-situ vinyl chloride biotransformation using a methane-stimulated culture. The results showed that the microcosms performed reasonably well and that the small sample size did not hinder their ability for precise analysis.

Aquifers

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Methanotrophic chloroethene transformation capacities and 1,1-dichloroethene transformation product toxicity

Article Abstract:

Chloroethene, a chloride monomer, is widely present in the environment as a groundwater contaminant. It can undergo dehalogenation under anaerobic conditions to form vinyl chloride and methanotrophic oxidation to form toxic chloroethene epoxides. Aqueous batch tests were used to determine the transformation capacity of five chloroethenes.

Vinyl Chloride Monomer

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