Biodegradation kinetics of carbon tetrachloride by Pseudomonas cepacia under varying oxidation–reduction potential conditions
In recent years, considerable interest has been given to the in situ degradation of hazardous contaminants by stimulating indigenous microorganisms. Optimization of environmental conditions, especially oxidation–reduction potential (ORP), for metabolism of hazardous constituents by indigenous microorganisms may assist in cost-effective mitigation by enhanced bioremediation.Pseudomonas cepacia, the predominant species, was selected as the microorganism of study to evaluate ORP effects on biodegradation of carbon tetrachloride (CT), a common contaminant in many sites. Titanium (III) citrate was used as a reducing agent to poise ORP at desired levels. Results indicate that initial ORP appears to be critical for initiating the CT degradation process. Substantial CT degradation occurred when cultures were poised at negative ORP conditions, while negligible CT removal was observed at oxidative ORP conditions. Accumulation of chloroform (CF) produced by CT metabolism was not observed, which may be attributed to its metabolism by P. cepacia and another pathway that preclude CF generation. The maximum biodegradation rate was found to occur at approximately −150 mv2 and an overall substrate removal rate constant, K. of 6.9 × 10−3 h−1 was observed at an initial CT concentration of 323 μg/L.
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Document Type: Research Article
Publication date: 1997-09-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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