| Anaerobic biodegradability of Tween surfactants used as a carbon source for the microbial reductive dechlorination of hexachlorobenzene. | |
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MedLine Citation:
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PMID: 16180448 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Three structurally-related, nonionic, polysorbate surfactants (Tween 60, 61, and 65) were used as the sole carbon source to sustain the microbial, sequential reductive dechlorination of hexachlorobenzene (HCB) in a mixed, methanogenic culture derived from a contaminated estuarine sediment. The surfactants were partially degraded and fermented to methane with no measurable accumulation of volatile fatty acids, indicating that methanogenesis was rapid relative to the rates of hydrolysis and acidogenesis. Addition of the methanogenesis inhibitor 2-bromoethanesulfonic acid resulted in acetate accumulation without impact on the sequential dechlorination of HCB. An anaerobic biodegradability assay was performed and the following data were obtained for the Tween 60, 61, and 65, respectively: 53, 62, and 62% COD destruction; 35, 57, and 48% COD to methane conversion; and 38, 38, and 45% COD to acetate conversion. These data suggest that the hydrophobic moiety (stearate) of the surfactants was preferentially degraded, most likely through beta-oxidation, to acetate and ultimately to methane and carbon dioxide. Between 38 and 47% of the initial surfactant COD remained after 46 d incubation, which most likely corresponds to the hydrophilic polyoxyethylene moiety. An anaerobic biodegradation pathway of the Tween surfactants is proposed. |
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Authors:
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D H Yeh; S G Pavlostathis |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Water science and technology : a journal of the International Association on Water Pollution Research Volume: 52 ISSN: 0273-1223 ISO Abbreviation: Water Sci. Technol. Publication Date: 2005 |
Date Detail:
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Created Date: 2005-09-26 Completed Date: 2005-11-08 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9879497 Medline TA: Water Sci Technol Country: England |
Other Details:
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Languages: eng Pagination: 343-9 Citation Subset: IM |
Affiliation:
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Department of Civil and Environmental Engineering, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620, USA. dhyeh@eng.usf.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Alkanesulfonic Acids
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pharmacology Bacteria, Anaerobic / metabolism* Biodegradation, Environmental Carbon / metabolism Chlorine / chemistry Enzyme Inhibitors / pharmacology Hexachlorobenzene / metabolism* Methane / metabolism Oxidation-Reduction Polysorbates / metabolism* Sodium Azide / pharmacology Soil Pollutants / metabolism Surface-Active Agents / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Alkanesulfonic Acids; 0/Enzyme Inhibitors; 0/Polysorbates; 0/Soil Pollutants; 0/Surface-Active Agents; 118-74-1/Hexachlorobenzene; 26628-22-8/Sodium Azide; 26978-65-4/2-bromoethanesulfonic acid; 74-82-8/Methane; 7440-44-0/Carbon; 7782-50-5/Chlorine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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