Document Detail


Anaerobic biodegradability of Tween surfactants used as a carbon source for the microbial reductive dechlorination of hexachlorobenzene.
MedLine Citation:
PMID:  16180448     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
D H Yeh; S G Pavlostathis
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
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:
Created Date:  2005-09-26     Completed Date:  2005-11-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  343-9     Citation Subset:  IM    
Affiliation:
Department of Civil and Environmental Engineering, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620, USA. dhyeh@eng.usf.edu
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MeSH Terms
Descriptor/Qualifier:
Alkanesulfonic Acids / 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:
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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