Document Detail


Comparative study of methanol, butyrate, and hydrogen as electron donors for long-term dechlorination of tetrachloroethene in mixed anerobic cultures.
MedLine Citation:
PMID:  16007584     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study examined the ability of different electron donors (i.e., hydrogen, methanol, butyrate, and yeast extract) to sustain long-term (500 days) reductive dechlorination of tetrachloroethene (PCE) in anerobic fill-and-draw bioreactors operated at 3:1 donor:PCE ratio (defined on a total-oxidation basis for the donor). Initially (i.e., until approximately day 80), the H(2)-fed bioreactor showed the best ability to completely dechlorinate the dosed PCE (0.5 mmol/L) to ethene whereas, in the presence of methanol, butyric acid or no electron donor added (but low-level yeast extract), dechlorination was limited by the fermentation of the organic substrates and in turn by H(2) availability. As the study progressed, the H(2)-fed reactor experienced a diminishing ability to dechlorinate, while more stable dechlorinating activity was maintained in the reactors that were fed organic donors. The initial diminished ability of the H(2)-fed reactor to dechlorinate (after about 100 days), could be partially explained in terms of increased competition for H(2) between dechlorinators and methanogens, whereas other factors such as growth-factor limitation and/or accumulation of toxic and/or inhibitory metabolites were shown to play a role for longer incubation periods (over 500 days). In spite of decreasing activity with time, the H(2)-fed reactor proved to be the most effective in PCE dechlorination: after about 500 days, more than 65% of the added PCE was dechlorinated to ethene in the H(2)-fed reactor, versus 36%, 22%, and <1% in the methanol-fed, butyrate-fed, and control reactors, respectively.
Authors:
Federico Aulenta; James M Gossett; Marco Petrangeli Papini; Simona Rossetti; Mauro Majone
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  91     ISSN:  0006-3592     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-08-29     Completed Date:  2005-11-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  743-53     Citation Subset:  IM    
Copyright Information:
(c) 2005 Wiley Periodicals, Inc.
Affiliation:
Department of Chemistry, University of Rome La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.
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MeSH Terms
Descriptor/Qualifier:
Anaerobiosis
Bioreactors
Butyrates / chemistry,  metabolism*
Chlorine / chemistry
Electrons
Hydrogen / chemistry,  metabolism*
Industrial Microbiology / methods*
Kinetics
Methanol / chemistry,  metabolism*
Trichloroethylene / chemistry*
Chemical
Reg. No./Substance:
0/Butyrates; 1333-74-0/Hydrogen; 67-56-1/Methanol; 7782-50-5/Chlorine; 79-01-6/Trichloroethylene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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