| Dechlorination of polychlorinated methanes by a sequential methanogenic-denitrifying bioreactor system. | |
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MedLine Citation:
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PMID: 10803908 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A two-stage bioreactor has been developed to link dechlorination of halogenated methane compounds to the anaerobic processes of methanogenesis and denitrification. A digester methanogenic consortium was shown to dechlorinate chloroform (CF) and carbon tetrachloride (CT) to dichloromethane (DCM), and DCM was then mineralized by an acclimated denitrifying biological activated carbon consortium. Combining these two processes, a sequential methanogenic-denitrifying bioreactor (SMDB) system that completely degraded polychlorinated methanes including CT, CF, and DCM was developed. More than 95% of the added CT and CF was dechlorinated in the methanogenic bioreactor with methanol as the primary substrate, and the resultant DCM was biodegraded in the denitrifying bioreactor with nitrate as the electron acceptor. In the denitrifying bioreactor, the residual CF was completely removed, and the DCM removal efficiency was more than 95%. This novel bioreactor system eliminates the need for aeration and so avoids the air contamination associated with aerobic biotreatment of volatile chlorinated pollutants. This SMDB system provides an alternative to conventional biotreatment of wastewaters and other matrices contaminated with polychlorinated methanes and is, to our knowledge, the first report on such a sequential anoxic system. |
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Authors:
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Z Yu; G B Smith |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Applied microbiology and biotechnology Volume: 53 ISSN: 0175-7598 ISO Abbreviation: Appl. Microbiol. Biotechnol. Publication Date: 2000 Apr |
Date Detail:
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Created Date: 2000-06-30 Completed Date: 2000-06-30 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8406612 Medline TA: Appl Microbiol Biotechnol Country: GERMANY |
Other Details:
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Languages: eng Pagination: 484-9 Citation Subset: IM |
Affiliation:
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Department of Biology and Molecular Biology Program, New Mexico State University, Las Cruces 88003, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria
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genetics,
metabolism* Biodegradation, Environmental Bioreactors* Carbon Tetrachloride / metabolism Chloroform / metabolism Culture Media Euryarchaeota / metabolism* Methane / metabolism* Methylene Chloride / metabolism Nitrates / metabolism* Water Pollutants, Chemical / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Culture Media; 0/Nitrates; 0/Water Pollutants, Chemical; 56-23-5/Carbon Tetrachloride; 67-66-3/Chloroform; 74-82-8/Methane; 75-09-2/Methylene Chloride |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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