| Mesophilic and thermophilic BTEX substrate interactions for a toluene-acclimatized biofilter. | |
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MedLine Citation:
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PMID: 14666388 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Benzene, toluene, ethylbenzene and xylene (BTEX) substrate interactions for a mesophilic (25 degrees C) and thermophilic (50 degrees C) toluene-acclimatized composted pine bark biofilter were investigated. Toluene, benzene, ethylbenzene, o-xylene, m-xylene and p-xylene removal efficiencies, both individually and in paired mixtures with toluene (1:1 ratio), were determined at a total loading rate of 18.1 g m(-3) h(-1) and retention time ranges of 0.5-3.0 min and 0.6-3.8 min for mesophilic and thermophilic biofilters, respectively. Overall, toluene degradation rates under mesophilic conditions were superior to degradation rates of individual BEX compounds. With the exception of p-xylene, higher removal efficiencies were achieved for individual BEX compounds compared to toluene under thermophilic conditions. Overall BEX compound degradation under mesophilic conditions was ranked as ethylbenzene >benzene > o-xylene > m-xylene > p-xylene. Under thermophilic conditions overall BEX compound degradation was ranked as benzene > o-xylene >ethylbenzene > m-xylene > p-xylene. With the exception of o-xylene, the presence of toluene in paired mixtures with BEX compounds resulted in enhanced removal efficiencies of BEX compounds, under both mesophilic and thermophilic conditions. A substrate interaction index was calculated to compare removal efficiencies at a retention time of 0.8 min (50 s). A reduction in toluene removal efficiencies (negative interaction) in the presence of individual BEX compounds was observed under mesophilic conditions, while enhanced toluene removal efficiency was achieved in the presence of other BEX compounds, with the exception of p-xylene under thermophilic conditions. |
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Authors:
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J M Strauss; K J Riedel; C A Du Plessis |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2003-12-10 |
Journal Detail:
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Title: Applied microbiology and biotechnology Volume: 64 ISSN: 0175-7598 ISO Abbreviation: Appl. Microbiol. Biotechnol. Publication Date: 2004 Jun |
Date Detail:
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Created Date: 2004-05-28 Completed Date: 2004-12-16 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: 855-61 Citation Subset: IM |
Affiliation:
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School for Environmental Sciences and Development: Microbiology, Potchefstroom University for Christian Higher Education, Private Bag X6001, Potchefstroom 2520, South Africa. hannes.strauss@bhpbilliton.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria
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metabolism Benzene / chemistry, metabolism Benzene Derivatives / chemistry, metabolism Biodegradation, Environmental Bioreactors* Complex Mixtures / chemistry* Hydrocarbons, Aromatic / chemistry*, metabolism Pinus / microbiology Plant Bark / microbiology Temperature Toluene* / chemistry, metabolism Ultrafiltration Volatilization Xylenes / chemistry, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Benzene Derivatives; 0/Complex Mixtures; 0/Hydrocarbons, Aromatic; 0/Xylenes; 100-41-4/ethylbenzene; 108-88-3/Toluene; 71-43-2/Benzene |
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