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Analysis of the rate-limiting step of an anaerobic biotrickling filter removing TCE vapors

Paper ID Volume ID Publish Year Pages File Format Full-Text
35784 45106 2010 7 PDF Available
Title
Analysis of the rate-limiting step of an anaerobic biotrickling filter removing TCE vapors
Abstract

A detailed analysis of a biotrickling filter treating trichloroethene (TCE) vapors anaerobically is presented and discussed. The biotrickling filter relies on mixed cultures containing bacteria from the genus Dehalococcoides that reductively dechlorinate TCE to ethene. After about 200 days of steady operation, as biomass in the packed bed increased, a partial loss in treatment performance was observed which prompted the present investigations. Analysis of TCE and of its degradation metabolites in the gas phase and in the trickling liquid combined with the calculation of global effectiveness factors revealed that significant mass transfer limitations existed. Depending on the conditions, either the gas film or the liquid film limited the removal of TCE. These findings were confirmed by the determination of gas and liquid films mass transfer coefficients. In all cases, removal of TCE was greater without trickling of liquid. The most plausible reason for the onset of mass transfer limitations was the decrease in the specific interfacial area brought by important biomass growth over time. Overall, this study illustrates how complex kinetic and transport limitations can vary with the operating conditions in biotrickling filters.

Keywords
Biotrickling filter; Biofilter; TCE; Mass transfer; Biodegradation
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Analysis of the rate-limiting step of an anaerobic biotrickling filter removing TCE vapors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 4, April 2010, Pages 549–555
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us