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Toluene mass transfer characterization in a biotrickling filter

Paper ID Volume ID Publish Year Pages File Format Full-Text
3659 181 2012 6 PDF Available
Title
Toluene mass transfer characterization in a biotrickling filter
Abstract

Biotrickling filters (BTFs) devoted to air pollution control often present mass transfer limitations for hydrophobic volatile organic compounds (VOCs). Under such limiting conditions, BTF design and scale-up should be based on mass transfer data. A general and simple model was developed to characterize the VOC transfer by means of the overall mass transfer coefficient (KLa). The KLa values were obtained by fitting the model to experimental data of toluene absorption obtained at empty bed residence times (EBRT) from 7 to 50 s. The model fitted well the experimental data (r2 = 0.97) and the resulting KLa values ranged from 35 to 113 h−1. These values are similar to those reported in the literature for BTF despite the lower liquid recycling velocity here used (0.6 m h−1). A critical gas-to-liquid flow rate ratio (QG/QL) of 200, above which KLa was poorly increased, was observed. In addition, the individual film coefficients were estimated from the Van Krevelen and Hoftijzer correlations, which revealed that the main resistance for toluene mass transfer was in the liquid film regardless of the EBRT used. Finally, the high mass transfer potential of BTFs was confirmed by estimating the mass transfer capacity under varied operating conditions.

► A general and simple model to characterize the VOC mass transfer in biotrickling filters by means of the overall mass transfer coefficient (KLa) was developed. ► The resulting KLa values ranged from 35 to 113 h−1. A critical gas-to-liquid flow rate ratio of 200, above which KLa was poorly increased, was observed. ► The estimation of the individual film coefficients revealed that the main resistance for mass transfer was in the liquid film. ► The calculated mass transfer capacity confirmed the high mass transfer potential of biotrickling filters.

Keywords
Biological off-gas treatment; Biotrickling filter; Mass transfer modeling; Toluene; Volatile organic compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 60, 15 January 2012, Pages 44–49
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