Design and Performance of a Toluene-Degrading Differential Biotrickling Filter as an Alternative Research Tool to Column Reactors
Publication: Journal of Environmental Engineering
Volume 147, Issue 3
Abstract
A differential biotrickling filter (DBTF) was developed as a research tool to minimize radial and longitudinal gradients, which hinder analysis in integral (column) reactors. The main design modifications were a very high gas recycle rate and a low, uniform liquid addition rate via an aerosol generator. The elimination capacity (EC), uniformity of biofilm formation, and long-term reliability of the reactor were evaluated. The maximum toluene elimination capacity was approximately , which was higher than the EC in most previous reports. The high EC potentially was due to the thin liquid film over the biofilm generated by low liquid trickling rates. Moreover, the high gas recycle rate (2.5–100 times the feed flow rate) allowed uniform substrate and nutrients distribution throughout the bed hence promoting favorable growth and performance of the microbes. These findings can serve as a guide in improving performance of industrial biotrickling filters. Substrate inhibition was observed at loading rates (LRs) higher than . Despite operational issues that affected its long-term reliability, such as (1) unwanted growth of microbes on the pipes and in the aerosol reservoir, (2) a decline in the performance of the aerosol generator, and (3) limited fan capacity, the DBTF is a promising tool that can improve biofiltration research.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Journal of Environmental Engineering
Volume 147 • Issue 3 • March 2021
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© 2020 American Society of Civil Engineers.
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Received: Aug 17, 2020
Accepted: Oct 19, 2020
Published online: Dec 26, 2020
Published in print: Mar 1, 2021
Discussion open until: May 26, 2021
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