NDLI: Effect of directional switching frequency on toluene degradation in a vapor-phase bioreactor

Content Provider	Springer Nature Link
Author	Song, J. Kinney, K.
Copyright Year	2001
Abstract	A potential method to improve biomass distribution and the stability of vapor-phase bioreactors is to operate them in a directionally switching mode such that the contaminant air stream direction is periodically reversed through the reactor. In this study, the effect of switching frequency (SF) on bioreactor performance and biodegradation activity was investigated at 1-, 3- and 7-day SFs using toluene as a model compound. Rapid losses of biodegradation capacity and serious bioreactor instability were observed in the bioreactor operated at a 1-day SF. It is hypothesized that the frequent dynamic loading conditions at the 1-day SF hindered biofilm development and ultimately bioreactor stability. In contrast, bioreactors operated at the 3- and 7-day SFs achieved overall removal efficiencies of greater than 99% for 72 and 59 days of operation, respectively. Following each air-stream reversal, the bioreactor operated at the 7-day SF required 48 h to fully restore biodegradation capacity in the inlet bioreactor section. The 1-day SF bioreactor required no such reacclimation period. The toluene-degrading activity in the inlet section of the 7-day SF bioreactor dropped by 71% during the 7-day cycle, whereas it decreased by only 11% in the inlet of the 3-day SF bioreactor. These declines suggest that continuous or near-continuous exposure to toluene can inhibit microbial activity. Of the three SFs examined, the 3-day SF yielded the most efficient bioreactor performance by balancing reacclimation requirements with biodegradation activity losses.
Starting Page	108
Ending Page	113
Page Count	6
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	56
Issue Number	1-2
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-05-18
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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