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Appl Microbiol Biotechnol

Title:		Abatement of odorant compounds in one- and two-phase biotrickling filters under steady and transient conditions
Author(s):		Lebrero R; Rodriguez E; Perez R; Garcia-Encina PA; Munoz R;
Address:		"Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain"
Journal Title:		Appl Microbiol Biotechnol
Year:		2013
Volume:		20120717
Issue:		10
Page Number:		4627 - 4638
DOI:		10.1007/s00253-012-4247-1
ISSN/ISBN:		1432-0614 (Electronic) 0175-7598 (Linking)
Abstract:		"The removal of hydrophobic volatile organic compounds (VOCs) still remains the main restriction in the biological treatment of odorous emissions due to mass transfer limitations. The addition of a non-aqueous phase to conventional biotrickling filters (BTF) may overcome this limitation by enhancing VOCs transport from the gas to the microorganisms. This study compared the long-term and transient performance of a one- (1P) and two-liquid phase (2P; with silicone oil as non-aqueous phase) BTFs for the removal of four VOCs (butanone, toluene, alpha-pinene, and hexane) at empty bed residence times (EBRT) ranging from 47 to 6 s. Removal efficiencies (RE) >96 % were obtained for butanone, toluene, and alpha-pinene in both bioreactors regardless of the EBRT, while higher hexane REs were recorded in the 2P-BTF (81-92 %) compared to the 1P-BTF (60-97 %). The two-phase system always showed a more consistent performance, being able to better withstand step VOC concentration increases and starvation periods, although it was more affected by liquid recycling shutdowns due to a reduced VOC mass transfer. The analysis of the microbial communities showed a high biodiversity and richness despite the low C source spectrum and high community evenness and richness. In this context, the presence of silicone oil mediated the development of a highly different phylogenetic composition of the communities"
Keywords:		Bioreactors *Odorants Volatile Organic Compounds/*isolation & purification;
Notes:		"MedlineLebrero, Raquel Rodriguez, Elisa Perez, Rebeca Garcia-Encina, Pedro A Munoz, Raul eng Research Support, Non-U.S. Gov't Germany 2012/07/18 Appl Microbiol Biotechnol. 2013 May; 97(10):4627-38. doi: 10.1007/s00253-012-4247-1. Epub 2012 Jul 17"