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J Environ Sci Health A Tox Hazard Subst Environ Eng

Title:		"Effect of switching gas inlet position on the performance of a polyurethane biofilter under transient loading for the removal of benzene, toluene and xylene mixtures"
Author(s):		Lee EH; Ryu HW; Cho KS;
Address:		"Department of Environmental Science and Engineering, Ewha Womans University, Seoul, Republic of Korea"
Journal Title:		J Environ Sci Health A Tox Hazard Subst Environ Eng
Year:		2011
Volume:		46
Issue:		13
Page Number:		1570 - 1578
DOI:		10.1080/10934529.2011.609444
ISSN/ISBN:		1532-4117 (Electronic) 1093-4529 (Linking)
Abstract:		"The performance of a polyurethane (PU) biofilter was evaluated using different operating modes (unidirectional flow (UF) and flow-directional switching (FDS) operations) under transient loading conditions (intermittent and shutdown). Gas mixtures containing benzene, toluene and xylene (BTX) were employed as model gases. Quantitative real-time PCR methods were used for targeting the tmoA gene responsible for BTX degradation and estimating density of the BTX-degraders in the PU filter bed. Although the overall BTX Removal efficiencies at the outlet (50 h(-1) of space velocity) were similar between the UF and FDS biofilters, the removability of BTX in the FDS biofilter was higher than that in the UF biofilter until the 3rd sampling position (68 h(-1) of space velocity). The BTX removal potentials and tmoA gene copy numbers of the FDS biofilter remained constant, irrespective of the distances from the inlet, but those of the UF biofilter increased with increasing distance from the inlet position. These results indicate that an even distribution of BTX degraders in the FDS filter bed contributed to better BTX removal performance. After a 10 day-shutdown, the performances of the UF and SDF biofilters were rapidly restored within 1 day"
Keywords:		"Air Pollutants/analysis/*isolation & purification Air Pollution/*prevention & control Bacteria/genetics/*metabolism Benzene/analysis/isolation & purification Chromatography, Gas DNA Copy Number Variations Filtration/*instrumentation/*methods Polyurethanes;"
Notes:		"MedlineLee, Eun-Hee Ryu, Hee Wook Cho, Kyung-Suk eng Comparative Study Research Support, Non-U.S. Gov't England 2011/10/28 J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011; 46(13):1570-8. doi: 10.1080/10934529.2011.609444"