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Water Res

Title:		H2S and VOCs abatement robustness in biofilters and air diffusion bioreactors: A comparative study
Author(s):		Lebrero R; Rodriguez E; Martin M; Garcia-Encina PA; Munoz R;
Address:		"Department of Chemical Engineering and Environmental Technology, University of Valladolid, Paseo del Prado de la Magdalena s/n, 47011 Valladolid, Spain"
Journal Title:		Water Res
Year:		2010
Volume:		44
Issue:		13
Page Number:		3905 - 3914
DOI:		10.1016/j.watres.2010.05.008
ISSN/ISBN:		1879-2448 (Electronic) 0043-1354 (Linking)
Abstract:		"The robustness of a conventional biofilter and an air diffusion bioreactor (ADB) was comparatively evaluated in laboratory-scale plants treating a mixture of H2S, butanone, toluene and alpha-pinene at gas residence times of 50 s. Under steady state conditions, H2S, butanone and toluene were almost completely degraded, while alpha-pinene removal did not exhibit removal efficiencies (REs) higher than 11.0 +/- 2.3%. Fluctuations in temperature from 8 degrees C to 30 degrees C did not impact significantly process performance in any of the biotechnologies tested. However, while the ADB unit was able to cope with three and six fold step increases in pollutant loadings, volatile organic compounds (VOCs) REs noticeably decreased in the biofilter when subjected to a six fold step change (i.e. 90% reduction for butanone and 30% for toluene). A process shutdown of five days resulted in the temporary loss of butanone and toluene RE in the ADB system. A lack of irrigation during five days caused a slight decrease in the biofilter REs, while a failure in the pH control system drastically affected the ADB performance. Finally, process robustness was quantified. The calculated overall risks showed that both biotechnologies were reliable for H2S and VOCs treatment in wastewater treatment plants, ADB diffusion exhibiting a higher robustness towards fluctuations commonly found under routine operation. This robustness was further confirmed by the high stability of the DGGE profiles"
Keywords:		"Air/*analysis Bacteria/genetics/growth & development *Bioreactors/microbiology Diffusion Electrophoresis, Agar Gel Filtration/*instrumentation Hydrogen Sulfide/*analysis Hydrogen-Ion Concentration Odorants/analysis Organic Chemicals/*analysis RNA, Ribosom;"
Notes:		"MedlineLebrero, Raquel Rodriguez, Elisa Martin, Maria Garcia-Encina, Pedro A Munoz, Raul eng Comparative Study Research Support, Non-U.S. Gov't England 2010/07/20 Water Res. 2010 Jul; 44(13):3905-14. doi: 10.1016/j.watres.2010.05.008"