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Water Sci Technol

Title:		Biogas pre-upgrading by adsorption of trace compounds onto granular activated carbons and an activated carbon fiber-cloth
Author(s):		Boulinguiez B; Le Cloirec P;
Address:		"Ecole Nationale Superieure de Chimie de Rennes (ENSCR), UMR CNRS 6226-Sciences Chimiques de Rennes, Campus de Beaulieu, Avenue du General Leclerc, 35700, Rennes, France. benoit.boulinguiez@ensc-rennes.fr"
Journal Title:		Water Sci Technol
Year:		2009
Volume:		59
Issue:		5
Page Number:		935 - 944
DOI:		10.2166/wst.2009.070
ISSN/ISBN:		0273-1223 (Print) 0273-1223 (Linking)
Abstract:		"The study assesses the adsorption onto activated carbon materials of selected volatile organic compounds -VOCs- (dichloromethane, 2-propanol, toluene, siloxane D4) in a biogas matrix composed of methane and carbon dioxide (55:45 v/v). Three different adsorbents are tested, two of them are granular activated carbon (GAC), and the last is an activated carbon fiber-cloth (ACFC). The adsorption isotherm data are fitted by different models by nonlinear regression. The Langmuir-Freundlich model appears to be the adequate one to describe the adsorption phenomena independently of the VOC considered or the adsorbent. The adsorbents present attractive adsorption capacity of the undesirable compounds in biogas atmosphere though the maximum adsorption capacities for a VOC are quite different from each other. The adsorption kinetics are characterized through three coefficients: the initial adsorption coefficient, the external film mass transfer coefficient and the internal diffusion coefficient of Weber. The ACFC demonstrates advanced kinetic yields compared to the granular activated carbon materials whatever VOC is considered. Therefore, pre-upgrading of biogas produced from wastewater sludge or co-digestion system by adsorption onto activated carbon appears worth investigating. Especially with ACFC material that presents correct adsorption capacities toward VOCs and concrete regeneration process opportunity to realize such process"
Keywords:		Adsorption Carbon/*chemistry Gases/*analysis/chemistry/*metabolism Kinetics Molecular Structure Nonlinear Dynamics Trace Elements/*chemistry;
Notes:		"MedlineBoulinguiez, B Le Cloirec, P eng England 2009/03/11 Water Sci Technol. 2009; 59(5):935-44. doi: 10.2166/wst.2009.070"