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Progress in Biomass and Bioenergy Production Part 7

Tham khảo tài liệu 'progress in biomass and bioenergy production part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Biosorption of Metals State of the Art General Features and Potential Applications for Environmental and Technological Processes 169 Fig. 8. Modeling of breakthrough curve in the column biosorption of La III for Sargassum sp. biomass by the Thomas model. Symbols data of metal concentration on eluate and curve fit for Thomas model. Source Oliveira 2011. 6.2 Dependence of the operational parameters There is broad literature that describes the effects of operational parameters to augment and to improve the biosorption in fixed-bed columns Chu 2004 Hashim Chu 2004 Kratochvil Volesky 2000 Naddafi et al. 2007 Oliveira 2007 Oliveira 2001 Valdman et al. 2001 Vieira et al. 2008 Vijayaraghavan et al. 2005 Vijayaraghavan et al. 2008 Vijay ar aghavan Prabu 2006 Volesky et al. 2003 . These parameters modified mainly related are flow rate feeding concentration height of packed-bed column porosity mass of biomass etc. Vijayaraghavan Prabu 2006 evaluate some variables as the bed height 15 to 25 cm flow rate 5 to 20 mL min and copper concentration 50 to 100 mg L in Sargassum wightii biomass from breakthrough curves each variable evaluated was changed and the others were fixed. Continuous experiments revealed that the increasing of the bed height and inlet solute concentration resulted in better column performance while the lowest flow rate favored the biosorption Vijayaraghavan Prabu 2006 Naddafi et al. 2007 studied the biosorption of binary solution of lead and cadmium in Sargassum glaucescens biomass from the breakthrough curves modeled according with the Thomas model eq. 7 . Under selected flow rate condition 1.5 L h the experiments reached a selective biosorption. The elution of the metals in distinct breakthrough times with biosorption uptake in these times at 0.97 and 0.15 mmol g for lead and cadmium respectively. 6.3 Desorption chromatographic elution and biomass reuse Column desorption is used for the metal recovery but this procedure under selected conditions may be .