Studies of Chromium Removal from Tannery Effluents by Dead Streptomyces Rimosus
Identifieur interne : 000758 ( Main/Exploration ); précédent : 000757; suivant : 000759Studies of Chromium Removal from Tannery Effluents by Dead Streptomyces Rimosus
Auteurs : Mohamed Nasser Sahmoune ; Krim Louhab ; Aissa BoukhiarSource :
- Chemical Product and Process Modeling [ 1934-2659 ] ; 2008-07-21.
Abstract
Dead streptomyces rimosus was found to be an effective biosorbent for the removal of chromium from industrial tanning effluents. A sorption level of 65 mg/g was observed at pH 4.8 while the precipitation effect augmented this value at a higher pH range. Chromium desorption increased with decreasing desorption agents pH (including HCl and H2SO4) to a maximum value of 95% at approximately zero pH. The biosorption data of trivalent chromium by streptomyces rimosus has been used for kinetic studies based on fractional power, Elovich, pseudo-first order and pseudo-second order rate expressions. The time-dependent Cr (III) biosorption data were well-described by a pseudo-second-order kinetic model. The intraparticle diffusion is not the rate-limiting step for the whole reaction. It was found that the biosorption equilibrium data fit well with the Langmuir model.
Url:
DOI: 10.2202/1934-2659.1209
Affiliations:
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