title: Cadmium and lead adsorption by a natural polysaccharide in MF membrane reactor: experimental analysis and modelling.
abstract: In the present work, Pb(2+) and Cd(2+) adsorption onto a natural polysaccharide has been studied in membrane reactors. The process involves a stirred semi-batch reactor for the adsorption step and a microfiltration (MF) process in order to confine the particles. Due to their lower affinity for the biosorbent, Cd(2+) ions were found to breakthrough the process faster than Pb(2+) cations. The experimental results showed the technical feasibility of the pilot. A mass balance model based on the Langmuir equilibrium isotherm was used to describe the adsorption process. This relation is able to predict experimental data under different operating conditions: the adsorbent and metal concentrations, and the permeate flow rate. Based on these results, it is demonstrated that the biosorbent studied represents an interesting low-cost solution for the treatment of metal ions polluted waters.
authors.affiliation: Ecole des Mines de Nantes, GEPEA, UMR CNRS 6144, 4 rue Alfred Kastler, BP 20722, 44307 Nantes Cedex 3, France.
authors.forename: Zacaria
authors.initials: Z
authors.lastname: Reddad
authors.forename: Claire
authors.initials: C
authors.lastname: Gérente
authors.forename: Yves
authors.initials: Y
authors.lastname: Andrès
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Thibault
authors.forename: Pierre
authors.initials: P
authors.lastname: Le Cloirec
mesh_terms: D019149:Bioreactors; D002104:Cadmium / Q000737:chemistry* / Q000302:isolation & purification*; D005374:Filtration; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification*; D008567:Membranes, Artificial; D008962:Models, Theoretical; D011134:Polysaccharides / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D008567:Membranes, Artificial; D011134:Polysaccharides; D002104:Cadmium; D007854:Lead