title: Heavy metal biosorption by biomass of Ochrobactrum anthropi producing exopolysaccharide in activated sludge.
abstract: The removal of chromium, cadmium and copper, toxic metals of high environmental priority due to their toxicity, from dilute aqueous solutions has been studied in the present work, applying a dead exopolysaccharide producing bacterium, Ochrobactrum anthropi, isolated from activated sludge. Particularly, the effect of pH, metal concentration and the effects of contact time were considered. Optimum adsorption pH values of chromium(VI), cadmium(II) and copper(II) were 2.0, 8.0 and 3.0 respectively. Experimental results also showed the influence of initial metal concentration on the metal uptake for dried biomass. Both the Freundlich and Langmuir adsorption models were suitable for describing the short-term biosorption of chromium(VI), cadmium(II) and copper(II) by O. anthropi.
authors.affiliation: Department of Biology, Faculty of Science, Ege University, Bornova, 35100 Izmir, Turkey. gozdemir@sci.ege.edu.tr
authors.forename: Guven
authors.initials: G
authors.lastname: Ozdemir
authors.forename: Tansel
authors.initials: T
authors.lastname: Ozturk
authors.forename: Nur
authors.initials: N
authors.lastname: Ceyhan
authors.forename: Rahim
authors.initials: R
authors.lastname: Isler
authors.forename: Tamer
authors.initials: T
authors.lastname: Cosar
mesh_terms: D000042:Absorption; D018533:Biomass; D002002:Brucella / Q000737:chemistry / Q000145:classification / Q000302:isolation & purification / Q000378:metabolism*; D002104:Cadmium / Q000493:pharmacokinetics; D002857:Chromium / Q000493:pharmacokinetics; D003300:Copper / Q000493:pharmacokinetics; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control; D019216:Metals, Heavy / Q000493:pharmacokinetics*; D008954:Models, Biological; D011135:Polysaccharides, Bacterial / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D011135:Polysaccharides, Bacterial; D012722:Sewage; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002857:Chromium; D003300:Copper