title: Effect of heavy metal co-contaminants on selenite bioreduction by anaerobic granular sludge.
abstract: This study investigated bioreduction of selenite by anaerobic granular sludge in the presence of heavy metals and analyzed the fate of the bioreduced selenium and the heavy metals. Selenite bioreduction was not significantly inhibited in the presence of Pb(II) and Zn(II). More than 92% of 79 mg/L selenite was removed by bioreduction even in the presence of 150 mg/L of Pb(II) or 400mg/L of Zn(II). In contrast, only 65-48% selenite was bioreduced in the presence of 150-400 mg/L Cd(II). Formation of elemental selenium or selenide varied with heavy metal type and concentration. Notably, the majority of the bioreduced selenium (70-90% in the presence of Pb and Zn, 50-70% in the presence of Cd) and heavy metals (80-90% of Pb and Zn, 60-80% of Cd) were associated with the granular sludge. The results have implications in the treatment of selenium wastewaters and biogenesis of metal selenides.
authors.affiliation: Environmental Engineering and Water Technology Department, UNESCO-IHE, Delft, The Netherlands; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
authors.forename: J
authors.initials: J
authors.lastname: Mal
authors.affiliation: Environmental Engineering and Water Technology Department, UNESCO-IHE, Delft, The Netherlands; Biofouling and Biofilm Processes Section, Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India. Electronic address: venkatany@gmail.com.
authors.forename: Y V
authors.initials: YV
authors.lastname: Nancharaiah
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
authors.forename: E D
authors.initials: ED
authors.lastname: van Hullebusch
authors.affiliation: Environmental Engineering and Water Technology Department, UNESCO-IHE, Delft, The Netherlands; Department of Chemistry and Bioengineering, Tampere University of Technology, P.O-Box 541, Tampere, Finland.
authors.forename: P N L
authors.initials: PNL
authors.lastname: Lens
mesh_terms: D019216:Metals, Heavy / Q000633:toxicity*; D010084:Oxidation-Reduction / Q000187:drug effects; D020887:Selenious Acid / Q000378:metabolism*; D012643:Selenium; D012722:Sewage
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D020887:Selenious Acid; D012643:Selenium
keywords: Anaerobic granular sludge; Biosorption; Heavy metal removal; Metal selenide; Selenite bioreduction