title: Influence of the physicochemical properties of inorganic supports on the activity of immobilized bacteria for water denitrification.
abstract: The denitrification of polluted water was studied by using supported E-coli bacteria. The physicochemical characteristics of supports and the influence of these properties on the bacteria performance were analyzed. Inorganic supports oxides and zeolites were selected in order to cover a wide range of porosity and surface chemical properties and the denitrification process systematically studied. Consecutive denitrification cycles in batch experiments and the toxicity of supports were also analyzed. The acidity of supports provokes a slower reduction processes, favoring also a high concentration of intermediate nitrites in solution for longer periods. The NO3(-) reduction is faster than the NO2(-) one, being also less influenced by the support characteristics. Anyway, the total denitrification is reached in all cases. The best performance was obtained with bacteria supported on mesoporous and non-acid silica support.
authors.affiliation: Departament of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18003 Granada, Spain.
authors.forename: M I
authors.initials: MI
authors.lastname: Bautista-Toledo
authors.affiliation: Departament of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18003 Granada, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Espinosa-Iglesias
authors.affiliation: Departament of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18003 Granada, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Carrasco-Marín
authors.affiliation: Departament of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18003 Granada, Spain.
authors.forename: A F
authors.initials: AF
authors.lastname: Pérez-Cadenas
authors.affiliation: Departament of Inorganic Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18003 Granada, Spain. Electronic address: fjmaldon@ugr.es.
authors.forename: F J
authors.initials: FJ
authors.lastname: Maldonado-Hódar
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D001419:Bacteria / Q000378:metabolism*; D018914:Cells, Immobilized; D058440:Denitrification; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism*; D010087:Oxides / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D017641:Zeolites
chemical_list: D009573:Nitrites; D010087:Oxides; D014874:Water Pollutants, Chemical; D017641:Zeolites; C009495:titanium dioxide; D014025:Titanium; D000537:Aluminum Oxide
keywords: Bacteria; Inorganic supports; Porosity; Surface chemistry; Toxicity; Water denitrification