title: Kinetic studies of reactive azo dye decolorization in anaerobic/aerobic sequencing batch reactors.
abstract: The decolorization kinetics of Remazol Brilliant Violet 5R (RBV-5R) and Remazol Black B (RB-B) (mono- and diazo reactive dyes, respectively) was investigated in the first 9 h (anaerobic phase) of a 24-h cycle anaerobic/aerobic sequencing batch reactor (SBR). Two distinct, successive decolorization periods were observed for both dyes, apparently due to different decolorization mechanisms. The apparent first-order rate constants were much lower for the second periods. First-order kinetics were apparently followed for both periods of RBV-5R but not for the first decolorization period of RB-B, possibly due to the occurrence of mass transfer limitations.
authors.affiliation: Centro de Engenharia Biológica e Química, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
authors.forename: Nídia D
authors.initials: ND
authors.lastname: Lourenço
authors.forename: Júlio M
authors.initials: JM
authors.lastname: Novais
authors.forename: Helena M
authors.initials: HM
authors.lastname: Pinheiro
mesh_terms: D001391:Azo Compounds / Q000494:pharmacology; D001420:Bacteria, Aerobic / Q000378:metabolism; D001421:Bacteria, Anaerobic / Q000378:metabolism; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000737:chemistry; D004396:Coloring Agents / Q000494:pharmacology*; D007220:Industrial Waste; D007700:Kinetics; D009282:Naphthalenesulfonates / Q000494:pharmacology*; D010100:Oxygen / Q000378:metabolism; D012722:Sewage; D013783:Textile Industry; D013784:Textiles; D014865:Waste Disposal, Fluid
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D009282:Naphthalenesulfonates; D012722:Sewage; C111247:C.I. Reactive Violet 5; D002244:Carbon; D010100:Oxygen