title: Evaluation of integrated anaerobic-aerobic biofilm reactor for degradation of azo dye methyl orange.
abstract: This study was to investigate the mineralization of wastewater containing methyl orange (MO) in integrated anaerobic-aerobic biofilm reactor with coconut fiber as bio-material. Different aeration periods (3h in phase 1 and 2; 3, 6 and 15 h in phase 3; 24 h in phase 4 and 5) in aerobic chamber were studied with different MO concentration 50, 100, 200, 200 and 300 mg/L as influent from phase 1-5. The color removals estimated from the standard curve of dye versus optical density at its maximum absorption wavelength were 97%, 96%, 97%, 97%, and 96% and COD removals were 75%, 72%, 63%, 81%, and 73% in phase 1-5, respectively. The MO decolorization and COD degradation followed first-order kinetic model and second-order kinetic model, respectively. GC-MS analysis indicated the symmetrical cleavage of azo bond and the reduction in aromatic peak ensured the partial mineralization of MO.
authors.affiliation: School of Environmental Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia. murali_v123@yahoo.co.in
authors.forename: V
authors.initials: V
authors.lastname: Murali
authors.forename: Soon-An
authors.initials: SA
authors.lastname: Ong
authors.forename: Li-Ngee
authors.initials: LN
authors.lastname: Ho
authors.forename: Yee-Shian
authors.initials: YS
authors.lastname: Wong
mesh_terms: D001391:Azo Compounds / Q000378:metabolism*; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003116:Color; D007700:Kinetics
chemical_list: D001391:Azo Compounds; C100258:methyl orange
keywords: Biofilm; Color removal; Integrated anaerobic–aerobic; Kinetic model; Methyl orange