title: Adsorption and decolorization kinetics of methyl orange by anaerobic sludge.
abstract: Adsorption and decolorization kinetics of methyl orange (MO) by anaerobic sludge in anaerobic sequencing batch reactors were investigated. The anaerobic sludge was found to have a saturated adsorption capacity of 36 ± 1 mg g MLSS(-1) to MO. UV/visible spectrophotometer and high-performance liquid chromatography analytical results indicated that the MO adsorption and decolorization occurred simultaneously in this system. This process at various substrate concentrations could be well simulated using a modified two-stage model with apparent pseudo first-order kinetics. Furthermore, a noncompetitive inhibition kinetic model was also developed to describe the MO decolorization process at high NaCl concentrations, and an inhibition constant of 3.67 g NaCl l(-1) was estimated. This study offers an insight into the adsorption and decolorization processes of azo dyes by anaerobic sludge and provides a better understanding of the anaerobic dye decolorization mechanisms.
authors.affiliation: School of Earth and Space Sciences and USTC-CityU Joint Advanced Research Centre, Suzhou 215123, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yu
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Li
authors.forename: Michael Hon-Wah
authors.initials: MH
authors.lastname: Lam
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism*; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004396:Coloring Agents / Q000737:chemistry* / Q000378:metabolism*; D007700:Kinetics; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D012722:Sewage; C100258:methyl orange