Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 90, Issue 3, Pages 1119-1127Publisher
SPRINGER
DOI: 10.1007/s00253-011-3109-6
Keywords
Adsorption; Anaerobic sludge; Decolorization; Kinetics; Methyl orange (MO); Salt inhibition
Categories
Funding
- NSFC-JST [21021140001]
- National 863 Program of China [2009AA06Z305]
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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.
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