Journal
CHEMICAL ENGINEERING JOURNAL
Volume 223, Issue -, Pages 611-616Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.03.031
Keywords
Direct Red 80; Sulfate reducing bacteria; Degradation; Anaerobic; Kinetic model
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [KRF-2008-313-D00554, 2010-0023442]
- Brain Korea 21 Program
- Priority Research Centers Program through an NRF
- MEST [2010-0028301]
- National Research Foundation of Korea [2010-0023442] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The degradation, kinetics and biotransformation of Direct Red 80 and chemical oxygen demand (COD) were examined under a sulfate reducing environment. Complete color and sulfate removal with more than 87% COD removal were obtained in the batch experiments at different dye (50-800 mg/l) and sulfate (100-5000 mg/l) concentrations. Dye degradation, COD and sulfate removal followed first order kinetics. An increase in dye concentration from 0 to 800 mg L-1 decreased the rate constant (k(1)) for dye, COD and sulfate removal from 0.0843 to 0.035 h(-1), 0.019 to 0.009 h(-1) and 0.108 to 0.075 h(-1), respectively. In particular, the sulfate concentration had no significant effect on dye degradation. Unlike other anaerobic cultures, the sulfate-reducing bacteria culture showed excellent dye mineralization and desulfonation ability. Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry revealed aniline and 1,4-diamino benzene to be the resulting metabolites after the decolorization of Direct Red 80. (C) 2013 Elsevier B.V. All rights reserved.
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