DOI: 10.5176/2251-189X_SEES29

Authors: Chalathip Juntalasiri & Benjaporn Boonchayaanant

Abstract: This study investigates the decolorization of two mono-azo dyes, C.I. Acid Red 18 and C.I. Acid Orange 7in two anaerobic baffled reactors (ABRs) under sulfate-reducing conditions. Lactate and sulfate with the COD:sulfate ratio of ~0.6 were used to stimulate the growth of sulfate-reducing bacteria in the reactors. Sulfate was the main electron acceptor in both reactors and sulfate-reducing conditions were successfully developed. The results show that both C.I. Acid Red 18 and C.I. Acid Orange 7were decolorized effectively in the ABRs under sulfate-reducing conditions with the decolorization efficiencies of 97.8 ± 1.4 {6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} and 98.3 ± 1.7{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}, respectively.

Keywords: decolorization, azo dyes, anaerobic baffled reactors, sulfate, anaerobic conditions

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