“…However, since these aromatic amines are more toxic than the dye itself, they are further degraded aerobically in the second stage [10]. The literature survey on biodegradation of the dye wastewater showed that many different type of anaerobic reactor configurations like sequential batch reactor (SBR) [11], fluidized beds [12], upflow anaerobic sludge blanket reactor (UASB) [13], rotating biological contactor (RBC) [14], and fixed/packed bed reactor [15] have been used for treatment of synthetic dyestuffs and high decolorization and degradation efficiencies were obtained. It was also concluded that the use of two-stage anaerobic-aerobic conditions could allow complete mineralisation of these xenobiotic azo-compounds.…”