Adsorption and biological decolourization of azo dye Reactive Red 2 in semicontinuous anaerobic reactors

摘要: Abstract The microbial decolourization of Reactive Red 2 (RR2) dye has been studied under anaerobic conditions. Three semicontinuous bioreactors were operated with concentrations—R1 (control: 0 mg RR2 l−1), R2 (100 mg RR2 l−1) and R3 (200 mg RR2 l−1). parameters monitored were, oxidation–reduction potential (ORP), methane production, colour chemical oxygen demand (COD) removal during the feeding cycles. values for first few days above −150 mV, which later on decreased to less than −275 mV in all reactors. Colour operation was due adsorption biomass. However, steady state conditions, 76% both containing reactors it biologically mediated degradation. Methane production control almost same. Integrated analysis indicated that, primary mechanism RR2 biomass subsequent Decolourization rates found be order respect concentration, although an increase influent concentration resulted a decrease rate from 0.0074 (g volatile suspended solid, VSS)−1 h−1 0.0039 Based total no inhibition effect dyes observed but methanogenic activity (TMA) results exhibited methanogenesis.