The effect of salt on the one stage combined anaerobic-aerobic processes for the treatment of synthetic wastewater containing Reactive Red 195
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1Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic)
2Department of Chemical Engineering,Amirkabir University of Technology (Tehran Polytechnic) Tehran, Iran
3Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
In this study, the effect of NaCl at different concentrations in the range 0-100 g/l on the performance of a one stage anaerobic-aerobic process for treatment of a synthetic wastewater containing Reactive Red 195 (RR195) was investigated. Preliminary studies suggested that 72 hours was the optimum period for anaerobic reduction of RR195, and the adaption of activated sludge with the dye was done in the one-stage anaerobic-aerobic cycles. At the end of each stage, the degradation of azo dye with 100 mg/l as the initial concentration of dye was examined with the various concentration of NaCl. The results showed a statistical enhancement of the anaerobic decolorization efficiency for NaCl concentration up to 60 g/l. However, for concentrations higher than 60 g/l, adding NaCl had an opposite effect effect and led to a decrease in anaerobic reduction of RR195.