Abstract
AbstractFactorial design and response surface methodology were employed to investigate the effects of substrate (500–3,000 mg/L) and riboflavin (1–150 μM) concentrations on the chemical oxygen demand (COD) and color removal with biogranules in the treatment of textile effluent using sequential anaerobic–aerobic batch experiment. Both variables, except for the concentration of riboflavin under anaerobic conditions, and the interaction between both variables show significant effects on COD removal. The substrate and riboflavin concentrations also significantly affect on the decolorization of Synozol Red K-4B and Sumifix Navy Blue EXF. In addition, the effect of substrate on color removal was found to be time dependent. The highest COD removal was 85.5%, which corresponds to substrate and riboflavin concentrations of 2,634 mg/L and 23 μM, respectively. The highest color removal for Synozol Red K-4B and Sumifix Navy Blue EXF was achieved after 12 h of treatment, with more than 80% color removal at substrate a...
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