Effect of operating parameters on color and COD removal performance of SBR: Sludge age and initial dyestuff concentration

Decolorization of Reactive Red 195 by a mixed culture in an alternating anaerobic–aerobic Sequencing Batch Reactor

“…The color removal process maintained the same pattern as observed in the previous phase: most of the dye and COD were removed under anaerobic conditions. Kapdan and Ozturk [30], operating an anaerobic-aerobic SBR fed with Reactive Red containing wastewater, found that the main color removal phase was the anaerobic react and the contribution of the aerobic phase was basically negligible.…”

The effect of hydraulic residence time and initial COD concentration on color and COD removal performance of the anaerobic–aerobic SBR system

“…It is widely used in nutrient removal from wastewater [35,36]. The application of SBR to color removal is rather a new approach compared to anaerobic-aerobic sequential treatment [37][38][39][40][41][42]. Therefore, this study was designed to investigate the potential of the SBR system in textile wastewater treatment.…”

Biodegradation of Azo Dyes in Anaerobic–Aerobic Sequencing Batch Reactors

“…In the case of exceeding the reactor's biological azo dye reduction capacity, high dye concentration may adversely affect the dye removal efficiency and COD removal efficiency. Kapdan and Ö zturk [10] reported that increasing initial dyestuff concentration adversely affect the COD removal performance of SBR. Nevertheless, dye removal rate may be increased by increasing dye concentrations [52].…”

“…Though anaerobic treatment removes the color of the dye, aromatic amines resulting from decolorization process in the anaerobic treatment are not mineralized under anaerobic conditions and tend to accumulate to toxic levels [7,9]. Single-step anaerobic processes also have limitations in terms of low chemical oxygen demand (COD) removal [10]. To remove the breakdown products of dyes from the wastewater, it has been frequently reported that aerobic conditions are essential in which many aromatic amines are readily further mineralized as well as remaining COD.…”