JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, vol.9, no.4, 2021 (Journal Indexed in SCI)
In this study, treatment of textile wastewater using sequencing anaerobic moving bed biofilm reactor (AnMBBR) and powdered activated carbon - aerobic membrane bioreactor (PAC-AeMBR) was investigated. MBBR was composed by an anaerobic bioreactor with a biocarrier K1 with a filling ratio of 40% (v:v) and operated with 5 different aeration rates (0-0.55 m(3)air/m(3)reactor.min), at a constant HRT of 6 h to evaluate the effect of oxygen on AnMBBR system. The AnMBBR effluent was fed to the PAC-AeMBR for further treatment. In the AnMBBR operation, the adverse effect of aeration on anaerobic color removal was observed when ORP values increased over - 300 mV corresponding to aeration rates over 0.019 m(3)air/m(3)reactor.min, showing high toleration of biofilm layer. Limited aerated MBBR pretreatment provided long-term operation of MBR by decreasing frequency of membrane fouling. The relative abundance of EPS-producing bacteria namely Alphaproteobacteria (68%) was remarkably high in PAC-AeMBR. Considering the obtained results, it was concluded that the AnMBBR and PAC-AeMBR systems with high removals presented itself as a stable system.