Influence of aeration intensity on the performance of A/O-type sequencing batch MBR system treating azo dye wastewater

摘要: Among the numerous parameters affecting membrane bioreactor (MBR) performance, aeration intensity is one of most important factors. In present investigation, an anoxic/aerobic-type (A/O-type) sequencing batch MBR system, added anoxic process as a pretreatment to improve biodegradability azo dye wastewater, was investigated under different intensities and impact on effluent quantity, sludge properties, extracellular polymeric substances (EPS) amount generated well change permeation flux were examined. Neither lower nor higher could A/O-type performances. The results showed 0.15 m3·h−1 promising for treatment wastewater conditions Under this intensity, chemical oxygen demand (COD), ammonium nitrogen color removal amounted 97.8%, 96.5%, 98.7% 6.21 L·m−2·h−1, respectively. quality, with 25.0 mg·L−1COD, 0.84 mg·L−1 8 chroma, directly meet reuse standard in China. meantime, relative hydrophobicity, bound EPS, soluble EPS amounts contained fouling layer 70.3%, 52.0 mg·g−1VSS, 38.8 mg·g−1VSS 90.8 respectively, which close relationships both pollutant removals flux.