Characteristics of the extracellular products of pure oxygen aerated activated sludge in batch mode

Abstract The effects of pure oxygen aeration on compositional characteristics soluble microbial products (SMP) and extracellular polymeric substances (EPS) the activated sludge acclimated in a sequential batch reactor (SBR) were explored mode. structure would change with different methods or rates. proportion SMP most aerated was less than 10%, while that air as high 30–40%. TB-EPS decreased from 56.95% to 30.63%, LB-EPS increased obviously increase rate. contents protein (PN) polysaccharide (PS) significantly different, PN much higher PS (p < 0.05). zeta potential each component negative, gradually decreasing progress biological treatment. fluorescence peaks SMP, attributed tryptophan PN-like humic acid-like fractions. results showed components could be regulated by adjusting rate mode, so optimize treatment process sludge.