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Organic degradation and extracellular products of pure oxygen aerated activated sludge under different F/M conditions

Author:
Zhang, Hong-Ling, Jiang, Wei-Li, Liu, Rong, Zhou, Ying, Zhang, Yong
Source:
Bioresource technology 2019 v.279 pp. 189-194
ISSN:
0960-8524
Subject:
activated sludge, aeration, air, microorganisms, oxygen, polysaccharides
Abstract:
This study aimed to investigate the effect of food to microorganisms rate (F/M) on organic removal, extracellular polymeric substances (EPS) and soluble microbial products (SMP) of the pure oxygen aerated activated sludge running in batch mode. The F/M rates were controlled by adjusting the MLSS concentrations (2000, 5000, 8000 mg/L) and/or the initial TOC concentrations (100, 500 mg/L). Results showed that at high F/M rate (0.25 kg TOC/kg MLSS), the substrate degradation rate in the oxygen aerated reactor could reach 1.347 mg TOC/(L·min)), much higher than that in the air aerated reactor (0.640 mg TOC/(L·min)). The SMP concentrations with oxygen aeration were also higher than those with air aeration under high F/M conditions. The total EPS contents in the pure oxygen aerated sludge were significantly lower regardless of the different F/M rates. High F/M condition would lead to more amount of polysaccharides synthesis rather than proteins synthesis in EPS.