Journal
BIORESOURCE TECHNOLOGY
Volume 279, Issue -, Pages 189-194Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.01.130
Keywords
Pure oxygen aeration; Activated sludge; Food to microorganisms rate (F/M); Extracellular polymeric substances (EPS); Soluble microbial products (SMP)
Funding
- Open Research Fund of Jiangsu Province Key Laboratory of Environmental Engineering [KF2018003]
- Natural Science Foundation of Jiangsu Province of China [BK20171478]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [164320H116]
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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.
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