Oxygen Transfer Studies in Activated Sludge

by Richard O. Mines, Univ of South Florida, Tampa, FL, USA,
Joseph H. Sherrard, Univ of South Florida, Tampa, FL, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


A bench-scale research project was undertaken to evaluate the two-film model for predicting oxygen transfer rates in sparged suspended growth systems and to determine if interfacial oxygen transfer provides an alternate oxygen transfer pathway in such systems. Two continuous flow completely mixed activated sludge units with diffused aeration systems were operated for approximately 12 months. Oxygen transfer coefficients determined under steady state conditions were observed to increase with an increase in oxygen uptake rate of the mixed liquor. This finding was attributed to interfacial oxygen transfer. Interfacial oxygen transfer was found to be a significant oxygen transfer mechanism when the system exhibited high oxygen uptake rates ( greater than equivalent to 92. 7 mg/l/hr) and high mixed liquor suspended solids concentration ( greater than 1061 mg/l). Determination of alpha and beta coefficients revealed no trend with mean cell residence time. (Author abstract. )

Subject Headings: Oxygen transfer | Activated sludge | Aeration | Benchmark | Project management | Diffusion | Steady states | Turbidity

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