A model of localised oxygen sinks around bacterial colonies within activated sludge |
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| Authors: | P. G. Smith |
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| Affiliation: | Department of Civil Engineering, University of Strathclyde, Colville Building, 48 North Portland Street, Glasgow G1 1XN, Scotland |
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| Abstract: | A new mathematical analysis of diffusional resistances of oxygen in activated sludge is developed. It assumes that the distribution of bacteria within activated sludges flocs are in colonies rather than the usual assumption of a homogeneous distribution of bacteria throughout the sludge. The solutions are for steady-state. The bacterial colony model results in a completely different shape of dissolved oxygen gradient in the floc when compared to the homogeneous bacterial distribution model. The new “bacterial colony” model predicts highly localised oxygen demands around the colony with maximum dissolved oxygen deficits in a 20–40 μm dia floc of 2–3 mg l−1. |
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| Keywords: | activated sludge diffusion dissolved oxygen bacterial colonies |
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