Filamentous organism bulking in nutrient removal activated sludge systems: Paper 10: Metabolic behaviour of heterotrophic facultative aerobic organisms under aerated/unaerated conditions

Abstract

A model is outlined for the major biochemical respiratory mechanisms of a conceptualised heterotrophic facultative organism (representing the heterotrophic facultative mass of activated sludge) subjected to four different sets of conditions: steady-st ate aerobic, steady-state anoxic, steady-state aerobic changed to anoxic, and steady-state anoxic/anaerobic changed to aerobic. Proposals and implications of the model regarding changes between these conditions are tested experimentally and verified with special aerobic batch tests on sludges from IAND, 2RND, MUCT, continuous aerobic, and continuous anoxic systems fed municipal sewage.

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