Filamentous organism bulking in nutrient removal activated sludge systems: Paper 11: A biochemical/microbiological model for proliferation of anoxic-aerobic (AA) filamentous organisms

Abstract

A model is presented that describes the competitive growth behaviour of floc-forming and anoxic-aerobic (AA) filamentous organisms in long sludge age nitrogen (N) and nitrogen and phosphorus (N&P) removal activated sludge systems. The model, referred to as the bulking model, establishes the potential for filamentous organism proliferation under various aeration and substrate feeding regimes. Based on the principles of the model, system configuration and operational procedures are proposed for the amelioration of bulking and are tested experimentally. To examine the general applicability of the bulking model it is tested by applying it to the experiments described by Lakay et al. (1999) and Musvoto et al. (1999). [Note: Throughout description of the bulking model, the terms filamentous and filaments refer specifically to AA filaments (formerly designated low F/M filaments), which are associated with poorly settling sludges in long sludge age N and N&P removal systems].

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