PHOSPHORUS REMOVAL IN INTERMITTENT CYCLE EXTENDED AERATION ACTIVATED SLUDGE (ICEAS) SYSTEM
A large scale pilot treatment system has been used to study the effect of limiting the dissolved oxygen concentration in intermittent cycle extended aeration activated sludge (ICEAS) system on nutrient removal. The objective was to develop operating data and to establish and verify that operational conditions conductive to biological phosphorus removal can be maintained. It was established that simultaneous nitrification, denitrification and phosphorus uptake occur under limiting dissolved oxygen conditions during the react phase. Total phosphorus content in the reactor increases over time if a phosphorus stripping or controlled phosphorus concentration and removal strategy is not implemented.