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This paper presents the 1989-1999 implementation of the biological phosphorus and nitrogen removal (BNR) technology carried out in 4 separate stages at Calgary’s 500,000 m3/d Bonnybrook WWTP. The paper also summarizes Bonnybrook’s successful BNR experiences in terms of 90 – 100% chemical cost savings, the production of an excellent effluent quality that is much better than the conventional activated sludge processes and consistently meeting Alberta Environment’s stringent effluent standards, as well as the various advantages and disadvantages associated with the BNR processes.

SUCCESSFUL IMPLEMENTATION OF BIOLOGICAL NUTRIENT REMOVAL AT THE 500 ML/D BONNYBROOK WASTEWATER TREATMENT PLANT