Phosphorus/Nutrient Removal Evaluation » Donohue & Associates, Inc. Client: North Shore Water Reclamation District Location: Gurnee, Illinois The North Shore Water Reclamation District operates and maintains three wastewater treatment plants in northern Illinois with peak flow design capacities ranging from 28 to 47 mgd. Wastewater treatment at each plant includes primary sedimentation followed by two-stage activated sludge treatment. The first stage of the activated sludge system is intended for carbonaceous BOD5 removal, while the second stage is intended to provide ammonia nitrogen removal through biological nitrification. The State of Illinois has adopted interim phosphorus standards that will require plants to meet a 1 mg/L total phosphorus (TP) effluent limit. In addition to these s

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