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In collaboration with the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC), the environmental biotechnology research group at Northwestern University (NU) is conducting a laboratory-scale investigation of enhanced biological phosphorus removal (EBPR) integrated with mainstream deammonification using primary effluent as feed. The research presented here includes (1) A feasibility assessment of combining a high rate activated sludge (HRAS) process with EBPR (herein HRAS-P);(2) A feasibility assessment of mainstream deammonification without bioaugmentation in suspended growth and fixed film bioreactors; and (3) A demonstration of stable and efficient integrated HRAS-P+ deammonification. After an extended period of variable phosphorus removal performance, HRAS-P discharged an average effluent ortho-P concentration of 0.5 mgP/L at an SRT of 2.5 days and an HRT of 4.8 …