North and South Durham WRFs Upgrade and Expansion Client: City of Durham Location: Durham, NC The North Durham and the South Durham Water Reclamation Facilities were nitrication plants designed to remove biochemical oxygen demand and suspended solids, and fully nitrify. Hazen and Sawyer was retained to provide full engineering services for condition assessments of the existing plants, master planning for future phased expansion, and design and construction supervision for expansion to 20 mgd while meeting stringent euent standards. Both facilities were designed to achieve low levels of nitrogen and phosphorus removal and have to meet an euent TN of 5.5 mg/L and an euent TP of 0.5 mg/L in the summer and 2.0 mg/L TP in the winter at design ow. Future treatment standards are still bein

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