Water Online

May 2016

Water Innovations gives Water and Wastewater Engineers and end-users a venue to find project solutions and source valuable product information. We aim to educate the engineering and operations community on important issues and trends.

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Facility in Alexandria, VA, is currently implementing a full- scale sidestream anammox system to help address Virginia's state regulatory requirement to remove 62 percent of 2005 levels of effluent nitrogen by 2011. AlexRenew selected anammox technology because it can achieve significant nitrogen removal with reduced supplemental chemical addition and energy. (Figure 2) Methodology Using CH2M's proprietar y Pro2D 2 whole plant simulator tool, sidestream treatment with PAD, sidestream treatment with anammox, and a baseline (no sidestream treatment) at three hypothetical wastewater treatment facilities were compared to evaluate the respective benefits and cost- effectiveness of implementing these two treatment technologies. As shown in the process flow diagrams for the three models illustrated in Figures 3, 4, and 5, respectively, the PAD and anammox technologies target different sidestream flow streams; PAD targets digester effluent, while anammox targets the filtrate or centrate produced from dewatering. Each model assumed a flow of 20 MGD, a greenfield site, and the same raw influent characteristics and effluent limitations, including 1 mg/L ammonia-nitrogen, 5.0 mg/L total nitrogen, and 1.0 mg/L total phosphorus. Results • The baseline model could not achieve the effluent l i m i t a t i o n s w i t h o u t supplemental carbon (1,715 pounds per day), but no supplemental alkalinity or carbon was needed for either sidestream treatment model to achieve these limitations. • Both sidestream treatment technologies can remove a significant amount of wateronline.com n Water Innovations 13 NUTRIENTREMOVAL Figure 3. Process flow diagram for the baseline wastewater treatment facility (no sidestream treatment) Figure 2. AlexRenew WRRF process flow diagram with sidestream anammox Figure 4. Process flow diagram for sidestream treatment with PAD

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