The City of Xenia, Ohio selected enhanced biological phosphorus removal (EBPR) over chemical phosphorus removal for its two wastewater treatment plants when faced with effluent total phosphorus limits arising from implementation of a total maximum daily load for the Upper Little Miami
River watershed. The University of Cape Town configuration is used at one plant, an anaerobic oxic configuration is used at the other plant. All effluent phosphorus limitations have been successfully met in the two years since discharge limits went into effect. Furthermore, both configurations
have proved to be capable of exceptional performance with less than 0.5 mg/L TP routinely achieved. The major factors limiting performance that have been identified so far include influent wastewater characteristics and recycle loadings from solids handling. Lower influent volatile fatty
acids and higher flows reduce anaerobic detention time for phosphorus release. Recycle phosphorus in belt press filtrate increases influent loading during dewatering operation.
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