The City of Naperville, Illinois has embarked on a treatment technologies evaluation in order to be prepared for potential future water quality standards for phosphorus. The City is committed to proper planning to ensure short-term upgrades are compatible with long-term regulatory requirements.
Membrane processes provide several advantages for meeting stringent effluent limitations and the City was compelled to evaluate this technology. The objectives of this study included evaluating biological and chemical phosphorus removal in a membrane bioreactor system and evaluating chemical
phosphorus removal in a tertiary membrane filtration system. The tertiary membrane filtration system was evaluated to verify the proposed benefits of higher hydraulic loading rates and lower operating costs compared to membrane bioreactor technology due to lower solids loading in the membrane
tank. Results of the City's pilot evaluations including operational configurations, performance, and required chemical doses are presented.
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