You'd Think Starting Up a 5-Stage Bardenpho™ Would be Easy, But…

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The City of Cape Coral's Everest Water Reclamation Facility (EWRF) started up in June, 2008. The EWRF uses a 5-stage Bardenpho™ process, converted from a 4-stage process. With the hurricane season in effect, the need to discharge to the Caloosahatchee River was imminent at any time. The EWRF effluent limits for surface water discharge are 20:20:3:0.5 mg/L for CBOD:TSS:TN:TP respectively, and the effluent was not meeting the TN limit. All of the effluent from the City's WRFs is used for irrigation except on the occasions during wet weather, which of course includes hurricanes, when there is no need for irrigation. When there is no need for irrigation and the reclaimed storage tanks are full, the remaining effluent must be discharged to the River. When the EWRF discharges to the River, the effluent MUST meet the permit requirements. Start-up was supposed to consist of merely transferring mixed liquor from the existing 4-Stage Bardenpho™ tanks (that were meeting effluent permit limits) to the newly constructed 5- Stage Bardenpho™ tanks, with the expectation the effluent quality would be maintained. However, as with any start-up, issues arose with process performance, impacting the quality of the effluent.

This paper will present a summary of the Cape Coral Utility Expansion Program (UEP), a more detailed discussion of some of the issues encountered and resolved during start-up of the newly constructed facilities, and some of the lessons learned during startup.

Keywords: 5-Stage Bardenpho™; biological process modeling; nutrient removal; start-up

Document Type: Research Article


Publication date: January 1, 2009

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