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The Bethune Point WWTF Utilizes a Non–Flammable Supplemental Carbon Source and Online Nitrate Analyzers for Process Control to Optimize Low Level Nitrogen Removal

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The Bethune Point Wastewater Treatment Facility, (WWTF) is a 49,210 m3/d (13 million gallon per day) (mgd) annual average daily design flow advanced wastewater treatment facility. The facility is located in Daytona Beach, Florida and discharges a combination of reclaimed water for reuse and treated effluent into the Halifax River. The treatment facility was upgraded in 1999 to include nitrogen and phosphorous removal to achieve the advanced wastewater treatment standard of (5/5/3/1). The upgrade included the addition of methanol as a supplemental carbon source to assist in nutrient removal.

On January 11, 2006 the Bethune Point WWTF suffered a tragic fire and explosion of the methanol storage and feed system at the facility. As the result of this incident, the facility no longer uses methanol as a supplemental carbon source. Beginning in 2009, the City of Daytona Beach evaluated several non-flammable supplemental carbon sources to replace methanol as the supplemental carbon source at the Bethune Point WWTF.

This case study compares and evaluates the performance of the addition of several nonflammable, non-hazardous supplemental carbon sources to enhance nitrogen removal at the Bethune Point WWTF over a twelve month operating period that included multi-seasonal operating conditions. Several different supplemental carbon feed scenarios were evaluated during this time frame including adjusting feed rates to influent flow and loading conditions with the use of continuous online nitrate monitoring equipment coupled with the addition of supplemental carbon through automatic feed forward programmable logic control (PLC)to maximize nitrogen removal.
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Keywords: Alternate Carbon; Denitrification; Feed Forward Control; MicroCglycerin™; Nitrate Analyzers; Supplemental Carbon

Document Type: Research Article

Publication date: 2011-01-01

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