Case Study | July 25, 2013

Biosphere™ Moving Bed Biological System Enabled Neptune Beach To Achieve Total Nitrogen Limits Without Additional Tanks

Source: Evoqua Water Technologies
MU-Neptune-CS

Nutrients from growing coastal communities threaten bio-diversity: Bio-diversity in Florida’s St. John’s River estuaries is dependent on clean water. Growth in the area’s coastal communities is adding nitrogen and phosphorous nutrients to the river through wastewater discharges.  These nutrients cause rapid growth of some organisms, limit dissolved oxygen availability to others, and upset the balance of a diverse ecosystem.  In 2005, the Florida Department of Environmental Protection began implementing Total Mass Discharge Limits (TMDL) for nitrogen and phosphorous from the area's wastewater treatment plants.

A new TMDL mandated that the City of Neptune Beach reduce nitrogen discharges from its 1.5 MGD wastewater facility from 70,000 pounds to 13,000 pounds per year.  To reach this 80% reduction, a total effluent discharge of 3mg/l total nitrogen needed to be achieved. In its contact stabilization mode of operation, the plant could not accommodate this requirement and needed to change its process.

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