Water Technologies & Solutions case study
stanton energy center, orlando, florida
Application: Evaporator and crystallizer system used to achieve zero liquid discharge at Florida power plant facility
Capacity: 1700 gallons per minute Location: Orlando, Florida Commissioned: 1995
In the mid-1980s, when faced with water shortages and community pressure to conserve and protect drinking water sources, the state of Florida developed stringent wastewater guidelines.
Like other power plants and industrial sites in Florida, the Orlando Utilities Commission (OUC) needed a way to reduce makeup water requirements and to recycle and reuse as much wastewater as possible at its Stan- ton Energy Center.
With a need for reliability and >95% on-stream availa- bility, in the early 90’s OUC sought out technology im- provements that could help maintain its motto as “The Reliable One.”
Based on the ability to meet the reliability and on- stream demands, veolia was selected to provide a combination evaporation and crystallization system.
Using wastewater from Orange County’s Eastern Wastewater Treatment Facility as bulk scale cooling tower makeup, veolia evaporator and crystallizer technology is taking the cooling tower blowdown stream that might otherwise end up being treated and discharged to the local surface water, and reclaiming it for use as a clean water supply for makeup water to the cooling towers.
This method helps conserve the valuable drinking water supply in Central Florida.
To treat the cooling tower blowdown, veolia’s ZLD system includes four brine concentrator evaporators and four crystallizers, with the final stage systems selected on a sole source basis from veolia because of the proven reliability of the earlier systems.
The evaporative technology used at Stanton Energy is a vertical tube, falling film evaporator driven by a mechanical vapor compressor. The benefit of the evaporator technology is that it enables a large vol- ume of wastewater (95-98%) to be reclaimed as high purity distilled water, which is then usable in many industrial processes, such as for cooling tower makeup.
To achieve ZLD, forced-circulation crystallizers are driven by steam and used to reduce evaporator waste brine to dry solids, which is then locally land- filled.
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With upgrade improvements beginning in the early 1990s, the Stanton Energy Center’s ZLD facility treats approximately 1700 gallons per minute of cooling tow- er blowdown, converting the blowdown stream into high purity reuse water. The ZLD component prevents the discharge of this wastewater stream, and maxim- izes the reuse of wastewater to the greatest extent possible, which in turn limits the need for additional groundwater removal.
veolia’s ZLD process also allows OUC to satisfy their permitting requirements for zero-liquid discharge, and more importantly, conserve Florida’s most valua-ble resource – its drinking water!
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