Abstract
The energy recovery device tested is a freely running turbine driven centrifugal pump used to recover the brine stream hydraulic energy in reverse osmosis (RO) systems and to transfer that energy in the form of a pressure boost to the feed stream. Features of the energy recovery (ER) device include extremely compact size, simple installation, and ease of operation. The Naval Civil Engineering Laboratory (NCEL) operates the Seawater Desalination Test Facility located at Port Hueneme, California, where various energy recovery devices have undergone extensive performance testing relative to a military 600 gallon per hour (gph) Reverse Osmosis Water Purification Unit (ROWPU). One particular device tested has a brine-driven single stage turbine, and feed pressure boosting single stage centrifugal pump joined together by a common shaft. To date, this ER device has operated over 3,000 hours with periodic measurements of performance parameters and internal inspections of the unit to characterize rates of wear.
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