Water Desalination & RO
Evaluation Of Reverse Osmosis Scaling Prevention Devices At High Recovery
EVALUATION OF REVERSE OSMOSIS SCALING PREVENTION DEVICES AT HIGH RECOVERY
Credit to: https://www.usbr.gov/
Advanced Water Treatment Program
Report No. 91
March 2003
U.S. DEPARTMENT OF THE INTERIOR
Bureau of Reclamation
Abstract:
This study evaluated the effectiveness of a magnetic device (MD) and a high voltage capacitance device (HVC) as possible alternatives to the dosing of chemical antiscalants for preventing scaling during reverse osmosis (RO) operation at high product water recovery. The tests were conducted on feed water to the Bureau of Reclamation’s 72-MGD Yuma Desalting Plant located in Yuma AZ. High overall recoveries of greater than 90 percent were achieved by operating a two-stage 4-gal/min RO pilot unit (membrane unit 1 [MU1]) on the concentrate from a 200-gal/min RO unit operating at a water recovery of 70-percent. In these tests, neither the MD nor the HVC were effective in preventing calcium sulfate scaling at 91-percent water recovery. In contrast, the addition of 2 mg/L of sodium hexametaphosphate (SHMP) to MU1 feed water was successful in avoiding scale at recoveries of 93 percent. Dosing of SHMP (or other chemical antiscalant) remains the recommended method for achieving high recovery operation without scaling at the Yuma Desalting Plant.
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Introduction: The Sustainable Water Integrated Management (SWIM) is a European Union(EU)-funded Regional Technical
Assistance Program [1] that “aims at supporting water governance and mainstreaming by promoting sustainable
and equitable water resources management to become a prominent feature of national development policies and
strategies (agriculture, industry, tourism, etc).” [2]
Countries in the south of the Mediterranean are facing increasing water scarcity. This scarcity is driving the need
for augmenting conventional water supply with alternative water sources. Rural and remote areas are particularly
disadvantaged because such areas are often located far away from municipal water supply systems and
conventional water sources, and are often not connected to the electric power grid. There is good potential for
addressing the water scarcity problem in rural and remote areas through sustainable saline water desalination
technologies. Seawater and brackish water desalination are well-established industries comprising a wide variety
of available technologies with decades of accumulated experience. There are many advancements and evolution in
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