Abstract
The reduction in the trans-membrane pressure In successive stages of brine staged RO systems adversely affects the permeate quality. Interstage pressure boosting can restore the trans-membrane pressure resulting in improved permeate quality and greater permeate flux rates. A novel method of interstage boosting is to use the Hydraulic TurboCharger™ or “Turbo”. The Turbo is a freely running turbine-driven centrifugal pump entirely energized by the high pressure brine. Computer simulations show that the Turbo can significantly reduce permeate salinity via optimization of the trans-membrane pressure in each stage while allowing a reduction in first stage membrane pressure thereby yielding a substantial reduction in feed pump energy consumption. The simulation uses iteration to find the equilibrium operating conditions between the feed pump, membranes, and Turbo. Feed pump performance characteristics, membrane operating parameters, and Turbo hydraulic characteristics can be independently set in the simulation. Simulation results include membrane pressures, permeate salinity, and feed pump energy consumption.
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