A reverse-osmosis plant is used to treat 30,000,000 gal∕day of seawater at 20∘C containing 3.5wt% dissolved solids to produce 10,000,000 gal∕day of potable water, with 500 ppm of dissolved solids and the balance as brine containing 5.25 wt% dissolved solids.The feed-side pressure is 2,000 psia, while the permeate pressure is 50 psia. A single stage of spiral-wound membranes is used that approximates crossflow. If the total membrane area is 2,000,000 ft2, estimate the permeance for water and the salt passage.

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