Multi-stage reverse osmosis systems and methods
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United States of America
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Mar 31, 2020
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Nov 9, 2017
app pub date -
May 4, 2017
filing date -
May 4, 2017
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Abstract
Improved reverse osmosis (RO) systems include at least first and second stages wherein each stage has at least one RO membrane, each stage has a feed stream inlet, permeate stream outlet, and concentrate stream outlet, the feed stream inlet of the second stage is coupled to the concentrate stream outlet of the first stage, the feed stream entering the first stage is pressurized to a first pressure and the feed stream entering the second stage is pressurized to a second pressure, the second pressure being greater than the first pressure. The systems include M number of reverse osmosis membranes in the first stage and N number of reverse osmosis membranes in the second stage, wherein M≥N. The first pressure and second pressure are configured so that flux of the permeate streams of the first stage and the second stage has a spatial variance that is minimized.
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