Patent ID: 8696904
Filing Date: 2014-04-15
Classification: B01D

Abstract:
1. A reverse osmosis element comprising: a first plurality of leaves wound over and enclosing a plurality of outer permeate tubes of an outer frame and adapted to receive a feed solution and generate a first stage permeate solution and an intermediate retentate solution, each leaf of the first plurality of leaves being coupled to a respective permeate tube of the outer frame; the plurality of outer permeate tubes being adapted to receive the first stage permeate solution; an intermediate channel defined by the plurality of outer permeate tubes and the first plurality of leaves wound over the outer frame and adapted to receive the intermediate retentate solution from the first plurality of leaves of the outer frame; a second plurality of leaves wound over and enclosing a plurality of inner permeate tubes of an inner frame and adapted to receive the intermediate retentate solution and generate a second stage permeate solution and a retentate feed, each leaf of the second plurality of leaves being coupled to a respective permeate tube of the inner frame; the plurality of inner permeate tubes being adapted to receive the second stage permeate solution; a retentate channel defined by the plurality of inner permeate tubes and the second plurality of leaves; and first and second end caps coupled to the plurality of outer and inner permeate tubes, wherein at least one of the first and second end caps comprises a retentate discharge port to discharge the retentate feed, and at least one of the first and second end caps comprises one or more permeate discharge ports to discharge the first stage permeate solution and the second stage permeate solution.