HIGH FLOW HIGH RECOVERY SPIRALLY WOUND FILTRATION ELEMENT

摘要

Spirally wound separation devices utilize alternating leaves of carrier material and envelopes of MF, UF, NF or RO membranes which sandwich a permeate sheet. Each envelope is sealed along three edges with one longitudinal edge being open. At the feed axial end of the spirally wound element, there is an annular open region which surrounds the central region of spirally wound leaves, through which annular region the feed liquid is supplied. At the exit axial end, only the now spiral edge of each envelope is open, which provides a very short flow path for the permeate to travel prior to exit from the element. The liquid concentrate exits through a central porous tube. Self-contained separation devices are created by associating dome-shaped heads with each end of such a cylindrical element and then helically and polarly wrapping fibrous material, containing long strands of synthetic fibers, impregnated with polymeric resin repeatedly about the cylindrical surface and the two dome-shaped ends in order to, upon curing of the resin, create a pressure vessel of adequate strength. The device is economic to manufacture and is capable of providing high flow, high recovery filtration treatment of liquids.