| 摘要 |
A system for withdrawing permeate from a multicomponent liquid substrate includes a reservoir for containing substrate at substantially ambient pressure and one or more membrane assemblies, or skeins, each having, a first header and a second header disposed in vertically spaced-apart relationship with opposed proximal faces at a selected distance and a multiplicity of hollow fiber filtration membranes, or fibers, having end portions sealingly secured to the headers. All open ends of the fibers open to a permeate-discharging face of at least one header, the fibers being disposed essentially vertically, each of the fibers having a length between the opposed proximal faces of the headers, the exterior of the fibers along their lengths in fluid communication with the substrate. Permeate collection means, sealingly connected to any permeate-discharging face of the headers are in fluid communication with open ends of the fibers. A source of suction in fluid communication with the permeate collection means is operable to apply sufficient suction to withdraw permeate through the fibers. The length of the fibers is less than 5% greater than the selected distance and permits restricted displacement of an intermediate portion of each fiber. An embodiment includes gas distribution outlets for discharging bubbles, disposed between the fibers. In another embodiment, the headers of the skeins are elongated, having a short and a long dimension perpendicular to the fibers, and contain no more than 30 fibers across the short dimension, the gas distribution outlets being disposed in a row parallel to the long dimension of the headers. <IMAGE> |
