HOLLOW-FIBER MEMBRANE MODULE, PROCESS FOR PRODUCING HOLLOW-FIBER MEMBRANE MODULE, AND HOLLOW-FIBER MEMBRANE UNIT EQUIPPED WITH HOLLOW-FIBER MEMBRANE MODULE

摘要

Provided are a hollow-fiber membrane unit in which the membranes are prevented from decreasing in permeation rate and the membrane area per unit volume has been rendered suitable and which can hence treat water in an increased rate and a hollow-fiber membrane module which is for use in such hollow-fiber membrane unit. The hollow-fiber membrane module comprises either a hollow-fiber membrane sheet composed of hollow-fiber membranes disposed in a sheet arrangement or a stack of such sheets and a box-shaped water collection member which holds the hollow-fiber membrane sheet or stack, wherein one surface of the water collection member has an opening that is filled with a fixing resin (potting resin) and is for fixing the hollow-fiber membrane sheet stack. The water collection member has a thickness of 20 mm or smaller along the out-of-plane direction of the hollow-fiber membrane sheet, and the proportion of the total area of the cross-sections of the hollow-fiber membranes in the one surface having the opening formed therein is at least 45%.