SEPARATING FILM, SEPARATING FILM ELEMENT, SEPARATING FILM MODULE, SEWAGE AND WASTE WATER TREATMENT DEVICE, AND SEPARATING FILM MANUFACTURING METHOD

摘要

A separation membrane has a porous substrate and a porous resin layer on at least one surface of the porous substrate and the porous resin layer contains a resin. Part of the resin permeates through the porous substrate to form a composite layer. At least one of the following relationships (1) and (2) is satisfied: (1) the porous resin layer has an average pore size in the range of 0.01 to 0.2 mu m and a standard variation of the pore size of 0.1 mu m or less at the surface, and (2) the porous resin layer has macrovoids having short diameters of 0.05xA or more wherein A represents the thickness of the porous substrate, and the rejection of micro particles having an average particle size of 0.9 mu m is at least 90%. This separation membrane can be readily produced by a method for making a separation membrane according to the present invention.