SEPARATION MEMBRANE ELEMENT FOR FILTRATION AND MEMBRANE MODULE FOR FILTRATION.

摘要

A separation membrane element for filtration which has excellent filtrating performance and is excellent in chemical resistance and mechanical strength and with which a stable permeation flow rate is obtained over long. The separation membrane element for filtration is immersed in a suspensoid-containing liquid to be treated and is used for conducting solid-liquid separation. The element comprises: a cylindrical filtration membrane which has been obtained by forming a porous sheet comprising a porous stretched PTFE (polytetrafluoroethylene) film into a cylindrical shape and in which the hollow surrounded by the porous sheet serves as a treated-liquid passage; a support material for maintaining the hollow serving as a treated-liquid passage; and sealing parts which seal both axial-direction ends of the cylindrical filtration membrane so as to leave at least one treated-liquid takeout opening.