SPIRAL WOUND MEMBRANE MODULE WITH DEFINED FLOW RESISTANCE SECTIONS WITHIN FEED SPACER

摘要

A spiral wound membrane module adapted for hyperfiltration and including at least one membrane envelope and feed spacer sheet wound about a central permeate tube to form an inlet and outlet scroll face and an outer periphery wherein the feed spacer sheet includes: i) a feed entrance section extending along the permeate collection tube from the inlet scroll face toward the outlet scroll face ii) a feed exit section extending along the outer periphery from the outlet scroll face toward the inlet scroll face and iii) a central feed section located between the feed entrance section and the feed exit section; and wherein the feed entrance section has a median resistance to flow in a direction parallel to the permeate collection tube that is less than 25% of the median resistance to flow of the central feed section in a direction perpendicular to the permeate collection tube.