Membrane module protection

摘要

A filtration system for removing fine solids from a liquid suspension comprising a vessel for containing the liquid suspension, one or more permeable, membranes (9) within the vessel, means for providing a pressure differential across walls of the membranes (9) such that some of the liquid suspension passes through the walls of the membranes (9) to be drawn off as permeate and means for withdrawing the permeate from the membranes. A screen (8) is positioned in a flow path of the liquid suspension through to the membrane walls.