Patent ID: 6790360
Filing Date: 2004-09-14
Classification: B01D,C02F

Abstract:
A process for filtering water comprising the steps of:(a) providing one or more elements of filtering hollow fibre membranes, the membranes having a surface area of at least 500 m2 for every cubic metre of volume of the one or more elements; (b) immersing the membranes of the elements in water to be filtered while withdrawing permeate through the one or more elements at a flux of less than 50 L/m2/h; (c) periodically stopping permeation; (d) backwashing the membranes from time to time during periods of time when permeation is periodically stopped; and, (e) aerating the membranes to scrub the membranes from time to time during periods of time when permeation is periodically stopped.