B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 63/04 (2006.01) B01D 61/02 (2006.01) B01D 61/04 (2006.01) B01D 61/08 (2006.01) B01D 63/02 (2006.01) B01D 65/02 (2006.01) B01D 65/06 (2006.01) C02F 1/44 (2006.01) C02F 5/00 (2006.01)
Patent
CA 2313740
A filtration module comprising has a plurality of preceding or succeeding stages of hollow fibre membranes. The lumens of the membranes are the retentate or feed side. The lumens of the membranes of the stages are connected in series between a module inlet and retentate outlet. A permeate collection plenum is in direct fluid communication with each stage. The stages are connected by caps typically having dividers located at the ends of the module. The caps and dividers collect the membranes into the stages such that the surface area of the membranes of each preceding stage is between 1 and 2.5 times the surface area of the membranes of a directly succeeding stage and the surface area of the stages decreases from the first stage to the last stage. Liquid, typically water, being filtered flows through the stages in series with interstage flows through the caps and dividers being generally parallel to the periphery of the module. Optionally, the caps and dividers re-collect the membranes into stages such that the same surface area relationship applies when feed flows through the module in a reverse direction. The module is used to filter water and when optionally fitted with hollow fibre membranes adapted to selectively reject hardness causing salts is used to remove hardness. Carbon dioxide or other suitable acids may be added to the feed water to control scaling.
Behmann Henry
Cote Pierre
Husain Hidayat
Bereskin & Parr
Zenon Environmental Inc.
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