Direct osmosis cleaning

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(57) Abstract : A method of cleaning a fouled Re membrane in a module for Re separation, the membrane having feed side and permeate side, the foulant accumulating at the feed side. The cleaning method comprises : feeding concentrated saline solution to the feed side of the Re membrane under the high gauge pressure of the normal Re separation process; feeding dilute saline solution to the permeate side of the Re membrane under higher pressure that the permeate pressure of the normal Re process, so that a net driving differential APN is directed to the feed side, whereby the solvent is being sucked from the permeate side to the feed side, penetrates into the interface between the membrane and the accumulated foulant, and separates the foulant from the membrane urt-ace; and withdrawing the concentrated saline solution together with the separated toulant and the penetrated solvent from the feed side of the Re membrane. (88) Date of publication of the international search report : September 2004 For two-letter codes" and other abbreviations, refer to the "Guidance Notes on Codes and Abbreviations" appearing at the beginning of each regular issue of the PCT Gazette.