Method and a system for performing maintenance on a membrane...

Details Method and a system for performing maintenance on a membrane... Method and a system for performing maintenance on a membrane...

2011-07-05

2011-07-05

Griffin, Walter D (Department: 1778)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S108000, C210S139000

Reexamination Certificate

active

07972514

ABSTRACT:
A method and system for performing maintenance on a membrane having semi-permeable properties and is used in a pressure retarded osmosis PRO, the membrane having a high pressure first side and second side of lower pressure. A time controllable first valve or pump (31; 41; 51; 61; 71; 81; 91) is connected between an input (12) to the low pressure side of the membrane (13′) and an input (11) to the high pressure side of the membrane (13′), said first valve or pump operable to selectively deliver a plug (21) of a second type of water (FW) to the first side of the membrane to lower concentration of dissolved substance (s) in water of a first type (SW) thereat, thereby creating a PRO pressure backwash function with the water of the second type (FW) from the first to the second side of the membrane pressurized on said first side by high pressure supply of water of the first type (SW) upstream of said plug (21) of water of the second type (SW).

REFERENCES:
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patent: 2005/123232 (2005-12-01), None
patent: WO2005123232 (2005-12-01), None
Written Opinion and Search Report mailed May 6, 2008 for International application No. PCT/NO2006/000493, filed Dec. 20, 2006.

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