A method and a system for performing maintenance on a...

B - Operations – Transporting – 01 – D

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B01D 61/00 (2006.01) B01D 65/02 (2006.01) F03B 13/00 (2006.01) F03G 7/00 (2006.01)

Patent

CA 2634298

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).

Procédé et système permettant de réaliser l'entretien d'une membrane aux propriétés semi-perméables et servant à une osmose retardée par pression PRO, la membrane possédant un premier côté haute pression et un second côté de pression réduite. Une première valve ou pompe commandée par minuterie (31; 41; 51; 61; 71; 81; 91) est connectée entre une entrée (12) du côté basse pression de la membrane (13') et une entrée (11) du côté haute pression de la membrane (13'), ladite première valve ou pompe opérationnelle pour acheminer de manière sélective un bouchon (21) d'un second type d'eau (FW) au premier côté de la membrane de façon à abaisser la concentration de la substance (s) dissoute (s) dans l'eau d'un premier type (SW) au niveau de celle-ci, créant ainsi une fonction de refoulement de pression PRO avec l'eau du second type (FW) du premier au second côté de la membrane sous pression sur ledit premier côté par une arrivée d'eau à haute pression du premier type (SW) en amont dudit bouchon (21) d'eau du second type (SW).

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