A method and a system for purifying water

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 9/00 (2006.01) C02F 1/32 (2006.01) C02F 1/44 (2006.01) C02F 1/00 (2006.01)

Patent

CA 2316222

The invention provides a method and a system of purifying water, in particular chlorinated bathing water in a swimming pool (1), by circulating the water through a filter device (2) for filtration of the water, and then at least a subflow (6) of the filtered water on the clean water side of the filter device is passed through a UV system (3) for photochemical treatment, wherein this first subflow (6) is irradiated intensively with electromagnetic radiation from one or more metal dosed UV intermediate pressure lamps during the passage through the UV system, and then a second subflow (7) of photochemically treated water is withdrawn from the first subflow (6) for nanofiltration or reverse osmosis treatment in a membrane filter device (4). With the present invention it is now possible also to remove carcinogenic substances, such as THM and AOX from the bathing water in swimming pools or the like. It is moreover realized by the invention that a method according to the invention may also be used for removing biocides, pesticides and peroxides, which makes the method according to the invention suitable for purification of water to produce drinking water.

La présente invention se rapporte à un procédé et à un système de purification de l'eau, notamment de l'eau chlorée destinée à la baignade dans une piscine (1). Ledit procédé consiste à faire circuler l'eau dans un dispositif de filtrage (2) conçu pour filtrer l'eau, puis à faire passer au moins un flux secondaire (6) d'eau filtrée dans un système de traitement par les ultraviolets (3) conçu pour effectuer un traitement photochimique. Le premier flux d'eau filtrée (6) est exposé de manière intensive à un rayonnement électromagnétique émanant d'une ou plusieurs lampes à pression intermédiaire à ultraviolets, dosées par des métaux, lors du passage dans le système de traitement par ultraviolets, puis un second flux secondaire (7) d'eau ayant subi le traitement photochimique est supprimé du premier flux secondaire (6) par nanofiltration ou osmose inversée dans un dispositif de filtrage à membrane (4). Conformément à cette invention, il est maintenant possible d'éliminer les substances carcinogènes, du type THM et AOX, de l'eau destinée à la baignade dans des piscines ou analogues. Cette invention se rapporte également à un procédé permettant d'éliminer les biocides, pesticides et peroxydes de l'eau, ce qui fait que cette invention est adaptée à la purification de l'eau visant à produire de l'eau potable.

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