A method and a system for purifying water from a basin, in...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 9/02 (2006.01) C02F 9/08 (2006.01) C02F 9/12 (2006.01)

Patent

CA 2566050

The present invention concerns a method and a system for purifying water from a basin, in particular a swimming pool (1), by circulating a water flow (7) through a filtration system by pumping means (10), whereby at least a sub-flow (28) of the water filtrated in first filtration means (9) and then forwarded to secod filtration means (29) of the filtration system and being subjected to a photochemical treatment in a UV radiation system (40) before returned to the basin, wherein the water flow passing through the first filtration means (9) is filtered in membrane filter means (29), where at least a sub-flow (39) of the water is passed through a membrane filtrated means (29) for e.g. nanofiltration and that at least a partial flow (39) of this membrane filtrated water is irradiated with UV electromagnetic radiation. A system according to the invention is relatively compact due to the avoidance of sand filters. It is by the invention realised that the system and method may be used for purifying different types of water, i.e. not only bath water from swimming pools but also waste water e.g. from domestic households, contaminated water, etc. Moreover, an efficient removal of THM, AOX, EDC, and PO4 as well as micro organisms with only a minimum of molecular chlorine in the bath water is achieved.

L'invention concerne un procédé et un système de purification de l'eau d'un bassin, en particulier d'une piscine (1). Ce procédé consiste à faire circuler un écoulement d'eau (7) dans un système de filtration à l'aide de moyens de pompage (10). Au moins un écoulement auxiliaire (28) de l'eau filtrée dans des premiers moyens de filtration (9) est acheminé vers des seconds moyens de filtration (29) du système de filtration et soumis à un traitement photochimique dans un système de rayonnement ultraviolet (40), avant d'être renvoyé au bassin. L'écoulement d'eau traversant les premiers moyens de filtration (9) est filtré par des moyens à membrane filtrante (29). Au moins un écoulement axillaire (39) de l'eau est amené à traverser des moyens à membrane filtrante (29) par exemple, par nanofiltration. Au moins un écoulement partiel (39) de l'eau filtrée par membrane est soumis au rayonnement électromagnétique ultraviolet. L'invention concerne par ailleurs un système relativement compact du fait de l'absence de filtres à sable. Les système et procédé de l'invention peuvent servir à purifier différents types d'eau, c.-à-d. non seulement l'eau de baignade des piscines mais également les eaux usées provenant des ménages, l'eau contaminée, etc. De plus, l'invention permet d'éliminer efficacement les THM, AOX, EDC, et PO¿4? ainsi que les micro-organismes avec un minimum de chlore dans l'eau de baignade.

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