Extended-life water softening system, apparatus and method

B - Operations – Transporting – 01 – D

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B01D 61/02 (2006.01) B01D 61/12 (2006.01)

Patent

CA 2614736

An apparatus and methods for softening water is disclosed. In particular, an apparatus and method for softening water without the addition of ions the wastewater stream is disclosed. The apparatus generally includes at least one nanofiltration filter element configured and arranged to receive an input flow of hard water, discharge an output flow of permeate water comprising a portion of the input flow, and discharge an output flow of non-permeate water comprising a portion of the input flow. The nanofiltration filter element typically has an average pore size that permits the passage of water and monovalent ions but substantially prevents the passage of divalent ions.

La présente invention décrit un dispositif et des méthodes d'adoucissement de l'eau. En particulier, la présente invention décrit un dispositif et une méthode d'adoucissement de l'eau sans ajout d'ions dans le courant d'évacuation des eaux usées. Le dispositif inclut généralement au moins un élément de filtre de type nanofiltration configuré et disposé pour recevoir un débit d'entrée d'eau dure, délivrer un débit de sortie d'eau de perméat comprenant une portion du débit d'entrée, et délivrer un débit de sortie d'eau non-perméée comprenant une portion du débit d'entrée. L'élément de filtre de type nanofiltration présente typiquement une taille de pores moyenne permettant le passage de l'eau et des ions monovalents, mais empêchant substantiellement le passage des ions divalents.

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