Conditioning process and device for producing pure water

Abstract

The invention pertains to a process for the production of pure water, in which raw water, or feed water similarly, is fed to a treatment apparatus (1) that has at least one semi-permeable membrane (4), in conjunction with which a partial quantity of the raw water passes through the membrane (4) as pure water under the driving force of a pressure differential, and the remaining quantity of raw water that flows past the membrane leaves the treatment apparatus (1) as concentrate. In order to counteract any excessive soiling of the membrane (4), and to attain the longest possible operational and membrane service lifetimes, it is provided that the direction of flow of the raw water past the membrane (4) is reversed at intervals of time. The invention also pertains to a treatment apparatus (1) for the production of pure water, with at least one semi-permeable membrane (4). The treatment apparatus (1) has at least two apparatus openings (10, 11) that feed into its raw water, or feed water, area (5), one of which is used as a water inlet for feeding the raw, or feed water to the membrane (4), and the other is provided as a water outlet for the concentrate, and at least one pure water outlet in its pure water area (6), the treatment apparatus openings (10, 11) that lead to the raw water, or feed water area (5) are provided with a flow reversing device to at intervals of time alternately be used as a water inlet or as a water outlet.

Dependencies are inferred from the claim text.