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Abstract

A laboratory scale water purification system for producing up to 300 l/h deionized type 2 pure water from tap water, said system comprising a feed medium flow path including a pump (1) for supplying the feed medium under pressure to a feed inlet of a reverse-osmosis (RO) device (2) which is adapted to produce a permeate flow and a concentrate flow from the feed medium. An electro-deionization (EDI) device (10) is provided and has an inlet which is in fluid communication with a permeate outlet of the RO device (2) and has a purified water outlet. The system has a first retentate flow path (A) in fluid communication with the retentate 1 outlet of the RO device (2), for removing retentate from the system, the first retentate flow path (A) including a first flow rate regulator (3) adapted to be remote controlled, and a second retentate flow path (B) in fluid communication with the retentate outlet of the RO device (2) for recirculating retentate to the feed medium flow path at an upstream position of the pump (1), the second retentate flow path (B) including a second flow rate regulator (4) adapted to be remote controlled. A first flow meter (5) is provided downstream of the permeate outlet for detecting the permeate flow rate produced by the RO device (2), a second flow meter (6) is provided in the first retentate flow path (A) downstream of the first flow rate regulator (3) for detecting the flow rate of the retentate flow that is removed from the system, and an automatic controller (13) is provided for remote controlling the first and second flow rate regulators (3,4) based on the detection results from the first and second flow meters (5,6) such that a predetermined target recovery rate and a predetermined target permeate flow rate are controlled for the RO device (2).

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First Claim