Baxter International Inc.

Baxter Healthcare Sa

Angelica Persson

Peter Sendelius

Carl-Henry Öä Örndal

Pontus Lundberg

A water purification apparatus () comprising a Reverse Osmosis, RO, device (). The RO device () comprises a RO membrane () and a feed pump (). The apparatus () also comprises a recirculation mechanism () arranged to recirculate a portion of the reject water to the feed water, a temperature sensor device arranged to measure a temperature indicative of the temperature of the RO membrane (), and a flow rate sensor device arranged to measure a flow rate indicative of the permeate flow rate of the permeate water. The apparatus () further comprises a control arrangement () configured to control recirculation to achieve a predetermined recovery ratio. The control arrangement () is also configured to control the rate of the feed pump (), based on the measured temperature indicative of the temperature of the RO membrane () and a desired permeate conductivity, to make the permeate flow rate equal to, or within a predetermined margin of, an energy efficient permeate flow rate determined based on a predetermined relation between RO membrane temperature, permeate flow rate and permeate conductivity. The disclosure also related to a corresponding method.

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Lund, Sweden

Angelica Persson