METHOD FOR CONTROLLING WATER PURIFICATION, AND A WATER PURIFICATION APPARATUS

    公开(公告)号:US20220305441A1

    公开(公告)日:2022-09-29

    申请号:US17639493

    申请日:2020-09-04

    Abstract: A method for controlling water purification, and a water purification apparatus (1). The apparatus (1) comprises a reverse osmosis membrane (3a) configured to receive feed water from a feed pump (5), and to produce permeate water and reject water. The method comprises measuring (S1) a property indicative of an inlet water quality Cinlet of inlet water to the feed pump (5), and determining (S2) a target recovery for the water purification based on the property indicative of the inlet water quality. The method further comprises controlling (S3) a feed pump speed to a predetermined speed, or to a speed determined based on a relation between the feed pump speed, the inlet water quality Cinlet and a target permeate water quality Cper, based on the inlet water quality. The method comprises measuring (S4) a property indicative of a product water flow rate Qprod, wherein the product water is permeate water that is delivered for consumption, recirculating (S5) a first portion of the reject water, and controlling (S6) a drain flow rate Qdrain to drain, from a second portion of the reject water, to accomplish the target recovery based on the product water flow rate Qprod.

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