Patent ID: 9227159
Filing Date: 2016-01-05
CPC Classification: B01D,C02F

Claim Text:
1. A water treatment system comprising, a microfiltration or ultrafiltration membrane system comprising multiple trains of immersed membranes; a reverse osmosis membrane system; one set of one or more permeate pumps connected to all of the trains; a set of one or more feed pumps for the reverse osmosis system, wherein an outlet from the set of one or more permeate pumps is connected by a closed passage to an inlet of the set of one or more feed pumps, a flowmeter configured to read a rate of flow of permeate from the reverse osmosis system; one or more variable speed drive units connected to the set of one or more permeate pumps; and a controller adapted to receive signals from the flow meter and adjust the speed of the variable speed drive units in correspondence with the received signals to modulate the speed of the permeate pump to produce a desired rate of flow of permeate from the reverse osmosis system.