Operation method of water treatment system

Abstract

The pure water production unit 1 includes: an RO raw water tank 2 for storing pretreated water W and recycled water W0, a water delivery pump 3, a first reverse osmosis membrane 4, a concentrate tank 5 for storing the concentrate from the reverse osmosis membrane 4, a water delivery pump 6 for the concentrate from the first reverse osmosis membrane 4, and a second reverse osmosis membrane 7. Furthermore, a SiO2 concentration measuring device is provided to measure the SiO2 concentration of the concentrate W3 from the second reverse osmosis membrane 7, providing information about this specific substance. By measuring the SiO2 concentration of the concentrate W3 from the second reverse osmosis membrane 7 and controlling the recovery rate based on this measurement as the operating condition of the second reverse osmosis membrane 7, the water utilization efficiency in the pure water production unit 1 can be improved. According to this water treatment system operation method, specific information in the concentrate of the water treatment unit can be measured, and the operating conditions of the water treatment system can be controlled based on the measured values.

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