WATER TREATMENT METHOD AND WATER TREATMENT APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a water treatment method and a water treatment apparatus which can produce a treated water having a constant level of quality. SOLUTION: The water treatment method comprises: allowing a raw water to flow into a membrane separation module using a reverse osmosis membrane to separate the water into treated water having salt concentration lower than raw water and concentrated water having salt concentration higher than raw water. The raw water continuously flows-in to the membrane separation module, the concentrated water continuously flows-out from the membrane separation module and the treated water continuously flows-out from the membrane separation module. The flow-out quantity of the treated water from the membrane separation module is regulated to be fixed, the concentration of the salts in treated water is regulated to be equal to or below a prescribed value and the flow-in quantity of the raw water to the membrane separation module is changed according to the quantity of the salts passed through the reverse osmosis membrane. COPYRIGHT: (C)2009,JPO&INPIT