WATER TREATMENT METHOD AND WATER TREATMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a water treatment method and water treatment device that can efficiently recover salts from water treated by an anaerobic MBR method and can effectively use such salts.SOLUTION: The water treatment method comprises an anaerobic treatment step of using a membrane separation-activated sludge method, in which water that contains organic matter is anaerobically treated and the anaerobically treated water is membrane-separated. The water treatment method further comprises: a condensation step in which anaerobically treated water is condensed by causing the water treated in the anaerobic treatment step to come in contact, via a semi-permeable membrane, with a draw fluid, the draw fluid being configured so as to cause water content from the anaerobically treated water to permeate the semi-permeable membrane to generate osmotic pressure; and a salt recovery step in which salts are recovered from the anaerobically treated water condensed in the condensation step.