METHOD OF OPERATING WATER TREATMENT SYSTEM

Japanese Patent JP2019147072

A

To provide a method of operating a water treatment system capable of efficiently and stably maintaining a large water producing quantity and a high separation performance even in a circumstance in which water quality of supply water to the water treatment system largely varies.SOLUTION: A method of operating a water treatment system of this invention includes a separation membrane element unit provided with plural separation membrane elements E1, the units being capable of switching between a state S1 in which supply water is separated to permeated water and concentrated water and discharged and a state S2 in which the total amount of supply water is discharged as concentrated water. In the method, a following relationship is satisfied: N1