| 摘要 |
PROBLEM TO BE SOLVED: To provide a pure water producing apparatus capable of suppressing the growth of bacteria in the inside of a reverse osmosis membrane module while having a dechlorination apparatus.SOLUTION: There is provided a pure water producing apparatus which comprises: a dechlorination apparatus 2; reverse osmosis membrane modules 11 and 12; an electric deionization stack 20; a water supply line L1 for circulating supply water W1 in which chlorine component is removed by the dechlorination apparatus 2 to the reverse osmosis membrane modules 11 and 12; permeated water lines L2 and L3; a desalted water line L8, a discharge line L41 for circulating the supply water W1 staying in the primary side of the reverse osmosis membrane module 11 to the outside of the system; discharging means 5 executable to send the supply water W1 staying in the primary side of the reverse osmosis membrane module 11 from the discharge line L41 to the outside of the system; and a control part 30 for controlling the discharging means 5 so that when a predetermined time has elapsed since the waiting state in which desalted water W6 is not supplied to a demand place is reached, the supply water W1 staying in the primary side of the reverse osmosis membrane module 11 is discharged to the outside of the system. |
