METHOD AND SYSTEM FOR MAKING NITROGEN GAS-DISSOLVED WATER

PROBLEM TO BE SOLVED: To provide a method and system for making nitrogen gas-dissolved water constituted so as to be continuously and stably operated over a long period of time by efficiently performing the discharge of condensed water in making the nitrogen gas-dissolved water by dissolving nitrogen gas in pure water or ultrapure water.SOLUTION: In the method for making the nitrogen gas-dissolved water by dissolving the nitrogen gas in pure water or ultrapure water using a gas dissolving membrane module 2 equipped with a gaseous phase chamber 22 and a liquid phase chamber 23 demarcated by a gas permeable membrane 21, the condensed water produced in the gaseous phase chamber 22 is introduced into the condensed water discharge part 4 connected to the gaseous phase chamber 22 to cut off the connection of the condensed water discharge part 4 with the gaseous phase chamber 22. The nitrogen gas is supplied to the condensed water discharge part 4 in a state that the connection with the gaseous phase chamber 22 is cut off to discharge the condensed water introduced into the condensed water discharge part 4.