| 摘要 |
PROBLEM TO BE SOLVED: To provide a method hardly causing the deposition of microorganisms or their metabolic products on a separation membrane and the reduction of the amount of produced water in the method for producing water by using a separation membrane. SOLUTION: In the process of adding a sterilizer to the raw water and supplying the water to the separation membrane, at least one condition selected from the group of the concentration of the sterilizer added, time of addition and frequency of addition is controlled based on the following factors. The factors are the viable cell count in the raw water and the concentration of assimilable organic carbon, or the volume of bacteria in the raw water and the concentration of assimilable organic carbon, or the viable cell count in the raw water and the biofilm formation rate, or the volume of bacteria in the raw water and the biofilm formation rate.
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