| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an accurate and convenient measuring method of disinfectant concentration in water to be treated, and to provide a fresh water generation method and a fresh water generation apparatus where the disinfectant addition amount is optimized by the measuring method.SOLUTION: In a fresh water generation method comprising a semipermeable membrane treatment process A of treating water to be treated WA with a semipermeable membrane to produce permeate PA and concentrate CA, after the absorbance U1 of the water to be treated WA is measured beforehand, a disinfectant is added to the water to be treated WA and the water to be treated WA is treated with the semipermeable membrane, and the absorbance U2 of the produced concentrate CA is measured to control continuation/stop of the disinfectant to the water to be treated WA or the flow rate of the disinfectant on the basis of the absorbances U1 and U2.</p> |
