| abstract |
A practical fresh water production method and a fresh water production apparatus capable of efficiently removing boron using a semipermeable membrane and obtaining fresh water with high water quality are provided. [Solution] When raw water is treated with the first semipermeable membrane unit and the permeated water of the first semipermeable membrane unit is treated with the second semipermeable membrane unit to obtain fresh water from which specific components have been removed, If the component concentration exceeds the threshold, increase the recovery rate of the first semipermeable membrane unit, decrease the recovery rate of the second semipermeable membrane unit, maintain a constant permeate flow rate, Reduce specific component concentration. [Selection] Figure 1 |