| 摘要 |
PURPOSE:To prevent the deterioration in water quality by providing a circulation line which passes feed water to a reverse osmosis membrane by a high- pressure pump and returns the water permeated through the membrane, i.e., pure water, to the suction side of the high-pressure pump through a use point. CONSTITUTION:The feed water is conducted through a supply line 1 to the high-pressure pump 3. The high-pressure pump 3 pressurizes the feed water to the osmosis pressure or above and supplies the same to the reverse osmosis membrane. The permeated water desalted by a reverse osmosis membrane device 4 is directly supplied to a constituting apparatus 9 for cleaning up of water consisting of a polisher, UV sterilizer, filter, etc. The pure water through the apparatus 9 is fed to the use point 10 and is used as cleaning water. The remaining water is returned to the suction side of the pump 3 via the circulation line 11. A check valve 14 to avoid the inflow of the feed water to the circulation line 11 is disposed between the line 11 and the feed water supply line 1 on the suction side 1 of the pump 3. |
