APPARATUS FOR MAKING PURE WATER

PURPOSE:To miniaturize the titled apparatus and to obtain high purity water by substituting the elemental machinery of a primary pure water system with an evaporation apparatus, by arranging a raw water cooler in the condensing part of an evaporation apparatus partitioned by a gas permeable membrane and sending raw water from the cooler to the evaporation part of the evaporation apparatus while heating the same. CONSTITUTION:An evaporation apparatus 10 is partitioned into an evaporation part 10a and a condensing part 10b by a gas permeable membrane 11 and a raw water cooler 12 is arranged in the condensing part 10b. Raw water passing through the cooler 12 passes through piping 13 and a part thereof is drained to a drain tank 14 while the remainder is guided to the suction side of a water feed pump 15 and passed through the evaporation part 10a of the evaporation apparatus 10 through a heater 16 to be drained to a drain tank 17. The raw water is evaporated in the evaporation part 10a while generated steam is flowed in the condensing part 10b through the gas permeable membrane 11 and condensed under cooling by the cooler 12 to form pure water which is, in turn, led out from a pure water feed-out pipe 18. The pure water from this primary pure water system is treated with a secondary pure water system consisting of an ultraviolet sterilizing lamp 20, a polisher 21 and an ultrafiltration apparatus 22 to be sent to a use point 23. Unused pure water B and the waste water B' of the ultrafiltration apparatus 22 are returned to the water feed pump 15.