EQUIPMENT FOR PRODUCING PURE WATER FOR BOILER MAKEUP WATER, PRODUCTION OF PURE WATER FOR BOILER MAKEUP WATER AND HOLLOW-FIBER MEMBRANE FILTER UNIT

PROBLEM TO BE SOLVED: To provide the equipment for producing pure water for boiler makeup water by which the insoluble impurities in raw water are efficiently filtered off, and the addition of chemicals and generation of waste are minimized in the treatment for removing the ionic components in the raw water, having sufficient treating performance and compact structure and with the floor space remarkably decreased since the devices such as sand filter and ion-exchange resin tower which have been conventionally used are not needed and to provide the method for producing the pure water for boiler makeup water. SOLUTION: This equipment for producing the pure water for boiler makeup water is provided with an hollow-fiber membrane filter 11 for introducing the raw water contg. such impurities as insolubles and ions to remove the impurities, a reverse-osmosis membrane device 13 provided on the secondary side of the filter 11 and removing ions from the filtered water and an electrodialyzer 15 furnished on the secondary side of the reverse-osmosis membrane device 13 and removing ions again from the deionized water.