| 摘要 |
PROBLEM TO BE SOLVED: To extend the life of a membrane cartridge by inhibiting biofouling during membrane treatment with a reverse osmosis membrane or a nanofiltration membrane and preventing deterioration of a membrane functioning layer due to residual chlorine in tap water, realize long life, power saving, and high safety, and prevent contamination in a water storage tank storing membrane filtrate for a long period of time in a water purifier where water is treated with activated carbon and then filtered with a reverse osmosis membrane or a nanofiltration membrane, and the membrane filtrate is stored in the water storage tank. SOLUTION: The water purifier comprises a pretreatment cartridge having an activated carbon treatment part 2b filtering water with silver-impregnated activated carbon, a membrane filter cartridge 4 filtering the water treated by the pretreatment cartridge with a reverse osmosis membrane or a nanofiltration membrane, and the water storage tank 5 storing the water filtered with the membrane filter cartridge, wherein a sterilization unit 6 incorporating an ultraviolet light-emitting diode and a photocatalytic filter is arranged between the membrane filter cartridge and the water storage tank, and a pump 7 and a reflux duct 14 for refluxing the membrane filtrate in the water storage tank into the sterilization unit 6 are installed. COPYRIGHT: (C)2009,JPO&INPIT
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