Seawater and brackish water purification method and apparatus

摘要

PPROBLEM TO BE SOLVED: To provide a cleaning method for seawater or brackish water and an apparatus therefor in which transmissivity is improved by high rate filtration, and further, effective sterilization can be performed by ultraviolet radiation. PSOLUTION: In the method of cleaning seawater and brackish water, the water to be treated containing suspended matter and microorganisms is subjected to biological membrane filtration treatment, and the filtered water to be treated is irradiated with ultraviolet rays, and is sterilized. Further, when the seawater and brackish water are subjected to the biological membrane filtration treatment, the biological membrane filtration is performed preferably in a state where oxygen is not fed to a filtration layer using a granular material with an effective grain size of 2 mm. The cleaning apparatus for seawater and brackish water is provided with a biological membrane filtration apparatus 16 having a filtration layer consisting of a granular filter media, and an ultraviolet radiation apparatus 20 sterilizing the water to be treated. PCOPYRIGHT: (C)2004,JPO&NCIPI