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    • 6. 发明专利
    • BACK WASHING METHOD FOR PLEAT TYPE FILTER
    • JPH119914A
    • 1999-01-19
    • JP17054597
    • 1997-06-26
    • EBARA CORP
    • INO TAKAOHOSHINO NORIOMISAWA HIDEYUKI
    • B01D29/07B01D29/62B01D29/66
    • PROBLEM TO BE SOLVED: To provide a back washing method for a pleat type filter in which a small amount suffices for the discharged amount of washing water and recovery properties of filtration performance are good and filtration life is prolonged. SOLUTION: In the back washing method for pleat type filters 5, 6 which are suspended by tube plates between the upper cylinder and the lower cylinder in the insides of the filters, a simple back washing method is combined with an ordinary back washing method. In the simple back washing method, water passage is stopped by rise in pressure difference of water passage and filters 7, 8 are pressurized by feeding pressurized air from the upper parts thereof. Drain valves 14a, 15a in the lower parts of the filters 7, 8 are opened and a part of water in the upper drums 1, 2 is allowed to flow backward and discharge from the lower parts of the filters to discharge suspended impurities of the filters. In the ordinary back washing method, water passage is stopped by rise in pressure difference of water passage. The filters are pressurized by feeding pressurized air from the upper parts thereof and also drain valves 14a, 15a in the lower parts of the filters are opened. All parts of water in the upper drums 1, 2 are allowed to flow backward to discharge suspended impurities of the filters 1, 2. Air and water are sent from the lower parts of the filters 7, 8 to perform scrubbing. Furthermore, pressurized air is fed from the upper parts of the filters 7, 8 to pressurize them and back washing is performed by water in the upper drums 1, 2.
    • 9. 发明专利
    • METHOD FOR WASHING HOLLOW YARN MEMBRANE
    • JPS61157306A
    • 1986-07-17
    • JP27433084
    • 1984-12-28
    • EBARA CORP
    • MARUYAMA SHINSAKUINO TAKAOHOSHINO NORIOOKAZAKI HARUO
    • B01D63/04
    • PURPOSE:To enable the washing of a hollow yarn membrane even at the stop period of filtering and during filtering operation, by withdrawing a filtered substance released by vibration due to external force from a liquid withdrawal port separately provided to the outside part of a hollow yarn membrane. CONSTITUTION:When the amount of a filtered substance adhered to a hollow yarn membrane became much by filtering waste water containing a suspended substance from a waste water supply tank 1 by a hollow yarn membrane module 4, valves 5, 18 are opened and air is supplied from a compressed air supply pipe 12 to impart vibration to the hollow yarn membrane to release the sedimented filtered substance. The released filtered substance is withdrawn to a high conc. waste liquidstorage tank 7 as the high conc. waste liquid of the suspended substance from a washing solution withdrawal pipe 9 to be separately treated. During this time, the washing of the hollow yarn membrane is performed while usual filtering is continued. A valve 4 of a treated liquid withdrawal pipe 8 is closed at the stop time of filtering operation to perform the same operation. After vibration was imparted to the hollow yarn membrane, air is withdrawn from the washing solution withdrawal pipe 9 along with the washing solution.