| 摘要 |
PROBLEM TO BE SOLVED: To provide a membrane failure detector of a membrane filter device which is capable of making judgment, with good accuracy, that the membrane of a membrane filter device is damaged or ruptured or the membrane is normal, a method therefore and an operating method for the same. SOLUTION: This membrane failure detector of the membrane filter device has a turbidity detecting means 4 on the outflow side of the membrane filtrate of a filter membrane module 3, which consists of a filter membrane consisting of a hollow fiber membrane, is supplied with raw water via a circulating pump 2 and separates the raw water to circulating water and the membrane filtrate. The detector has a control means 5 which judges the presence or absence of the damage or rupture of the filter membrane of the membrane filter device from the pressure holding rate of the pressurized air by judging that there is the possibility of the damage or rupture of the filter membrane of the filter membrane module 3 when the turbidity detecting means 4 detects the value above the prescribed value for a prescribed time or longer, then supplying the pressurized air subjected to sterilization to the outflow side of the membrane filtrate of the membrane filter device, thereby putting the filter membrane into the holding state. The method therefor and the operating method for the same are provided.
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