| 摘要 |
PROBLEM TO BE SOLVED: To provide a water treatment method utilizing membrane filtration which enables stable water treatment without lowering a filtration performance for a long period by variably supplying the required quantity of ozone at the washing, thereby, suppressing raise of the pressure of the membrane. SOLUTION: Such a cycle that the filtration treatment by the use of a membrane module 6 is performed for raw water 1 as the water to be treated, thereby, the pollutants are removed and, at the same time, back washing is performed at every prescribed time of membrane filtration by using ozone gas produced by an ozone gas generator 14 or ozone-containing water formed by dissolving the ozone gas with an ozone water producing tower 11 is repeated and the water treatment is performed. At this time, a pressure at the membrane inlet at the specified time after starting the membrane filtration on each cycle is measured by a pressure sensor 5, or a pressure difference between the membrane inlet pressure and the outlet pressure is measured and, on the basis of the measurement, the ozone supply amount at the backwashing in the subsequent cycle is adjusted. COPYRIGHT: (C)2004,JPO
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