| 摘要 |
PROBLEM TO BE SOLVED: To provide a membrane filtration method which enables the membrane filtration of water to be treated, such as ground water, river water, lake and marsh water, sea water and secondarily treated sewage water, to obtain filtrated water, suppresses an increase in filtration resistance for a long period of time, and makes a stable membrane filtration operation possible. SOLUTION: A membrane module for water treatment employs a separation membrane, which comprises a poly(vinylidenefluoride)-based resin, as a membrane filter. In this case, a membrane, which has a filtration resistance increase degree A of 2×10<SP>12</SP>/m<SP>2</SP>or larger, back washing restorability of 50% or larger, a filtration resistance increase degree B of 2×10<SP>12</SP>/m<SP>2</SP>or smaller and an initial filtration resistance of 1×10<SP>12</SP>/m or smaller, is used as the separation membrane. Water filtration processing is carried out by using a membrane filtration device equipped with the membrane module while physical washing is periodically being carried out, thereby producing filtrated water. COPYRIGHT: (C)2008,JPO&INPIT
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