| 摘要 |
PROBLEM TO BE SOLVED: To improve the water collecting efficiency of permeated water, and the peeling and the worming effect of a gel layer adhering to the inner surface of a tubular membrane by air scraping even when height is short. SOLUTION: This internal pressure type tubular membrane module consists of a vessel 1 having partition plates 15 and 16 inside both ends, and a plurality of tubular membranes 2 attached between both partition plates by fixing one end and the other end to both partition plates in a piercing shape. A feed water chamber 4 for raw water, a drainage chamber 3 to discharge concentrated water outside, and a water collecting chamber 5 to take the permeated water outside are provided. The raw water is pressurized and fed to the feed water chamber 4, the permeated water passing through the tubular membrane from the inside to the outside in a process in which the raw water flows the hollow part of the tubular membrane is taken out from the water collecting chamber outside, and the concentrated water in the raw water not passing through the tubular membrane is discharged outside from the drainage chamber 3. In this internal pressure type tubular membrane module, the vessel 1 is placed horizontally, an inlet nozzle 21 connecting an airpipe 22 for feeding scraping air to the drainage chamber is arranged offset upwards with respect to the center of vessel, and an outlet nozzle 31 connecting an exhaust pipe 32 to discharge the scraping air from the feed water chamber is arranged offset downward with respect to the center of vessel.
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