| 摘要 |
<p>Provided is a low-cost membrane cartridge with which a simple configuration can be used to increase fatigue strength by taking into consideration the inside shape of a joint part joining a filtration membrane to a filtration plate. A membrane cartridge (8), in which a filtration membrane (10) is joined, by a joint part (11) at a peripheral edge thereof, to a surface of a filtration plate (9) made from a thermoplastic resin, is configured such that: a protruded portion (13) higher than the joint part (11) in a thickness direction of the filtration plate (9) is formed at an inner side of the surface of the filtration plate (9) in the vicinity of an inner edge (P1) of the joint part (11); and a tangent line from the inner edge (P1) of the joint part (11) to the protruded portion (13) is inclined at an angle of at least 10˚with respect to a direction parallel to the surface of the filtration plate.</p> |
