| 摘要 |
The present invention provides a membrane filtration device capable of performing radio communication well by disposing the radio antenna in a more suitable manner. The membrane filtration device includes an internal member (100) disposed at a position different from that between the filtration membrane within the pressure vessel (40) and an inner wall of the pressure vessel (40), at least a part of an outer wall of which is close to the inner wall of the pressure vessel (40), and a radio antenna (103A) disposed in the internal member (100). Since at least a part of the outer wall of the internal member (100) is close to the inner wall of the pressure vessel (40), the thickness of the raw liquid present between the outer wall and the inner wall of the pressure vessel (40) is small, so that the damping of the radio wave due to the raw liquid can be restrained, thereby making it possible to perform the radio communication well. Furthermore, restrictions on the position at which the radio antenna (103A) is disposed can be alleviated, and the radio antenna (103A) can be disposed in a more suitable manner as compared with a case in which the radio antenna (103A) is provided between the filtration membrane within the pressure vessel (40) and the inner wall of the pressure vessel (40). |
