To provide a membrane separator capable of stably discharging of a filtrate by a natural discharge route and capable of smoothly charging over the natural discharge route to a forcible discharge route.
The membrane separator 6 includes a membrane separation tank 4 to which a solution to be treated is supplied, the filter membrane 6a arranged in the membrane separation tank 4 so as to be immersed in the solution to be treated and a discharge mechanism 20 for discharging the filtrate, which is subjected to solid-liquid separation treatment by the filter membrane 6a, to the water storage tank 12 installed outside the membrane separation tank 4. The discharge mechanism 20 includes a natural discharge pipe 21 discharging the filtrate by the head difference across the inside and outside of the membrane separation tank 4, the forcible discharge pipe 23 equipped with a pump 24 sucking the filtrate, and solenoid valves 29a and 29b as a route changeover mechanism for discharging the filtrate from either one of the natural discharge pipe 21 and the forcible discharge pipe 23. A gas-liquid separation tank 25 for separating air getting mixed in the filtrate is provided to the natural discharge pipe 21.
COPYRIGHT: (C)2010,JPO&INPIT
Yasuhiro Okawa
Soichiro Yagi
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