PURPOSE: To use membranes having an optimum material according to concentration conditions of an original liquid and temp. near the membranes and to lower the operating cost by providing the 1st rotating shaft having filter plates to which an organic membrane is fitted on the original liquid injection port side and providing the 2nd rotating shaft having filter plates to which an inorganic membrane is fitted on the concentrate takeoff port side.
CONSTITUTION: Plural filter plates 44, 48 installed in a separation tank 12 having an original liquid injection port 18 and a concentrate takeoff port 20 are rotated to execute the filtration and concentration. The 1st rotating shaft 34 whose central part is hollow and whose end part is provided with a permeated liquid takeoff port 34 and also which has filter plates 44 to which an organic membrane is fitted is provided on the original liquid injection port 18 side and the 2nd rotating shaft 26 whose central part is hollow and whose end part is provided with a permeated liquid takeoff port 42 and also which has filter plates 48 to which an inorganic membrane is filtted is provided on the concentrate takeoff port 20 side. Besides, rotating means 28, 30, 32, 36, 38, 40 for rotating shafts 24, 26 and the filter plates 44, 48 around the shaft center of the rotating shafts 24, 26 are provided.
FUKUSHIMA YUKIO
ITO MASAMITSU
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