MEMBRANE WASHING APPARATUS AND MEMBRANE SEPARATION APPARATUS

PROBLEM TO BE SOLVED: To provide a membrane washing apparatus capable of sufficiently washing the whole of a membrane surface of a separation membrane and sufficiently recovering a filtration resistance value of the separation membrane as a whole. SOLUTION: A treating apparatus 10 is provided with flapper plate aggregates B1, B2 in which a plurality of flapper plates 6 are provided in parallel and are arranged at a multi-stage between an immersion membrane module 2 installed in a treating tank 1 and a diffuser 50 provided on a bottom part of the treating tank 1. The flapper plates 6 of the flapper plate aggregates B1, B2 form a plate-like shape and are turnably supported to a frame body around a longitudinal axis. An installment angle is adjusted by driving parts 11, 12 and a turning mechanism C. Thereby, a movement direction of bubbles released from a diffusing unit 5 is varied and a feeding of the bubbles to side surfaces 2a, 2b of the membrane can be optionally adjusted.