IMMERSION TYPE MEMBRANE SEPARATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an immersion type membrane separation apparatus having a micro gas bubble spray pipe having a predetermined length or more, capable of uniformly generating sprayed air. ! SOLUTION: An immersion type membrane separation apparatus 13 has a plurality of micro gas bubble spray pipes 9 extending in the direction intersecting the membrane surface of a separation membrane element. The micro gas bubble spray pipe 9 includes at least a cylindrical supporting pipe having a plurality of holes in the peripheral surface and an elastic sheet having fine slits. The elastic sheet is disposed to cover the outer periphery of the supporting pipe. The supporting pipe has a length in the longer direction of 1000 mm or more. The fine slits in the elastic sheet have a total slit length per length of the micro gas bubble spray pipe 9 in the longer direction of 9 to 20 m/m. The gas supplied to the inside of the supporting pipe flows into the gap between the supporting pipe and the elastic sheet thr