FLOTATION PREVENTING STRUCTURE OF IMMERSION TYPE MEMBRANE SEPARATION APPARATUS

PROBLEM TO BE SOLVED: To provide an immersion type membrane separation apparatus capable of being prevented from flotation within a treatment tank and capable of easily performing the taking in and out of a filter membrane cartridge. SOLUTION: A casing 3 having opening ports formed at the upper and lower ends thereof is formed so as to be divided into a membrane case 4 housing a plurality of filter membrane cartridges 6 to form an upper structure and an air diffusion case 5 housing an air diffusion device 7 to form a lower structure and the air diffusion case 5 is fixed to a treatment tank and the cartridge press plate 13 preventing the flotation of the individual filter membrane cartridges 6 is fitted to the membrane case 4 and the wt. suppressing the flotation of the membrane case 4 is attached thereto and the membrane case 4 is mounted on the air diffusion case 5 in a freely detachable manner.