Immersion type membrane separator

Abstract

A submerged membrane separator 31 includes: a casing 33 opened at the top; a plurality of flat membrane cartridges 34 arrayed at intervals in the casing 33; and an air diffuser 36 provided below the membrane cartridges 34. The membrane cartridges 34 are movably held in the up-down direction in the casing 33 while having a space ± in the up-down direction. Lifting suppressing members 63a and 63b for restricting a lifting amount of the membrane cartridges 34 during filtration operation to be smaller than the space ± in the up-down direction are provided in the casing 33.

Description

technical field [0001] The present invention relates to a submerged membrane separation device submerged in liquid to be treated such as activated sludge mixed liquid in a treatment tank. Background technique [0002] Such as Figure 21 As shown, conventionally, as such a submerged membrane separation device 1 , there is a device that is submerged in a treatment tank and separates activated sludge and treated water. The submerged membrane separation device 1 has a box-shaped casing 2 opened up and down, a plurality of membrane cartridges 3 arranged in parallel to each other inside the casing 2 , and an air diffuser 4 provided below the membrane cartridges 3 . [0003] The membrane filter element 3 has a filter plate 12 and filter membranes 13 mounted on both sides of the filter plate 12 . Moreover, the air diffuser 4 is comprised so that air may be blown out from an air diffuser pipe. In addition, a pressure plate 5 for preventing the membrane filter element 3 from floatin...

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Problems solved by technology

[0006] However, since there is a gap between the upper end of the membrane cartridge 3 and the pressure plate 5, there is a problem that the upper end of the membrane cartridge 3 contacts the pressure plate 5 due to the upflow 17, the membrane cartridge 3 vibrates slightly, and the The upper end is repeatedly contacted with the pressure plate 5 to wear

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