Immersion type membrane filter

Abstract

An immersion type membrane filter apparatusis intended for obtaining filtrate by filtrating a fluid to be processed stored within a storage bathand primarily includes a filtration membrane moduleand an air bubbles supply devicedisposed therebelow. The filtration membrane modulehas numerous tubular membraneshaving on the inner surfaces thereof the function of filtrating a fluid to be processed packed within a cylindrical housing vesselhaving a discharge portfor filtrate. The tubular membranesare held in an opened state at both the ends of the housing vessel. The filtration membrane moduleis soaked in a fluid to be processed in such a way that the tubular membranesare opened in the vertical direction. When air bubbles are supplied to the filtration membrane modulefrom an air bubbles supply device, the fluid to be processed flows through the tubular membranesfrom the down side upwards to naturally circulate within the storage bath. Part of the fluid to be processed is filtrated by passing through the tubular membranesfrom the inside to the outside. As a result, the filtrate thus obtained flows out via the discharge portto a filtrate discharge pathway