FILTRATION APPARATUS AND IMMERSION-TYPE FILTRATION METHOD USING THE APPARATUS

摘要

The purpose of the present invention is to provide: a filtration device with excellent hollow fiber membrane-cleaning capacity and which is capable of maintaining a high filtration capacity; and an immersed filtration method using said filtration device. The present invention is an immersed filtration device provided with a filtration module having multiple hollow fiber membranes held so as to be even in one direction, and a gas supplier for supplying gas bubbles from below the filtration module. The gas bubbles supplied from the gas supplier are divided into multiple gas bubbles after impact with the filtration module. The mean horizontal diameter of the gas bubbles supplied from the gas supplier is preferably larger than the maximum spacing between the held portions of the multiple hollow fiber membranes in the filtration module.