FILTRATION DEVICE, AND FILTRATION METHOD USING SAME

摘要

The present invention is a filtration device which is equipped with: a filtration vessel in which a microorganism-containing solution to be treated is stored; an immersion-type filtration module which is arranged in the filtration vessel and has multiple separation membranes; and a first gas supply unit by which air bubbles for washing the separation membranes can be generated from beneath the immersion-type filtration module. The filtration device is additionally provided with a second gas supply unit which is arranged below the filtration vessel apart from the first gas supply unit and by which air bubbles for supplying oxygen can be generated. In the filtration device, air bubbles are generated by the first gas supply unit to form an air bubble rising-prevented zone above the second gas supply unit. It is preferred that the air bubble rising-prevented zone has a downward flow of the solution to be treated. Alternatively, the air bubble rising-prevented zone may have a disturbed flow of the solution to be treated.