Patent ID: 9212071
Filing Date: 2015-12-15
Classification: B01D,C02F

Abstract:
1. A filtering method using a filtering system comprising a first water bath into which a first membrane cassette and a first membrane cassette for concentrate are submerged, a second water bath into which a second membrane cassette and a second membrane cassette for concentrate are submerged, a first pump for supplying a first negative pressure to the first membrane cassette, a second pump for supplying a second negative pressure to the second membrane cassette, and a common pump for supplying a third negative pressure to the first and second membrane cassettes for concentrate, the method comprising: turning on the first pump, the second pump, and the common pump to supply the first negative pressure to the first membrane cassette, the second negative pressure to the second membrane cassette, and the third negative pressure to the first and second membrane cassettes for concentrate, respectively; turning off the first pump; closing a first path between the common pump and the first membrane cassette for concentrate so that the third negative pressure cannot be supplied from the common pump to the first membrane cassette for concentrate; and cleaning the first membrane cassette and the first membrane cassette for concentrate.