Patent ID: 8340924
Filing Date: 2012-12-25
Classification: B01D

Abstract:
1. A membranous filtration method comprising filtering a liquid to-be-filtrated by a separation membrane with a driving force being a transmembrane pressure difference between a liquid to-be-filtrated side and a penetration liquid side of the separation membrane; a membranous filtration prediction method in which, in case of continuing the membranous filtration while controlling a membranous filtration flowrate (flux) to a set value, a variation of a membranous filtration resistance with time and/or a variation of the transmembrane pressure difference with time are/is predicted, wherein at least the set value of the membranous filtration flowrate (flux), an initial value of the membranous filtration resistance, and a constituent component quantity value of the liquid to-be-filtrated are used as numerical values for a membranous filtration prediction computation, and at least the following computation step 1 a , computation step 1 b and/or computation step 1 c , and computation step 2 and/or computation step 3 are executed, thereby to find a membranous filtration resistance value and/or a transmembrane pressure difference value at any desired time, wherein: executing the computation step executing the computation step executing the computation step executing the computation step executing the computation step wherein the computation steps