| 摘要 |
A method is provided for precisely predicting the temporal variation of a membranous filtration resistance, the temporal variation of a transmembrane pressure, the temporal variation of a membranous filtration flux, or the temporal variation of a membranous filtration flowrate as occurs in filtrating a liquid to-be-filtrated with a membrane, in a membranous filtration method wherein the liquid to-be-filtrated is filtrated by the separation membrane with the transmembrane pressure as a driving force. The variation of the membranous filtration resistance, the transmembrane pressure or the membranous filtration flowrate (flux) with time is predicted in a case where the membranous filtration is continued while controlling the membranous filtration flowrate (flux) or the transmembrane pressure to a set value. The method includes a computation step 1a of calculating a constituent component quantity value of the liquid to-be-filtrated that attaches on a surface of the separation membrane at a time t+&Dgr;t, a computation step 1b of calculating a constituent component quantity value of the liquid to-be-filtrated that exists in pores of the separation membrane, a computation step 1c of calculating a consolidation degree of a constituent component of the liquid to-be-filtrated that attaches on the separation membrane surface, a computation step 2 of calculating a membranous filtration resistance value, a computation step 3 of calculating a transmembrane pressure value, and a computation step 4 of calculating a membranous filtration flowrate (flux) value.
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