| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of detecting damage to a membrane, capable of detecting the presence/absence of damage to or degradation of a membrane disposed in a membrane filtration apparatus, without setting a specific threshold value in individual measuring instruments. <P>SOLUTION: The method of detecting damage to a membrane for use in a membrane filtration apparatus 1 including a plurality of membrane modules 10 each comprising a switching valve 11, a branched pipe 20 comprising a first measuring instrument 21 through which membrane-permeated water having permeated one of the membrane modules 10 is allowed to flow by switching the corresponding switching valve 11, a common pipe 30 comprising a second measuring instrument 31 through which common-pipe permeate, i.e., membrane-permeated water having joined in the common pipe 30, is allowed to flow, and an arithmetic unit 40, is characterized in that a first measurement value Va with respect to the membrane-permeated water having permeated the one membrane module 10 and allowed to flow through the branched pipe 20 by switching the corresponding switching valve 11 is compared with a first threshold value k1 calculated from a second measurement value Vp with respect to the common-pipe permeated-water to decide the presence of damage to or degradation of the membrane disposed in one membrane module 10A if the first measurement value Va is beyond the first threshold value k1, for each of the membrane modules 10 one after another. <P>COPYRIGHT: (C)2012,JPO&INPIT |
