| 摘要 |
PROBLEM TO BE SOLVED: To provide a membrane evaluation method in a membrane separation apparatus capable of being normally operated even if flux is reduced caused by fluctuation of water quality by a temperature in winter or the like. SOLUTION: A filtration performance is measured using raw water added with colloidal silica and a separation membrane to be used is evaluated based on the measurement result. The colloidal silica is preferably added to raw water in an amount of 5-20 mg/L and is particularly preferably added thereto such that the total amount of colloidal silica in raw water becomes 10-20 mg/L. Thus, the evaluation test of the membrane is performed by previously adding the colloidal silica to raw water. Thereby, since the membrane separation apparatus is designed at the performance in response to reduction of the flux by fluctuation of the temperature, the membrane separation apparatus can always exhibit a predetermined function. COPYRIGHT: (C)2006,JPO&NCIPI
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