| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid separating element by which ordinary fluid separation can be performed in a short time after operation is started even in a case where an original water with a low TOC concentration is treated such as a field for manufacturing ultrapure water and with a slight self-eluation of organic carbon. SOLUTION: The fluid separating element with a membrane unit containing a feed liquid flow path material, a separating membrane and a transmitted liquid flow path material around a water collecting pipe is such a fluid separating element in which after a water with a TOC concentration of 1-3 ppb and a temperature of 50 deg.C is washed by transmitting it through for 1 hour by a membrane transmitting flux density of 0.3 m3/m2/day, when a water in a range of a TOC concentration of 1-3 ppb and at a temperature of 25 deg.C is treated by a membrane transmitting flux density of 1.0 m3/m2/day, a relation between the TOC concentration (TOCin) of the original water after 3 hours passes from starting of the treatment and the TOC concentration (TOCout) of the transmitted water is TOCout-TOCin<=2 ppb.
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