| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for operating a membrane separator, capable of preventing the closure of a flow channel of a treating liquid in the membrane separator to smoothly separate the treating liquid into a transmitted liquid and a non-transmitted liquid. SOLUTION: The supply pressure of the treating liquid supplied from a supply tank 1 to a membrane module 3 is made low at the start time of operation of the membrane module 3 and a flow rate regulation valve 7 for discharging the non-transmitted liquid from the membrane module 3 is gradually throttled to raise the pressure of the non-transmitted liquid discharged from the membrane separator and, at the point of time when the flow rate of the non-transmitted liquid discharged from the membrane module 3 is lowered to a predetermined value, the supply pressure of the treating liquid supplied from the supply tank 1 to the membrane module 3 is raised and, thereafter, the supply pressure of the treating liquid supplied from the supply tank 1 to the membrane module 3 and the opening degree of the flow rate regulation valve 7 are controlled so that the pressure and flow rate of the non-transmitted liquid discharged from the membrane module 3 become predetermined values.
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