| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation method of a membrane separator, capable of effectively reducing the operation cost of the membrane separator, and the membrane separator.SOLUTION: A membrane separator 6 includes a separation membrane 60 which is immersed in water to be treated, and an air diffuser 7 arranged below the separation membrane 60, and obtains treated water penetrating the separation membrane 60 while performing air diffusion from the air diffuser 7 to the separation membrane 60. The membrane separator includes a target value setting means (computation unit) 10a for setting the target value of the air diffusion from the air diffuser 7 based on the inter-membrane differential pressure, and an air diffusion quantity control means (PID control unit) 10b for controlling the air diffuser 6 so that the air diffusion reaches the target value. The target value setting means 10a sets the change or the absolute value of the rate of change of the target value when the air diffusion quantity is increased to be the value larger than the change or the absolute value of the rate of change of the target value when the air diffusion quantity is decreased. |
