| 摘要 |
PROBLEM TO BE SOLVED: To perform a long-term stable cross flow filtering operation by enhancing the operation efficiency of water treatment equipment. SOLUTION: In this cross flow membrane filter control type water treatment equipment, a controller 6 controls the number of rotations and torque of a pump 2 corresponding to the deviation between the membrane filter flow rate measuring value of a membrane module 3 and the set value thereof to automatically control the membrane filter flow rate transmitted through the surface of the membrane module 3. A controller 10 controls the opening degree of a circulating return flow rate electromotive valve 8 corresponding to the deviation between the measuring value of the circulating return flow rate returned to a circulating tank 1 and the set value thereof. The simultaneous stable point of the membrane filter flow rate control and the circulating return flow rate control is extracted to control the operation of both controllers. When the deviation due to the controller 6 enters a range of a certain value, the control of the controller 10 is started to enable a stabilized control. COPYRIGHT: (C)2008,JPO&INPIT
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