| 摘要 |
PURPOSE: A controlling method of an inflow water-responsive type membrane filtering water purification system using the automatic control of the circulating rate is provided to control the operation time of cross current and the amount of circulating water(the circulating rate) which is condensed water supplied back to a membrane module through circulation, by automatically controlling the degree of opening and closing of a valve equipped in a circulating circuit in proportion to the detected value of membrane contamination contribution factors. CONSTITUTION: A control method of an inflow water-responsive type membrane filtering water purification system using the automatic control of the circulating rate includes the following steps: Membrane contamination contribution factors which correspond to the turbidity, the amount of floating materials, the number of algae, or the total amount of organic carbon which passes through a membrane module(40) are measured. A circulating rate determination index is calculated to decide the circulating rate of water which will be supplied to the membrane module after circulating through a circulation pipe(42), based on the measured membrane contamination contribution factors. The circulating rate is determined from the circulating rate determination index calculated above. A circulating valve(43) is automatically controlled based on the circulating rate decided above. The back washing work is performed to a filtration membrane(41). |
