| 摘要 |
<P>PROBLEM TO BE SOLVED: To rapidly deal with an injection failure of a flocculant by constantly monitoring the injection state of the flocculant, even if the failure should occur. Ž<P>SOLUTION: In a step S1, the turbidity of raw water before the injection of PAC is measured and, in a step S2, the turbidity of raw water after the injection of PAC is measured. In a step S3, the difference between the measured results is calculated. In a step S4, it is judged whether the difference ΔS1 is larger than a predetermined reference value R1 and, in the case of No, in a step 5, it is judged whether the operation order of an air venting valve 13 is issued in the previous routine. In the case of No, an operation order is issued to the air venting valve 13 in a step S6 to return to the step S1. In the case that the answer of the step S4 is No in a subsequent routine, an alarm sound is emitted in a step S7 and, in the succeeding step S8, first-third drain valves 23a-23c are subjected to on-off control and this injection monitor device of the flocculant is operated at a lowered water recovery rate. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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