| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical injection control system by which a chemical injection control capable of quickly coping with a rapid change in quality of water to be treated to stabilize the quality of treated water is attained. SOLUTION: The chemical injection control system is provided with a chemical injection means (a flocculant storage tank 4 and an injection pumps 6 and 8) for injecting a chemical (poly aluminum chloride (PAC), an inorganic flocculant or a high molecular flocculant) to control the injection quantity of the chemical in a water treatment system by the injection of the chemical. The chemical injection control system is constituted so as to include a liquid quality measuring means (a turbidimeter 22), a calculating means (25), a calculated result holding means (27), a correction quantity calculating means (29) and an output means (31) and the injection quantity of the chemical is calculated based on a measurement result of the liquid quality of the treated water after the injection of the chemical, the calculated result is held for a prescribed time (a holding time TS) and the injection quantity is corrected by the measured result. As a result, the chemical injection control capable of quickly coping with the rapid change in water quality to be treated can be attained to stabilize the quality of the treated water. COPYRIGHT: (C)2004,JPO
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