| 摘要 |
PROBLEM TO BE SOLVED: To provide a disinfection equipment of confluent type sewage capable of determining an optimum injection amount of a disinfectant even in the case of a large fluctuation in the quality and amount of sewage. SOLUTION: A disinfectant injection ratio target value operation means is constituted so as to operate the concentration of available chlorine in a sodium hypochlorite solution consumed by a chlorine consuming substance contained in an organic substance on the basis of the concentration of the organic substance inputted from an organic matter concentration operation means to add the same to a disinfectant injection ratio target value. Further, the disinfectant injection ratio target value operation means operates the concentration of available chlorine to be required in sewage on the basis of the contact time of sewage and the disinfectant inputted by contact time operation means to add the same to the disinfectant injection ratio target value. By this constitution, even in the case of the fluctuation in the amount of sewage, the injection amount of the disinfectant sufficiently necessary for reducing a coliform group to a predetermined value or below is accurately determined. COPYRIGHT: (C)2005,JPO&NCIPI
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