| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that the chlorine concentration often drops down to a prescribed value or below by vaporization of chlorine so that much of the treated water stored must be discarded and newly treated water should be supplied to business use, swimming pools, etc., in the case the treated water stored in a treated water tank placed behind a purification treatment system is left without being used for a prolonged time in the night or on many other occasions. SOLUTION: While the treated water in the treated water tank is continuously or intermittently circulated by a pump in a time zone when the water is not fed to consumers, the chlorine concentration is measured. When the chlorine concentration drops to the administratively predetermined value , sodium hypochlorite is added to the circulating treated water in such a manner that the chlorine concentration of the treated water in the treated water tank increases gradually. At the time when the restoration of the chlorine concentration is made certain, the dosage of the chlorine is stopped, thus the chlorine concentration is maintained within the prescribed range all the time. COPYRIGHT: (C)2004,JPO
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