| 摘要 |
PURPOSE:To obtain general water, cooling water, sprinkling water, pond water, fire protection water, living water for disaster emergency, etc., by storing the rain water to the roof surfaces, etc., of buildings at the time of a rainfall into a rain water storage and subjecting the rain water to a treatment to remove the fine particles of water polluting components, SS component, polluting components, etc., included in the rain water. CONSTITUTION:A raw water circulating pump 1 is operated by fully opening the circulating side of an automatic three-way valve 2 and fully closing the filter direction thereof by a circulation system built into a control panel 15 of the rain water treatment unit in the case the circulation of the stored water and the maintenance of its hygienic water quality are to be carried out. The residual chlorine and pH of the stored water lifted in such a manner are measured by a residual chlorine meter and pH meter mounted at a circulation pipeline. A sodium hypochloride injector 13 and a pH adjuster 14 are operated by the signal instructions of respective instrumentation apparatus to inject respective chemicals into the water if the measured values do not attain the set values. Only the circulation is executed when the measured values attain the set values. |
