| 摘要 |
PURPOSE:To ensure that bathtub water can be recycled by circulation safely and sanitarily by circulating bath water through a microbial treatment device consisting of a filter medium obtained by baking natural porous diatomaceous earth mineral based on silicic acid, and also providing an ultraviolet sterilization device halfway through the circulation route. CONSTITUTION:A packed bed 3 consisting of a blend of a baked product of natural porous diatomaceous earth mineral based on silicic acid e. g. a baked porous stone product such as baked cristobalite, granite porphyry, Oya-ishi, coral sand and zeolite, is provided on a biological treatment tank 2 connected to a bathtub 1 through a water flow passage 4. In addition, a forced circulation pump 5 and a filter 6 are installed in the water flow passage 4 between the inlet 2a of a treatment tower 2 and the outlet 1a of the bathtub 1, an ultraviolet sterilization tower 8 in which an ultraviolet lamp 7 is inserted, is installed in the water flow passage 4 between the outlet 2b of the treatment tower 2 and the inlet 1b of the bathtub 1. Consequently, ammonia, urea and organic substance are treated by decomposition in the packed bed 3 and bacteria are sterilized by the ultraviolet sterilization tower 8. Thus bathtub water is maintained in a clean condition. |
