LEGIONERA POLUTION AND WATHER QUALITY MANAGEMENT OF ROOF REPLANTING UTILIZATION WATER

The roof replanting system is excellent as the technology, which eases the global warming. Especially, Tokyo Metropolitan Government and Ministry of Land, Infrastructure and Transport Japan positively promote this system. In the meantime, next fact is necessary so that these may spread further. That is to say, the first is the security of the water source necessary for the plant. Then, the second are hygienic safety of the storage water quality in the roof, etc. In this study, the water quality deterioration by the storage in making rainwater to be water source was measured, and the proper management technique was examined. To begin with, the Legionella was detected in 104CFU/100mL order as a result of storing the rainwater for 4 months. From this result, disinfection examination by chlorination, ultraviolet disinfection method and ultraviolet ray and chlorination-combined use was carried out for the water quality of the storage tank. The disinfection examination result showed appropriate disinfection method of the Legionella done the survival in the water quality of the storage tank.