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We researched the behavior of pathogenic microbes in a treated wastewater reuse system to acquire knowledge for establishing
new standards for the reuse of treated wastewater. Based on the results that showed occasional growth of total coliforms but
barely any growth of Escherichia coli in the supply tank, we found that the total coliform, which includes bacteria that also breed in the soil, etc., is not necessarily
suitable as the index bacteria for indicating pollution by excrement. We also clarified that it is possible to decrease the
heterotrophic plate count to a specified level in cases where combined residual chlorine is more than 0.3 mg/l, and that the
standard value for residual chlorine should be set at 0.3 mg/l or more. At the same time, we found that applying sand filtration
treatment to water used for toilet flushing, sprinkling and landscaping, and sand filtration treatment plus coagulation treatment
to water for recreational use lowers the annual risk of infection by Cryptosporidium to less than 10−4. The standard for viruses must be examined in the future because Noroviruses were sometimes detected even in the reclaimed
water, although we could not establish the standard at this time due to problems with the virus detection method. 相似文献