With the recent development of ultraviolet light emitting diodes (UV-LEDs), it is now possible to apply UV disinfection, previously used only for medium-to-large sized sewage treatment plants, Johkasou wastewater, a household wastewater system. However, known that coliforms have been inactivated by irradiation regain their activity after sunlight irradiation, etc. Therefore, in small Johkasou, ...

The effects of UV irradiation (254 m,u) on a cocooid blue-green alga Agmenellum quadruplicatum, Strain PR-6, have been examined in terms of the survival curve and measurement of short time photosynthetic rates. From study of survival evidence has been found for a strong photoreaotivation centered near 430 m/4&. Measurements of photosynthetic rate suggest that there is a correlation between deca...

The effects of UV irradiation (254 m,u) on a cocooid blue-green alga Agmenellum quadruplicatum, Strain PR-6, have been examined in terms of the survival curve and measurement of short time photosynthetic rates. From study of survival evidence has been found for a strong photoreaotivation centered near 430 m/4&. Measurements of photosynthetic rate suggest that there is a correlation between deca...