Advanced oxidation processes (AOP) were expected to be powerful water treatment techniques. We aim to develop the AOP that mainly used ultraviolet irradiation for treatment of the refractory organics and the disinfection of pathogenic microbes. It is presumed that the generation of hydroxyl radical is the key factor for treatment performance in AOP. In this research, we firstly examined the method to quantify the hydroxyl radical generation, then the obvious generation of hydroxyl radical was observed in a photocatalyst/ultraviolet irradiation. And the second, we examined the method to detect biological activity of the pathogenic protozoan Cryptosporidium, that caused serious outbreaks in the world wide. We revealed that Cryptosporidium could be inactivated by the ultraviolet irradiation.
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