Outdoor water treatment apparatus to kill bacteria with ultraviolet light
AssigneeThe University of Tokushima
InventorsAkira Takahashi, Yohsuke Kinouchi, Masatake Akutagawa
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Abstract
Bacteria in water 9 exposed outdoors are effectively killed with ultraviolet (UV) light by suppressing post-treatment increase in the bacteria population due to photoreactivation. The apparatus shines UV light on the water 9 to kill bacteria and has UV light emitting diodes (LEDs) 1 that emit UVA light with a primary emission peak of 320 nm-400 nm. The antibacterial action of the UVA light emitted by the UV LEDs 1 prevents proliferation of bacteria in the disinfected water 9 due to photoreactivation.
Claims21
An outdoor water treatment apparatus to kill bacteria with ultraviolet (UV) light comprising:
- UV light emitting diodes (LEDs) that emit UVA light with a primary emission peak of 320 nm-400 nm;
- and
- UVC light sources that irradiate UVC ultraviolet light;
- wherein UVC light source output is lower than UV LED output;
- and
- bacteria in the water, which is outdoors, are killed by combined exposure to both UVA ultraviolet light emitted by the UV LEDs and UVC ultraviolet light to suppress bacteria proliferation in the disinfected water due to photoreactivation.
Dependencies are inferred from the claim text.