Patent ID: 7063794

Claim:
A water treatment apparatus comprising: an ultraviolet radiation unit radiating ultraviolet light; an ultraviolet radiation part having an elongated tubular configuration, an internal surface, and receiving therein said ultraviolet radiation unit, said ultraviolet radiation unit being spaced from said internal surface of said ultraviolet radiation part for passage of wastewater between said ultraviolet radiation part and the internal surface; and an oxidizer mixing part that is disposed adjacent to, in fluid communication with, and upstream of said ultraviolet radiation part, wherein said oxidizer mixing part includes a minimum cross-sectional area part having an oxidizer suction port for drawing an oxidizer supplied from an oxidizer supply part into wastewater flowing in said oxidizer mixing part and past said oxidizer suction port, wherein the minimum cross-sectional area part is constricted to a first cross-sectional area, and a conical part having a tapered configuration that expands from said minimum cross-sectional area part to a large passage part having a cross-sectional area substantially the same as the cross-sectional area of said ultraviolet radiation part, wherein said ultraviolet radiation part has a diameter so that ultraviolet light radiated by said ultraviolet radiation unit has an intensity at said internal surface that is at least 30 W/m 2 .