UV reaction apparatus for treating waste liquid caused by system decontamination in nuclear power plant

A UV reaction apparatus for treating organic waste liquid caused by system decontamination in a nuclear power plant comprising:

• a UV irradiation unit for irradiating UV light as a bar-shaped body;
• and
• a transit unit accommodating the UV irradiation unit therein, and for passing the organic waste liquid to be irradiated with the UV light,
• wherein the transit unit comprises,
• an input unit, into which the organic waste liquid is input,
• a discharge unit, through which the organic waste liquid is discharged, and
• an intermediate unit located between the input unit and the discharge unit in a height direction, and in which the UV irradiation unit is located,
• wherein a plurality of piece-shaped partition wall units are provided on an inner circumferential surface of the intermediate unit,
• a separation state in the height direction between individual piece-shaped partition wall units of the plurality of piece-shaped partition wall units is arranged so as to gradually narrow in a direction from the input unit towards the discharge unit.