PROBLEM TO BE SOLVED: To perform ultraviolet irradiation stable even to change in water quality and water quantity.SOLUTION: A liquid treatment device includes: an ultraviolet irradiation part provided in the middle part of a pipe through which treatment target liquid flows, and irradiating the treatment target liquid with ultraviolet rays and a branch pipe which makes part of the treatment target liquid flowing through the pipe branch at the downstream side of the flow of the treatment target liquid of the ultraviolet irradiation part and flows the treatment target liquid to the ultraviolet irradiation part or the other ultraviolet irradiation part.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】水質及び水量の変化に対しても安定した紫外線照射を行う。【解決手段】液体処理装置は、処理対象液体が流れる配管の途中部に設けられ、前記処理対象液体に紫外線を照射する紫外線照射部と、前記配管を流れる前記処理対象液体の一部を、前記紫外線照射部の前記処理対象液体の流れの下流側で分岐させて、前記紫外線照射部または他の紫外線照射部へと前記処理対象液体を流す分岐配管と、を備える。【選択図】図1
