Ultraviolet reactors having an ultraviolet light source for treating a fluid are disclosed. In one embodiment, a reactor is disclosed which includes a vessel having an inlet for receiving fluid and an outlet for discharging fluid. The vessel further includes a plurality of segmented baffles. The baffles further include a partial circumferential edge section that terminates in a vertical edge section to form right and left segmented baffles. The left and right segmented baffles are arranged in an alternating pattern in the vessel to provide plug flow and enhanced radial mixing.本發明揭示用於處理流體之具有紫外線光源的紫外線反應器。在一實施例中,揭示反應器,包括一容器,其具有一用於接收流體之入口及一用於排放流體之出口。此容器另包括複數個分段式擋板。此諸擋板另包括一部分周圍邊緣段,其終止於一垂直邊緣段中以形成右及左分段式擋板。此諸左及右分段式擋板在該容器中以交替的形態配置,以便提供塞流及經增強之徑向混合。100...紫外線反應器102...容器104...腔室106...第一UV燈108...第二UV燈110...第一端112...第二端114...第一擋板116...第二擋板118...入口120...出口122...縱向軸線