Abstract: A method and apparatus for photodegradation of pollutants using a modular baffled wastewater purification tank. Baffle surfaces are lined with a photocatalyst film and arrange in such a way to provide liquid turbulence and increased time for the photodegradation processes to occur. For certain embodiments, after water treatment, the baffle walls may be washed, regenerated, and re-introduced in the water treatment tank. The water treatment tank includes a series of UV lamps placed on the top of the photocatalytic chamber. Because of the modular design of the baffled purification system, the water treatment and the change of baffle pads can take place singly or simultaneously.