Abstract: The scale-up of photocatalytic reactors for the wastewater treatment is still a big challenge though photocatalytic processes involving TiO₂ semiconductor particles under UV light illuminations, and such method has shown to be potentially advantageous and useful in the treatment of wastewater such as dye effluents. In this review, the lessons and experience we obtained in the development of photocatalytic reactors for wastewater treatment including lignite gasification wastewater and wastewater at expressway service area are given. The wastewater treated by the skid-mounted photocatalytic reactor can reach the standard of drain.