Abstract: A waste water clarification system is mounted on two road-transportable trailers which meet height and weight regulations and require no additional permitting. An elongate, low-profile clarifier having inclined plate packs supported therein utilizes the dropped bed portion of the first trailer to maximize the usable height to meet transport requirements while optimizing clarification of the waste water therein. Sludge produced in the clarifier section is thickened by gravity in a thickening section mounted on the first trailer. The thickened sludge is delivered to dewatering apparatus on the second trailer which also houses a lift tank for clarified water, chemical storage tanks and a control room for system control apparatus. Linear conveyors, in steep-walled troughs in the bottoms of the clarifier and thickening sections, slowly move the sludge to outlets therein, the speed being slow enough that a sludge blanket which develops in or above the troughs is not disrupted.