A cleaning module for cleaning sewer pipes including sewer liner, and other types of conduits. The cleaning module may comprise a single hydraulically propelled unit, wedge-shaped and selected to fit pipe size. Pipeline walls are scoured by the slurry agitation produced by hydraulic pressure jets in the module. Alternatively, the module is assembled in situ and the relative size of components is selected depending upon the diameter of the pipeline. The module may comprise a front unit and rear unit or a frame assembly and a drive assembly. The modules contain a motor, preferably a hydraulic motor. The motor drives flails, thereby disintegrating solid waste or generating and propelling a sludge slurry. The slurry scours the pipeline walls by cavitation and abrasion action. Also disclosed are systems for cleaning a sewage line section and methods of their use. A system for cleaning pipelines is described which utilities and recycles, as a solid waste transport medium, nearly one hundred percent of the extracted liquid waste. The mobile extractor and separator unit comprises a separator for separating sludge waste from liquid and particulate waste, and for separating liquid waste from particulate waste. The mobile extractor and separator unit of the present invention also employs gravity and a conveyor belt or screw auger to transport the sludge waste.