The Water Sanitation and Hygiene Institute of India has developed a truck based mobile treatment unit that is able to treat fecal sludge on site.  The MTUs were evaluated in a technical paper authored by Aaron Forbis-Stokes.  The system was evaluated for operational and treatment performance while processing septage in the field at 108 sites in Tamil Nadu, India. This option is preferable as it does not require transport of the septage and avoids the common practice of illegal disposal of untreated septage into the environment.  Six mobile septage treatment units have been built to date using readily available filters and membranes (mesh fabric, sand, granular activated carbon (GAC), microfilter, ultrafilter) and installed on the bed of a small truck. The target application is emptying of septic or sewage holding tanks and concentration of suspended solids while generating a liquid that could be safely discharged.  With support from a USAID grant, the WASH Institute is working to scale the MTU solution as the preferred option over traditional vacuum trucks that discharge wastes into the environment.