A system for treating emissions from a vehicle includes an ozone generator, a first holding tank, and an exhaust vent. The first holding tank is downstream from the ozone generator and defines a volume for liquid waste beneath a void space. The exhaust vent is downstream from the first holding tank and outside of the vehicle. A supply conduit connects the ozone generator to the void space of the first holding tank. An exhaust conduit connects the void space of the first holding tank to the exhaust vent. The ozone generator, supply conduit, void space of the first holding tank, exhaust conduit, and exhaust vent establish a thermal driving head from the ozone generator through the void space of the first holding tank to the exhaust vent.