TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The method further includes conveying the waste material remaining after the extraction step into a third drum having a third extraction port, sealing the waste material in the third drum, heating the waste material in the third drum to a third temperature greater than the second temperature to volatize a component of the waste material and form a gas, extracting the gas from the third through the third gas extraction port, and conveying the remaining waste material out of the third drum and into a solid cooling drum. The method further includes conveying the gas extracted from the drum(s) into an eductor scrubber that is positioned adjacent to one of the gas extraction ports. The gas extraction steps is accomplished by using an eductor scrubber attached to the gas extraction port of the drums. The suction chamber is cleaned by reciprocating a piston in the chamber. The heating step(s) includes collecting exhaust gas generated by a burner apparatus and conveying the collected exhaust gas into the drum(s).Preferred Condition: The first temperature is greater than 212degreesF and less than 650degreesF. The second temperature is less than 1500degreesF.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Materials: The second drum is made of a material that can withstand higher temperatures than that of the first.Preferred Components: The drum(s) includes an inner sleeve portion and an outer sleeve portion. The apparatus further includes a third drum includes a third interior volume smaller than the first interior volume, a heater for heating the waste material and a conveyor for conveying the unvolatized waste material out of the third drum. The third interior volume is less than that of the second. A conveyor is also included for conveying waste material into the drum(s) and having a screw component, an elongate shell housing the screw component, and a baffle attached to the shell and disposed at the end of the shell that is closest to the drum. The heater comprises a burner apparatus generating an exhaust gas and in which the waste material treating apparatus further includes a stack collecting the exhaust gas, a gas inlet in the drum(s) and a conduit conveying the exhaust gas through the gas inlet and into the drum for heating the waste material. The apparatus further includes a hot gas generator (30) conveying hot gas into the drums, an eductor scrubber having a suction chamber, and a plunger disposed within the suction chamber. The side surface of the plunger includes teeth for scrapping the suction chamber. The motive fluid is water or oil. The method of removing the vapors further includes cooling the vapors drawn into the eductor scrubber to a temperature below the boiling point of the water to remove water/oil from the vapors.