NOVELTY - Processing of organic waste material involves non-oxidative thermal distillation and decomposition.    USE - For processing organic waste material to remove and recover hazardous and useful materials, e.g. hydrocarbons and water.    ADVANTAGE - The invention efficiently removes water and hydrocarbons by vaporization from solid waste material through desorption, at lower cost, and without entraining a high volume of solid particulates in the vapors removed.    DETAILED DESCRIPTION - A desorption method for processing organic waste material involves (a) a conveying waste material into a first drum having a first gas extraction port; (b) sealing the waste in the first drum; (c) heating the waste material in the first drum to a preselected first temperature sufficient to volatize a component(s) of the waste material and form a gas; (d) extracting the gas from the first drum through the first gas extraction port; (e) conveying the waste material remaining after heating step into a second drum having a second gas extraction port; (f) sealing the waste material in the second drum; (g) heating the waste material in the second drum to a second temperature greater than the first temperature to volatilize a component of the waste material and form a gas; and (h) extracting the gas from the second drum through the second gas extraction port.    INDEPENDENT CLAIMS are included for the following:    (a) An apparatus for treating waste material and recovering selected products comprising a first drum (20) having a first interior volume and a first gas extraction port (104), a second drum having a second interior volume smaller than that of the first and having a second gas extraction port, a heater (27) for heating the waste material in the first drum, a conveyor (100) for moving the unvolatized waste material out of the first drum, a heater for heating the waste material in the second drum, and a conveyor for moving the unvolatized waste material out of the second drum; and    (b) A method for removing vapors generated in the desorption drum by positioning an eductor scrubber (50) adjacent to a gas extraction port and injecting a motive fluid into the eductor scrubber to draw vapors from the desorber drum into the eductor scrubber.    DESCRIPTION OF DRAWING(S) - The figure shows a schematically shows a single stage desorption apparatus.    First drum (20)    Heater (27)    Hot gas generator (30)    Eductor scrubber (50)    Conveyor (100)    Gas extraction port (104)