Abstract: A system and method for removing volatile organic compounds (VOC's) from a circulating airstream utilizes first and second adsorption beds and first and second adsorption paths alternately coupling the circulating airstream to the respective first and second adsorption beds for removing VOC's during adsorption cycles. First and second desorption loops alternately couple a desorption inert gas through the respective first and second adsorption beds for desorption and regeneration and for recovering VOC's in a VOC condenser. System parameter sensors are distributed in the first and second adsorption paths and first and second desorption loops for sensing system parameters. A programmable controller is coupled to the system parameter sensors, to flow control valves, and to the inert gas heater for controlling the system in response to sensed system parameters. The system parameter sensors include a variety of temperature, O.sub.2, VOC, pressure, and differential pressure sensors.