method of the present invention employs heated air from oxidation chamber 20 of rto 5 this air is cooled by contact with ambient air stream aas and the resulting warm air is then mixed with inlet process stream ips heating the ips to a temperature sufficient to substantially eliminate the condensation of organic or inorganic compounds present within the air stream prior to directing it into the rto referring now to fig2 in a second method of the present invention air from oxidation chamber 20 of rto 5 is passed through indirect mixing heat exchanger 40 heat exchanger 40 is placed within the path of inlet process stream ips heating the ips to a temperature sufficient to substantially eliminate the condensation of organic or inorganic compounds present within the air stream prior to directing it into the rto referring now to fig3 in a third method of the present invention the outlet exhaust gases oeg from rto 5 are used to heat the inlet process stream ips for the rto this is accomplished by employing a duct within a duct the resulting heat exchanger preferably in the form of a concentric tube heat exchanger as shown is designated generally as 45 thus as the ips travels through inlet duct 50 in the direction of the arrows the oeg process streams travelling through outlet ducts 60 in the opposite direction are cooled conversely the ips travelling through inlet duct 50 is indirectly heated by the oeg process streams the oeg air streams from outlet ducts 60 are then blown by fan 30 to stack 80 once.