A method for reducing biological and/or chemical contaminants within a feed fluid stream includes in one embodiment the following steps: a) introducing the fluid stream into a cold pass of at least one recuperator; b) optionally heating the feed fluid stream using a heater; and c) introducing the feed fluid stream into a compressor, and compressing the fluid stream to an elevated pressure, resulting in heating of the fluid stream to an elevated temperature, thereby producing a decontaminated fluid stream.