A rotating arm made from Teflons pipe perforated with slots for distributing hot gas in a
bioreactor was developed. The rotating movement helps spread the
hot gas to the slurry, which assists in mixing the suspended solids in the reactor. It was found that using Teflons parts and a low oxygen flue gas burner, the
system has the potential to lower the cost of heating bioreactors, aerobic or anaerobic.