Therefore, it was clear that there was no effect of gas stripping with N2 gas on ethanol fermentation. However, almost 3.4 times concentrated ethanol was achieved in the condensate due to gas st the condensate due to gas stripping. Therefore, the advantage of such a system is that the product stream contained a highconcentration of ethanol and the recovery of ethanol from the product stream would be much more economical than the typical concentration achieved in the broth (Qureshi et al., 2012).