AbstractEthanol fermentation was carried out in an up‐flow attached‐bed (UFAB) continuous fermentor using different microorganisms, substrates, and attachment supports. WhenSaccharomyces fragiliswas attached to cellulose acetate to ferment deproteinized and concentrated acid whey, ethanol productivity as high as 6.9 g/(L.h), 10 times that of a batch reactor, was obtained in a continuous UFAB bioreactor. WhenZymomonas mobiliswas attached to vermiculite in a continuous UFAB bioreactor to ferment a 10 glucose feed, ethanol productivity as high as 105.7 g/(L.h) was achieved with a dilution rate of 3.6 h−1and an ethanol concentration of 29.
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