Further work is required to obtain the optimum cultural conditions for the utilization of glycerol and yield of ethanol by this E. aerogenes S012.
It was found that the optimum condition was at HRT 1 h with HPR of 88.73 L H2/L/d, substrate utilization of 92.95% and yield of 1.37 mol H2/mol hexose.
Agricultural residues contain large amounts of hemicellulose, and the utilization of xylose is thus a plausible way to improve the concentration and yield of ethanol during fermentation.
We found in this work that removal of salt by acidification improved R-glycerol utilization and ethanol yield by E. aerogenes ATCC 13048.
Thirdly, more light can be scattered or reflected in the porous and incompact structure of the TiO2/SrTiO3 network film, so the utilization yield of the irradiated light would be improved [25].
Compared with bulk reaction, the photon propagation distance within this film was greatly shortened, and the possibility of light absorption by solution was correspondingly reduced, increasing the light utilization yield of photocatalytic system.
This strategy has also been demonstrated in a previous experimental study whereby the deletion of iclR, a repressor of the glyoxylate bypass operon aceBAK [ 30], increased glyoxylate pathway utilization and enhanced succinate production yield of more than eight fold [ 31].
An understanding of the toxic effects of compounds found in hydrolysate is critical to improving sugar utilization and ethanol yields in the fermentation process.
Up to 77% xylose utilization and 85% of theoretical ethanol yield (based on total sugars), giving a final ethanol concentration of 45 g L-1, were obtained in fed-batch SSF at 10% WIS when prefermentation was applied.
Albeit it is an underestimated feedstock, its efficient utilization can yield billions of gallons of transportation fuel.
