Bioethanol and biodiesel have been championed as sustainable sources of energy in replacing fossil fuels. Biofuels can be produced from agricultural products and wastes. Bioethanol shows particular promise: it possesses lower emissions of volatile organic compounds and higher specific energy and heat of vaporization than fossil fuels.
By Matthew Hood
Due to the overutilization of fossil fuels in the past, concerns are being raised regarding their exhaustible nature and their negative impact on the environment.
There have been many attempts over the last few decades to develop new processes that do not have the negative features or fossil fuels but are commercially practical. Because bioethanol and biodiesel can be produced from agricultural products and wastes, they have attracted attention because of their huge and diverse raw material availability.
Compared to fossil fuels, bioethanol has numerous advantages such as a lower emission of volatile organic compounds. Unfortunately, current production techniques have displayed relatively low productivity with the fermentation step of the agricultural waste requiring a vast increase in efficiency to be commercially viable.
Fermentation is dependent on the type of microorganism strain, the type and volume of the bioreactors, the type and composition of culture media and proper nutrients, and the pH and temperature of the fermentation media.
In a recently published article published in the journal Green Processing and Synthesis, the authors modelled bioethanol production to study the overproduction of bioethanol via submerged fermentation using the yeast strains Saccharomyces cerevisiae. Using the values of their experiments the authors generated a general model with high coefficient of determination values to predict bioethanol concentrations obtained using both yeast strains.
It was concluded that an effective method to predict, model, and optimize bioethanol production by manipulating the process variables was achieved. The influence of the interaction of the substrate and the inoculum percentage on bioethanol production was remarkable for two selected (industrial and traditional bakery) strains of yeast in order to maximise the productivity.
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Reza Shaghaghi-Moghaddam, Hoda Jafarizadeh-Malmiri, Parviz Mehdikhani, Reza Alijanianzadeh, Sepide Jalalian: Optimization of submerged fermentation conditions to overproduce bioethanol using two industrial and traditional Saccharomyces cerevisiae strains. 12.04.2018