Data from: Effect of yeast addition on the biogas production performance of a food waste anaerobic digestion system

Food waste contains numerous easily degradable components, and anaerobic
digestion is prone to acidification and instability. This work aimed to
investigate the effect of adding yeast on biogas production performance,
when substrate is added after biogas production is reduced. The results
showed that the daily biogas production increased 520 ml and 550 ml by
adding 2.0% (VS) of activated yeast on the 12th and 37th day of anaerobic
digestion, respectively, and the gas production was relatively stable. In
the control group without yeast, the increase of gas production was
significantly reduced. After the second addition of substrate and yeast,
biogas production only increased 60 ml compared with that before the
addition. After fermentation, the biogas production of yeast group also
increased by 33.2% compared with the control group. Results of the
analysis of indicators, such as volatile organic acids, alkalinity, and
propionic acid, showed that the stability of the anaerobic digestion
system of the yeast group was higher. Thus, the yeast group is highly
likely to recover normal gas production when the biogas production is
reduced, and substrate is added. The results provide a reference for
experiments on the industrialisation of continuous anaerobic digestion to
take tolerable measures when the organic load of the feed fluctuates
dramatically.