Indonesia has wide palm
oil plantation which produce Empty Fruit Bunch (EFB) waste around 32 million
tons per year. EFB is a potential material for bioethanol through pretreatment,
saccharification, and fermentation. Fermentation has important role in
bioethanol production because this process will convert glucose into
ethanol. The most common microorganism
used in fermentation process is
Saccharomyces cerevisiae. But, the use of S. cerevisiae in bioethanol fermentation using lignocellulosic
hydrolysate have a problem that microorganisms cannot grow well. This is due to
the presence of inhibitor in the hydrolysate. Solution for this problem is
using S. cerevisiae which cultivated
on hydrolysate media that will be used in the fermentation (in this case EFB).
This research will investigate cultivation of S. cerevisiae on EFB hydrolysate, to obtain the optimum operating
conditions such as aeration and nutrients. Fed-batch system is used for
cultivation. Optimum condition are determined after analyzing cell number and
ethanol yield from dried S. cerevisiae.
Optimum condition for cultivation are 1 v/v per min aeration and glucose 5 g/L
which produce ethanol yield 24%. We also scale-up the dried yeast into 43.7 g
and need a cost Rp 19,958/g which is more expensive than commercial yeast
