Abstract:
The development of medium for the production of Seccharomyces cerevisiae SC90
inoculum for the industrial ethanol production. The cultivation was carried out with three medium
formulae for 24 h. It was found that the BUU 2D medium, composed of molasses, yeast extract,
(NH4
)2SO4
, K2HPO4
, KH2PO4
, and MgSO4
∙7H2O at 40, 5, 3.6, 3 and 1 g/l respectively, with
inoculum at 1X107
cell/ml, 35°C, 200 rmp agitation rate, gave the maximum yeast cell growth at
a concentration of 364X106
± 2.89 cells/ml. The BUU 2D gave 4.7 times higher efficacy than that
of the classical formula of the Liquor disillery organization. The BUU 2D medium was selected
for the scale up 5 L, 75 L and 750 L (Reactors of ofour pilot plant essay). Then, BUU 2D
medium culturing molasses with at 2x condition pH 5.5, at 35°C, 200 rpm agitation rate, pH 5.5,
2vvm aeration rate. The results show that cultivation in 5-L fermenter at and feed that at 15 h,
24 hours gave a cell number concentraton 330 X106
± 0.89 cells/ml is sutable. The cultivation
in 75-L fermenter at 15 h, gave the maximum yeast cell growth at a concentration of 410X106
±
0.89 cell/ml. The inoculum of 75 L. above was use for fulther 750 L cultivation. giving the
maximum yeast cell growth at a concentration of 360X106
± 10.61 cell/ml. There results led
department to the industrial experiment of Liquor organization. The cultivation were done using
BUU 2D-adaptaive media, composed of molasses 80 g/l and (NH4
)2SO4 10 g/l in a 6 L fermenter
using at the medium for theStarter-A 500-L fermenter (waking volume of 300-L), with 5% v/v
inoculum, gave the maximum yeast cell growth at a concentration of 364X106
± 2.89 cell/ml at 16
h. After that, the medium above was reactored to the Starter-B 6,000-L fermenter (waking volume
of 3,000-L) at5% v/v inoculum. The rusult show that the Starter-B cell number at a concentration
of 433X106
± 40.72 cell/ml at 16 h. Compared to the normal getterthan, it could produce cells
only 4.83X106
± 40.72 cell/ml. The production cost consideretion, developments of medium and somephysical factors resulted 50 times higher efficacy than the classical method. Therefore, the
developmentof inoculcm production medium can reduce the cost and increase the efficacy for
industrial ethanol production.