2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
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50.45
57.86
65.26
72.66
80.08
0.50
0.88
1.25
1.62
2.00
0.50
0.88
1.25
1.62
2.00
Ethanol production (g/l)
KH
2
PO
4
(g/l)
(NH
4
)
2
SO
4
(g/l)
(A)
50.45
57.86
65.26
72.67
80.08
0.50
0.88
1.25
1.62
2.00
0.30
0.72
1.15
1.57
2.00
Yeast extract (g/l)
Ethanol production (g/l)
(NH
4
)
2
SO
4
(g/l)
(B)
41.38
51.09
60.79
70.51
80.21
0.50
0.88
1.25
1.62
2.00
5.00
8.75
12.50
16.25
20.00
Inoculum size (%)
Ethanol production (g/l)
(NH
4
)
2
SO
4
(g/l)
(C)
51.33
58.58
65.84
73.09
80.35
0.50
0.88
1.25
1.62
2.00
0.30
0.72
1.15
1.57
2.00
Yeast extract (g/l)
Ethanol production (g/l)
KH
2
PO
4
(g/l)
(D)
51.32
58.58
65.84
73.10
80.35
0.50
0.88
1.25
1.62
2.00
5.00
8.75
12.50
16.25
20.00
Inoculum size (%)
Ethanol production(g/l)
KH
2
PO
4
(g/l)
(E)
49.92
57.55
65.18
72.80
80.43
0.30
0.72
1.15
1.57
2.00
5.00
8.75
12.50
16.25
20.00
Yeast extract (g/l)
Inoculum size (% )
Ethanol production (g/l)
(F)
Fig. 1. Surface plot of interaction effects of each
parameter on ethanol concentration.
