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Table 3 Products, major inputs and energy balances for the base case and the eight scenarios studied

From: A systems analysis of biodiesel production from wheat straw using oleaginous yeast: process design, mass and energy balances

 

Unit

Base case

DRY10%

DRY5%

LIPID60%

LIPID40%

SUGAR + 10%

SUGAR − 10%

TIME + 1

TIME − 1

Products

Biodiesel

MJ/kg biomass

4.02

4.02

4.25

4.58

3.40

4.02

4.02

4.02

4.02

Biogas

MJ/kg biomass

2.80

2.77

2.56

2.47

3.16

2.80

2.80

2.80

2.80

Excess electricity

MJ/kg biomass

0.52

−0.06

−0.04

0.55

0.49

0.64

0.38

0.32

0.73

Total energy

MJ/kg biomass

7.35

6.79

6.83

7.61

7.06

7.46

7.21

7.15

7.55

Major process inputs

Enzymes

g/kg biomass

11.9

11.9

11.9

11.9

11.9

11.9

11.9

11.9

11.9

Hexane

g/kg biomass

6.46

6.46

6.46

6.14

6.83

6.46

6.46

6.46

6.46

Methanol

g/kg biomass

12.5

12.5

13.2

14.2

10.6

12.5

12.5

12.5

12.5

Ammonia

g/kg biomass

13.0

13.0

13.0

9.9

16.5

13.0

13.0

13.0

13.0

Energy balances

NER

MJprim/MJproduct

0.37

0.42

0.42

0.35

0.40

0.37

0.38

0.38

0.36

EE

%

41%

38%

38%

43%

39%

42%

40%

40%

42%

FFRP

MJ/kg biomass

−5.74

−4.49

−4.66

−6.22

−5.21

−5.96

−5.48

−5.37

−6.12

Mass balances

Biodiesel

g/kg biomass

108

108

114

123

91

108

108

108

108

Biogas

g/kg biomass

50

50

47

44

57

50

50

50

50