Cottecttonr Screentng arid Cliaiaclei izalion of Microalgae by

Process

Cost Category

PVO Ester Fuel Gasoline Ethanol

Capital costs ($10 )

Main process unit

36.7

109.0

58.2

113.0

Glycerol by-product unit

17.7

Methane by-product unit

33.0

33.0

27.9

26.3

Total

69.7

159.7

86.1

139.3

Operating costs (SiO^/yr)

Raw materials

192.3

210.2

192.1

193.1

Electric power

3.4

3.7

4.0

2.1

Wat»®

0.2

1.3

0.2

2.3

Steam

4.1

3.5

4.1

14.2

Labor, maintenance, taxes

92.1

31.9

7.8

16.5

Depreciation

7.4

16.4

8.9

13.9

Return on investment

3.4

5.1

3.4

4.0

Total (gross)

302.9

272.1

220.5

246.1

Credits from product salesc ($106/yr)

Carbon dioxide

(7.2)

(7.2)

(4.8)

(10.8)

Water

(0.3)

(0.3)

(0.3)

(0.2)

Nitrogen

(3.1)

(3.1)

(2.7)

(2.3)

Methane

(33.1)

(33.1)

(28.8)

(16.5)

LPG

0.0

0.0

(32.4)

Diesel

0.0

0.0

(22.1)

Glycerol

0.0

(59.2)

0.0

Subtotal (credits)

(43.7)

(99.8)

(91.1)

(29.6)

Net operating cost

259.2

172.3

129.4

216.3

Fuel production®

107.5

104.8

76.7

78.9

Main product cost ($/gai)

2.40

1.65

1.70

2.75

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