Table IIID Costs of microalgal biofuels production reference case

Summary of reference capital, operating, and allowable feedstock costs for microalgae fuel processing options. Of the five fuel options, the first four produce a high (30%) lipid biomass; the last (ethanol) fermentable carbohydrate, representing

BftÎyi 3 % of biomass weight. v Not including 'alga fcluding'algae feedsock ? Process and cooling waters

? By-product prices: $0.07/m for CO2 (captive use only), $7.40/MMBtu for methane, fuel gas, or LPG, and $13.30/MMBtu diesel fuel (exports) ? Main product prices: $7.40/MMBtu for methane, fuel gas, LPG, and $ 16.60 ($ 1.75/gal) for gasoline and diesel fuel, $ 1.20/gal for ethanol and $1.75/gal for biodiesel (methyl ester) or PVO

? The value ($/t) of the algal feestock in producing the main and coproduct mixes. For example, for the ester fuel case, the facility would produce 2.1 million gallons of biodiesel in addition to some 600,000 GJ of methane and

Process internally)

Process internally)

Cost Category

PVO

Ester Fuel

Gasoline

Methane

Ethanol

Capital Costs ($1Q6)

Main process unit

2.73

8.13

5.15

3.91

6.21

Glycerol by-product unit

1.32

_

Methane by-product unit

3.27

3.27

2.92

__

3.50

Subtotal

12J1

or

33T

TJl

Operating Costs ($103/yr)

Saw materials

13

210

S

14

22

Electric power

1«!

137

187

159

Water0

13

2S

10

21

35

Steam

n

«

70

0

m

Labor, maintenance, taxes

H SI

13M

777

485

897

Depreciation

1313

S if»

m

1015

Return on investment

329

m

312

335

410

Subtotal (gross)

2M

353!

2ÎSS

(1553

2SÏ5

Credits from Product Sales2

<$103/yr>

Carbon dioxide

(438)

(»38)

(307)

(700)

(m)

Water

(13)

(13)

(il)

(15)

(13)

Nitrogen

(223)

(223)

(199)

(262)

(228)

Methane

(2026)

(2025)

(1540)

0

(2585)

LPG

0

0

(¡70)

0

0

Diesel

0

0

(388)

0

0

Glycerol .

0

(782)

0

0

0

Main product

(2«SM

(2«2)

(2363)

(3239)

(732)

Subtotal (credits)

OTP)

05535

03T3R

(5TT55

Net operating cost®

mm

(2367)

(3190)

(273»)

(1573)

Algae,feed requirement (lip t/yr)

33

33

33

33

33

Allowable algae cost ($/t)

85

72

97

S3

Table III.D.4. Costs of microalgae biofuels production: attainability cases.

(Source: Neenan et al. 1986.) Summary of Attainable Capital and Operating Costs for Fuel Processing Options.

V.A. SERI/NREL/DOE REPORTS AND PUBLICATIONS V.B. ADDITIONAL REFERENCES V.C. PATENTS

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