Table IIID Costs of mieroalgal biomass production

Productivity: 67.5 mt/ha/yr for 40% extractable lipid biomass (162 bbl oil/ha/yr).

System Description: Twenty 40-ha growth ponds, harvesting by settling, with C

recycle from the digesters and use of either pure CO2 delivered to the site for

$22/mt, or generation of CO2 on site from coal at half this cost.

Cost Estimates: Figures in parenthesis next to capital and operating cost items refer to the factors used for the conservative and optimistic cases, respectively.

Maintenance, insurance, taxes, (6% and 4.8%, respectively), based on total capital costs, except for land ,and „working capital, which are also not depreciated. ROI (Source: Benemann et al. 1982a.)

(return on total capital) based on total capital, before taxes.

CAPITAL COSTS- $/ha

Water and Nutrient Supply Earthworks & Berms Paddlewheels Settling Ponds Centrifuges Oil Extraction CO2 Supply Electricity

Bldgs,» Offsites (102,7.52)* A&E and Contractors (202,102)* Contingencies <102 for both)* Land Costs

Working Capital (4, 3 months)* TOTAL CAPITAL COSTS

OPERATING COSTS $/ha /yr Labor and Overhead

Electricity (clO, 6.5/Kwhr)* 3,060 Water

C02 and Na2 CO3 1,115

Nutrients (N,P)

Maintenance, Insurance,Taxes 2,450 Depreciation (10 Yr,15 Yr.)* 4,100 Return on Investmenc(15Z,10Z)* 6,840 TOTAL OPERATING COSTS +E0I 197321

$/Barrel of oil 127

CONSERVATIVE CASE FLUE GAS PURE CO.

790 2,215 2,435 5,360 3,215

1,485

3.000 3^850

3,180

1,760

2,170

1,855

2,130 3,540 5,980

OPTIMISTIC CASE FLUE GAS PURE CO

3,200 930 1,460 2,090 2,305

1.335

1,450

1,115

1,210 1,685 2,78510,406

1,190

670 805 1,265 1,810 1,980

1.485 24,520

1,410 495 250

1,855

1,040 1,460 2,450 "OTT

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