Table 8 Operating costs of DOE open system per hectare

C02 (at $0.4706/kg)*

246,400 kg

115,956

N, as NH3 (at $0.25/kg)

5,936 kg

1,484

P, as Superphosphate (at $0.90/kg)

560 kg

504

Fe, as FeSO4 (at $0.50/kg)

560 kg

280

Flocculant (at $5/kg)

224 kg

1,120

Power (at $0.05883/kW h)

Mixing

10,729 kWh

631

1 Harvesting

1,771 kWh

104

2 Harvesting

5,729 kWh

337

Water Supply

8,750 kWh

515

Nutrient Supply

521 kWh

31

Buildings

1,042 kWh

61

Other

Salt Disposal (at $0.067/kg)

168,000 kg

11,256

Maintenance

511

Labor

562

Capital costs (Table 7)

14,417

Total yearly operating costs

147,769

Biomass costs ($/t)

1,319