TABLE H.10 Carbon Inputs to Biomass Refining, Including Transportation of Biomass

Source of Input (g CO2 eq/L)a

Corn Ethanol

Cellulosic

Transport of feedstock to biorefinery

49

51

Primary energy

Diesel

5

Coal

885

Natural gas

365

Electricity

Biomass

Capital (plant, equipment)

8.8

29

Process water

25

19

Effluent restoration (BOD at PWTPsb)

20

20

Transportation of chemicals to plant

Total biorefinery phase

1,353

124

Coproduct credits

525

106

Total biorefinery phase accounting for coproduct

828 g CO2 eq/L

18 g CO2 eq/L

Conversions:

 

 

Initial value

 

 

[0.4/0.4]/0.38 L/kg

828 g CO2 eq/L

18 g CO2 eq/L

[8,746/8,389]/13,450 kg/ha

~331.2 g CO2 eq/kg

~6.84 g CO2 eq/kg

0.405 ha/acre

~2,896,675 g CO2 eq/ha

~91,998 g CO2 eq/ha

0.001 kg/g

~1,173,153 g CO2 eq/ac

~37,259 g CO2 eq/ac

 

~1,173 kg CO2e/ac

~37.3 kg CO2 eq/ac

TOTAL (agriculture phase + biorefinery)

4,307 lb CO2 eq/ac

964 lb CO2 eq/ac

Conversion per ton: (assume 4 tons/acre)

241 lb CO2 eq/ton

aUnless noted otherwise.

bBiochemical oxygen demand of effluent at wastewater treatment plants.

Source: Farrell et al., 2006.



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