Default Data Sources for Parameters Used for CO 2 Emissions

Parameter Data source CO 2 Emissions from Prebake Cells (CWPB and SWPB) MP: metal production (metric tons Al) Individual facility records. NAC: net annual prebaked anode consumption per metric ton Al (metric tons C/metric tons Al) Individual facility records. S a : sulfur content in baked anode (percent weight) 2.0. Ash a : ash content in baked anode (percent weight) 0.4. CO 2 Emissions From Pitch Volatiles Combustion (CWPB and SWPB) MP: metal production (metric tons Al) Individual facility records. PC: annual paste consumption (metric ton/metric ton Al) Individual facility records. CSM: annual emissions of cyclohexane soluble matter (kg/metric ton Al) HSS: 4.0. VSS: 0.5. BC: binder content of paste (percent weight) Dry Paste: 24. Wet Paste: 27. S p : sulfur content of pitch (percent weight) 0.6. Ash p : ash content of pitch (percent weight) 0.2. H p : hydrogen content of pitch (percent weight) 3.3. S c : sulfur content in calcined coke (percent weight) 1.9. Ash c : ash content in calcined coke (percent weight) 0.2. CD: carbon in skimmed dust from Søderberg cells (metric ton C/metric ton Al) 0.01. CO 2 Emissions from Pitch Volatiles Combustion (VSS and HSS) GA: initial weight of green anodes (metric tons) Individual facility records. H w : annual hydrogen content in green anodes (metric tons) 0.005 × GA. BA: annual baked anode production (metric tons) Individual facility records. WT: annual waste tar collected (metric tons) (a) 0.005 × GA. (a) Riedhammer furnaces (b) insignificant. (b) all other furnaces CO 2 Emissions From Bake Furnace Packing Materials (CWPB and SWPB) PCC: annual packing coke consumption (metric tons/metric ton baked anode) 0.015. BA: annual baked anode production (metric tons) Individual facility records. S pc : sulfur content in packing coke (percent weight) 2. Ash pc : ash content in packing coke (percent weight) 2.5. [74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79156, Dec. 17, 2010]