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Table 1 Description of co-product treatment methodologies for each scenario

From: Influence of corn oil recovery on life-cycle greenhouse gas emissions of corn ethanol and corn oil biodiesel

Process step I: Displacement II: Marginal III: Hybrid allocation IV: Process-level energy allocation
Corn farming and transport Allocated to ethanol Allocated to ethanol First allocated between DGS and energy products (i.e., ethanol and corn oil) using market value allocation. To calculate individual GHG burdens for the two energy products, energy allocation is used Allocated to ethanol, DGS and corn oil using energy allocation
Saccharification and fermentation Allocated to ethanol Allocated to ethanol Allocated to ethanol, DGS and corn oil using energy allocation
Ethanol separation and distillation Allocated to ethanol Allocated to ethanol Allocated to ethanol
Corn oil recovery Allocated to ethanol Allocated to corn oil Allocated to biodiesel
DGS drying Allocated to ethanol Allocated to ethanol Allocated to DGS
Biodiesel production Allocated to ethanol Allocated to biodiesel Allocated to biodiesel Allocated to biodiesel
Displaced DGS credits Attributed to ethanol Allocated to ethanol Not applicable Not applicable
Displaced biodiesel credits Attributed to ethanol Not applicable Not applicable Not applicable