Life cycle impacts of ethanol production from spruce wood chips under high-gravity conditions

Table 3 Reduction in the environmental impacts due to on-site enzyme production

Process configuration	Reduction of environmental impacts
Process configuration	GWP [%]	EP [%]	AP [%]	POCP [%]
Base case	59	53	32	67
Highest yield at 20 % DM	62	68	44	77
Highest yield at 30 % DM	65	69	51	85

Impacts of on-site enzyme production were compared with the impacts of off-site enzyme production. This was done for the: a. base case (detoxification with \({\mathrm{Na}_2\mathrm{S}_2\mathrm{O}_4}\), PSSF at 12 % DM and 30 \(^\circ\)C); b. process configuration with the highest yield at 20 % DM (washing of slurry, PSSF at 40 \(^\circ\)C); c. process configuration with the highest yield at 30 % DM (adaptation of yeast + extra nutrients, SHF at 30 \(^\circ\)C)

ISSN: 2731-3654