no additional ethanol has to be purchased. Other important but much smaller input streams are microorganisms such as yeast and chemical compounds such as catalysts and nutrients. As the
main outputs, four products are generated with the following amounts per dry tonne of wood: 0.10 t of polymer-grade ethylene, 0.16 t of organosolv lignin, 130 Nm3 (0.10 t) of biomethane
and 0.45 t of hydrolysis lignin. Other outputs are the exhaust gases that mainly occur during the alcoholic fermentation and biogas digestion and upgrading and large quantities of waste water which accumulates in the biogas plant, with the largest share from the pre-treatment.