The volume of biogas produced (0.080 Nm 3 /FU), conversely, is directed to the co-generator which theoretically allows the production of electricity (0.53 MJe/FU) and heat (0.76 MJt/FU). A 100% capture efficiency was assumed, with a 37%ηe and 53%ηt. The electricity, assumed to be sold to the national grid, is included in the model as avoided product. The heat produced is instead conveyed to the AD, in order to make it independent the natural gas grid. The heat excess is assumed to be dissipated into the atmosphere as heat waste. Environmental impacts of the co-generation and the credits associated to the avoided production of electricity are measured according to the Ecoinvent database. The environmental burdens associated to the limonene are calculated according to the inventory proposed by Santiango and co-workers. However, as anticipated in the LCIA, the production techniques may significantly alter the impacts associated to the solvent production. For this reason, the model has been accordingly modified substituting the limonene produced via hydrodistillation, with that extracted via cold pressing.