When a non negligible concentration of CH4 is detected in CP1, CP2 and SP1 air tests, a decrease in emissions could be induced by turning the wastes and checking correct aerator function to improve oxygenation of the organic mass (Sang-ArunandKim Heng, 2011). It is preferable to improve bio-filter action in order to reduce ammonia (NH3), volatile organic compounds (VOC) and CH4 emissions, although N2O may be generated during bio-filtration
significantly reduce CO2 emissions along the entire fuel production supply chain (see e.g. Patrizi et al., 2013). Moreover, the use of biogas recovered from landfills determines zero GHG emissions, since the CH4 and N2O released are insignificant, while CO2 is biogenic (IPCC, 2006).