Beside the financial benefits, the described process has also a substantial positive impact on environment. Originally, the total annual GHG emissions reached about 4.5 Mio kg CO2 equivalent. These included emissions generated from the heat supply (combustion of natural gas), the transportation to the rendering plant (combustion of gasoline) and the energy needed to treat the disposed waste material (combustion of natural gas). Through the realization of the new concept the amount of GHG emissions could be greatly reduced (79%; seeFig. 12). An additional 85 Mio kg CO2 are saved per year including the amount of animal by-products derived from the cattle slaughter unit also processed in the anaerobic digestion unit.