 Biodegradable waste can be used for composting or a resource for heat, electricity and fuel by means of incineration or anaerobic digestion.Swiss "Kompogas" and the Danish "AIKAN" process are examples of anaerobic digestion of biodegradable waste.While incineration can recover the most energy, anaerobic digestion plants retain nutrients and make compost for soil amendment and still recover some of the contained energy in the form of biogas.