anaerobic digestion animal biodegradability prediction biodegradation biodrying biogas carbon dioxide compost composting digestate district heating eco-industrial park electric power energy european union food waste global warming green waste greenhouse gas human waste incineration landfill landfill directive landfill diversion list of waste management concepts manure mechanical biological treatment methane municipal solid waste paper plant radioactive waste recycling regiving reuse sanitary sewer sewage slaughterhouse waste waste waste-to-energy waste collection waste hierarchy waste legislation waste management waste sorting waste treatment waste types