Miljöbedömning av olika behandlingsmetoder för organiskt hushållsavfall, slakteriavfall och flytgödsel

Organic material used for biogas production can also undergo other treatments. The emissions and impact from the different treatments are evaluated in this environmental assessment, with a focus on energy and climate. The materials included in the study are organic household waste, slaughterhouse waste and liquid manure. Other than biogas production, the possible treatments for organic household waste and slaughterhouse waste are incineration and composting, and for liquid manure storing and spreading. The analysis is based on data and information from current and relevant literature, and relates to the conditions in the Swedish energy system. To assess the environmental impact from the different treatments, seven of the sixteen environmental goals set by the Swedish government as a guide to nationwide environmental strategies are used. The analysis is done through a method that merges quantitative and qualitative information, as data is not always available. The conclusions from the study are that for all three of the studied materials, biogas production is the best treatment concerning energy and climate. Regarding organic household waste and slaughterhouse waste, the next best treatment is incineration and the poorest is composting. Liquid manure can only be treated with two different methods and therefore storing and spreading is the least preferable. Further studies are needed to make a complete environmental assessment concerning the goals that relate to other issues than energy and climate