Environmental systems analysis of biogas systems—Part II: The environmental impact of replacing various reference systems

摘要: This paper analyses the overall environmental impact when biogas systems are introduced and replace various reference for energy generation, waste management agricultural production. The based on Swedish conditions using a life-cycle perspective. included different combinations of raw materials final use produced (heat, power transportation fuel). A general conclusion is that normally lead to improvements, which in some cases considerable. often due indirect benefits changed land handling organic products (e.g. reduced nitrogen leaching, emissions ammonia methane), exceed direct achieved fossil fuels replaced by carbon dioxide air pollutants). Such seldom considered evaluated from an point view. can, however, vary significantly factors such as utilised, service provided system replaced.