Greenhouse gas and energyassessment of the biogas from co-digestion injected into the natural gas grid: A Swedish case-study including effects on soil properties

摘要: In this study, a large, farm-based, co-digestion plant in southern Sweden, using manure and various food industry wastes is investigated concerning its use of energy emissions greenhouse gases from life cycle perspective based on measured, site-specific data. The biogas upgraded utilized as vehicle fuel, distributed via the natural gas grid. case-study also includes novel approach which potential changes soil compaction carbon levels are assessed, farm-specific conditions, when digestate replaces mineral fertilizer. An additional objective to identify technical improvements leading further GHG reductions, cost such measures. According case-study, produced waste modern could reduce by approximately 90% compared conventional fossil fuels. corresponding input:output ratio calculated be about 25%, where electricity process, upgrading pressurisation dominating input. Finally, several possible were identified. economic prerequisites specific varied, profitable business unprofitable socio-economic point-of-view. (C) 2014 Elsevier Ltd. All rights reserved. (Less)