Utilisation of digestate from biogas plants as biofertiliser

a report by IEA Bioenergy Task 37

Greenhouse gas emissions, nitrate and phosphate enrichment of inland and coastal waters and deteriorating air quality are major issues throughout the world.  While there is a growing global demand for more efficient heat, power, transport and food production, all of these processes are still largely reliant on fossil fuels.  Within agriculture the manufacture and use of inorganic fertiliser is recognised to give rise to particular issues, arising both from fossil fuel use and from nitrous oxide emissions. Many governments are now giving a high priority to lowering pollution from all of these factors.

This brochure describes how Anaerobic Digestion of manures and other organic residues can be used to produce both renewable energy and organic fertiliser – as biogas and digestate.

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