There is a need to find new and sustainable nutrient sources for organic farming. Urban (food) waste can be a highly valuable source with low environmental impact and high recycling efficiency. This source can be used to compensate for the negative nutrient balances in organic farming. However, it must be treated to become hygienic, biologically stable, and easy to handle. Solution Anaerobic digestion of food and organic waste in a closed system produces fertiliser (digestates) and energy while avoiding greenhouse gas (GHG) emission. Storage in a closed system minimises losses of nutrients like nitrogen (N) and potassium (K). Outcome Anaerobic digestion maintains the ratios of nutrients in the feedstock by avoiding nutrient losses, thus enabling more balanced nutrient flows. Furthermore, the end product has a higher nitrogen fertiliser value than compost of the same amount of waste.
Ente che ha curato la pubblicazione
Kurt Möller Research Institute of Organic Agriculture (FiBL)