Between December 2018 and February 2019, we installed and used eight family-scale urine dehydrator prototypes in Uppsala. At the end of this period, we managed to produce 40 kg of dry fertiliser (which our collegues in France call “granurin”) with a nitrogen content of 10%. We thus managed to dry nearly 500 L of urine, which is what an average person urinates in a year. This fertiliser is now being applied and tested as part of the AGROCAPI project, where the intent is to ‘study the agronomic valorization of products resulting from urine source separation’. The trials are being carried out in France by Tristan Martin and colleagues at the Institut National de la Recherche Agronomique (INRA).
Blog from the Environmental Engineering Research Group at SLU