Prithvi Simha, Björn Vinnerås, and Jenna Senecal The idea behind it is rather simple. Fresh urine is collected from urinals or specially designed toilets and channelled into a dryer, where an alkalising agent, such as calcium or magnesium hydroxide, raises its pH. Any water in the now alkaline urine is evaporated and only the nutrients… Continue reading We found a way to turn urine into solid fertiliser–it could make farming more sustainable