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No longer of use to the body that excretes it, urine is getting a second life in the form of fertiliser thanks in part to Swiss engineers. The Swiss Federal Institute of Aquatic Science and Technology (Eawag) has teamed up with specialists in South Africa to convert human urine into fertiliser.
“We treat the urine and extract the nitrogen, phosphorus and potassium in a powder form. Our idea at the moment is to granulate this powder so that we have granules like normal fertiliser, which can be spread on the fields,” explained Eawag process engineer Kai Udert.