COURTESY OF HUMAN KIDNEYS. Properly metabolised, human urine is a precious, well rounded fertilizer. The vitality that originates in our kidneys can be passed on across different kingdoms of life all the way to the plants we eat. Current food production relies on scarce resources of mineral phosphate and CO₂-derived nitrogen. In the long run this dependence on fossil input isn’t able to keep up with ever-growing demand.

The Nutrients Recovery focuses on urine because it concentrates 80% of all plant nutrients produced in the human body. Over the course of one year, a person releases on average 500 litres of kidney substrate with a stunning amount of soluble solids:

4.0L Nitrogen N
0.4L Phosphate P
0.4L Sulphate SO₄
0.9L Potassium K

Urine concentrates about 80% of all plant nutrients produced in the human body


¹ New Insights in Matters of Plant Nutrition, Soil Microbes and their Role in Recycling of Human Excreta and Regenerating Soil Fertility , Jürgen Reckin, 2010, Institute of Wastewater Management and Water Protection, Hamburg University of Technology.


The Nutrients Recovery Project has saved:

  • Human Water H₂O
  • 684 ℓ
  • Flush Water H₂O
  • 5278 ℓ
  • Nitrogen N
  • 5.6780 kg
  • Phosphorous P
  • 0.5678 kg
  • Sulphate SO₄
  • 0.5678 kg
  • Potassium K
  • 1.7662 kg
  • CO₂ Greenhouse Gas
  • 18.608 kg

Recovered 639 ℓ of urine since 1 June 2013
as of 24 November 2014.