In Sweden, the amount of nitrogen in the toilet waste corresponds to 20 percent of the sold nitrogen mineral fertilisers. The conventional production of nitrogen mineral fertilisers uses two percent of the world’s energy usage, and the production is heavily dependent on fossil fuels. The nitrogen removal processes at wastewater treatment plants are also very energy-demanding. Increased protein consumption in Sweden has led to increased nitrogen content in the wastewater.
SuNha stands for Sustainable Urban Nitrogen Handling.