Reuse--the ultimate sink? Urine-diverting toilets to protect groundwater quality and fertilise urban agriculture.

People are concerned about water and food scarcity and the threats that faecal pollution and malnutrition pose to their health. Ecological sanitation systems open up for new, constructive options in sanitation, not least in poor periurban areas. The purpose of developing a no-mix excreta disposal system is to save water, to reduce wastewater treatment problems, and to protect groundwater quality as well as to recirculate nutrients from urine. In this paper all these aspects will be dealt with comprehensively.