Collection and Concentration of Urine to Produce a Mineral Fertilizer

This study focuses on the development of a method which makes it possible to remove a maximum amount of water from urine whilst keeping nutrient losses as low as possible. With this goal in mind, three different urine drying systems, so-called as batch, circulation and continuous systems, were designed and assessed in Can Tho University. Their operations are based upon the principle of solar distillation. The objective of the research is to find their efficiency of producing a final product with a high nutrient content, which can easily be transported, and which is accepted by farmers and consumers. The results show that the batch system is a “low-tech” treatment unit made of concrete and characterised by a high treatment efficiency.