Diverting human urine from outhouses into agriculture in Nicaragua : for sanitation, fertilizer and recycling purposes
Abstract: Human urine is a valuable resource which has good potential to be used as a fertilizer all over the world. In the developing countries sanitation and food security are both issues that need urgent attention. A urine separation toilet can be constructed with minimal investment in the Nicaraguan context, and the usage of the urine as a fertilizer can help establish higher yields and is a good alternative to chemical fertilizers. This field experiment is trying this in practice in the context of rural Nicaragua, to determine the effect of urine on two plants on. For this study, the common bean (Phaseolus vulgaris) and the Chaya (Cnidoscolus aconitifolius) was selected and the results confirm that urine has potential as a fertilizer in the Nicaragua context. The common bean yield was twice as large after urine fertilization and the Chaya reacted positively to urine fertilization. For urine separation purposes, two different separators were constructed on the site to showcase the benefits with separating the urine from the faeces, creating lower latrine volume and better sanitation in the outhouse. The risks associated with human urine are low if the urine is separated securely to avoid crosscontamination from faeces. If a safety-barrier system is adopted, the overall risks with using urine as a fertilizer are negligible. The spreading potential of urine separation and fertilization in rural Nicaragua is high, but more experiments and demonstrations are needed to reach adopters of the technology.
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