Abstract
The main proportion of the plant nutrients in waste from society can be recycled in two unpolluted fractions if the urine and the faeces are collected separately. By using urine-diverting toilets combined with a whirlpool surface tension faecal separator, it is possible to achieve this. If the separator is installed correctly, with a gradual bend to minimise disintegration of the particles, it is possible to collect approximately 92% nitrogen, 86% phosphorus and 76% potassium of the content excreted in the faeces in a small separated fraction that only contains 10% of the flushwater used. The faecal separation is a robust system with no moving parts, which is not significantly affected by the flushwater volume, and almost no water is separated to the separated solids if neither toilet paper nor faeces are flushed.
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