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Konferensartikel2004

Separation of faeces combined with urine diversion - function and efficiency

Vinnerås Björn, Jönsson Håkan

Sammanfattning

The main proportion of the plant nutrients in household wastewater is found in the toilet fraction, and originates from urine and faeces. Using a blackwater system, is is possible to collect these nutrient rich fractions. However, the nutrients in the blackwater are diluted by large amounts of flushwater, even if a low-flush vacuum system is used. By using a combination or urine diversion and separation of faecal matter from the flushwater, it is possible to collect the majority of the nutrients in a much more concentrated form compared to blackwater systems. The efficiency of instant separation is higher than separation in a filter bag. The efficiency of the separation depends on the system design but if correctly designed and built, it is possible to separate 84% N, 86% P and 65% K from the faecal matter. In a system where 95% of the urine is diverted and the faecal matter is instantly separated, 93% of the nitrogen, 92% of the phosphorous and 87% of the potassium are separated into a fraction comprising half the volume of blackwater from a vacuum system

Nyckelord

Blackwater; faecal separation; nutrient recovery; nutrient recycling; urine diversion

Publicerad i

Titel: Ecosan - closing the loop : proceedings of the 2nd international symposium, 7th - 11th april 2003, Lübeck, Germany
ISBN: 3-00-012791-7
Utgivare: The 2nd International Symposium on Ecological Sanitation

Konferens

The 2nd International Symposium on Ecological Sanitation, Incorporating the 1st IWA Specialist Group Conference on Sustainable Sanitation