harvesting pee from public urinals for green roofs

from   http://www.ubmfuturecities.com/author.asp?section_id=242&doc_id=526122
On Sunday, the city's water corporation, Waternet, installed a set of temporary urinals in La Place de la Bourse. Men are being encouraged to use these urinals so Waternet can collect their urine. It will then seek to extract the phosphates from the urine and turn them into struvite, which is a fertilizer used in agriculture and horticulture.

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