Take a look at this article on Osman Zafar, applicant at the VIA Water fund. His idea revolves around a way to  seperate urine from other household waste, combined with magnesium and processed into Struvite, a powder that can be used as fertilizer. Recently, he got to demonstrate his innovation for the Dutch Minister of International Cooperation and Trade, Ms. Ploumen.

You can find the article at the website of Aqua for All.