Why that extra processing step? Soil bacteria do the urea→ammonia step just fine. Not to mention that urea is a very safe & stable compound.
Another issue is the possibility of spreading pathogens. A gardener can deal with this by just letting the urine sit for a # of months. But perhaps that's not a good approach for an industrial process?
Btw. "pee" in the url - nice touch. :)
> An estimated 1,000 litres of urine will be collected from nine women's urinals placed at the start.
Why only nine stations and only the woman's? Is man's not good enough, or, not so much because man always relieve themselves somewhere else than placed urinals?