From watching too much TV ...
Imagine (God forbid) that one is lost in a desert (no water in sight) or on the
open-seas (water, water everywhere, but not a drop to drink!)...
Mammals (including us people) tend to die sooner from thirst, rather than hunger.
The ultimate recycling (survival) thing to do is to drink one's "own" p!
TV said that while "fresh", it should be 90+(something) pure water and
sterile (still clean). A few surviving days should be gained...
Another scenario... image, because of some major global mishap...
One can use his own p to fertilize(N), enough crop e.g., corn (one staple food)
to grow and feed a family of 4; again a survival thing...
On the other hand, I stopped buying any of those cheap so
called "top-soil" 40lb bags that are nothing else but
a somewhat mixed-up sewage-sludge
(and not knowing of what other biological/metals/toxins are left-over within).