Scientists Use Recycled Sewage Water to Grow 500-Acre Forest in the Desert
A lot of people eat food grown with recycled sewage and don't even know it.Every excretion flushed in the city of Chicago ends up as fertilizer on midwest farms.  Mostly soybeans, IIRC.A lot of zoos sell their surplus animal dung in big bags called "zoo poo."  It's used in home gardens and small scale community farms.