One wonders just what usage of “fine” is being applied here in “fine fertilizers?”
One of the problems with poop as fertilizer is the presence of heavy metals. This is a serious issue in industrial cities Wash DC because it has no heavy industry has poop very low in heavy metals and so makes good fertilizer
There was a project called Dano about 25 years ago set up in DC to convert sewage to fertilizer. It was abandoned after local contractors sabotaged it as a threat to their business