As for spreading human manure on fields...it can be done.
The City of South Portland wanted to spread human manure on our farm fields as I have a few acres, and we looked into it, but did not feel right about it. Typically, if someone is giving you something for free, there is a reason for it. And...I have not seen much good come out of South Portland!
I am glad we chose
not too spread the stuff on our farm.
Some neighbors did, and now you cannot use land that has been treated with human manure for a house lot 100 years from the last year of human manure being spread. I do not intend to ever sell my land, but still, that says something about the stuff.
What we did want though, was wood ash for our highly acidic soil, and the mills and bio mass locations used to give us that for free. Then they decided, if farmers wanted the wood ash, but not the humane manure, they would mix it together so that farmers HAD to take the human manure if they wanted the free alternative to lime. We still did not take it, but other farmers did. Now I see those mixing places are no longer in operation, so I am not sure if they changed the laws again or not.
I do kind of feel bad. The waste water treatment plants are a true answer to societies problem, and treating 99% of the waste is good, but I still do not want that other 1% on my land. The farmers that took it, had fields littered with condoms, and other kinds of junk that came along with the "sludge" as it was called. I heard it had drugs (prescription and illegal drugs) in the sludge as well, but I am not sure.