Both the sewage treatment plants in Utah Valley, where I live, make incredible compost out of the sterilized sludge, mixed with chopped up green waste. They will load the back of your pickup for $20 to $25. Do they do that in other places?
We have used it for our square foot gardening boxes, along with peat moss and vermiculite. We use it to dress all the flower beds. One raised bed is filled completely with it. Our friend got us a dump truck load. Everything growing in that bed is three times the size of everything else.
You may want to rethink that idea. I've heard some medicines don't compost completely and people flush leftovers which go into the sewage.
Personally, I would only use that kind of fertilizer for ornamentals. I’ve heard of people using milorganite type fertilizers, though. When it comes to using “manures”, I only use plant eaters and fish by products types on my edibles.