We wood be in trouble

I think @Rmay635703 also hit on the subject, at least partially, of pharmaceuticals that pass through the human system and get execrated as waste. Another perplexing issue no matter how human wastes are processed in mass amounts and released into the environment.

 

Great point.
Your comments reminded me of how many municipalities are testing their sewage to see how widespread viral infections like covid, measles and polio are in their population.

Hundreds Of U.S. Cities Testing Sewage For Early Signs Of Coronavirus Hotspots (forbes.com)

 

It may be too far out to try an think about how humans wastes are handled in space, and obviously the economic issues of converting our current systems to a more environmentally friendly process. Just like any other politically pressing issue, whatever it may be, it typically doesn't get eyeballs on the subject, until people start becoming aware of the depth or height. And this one, by it's nature, is near completely or of sight.