[sillypuddy]

Are you talking about milorganite?

[interestica]

That's brilliant. I'd forgotten about it.

https://www.milorganite.com/what-is-milorganite

So they use the sewage from the existing treatment system, let microbes process it all, and then extract/dry those microbes.

I was more thinking about needing means to rethink our toilet/sewage system entirely with a focus on initial separation.