Made me curious so I went looking for information. Incredibly frustrating that almost every high-level source focuses on how the water is cleaned and solids are

Made me curious so I went looking for information. Incredibly frustrating that almost every high-level source focuses on how the water is cleaned and solids are removed. Removed where? Doesn’t say. Eventually I found one local source that says it’s incinerated. So the human biological cycle doesn’t return the solids to the earth but puts it into the atmosphere? That’s pretty crappy.