In the United States, the water part of raw sewage is extracted, purified, and placed back into a waterway or on crops.
The solids are sterilized and composted.
Often they are then sold to fertilizer companies to package and sell back to the original owners.
Proper collection and safe disposal of human waste is considered a necessity in most urbanized, industrialized societies.
The words sewage comes from the Old French word seuwiere which means “to drain the overflow from a fish pond” or “to drain”.