Nearly 100%. Sludge before thickening is usually 0.5% solids, and the solid chunks that are eventually hauled off to the dump are above 10% solids.
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I have a figure that claims 20,000 gallons per year per person in the US although I can't cite the source. I believe it was in one of these two books: The Urban Environmental Reader or Urban Environmental Planning.
20,000g/365days = 54.8 g
Sewage treatment plants are built to meet service requirements so they can be sized for almost any daily flow from a one family home to a large city.