In the separation process at treatment plants, solid material (sludge) settles to the bottom while liquid material flows off to the river system, and the solids are further treated to produce biosolids cake, which is an earthy material good for use as fertilizer.
factualpending
Speaker
Joe CummingsEvidence Quote
“We're separating out the solid material that will settle to the bottom, a sludge, and the liquid that goes off back into the river system. The solids have been treated further to produce what we call biosolids cake, which is an earthy material.”
Source
How Chicago Cleans 1.4 Billion Gallons Of Wastewater Every Day | Deep Cleaned | Insider— InsiderCreated: 8/10/2026, 10:46:36 PM
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