Rotating slats in aerated grit tanks skim off scum floating on the surface and scrape up sludge from the bottom of the tanks, with the sludge then sent to digesters and centrifuges to become nutrient-rich biosolids fertilizer.
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Narrator, Joe CummingsEvidence Quote
“Next, a series of rotating slats skims off the scum floating on the surface and scrapes up the sludge from the bottom of the tanks. That sludge goes on to our digesters, to our centrifuges. Ultimately become our nutrient-rich fertilizer that we call biosolids.”
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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