O’Fallon, IL wastewater treatment plant Improvements – Phase 1
O’Fallon IL
Project Cost
$4.8M
Completion
2013
Client
City of O’Fallon, ILlinois
About
The project expanded the wastewater treatment plant to 8.5 MGD DAF and 22 MGD PHF, including new headworks, UV disinfection, oxidation ditch, clarifiers, digesters, and process control upgrades in Phase 1.
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Facility planning was completed to expand the 5.61 MGD activated sludge wastewater treatment plant to 8.5 MGD DAF and 22 MGD peak hourly flow. Planned improvements included a new headworks, UV disinfection, a second Orbal™ oxidation ditch, additional secondary clarifiers, expanded aerobic sludge digesters, sludge handling upgrades, and provisions for nutrient and zinc removal.
Phase 1 of the project focused on constructing a new headworks building housing two mechanical fine screens and UV disinfection. Additional improvements in this phase included a new metering vault, upgrades to the non-potable water system, and new process analyzers in the Orbal™ oxidation ditch to optimize biological nutrient removal.