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Wastewater Treatment Facility
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  Virtual Tour

Headworks Facility
The headworks facility is where the wastewater enters the treatment plant. It´s purpose is to remove the inorganic material that cannot be "broken down" in the biological treatment process.
Aeration BasinsView Pictures!
Large turbine blowers deliver air to provide oxygen as well as mixing to the microorganisms in the wastewater. The aeration basins are aerated using fine-bubble diffusers mounted uniformly above the basin floors. The goal of this is to convert dissolved and suspended organic matter into a form more readily separated from the water being treated.
Secondary ClarifiersView Pictures!
Secondary clarifiers are used to separate suspended particles in the mixed liquor that are heavier than water, by gravitational settling (sedimentation). This process removes microorganisms and organic material from the water before it is discharged into the receiving stream.
Disinfection
Sodium Hypochloride (bleach) is metered into the effluent to disinfect it. Then after being disinfected, Sodium BiSulfate is metered in to remove the residual chlorine before the effluent flows into the river which is our receiving stream.

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Wastewater History   Wastewater Terminology
FAQs   Virtual Tour
Contact Us   Preventing Backups

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CITY CALENDAR
- City Council Meetings 1st & 3rd Tues. of month 7:00 p.m., City Hall
- Board of Fire & Police Comm. space Second Friday of each month 4:00 p.m., City Hall
- Historic Preservation space 2nd Thursday of each month at noon 12:00 p.m. City Hall
- Ottawa Tree Board space last Thursday of each month 7:00 p.m., City Hall
- Plan Commission space 4th Monday of each month 7:00 p.m., City Hall
- Playground and Recreation Board space 2nd and 4th Thursday of each month 7:00 p.m., City Hall
- Senior Citizen Comm. space1st Thursday of each month 10:00 a.m., City Hall
- Special Events Committee spaceTo be announced City Hall 2nd floor conference room
- Visitors Center Board space4th Monday of each month 4:00 p.m., At Visitors Center
- Zoning Board of Appeals 3rd Thursday of each month (as needed) 7:00 a.m., City Hall
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©2005 City of Ottawa, Illinois. All Rights Reserved.
 Ottawa City Hall · 301 West Madison Street · Ottawa, IL 61350 · Phone: 815-433-0161 · Fax: 815-433-2270