City of Ottawa, Illinois

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
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.

AerationBasins

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.

Secondary

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.

Gary Scott
Public Works Director
301 West Madison Street
Ottawa, Illinois 61350
815-433-0245 ext. 312 Phone
815-433-1934 Fax
E-Mail

Daniel F. Aussem
Commissioner of Public Property
301 West Madison Street
Ottawa, Illinois 61350
815-433-0161 Phone
815-433-2270 Fax
E-Mail