The Main Treatment Facility Process Overview

Take the Virtual Process Tour for more details!

The main treatment plant is an activated sludge facility designed to handle all dry weather flow up to 5 million gallons per day (MGD), with a peak daily flow of 8 MGD and a peak pumping capacity of 15 MGD.

The plant process includes phosphorus removal, screening, grit removal, primary treatment, secondary treatment, anaerobic digestion of solids, and disinfection.

Sludge is treated by anaerobic digestion followed by belt filter press dewatering. 

Screen Building

The screen building removes large debris from the waste-water as it enters the facility.

Grit Chambers

Heavy materials, like sand, settle out in the grit chambers.

Pump Building

Since the treatment plant is primarily a gravity fed operation,

The wastewater needs to be pumped up to the primary tanks.

Primary Settling Clarifier

Primary settling removes suspended solids.

Blower Chemical Building

The BCB houses the aeration equipment for the aeration tanks.

Aeration Tanks

The aeration tanks provide a well-oxygenated environment

for microorganisms.

Final Clarifiers

These clarifiers allow for the final settling and removal of solids prior to disinfection and discharge of the wastewater effluent.

Digester Building and Belt Filter Press Building

The solids from the final clarifier, that are not recycled back into the system, are sent to the digester for further microbial processing. After the digesters the remaining sludge is sent to the belt filter press for dewatering and disposal.

The Combined Sewer Overflow Treatment Plant for District 2 (CSO No.2)

CSO No. 2 is used to handle high rates of flow that exceed the main plant’s design capacity, such as in the spring when snow melting occurs or during major rain events. This facility has a 50 million gallon aerated storage basin and is designed to contain a ten-year storm.  CSO No. 2 can treat 25 MGD of combined wastewater with a peak pumping capacity of 60 MGD. 

CSO No. 2 Screen Building and Contact Tank

CSO No. 2 Lagoon