Crest Hill West Sewage Treatment Plant

Connelly Electric partnered with Vissering Construction on a Crest Hill treatment plan project which increased the capacity of the West Sewage Treatment Plant from a current design average flow (DAF), design maximum flow (DMF), and peak hourly flow (PHF) of 1.3 million gallons per day (mgd), 3.0 mgd, and 9.0 mgd, respectively, to a DAF, DMF, and PHF of 2.2 mgd, 5.5 mgd, and 13.8 mgd, respectively. The expansion included a new Headworks Complex with mechanically cleaned fine screening, influent flow metering, influent pumping, and primary clarification; new aeration tanks; two new final clarifiers; replacement of existing sand filters with new cloth disc filters in the existing Filter Building; new ultraviolet disinfection and post aeration; and new plant outfall. Improvements also include one new Excess Flow Clarifier, liquid chlorine excess flow disinfection, and sodium bisulfite dichlorination; a new Blower Building housing blowers, chemical phosphorus removal facilities, and return activated sludge pumping; a new Administration Building; conversion of the existing aeration tanks to aerobic digesters; demolition of the existing Administration Building and Anaerobic Digestion Complex; and miscellaneous piping, mechanical, heating, and air conditioning, electrical, supervisory control and data acquisition, and site improvements.  

Electrical systems included the installation of a new plantwide electrical power distribution system, low voltage control system, SCADA system, street & site lighting, interior lighting, grounding, CCTV, fire alarm, and access control in hazardous and corrosive environments.   

Benefits Delivered:

• Safe and high-quality installation
• Multi-trade site coordination
• Cost savings
• High quality and performance