The Northside Wastewater Treatment Plant Expansion project doubled the previous wastewater treatment capacity, replaced chlorination with ultraviolet disinfection, and was completed for $6 million under the original budget. The team of McKim & Creed/Hazen and Sawyer designed the improvements needed to expand the Northside Wastewater Treatment Plant from 8 to 16 MGD.
Process modifications included new headworks with the capability to remove grit smaller than 125 microns, new primary clarifiers, new aeration to allow for complete nitrification, new final clarifiers and RAS/WAS pumping, new blowers and blower building, new deep bed filters, new UV disinfection system, new effluent pumping station, additional anaerobic digesters, and an option design consideration for a new thermal dryer to produce Class A sludge. The project also involved recovering existing sewer easements, power line easements, and an abandoned railroad right-of-way to construct a new 30-inch force main. The new force main was approximately three miles long and started in an urban area; and crossed wetlands, heavy vegetation, and two large streams along a residential corridor to the downtown Wilmington district where it ended. McKim & Creed provided new easements, CAMA crossings, and topographic survey data.
For this second phase of a two-part improvements project for the Northside Wastewater Treatment Plant to expand it from 8 to 16 mgd, McKim & Creed performed PLC panel design and fabrication services for 11 control panels, PLC and HMI programming and radio. We also provided checkout/startup, and as-built documentation and training as related to the extended aeration, sludge digestion, chemical feed, disinfection, and reclaim high-service processes.