Date
Tuesday, September 10, 2024
Time
3:45 PM - 4:15 PM
Name
City of Firsts Upgrades Wastewater Treatment
Track
Engineering & Construction
Description

The City of Danville, KY is known as the “City of Firsts”. Danville was location of first courthouse in Kentucky, first U.S. Post Office west of the Alleghenies, first capital of Kentucky, first college in the West, first law school in the West, and first state-supported School for the Deaf. Danville is also called the “Birthplace of the Bluegrass” since the first Constitution was signed in 1792 at Constitution Square. Today, the City of Danville is a thriving community of 16,292 with a broad-based economy. The City is blessed with an abundant water supply, highly efficient roads and infrastructure, and a well-educated workforce. Danville is also home to Centre College, one of the most prestigious small liberal arts colleges in America. Danville’s wastewater treatment plant (WWTP) is rated for 6.5 million gallons per day (MGD), and features a flow equalization lagoon, two oxidation ditches, final clarifiers, and ultraviolet (UV) disinfection. The WWTP discharges to Clarks Run, a tributary of the Dix River. In 2021 the City of Danville began construction on a major project to upgrade the WWTP. Problems to be addressed included a failing UV disinfection system, inadequate screening of solids, limited sludge handling/processing facilities, and an outdated and undersized operations building and laboratory. The project was envisioned and developed as a two-phased project: Phase 1 to address these immediate needs and Phase 2 to expand the permitted capacity of the WWTP. The Phase 1 improvements are scheduled for completion by March 31, 2024. Major components of the project include the following: • Two-story Control/Operations building (approx. 7,300 SF) • Mechanical screen in outdoor enclosure • New Solids Dewatering building with two screw presses, sludge pumps, thickener pumps and polymer feed system • UV disinfection system • Electrical Buildings #1 and #2 • Updated electrical service and power feeds • Standby diesel generator • Aeration improvements to sludge holding tanks • Plant sewer pump station • New RAS and scum pumps This presentation will focus on evaluation and design of the WWTP, the major improvements included, and details of construction. Due mostly to equipment supply chain disruptions that began during the COVID pandemic, the overall construction duration extended to 32 months. We will discuss design and construction issues, how they impacted the project, and how they were addressed to ensure successful completion of the project.