When it was time to replace steel-dome gas collecting covers, the Town Branch Wastewater Treatment Plant went with a more economical option
The Town Branch Wastewater Treatment Plant located in Lexington, Kentucky, serves a population of 130,000 — about 60 percent of Lexington-Fayette County. The plant began operating in 1919, and currently treats almost 11 billion gallons of wastewater annually.
The customer’s needs:
The Town Branch Wastewater Treatment Plant needed to replace failing steel-dome gas collecting covers. This meant converting four existing tanks, which included a blending tank, two secondary digesters and a side-stream holding tank.
With the changes taking place, the plant knew it needed an odor-control solution and something to help maintain a more consistent temperature throughout the year without having to add heat. J Dwight Thompson Company, GTI’s area representative specializing in municipal and industrial water and wastewater process equipment, suggested the plant consider re-covering the tanks to minimize odors, but with a more economical product.
Geomembrane Technologies Inc. (GTI) was selected to fabricate and install custom-fit, insulated modular covers (each sized between 44- and 46-feet in diameter) for the four tanks at the Town Branch Wastewater Treatment Plant.
GTI’s durable modular cover design lets individual panels, also known as modules, be removed and replaced for routine maintenance. Each panel has additional support along the edges, meaning the covers are safe to walk on in any location — even when panels are removed.
The covers were tailored to fit around central floating mixers in each tank, so there is no upwelling. They float freely in the tanks, rising up and down as water levels change. The covers were installed without interfering with plant operation or needing to drain existing water within the tanks.
The covers GTI custom-fabricated for the Town Branch Wastewater Treatment Plant are functioning very well, and plant operators and management are pleased with the results. Odors are effectively controlled at the facility, thus maintaining community relations and worker satisfaction.