Knoxville Utilities Board
Forks on the river Pump Station
<5 ppm H2S in gas phase
Jeff Hooyman, Engineer.
Knoxville Utilities Board
In 2004, the Knoxville Utilities Board (KUB) initiated the innovative PACE 10 (Partners Acting for a Cleaner Environment) program to accelerate wastewater system improvements. PACE 10 is a fast paced 10-year program to eliminate sewer overflows, meet Clean Water Act requirements and comply with federal regulations. To date, the KUB has improved over 23 miles of pipelines and completed major work on storage tanks and the collection system.
The KUB received numerous odor complaints each year from the area surrounding their Water Treatment Plant and a local day care facility. The Hydrogen Sulfide smells originated at the Forks in the River Pump Station and the corrosive gasses were negatively impacting the integrity of force main piping and equipment. In keeping with the PACE 10 program objectives, the KUB decided to combine the problem of stopping odor complaints with improving the longevity of existing and new collection system infrastructure.
The Board considered all available alternatives for controlling the H2S odor, including chemical addition, scrubber installation and use of Bioxide. The KUB has a long history of making environmental responsibility a priority, so they also reviewed the environmentally-friendly ECO2 SuperOxygenation System. They ultimately selected the ECO2 SuperOxygenation System as a cost-effective, non-chemical solution to prevent the formation of Hydrogen Sulfide and solve their odor and corrosion problem at the same time.
With a goal of reducing Hydrogen Sulfide to an average of <5 ppm, ECO2 custom-designed and installed their proprietary Speece Cones with oxygen injection, metering and monitoring systems. The project began in 2007, with completion in early 2008. H2S levels that previously spiked up over 1,000 ppm have been reduced to an average of <1 ppm with the installation of the ECO2 SuperOxygenation System.
Innovative and highly effective, SuperOxygenation technology is an eco friendly alternative to traditional chemical treatments for water and wastewater. Focusing on odor and corrosion prevention, ECO2 has helped cities across the country solve their needs in both municipal and industrial applications.
The Knoxville Utilities Board provides energy and water utilities to over 67,000 customers with four wastewater treatment plants and 61 pump stations in the 248 square mile area served. Odors emanating from the Forks in the River Pump Station and force main resulted in continuous complaints in the surrounding area, The KUB decided to prevent H2S from forming, thus preventing odors and corrosion by installing an ECO2 SuperOxygenation System.
The Forks in the River Pump Station pumps a combination of industrial and residential wastewater approximately 6.4 miles to the treatment facility. Monitoring indicated that industrial discharges to the system were extremely high, with BOD spikes of over 600 mg/I.
During Phase 1 of the project, an ECO2 System was installed at the midpoint of the force main and was successful in reducing H2S to an average of 6 ppm. Phase 2 included installation of a second ECO2 System at the beginning of the Forks in the River force main. After installation and start up of the ECO2 System, H25 was successfully reduced to <1 ppm. (See OdaLogs below.)
The ECO2 SuperOxygenation Systems have resulted in elimination of odor complaints and the protection of the Knoxville Utilities Board’s investment in the Forks in the River section of its collection system.
H2S concentrations in ppm, before and after ECO2 system installation.
ECO2 System Design Cone at Pump Station
ECO2 System Design Cone at FM Midpoint
Become a leader in water treatment.
ECO2 SuperOxygenation systems for water and wastewater treatment are designed and produced by Eco-Oxygen Technologies, LLC headquartered in Indianapolis, Indiana. The technology is the pioneering effort of Dr. Richard Speece, Centennial Professor Emeritus of Civil and Environmental Engineering at Vanderbilt University.
The ECO2 oxygenation method is a simple process based upon the scientific principle of Henry’s Law. No chemicals and no moving parts other than standard industrial water pumps are used. The result is a robust, reliable, economically competitive and environmentally friendly technology.
In municipal applications, ECO2 technology eliminates hydrogen sulfide odor and corrosion by dissolving pure oxygen in wastewater at high concentrations (50-75 mg/l) which prevents the formation of hydrogen sulfide and the associated “rotten-egg” odor. This approach saves money on alternative chemicals, provides pretreatment and does not increase total dissolved solids. ECO2 engineers are presently focused on wastewater projects in Maine, Indiana, California, Kentucky and Texas.