Trinity River Authority of Texas
Central Regional Wastewater System
Total Treated Flow of 150 MGD
James McMillen, P.E.
Alan Plummer Associates, Inc.
The Trinity River Authority’s Central Regional Wastewater System, located in Dallas, Texas, serves over 1 million people in 20 north Texas cities. Since the early 1970’s, the Authority has included odor control as one of the top priorities in its master plan, and in 2003, the TRA completed a comprehensive odor abatement evaluation. After evaluation of structural and chemical odor control options, TRA selected the ECO2 SuperOxygenation System as part of their Stage VII Odor Control Improvement Program.
One of the goals of the odor abatement program is to reduce odorous emissions in the primary clarifiers. Structural options including primary clarifier covers and gas scrubbers were very expensive to construct, maintenance-intensive and potentially hazardous to employees. A pilot study using dissolved oxygen showed that the highly odorous and hazardous hydrogen sulfide could be effectively removed prior to wastewater reaching the treatment plant headworks. Two ECO2 SuperOxygenation cones will dissolve pure oxygen into wastewater sidestreams to provide a minimum of 11 mg/l D.O. at the headworks.
The ECO2 SuperOxygenation system, designed in conjunction with consulting engineers, Alan Plummer Associates is presently under construction at TRA’s Central Regional Wastewater System treatment plant.
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.
Trinity River Authority of Texas
The Trinity River Authority encompasses all of five and parts of twelve counties within the Trinity River Basin, providing water and wastewater treatment, water supply and reservoir systems to a population of over 3.5 million, including the Dallas and Fort Worth areas.
TRA’s main treatment facility is the Central Regional Wastewater System, which includes a 200 mile collection system. The CRWS is an award-winning treatment facility, known for its innovative programs and operations excellence.
SuperOxygenation is an economically competitive and environmentally friendly odor control process that prevents the formation of sulfides in force main systems.
Trinity River Authority desires the following results:
- Dissolve 90% of supplied oxygen into wastewater
- Provide a minimum DO of 60 mg/l at discharge point of SuperOxygenation system
- Provide a final minimum DO of 11 mg/l in the stream at the entrance to the treatment plant
Force Main (2 each)
|Pressure at System Connection||19||psig|
|Retention Time at Avg. Flow||5||min.|
ECO2 System Design (2 each)
|Oxygen Dissolution Rate||6900||lb./day|
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.