Upper Salada &
Lower Salada Pump Stations
Consulting Engineer: TetraTech
Moulton Niguel Water District
Complaints of hydrogen sulfide odors from their sewer system led the California coastal community of Moulton Niguel Water District (MNWD) to investigate such odor control remedies as scrubbers, chemical treatment and ECO2 SuperOxygenation technology. Because of physical constraints for gas phase scrubbers and the high cost of chemicals, neither was deemed practical or cost effective.
The ECO2 system offered several valuable advantages including a return on investment, increased service life of the force main (a result of preventing corrosion due to hydrogen sulfide formation) and the elimination of odors at the force main discharge. The City elected to install on-site oxygen generation to allow the entire ECO2 system to be built inside of the existing pump station.
The first ECO2 SuperOxygenation system was installed at the Upper Salada pump station during the Summer of 2008. It was meeting all design criteria and in 2010 the District acquired a second system for the Lower Salada pump station.
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 system operates by redirecting a side-stream flow of 700 gpm of raw, unscreened wastewater from the force main and pumping it through an ECO2 Cone. Oxygen is generated onsite by vacuum swing adsorption technology. Oxygen gas is delivered at a rate of up to 500 lbs per day into the ECO2 Cone which has an exceptionally large oxygen/wastewater interface generated by an intense bubble swarm to achieve rapid oxygen dissolution. The ECO2 SuperOxygenation system completely dissolves the gaseous oxygen into the wastewater side-stream before it is blended back into the force main. Enough oxygen is dissolved into the force main to oxidized existing H2S generated upstream of the force main and sustain aerobic conditions through the remainder of the force main, thereby preventing the formation of H2S and the associated corrosion.
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.