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Why Inverted Siphons are Typically an Odor Source and How to Eliminate This Source through SuperOxygenation

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In 2006, the City of Laguna sought new methods for preventative, non-chemical, in pipe treatment and found unprecedented success in odor reduction by installing ECO2® SuperOxygenation technology. The SuperOxygenation system is installed at the force main lift station where it dissolves enough pure oxygen to sustain aerobic conditions in the force main through its discharge to eliminate the formation of hydrogen sulfide. The system has successfully reduced untreated hydrogen sulfide gas in excess of 800 – 1000 ppm to an average of less than 2 ppm at the force main discharge. This is being done at a capital and annual operating cost resulting in a 3-year payback versus alternative chemical treatment. The results were so dramatic on the Bluebird force main that the City commissioned a second system to be installed at the Laguna SOCWA lift station that feeds the Bluebird lift station wet well. Both of these force mains have inverted siphons as well as numerous air release valves and reverse slopes to contend with. The oxygen stays in solution and prevents odors and corrosion throughout the length of the force mains.
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Keywords: Aerobic; Collection System; Corrosion Control; Liquid Phase Treatment; Odor Control; Pure Oxygen; Siphon; Speece Cone; SuperOxygenation

Document Type: Research Article

Publication date: 2010-01-01

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