Odor Control Using Pure Oxygen, Raymore, MO

Working in wastewater we’ve come to accept the fact that flowing wastewater goes septic over time and we’re left with managing the consequences of high hydrogen sulfide (H2S) and sulfide loads and the associated odors and corrosion. Widely accepted management practices are ventilating odorous spaces and scrubbing the air in chemical or biological scrubbers. Alternatively, a variety of chemicals are available for liquid phase sulfide control, creating a dependency on chemical suppliers and causing high O&M costs.Using pure oxygen for odor and corrosion prevention has gained significant momentum in recent years due to its low operating cost and advancements in technologies to efficiently dissolve oxygen into wastewater. Foul odors emanating from wastewater collection and treatment plants are largely caused by the presence of H2S, which is formed under anaerobic conditions. A logical solution to H2S control is therefore the addition of pure oxygen to induce aerobic conditions.The presentation will give background information on the root cause of odor and corrosion and how it can be prevented through the targeted addition of dissolved oxygen. A case study of an installation in Raymore, MO will be presented.The City of Raymore, MO has an extensive sewer system including 17,000 feet of force main that discharges in the main downtown business district, causing significant odor and corrosion issues for the City. H2S concentrations in the downstream gravity interceptor were measured as high as 1,000ppm, causing not only health but also safety risks.HDR was hired to do a comparison of chemicals and Superoxygenation Systems to combat the problem. As the SuperOxygenation System prevents H2S formation, rather than treating the extremely high concentrations, the results were significantly better than existing chemical use and they provide a more consistent and lower life cycle cost for budgeting.Results of the odor control project and pictures of the installation will be presented.