Odor and Corrosion Control in Wastewater Collection Systems Utilizing Sustainable Treatment Gases: Oxygen and Ozone. Danton Brown, Co-Author. Oxygen into collection systems as a means of odor and corrosion control. Ozone has long been used in water treatment, dating back to at least the late 19. Design manual-Odor and Corrosion Control Sanitary Sewerage Systems and Treatment Plants. US Environmental Protection Agency. EPA/ 625/1-85/018, Cincinnati, Ohio, USA, October 1985, Chapter 3.
Hydrogen sulfide forms in wastewater collection systems when anoxic conditions exist and results in corrosion, odor and toxicity problems. The rate of formation depends primarily on the strength of the wastewater as characterized by BOD concentration (Biochemical Oxygen Demand) and rate constants for the reactions which are dependent on temperature. Hydrogen sulfide in most commonly a problem in systems with long detention times in warm weather. The hydrogen sulfide calculations assume that sulfate concentration is not limiting.The calculations are based on the Pomeroy-Parkhurst equation for predicting H2S concentrations in a sewer network; they can be used to evaluate the build-up or decay of the H2S concentration in a sewer system.
The sewer system can be gravity and pressure combined system consisting of conduits, ponds, channels, wet-wells, pumps, pressure pipes and junctions.The application procedures of Pomeroy equation for sewer system were well documented in the following publications:. ASCE Manuals and Reports on Engineering Practice No. 69, Sulfide in Wastewater Collection and Treatment Systems. EPA Design Manual EPA/625/I-85, Odor and Corrosion Control in Sanitary Sewerage System and Treatment PlantsThe usual equation to predict sulfide formation is the Pomeroy-Parkhurst equation given in English units as:The first term in the equation covers creation of sulfide while the second refers to loss.
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