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It has been the standard practice of wastewater treatment plants to manage of site odors by measuring hydrogen.
sulfide (H2S) levels at the fenceline of the plant property. The assumption starts with the fact that H2S has a particularly offensive odor, even or especially at low levels. It is also a toxic compound, at higher levels, depending on one’s exposure to it. And H2S is a by-product of treating sewage wastewater. Therefore, if the H2S near a treatment facility is measured and kept under a certain level, odor is assumed to be managed.
A recent air sampling of a municipal wastewater treatment plant showed 66 separate compounds that have the potential to produce odor.
European studies on numerous WWTP shown values of r2 between the H2S and the odor concentrations to be as low as 7 to 69%.