| Summary: | Municipal facilities can generate odors caused by substances such as fatty acids, organosulfur compounds, aldehydes, and inorganic gases, especially H<sub>2</sub>S. Identifying an effective and cost-efficient solution to the problem is a priority for communities in areas at risk of exposure to odors. The aim of this study was to evaluate the effect of advanced oxidation processes (AOPs) involving Fenton’s reagents (Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>, Fe<sup>3+</sup>/H<sub>2</sub>O<sub>2</sub>) on wastewater profiles and their capacity to reduce putrescibility, H<sub>2</sub>S emissions, and odor concentration in the air. The Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> system proved to be the most efficient in terms of inhibiting the process of redox conditions development, removing organic matter in the wastewater, inhibiting H<sub>2</sub>S formation, and reducing odor emissions. H<sub>2</sub>S generation in raw wastewater was triggered as early as on day 2 of anaerobic retention, with levels of 5.6 ppm to 64 ppm. After introduction of 0.1 g Fe<sup>2+</sup>/dm<sup>3</sup> and 2.0 g H<sub>2</sub>O<sub>2</sub>/dm<sup>3</sup>, no H<sub>2</sub>S was detected in the gas for 8 days. The odor concentration (OC) of raw wastewater (2980 ± 110 ou<sub>e</sub>/m<sup>3</sup>) was reduced by 96.3 ± 1.9% to a level of 100 ± 15 ou<sub>e</sub>/m<sup>3</sup>. The Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> system maintained its oxidizing capacity up until day 7, with OC reduction by 96.0 ± 0.8% to a level of 120 ± 10 ou<sub>e</sub>/m<sup>3</sup>. On day 10, the OC showed a marked increase to a level 1310 ± 140 ou<sub>e</sub>/m<sup>3</sup>. The conducted research has proven that Fenton-based AOP systems are a technologically and commercially viable method of deodorization of sewage facilities.
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