Composting plants and organic waste treatment plants are significant sources of hydrogen sulfide (H₂S) and ammonia (NH₃) emissions—generated during the decomposition of biomass under anaerobic and aerobic conditions. Although concentrations of these gases are often below toxic thresholds, very low levels (often in the ppb/ppm range) cause odor nuisance and negatively impact residents' quality of life and relationships with the local community. Given current environmental standards, such as the Environmental Protection Law, implementing technologies that effectively reduce odor emissions is becoming essential. This study presents a comparative analysis of two deodorization technologies: - Compost bed biofiltration—a process in which gaseous odorants are first adsorbed onto a moist, porous medium and then biologically degraded by microorganisms present in the biofilm. - Hydrogen peroxide (H₂O₂) chemical scrubber – a mechanism based on the instantaneous oxidation of H₂S and NH₃ in an aqueous solution with the addition of H₂O₂ (and optional catalysts) during a short gas-liquid contact time. The study analyzed: H₂S and NH₃ input concentration levels consistent with typical composting plant values (~4mg/m³ H₂S, ~50mg/m³ NH₃), odor elimination efficiency in both systems, process parameters: retention time (EBRT), moisture, pH, medium structure, operational aspects such as H₂O₂ dosing, and practical criteria: operational stability and resistance to concentration spikes. The main research question concerned information on which technology – biofiltration or H₂O₂ scrubber – offers better efficiency and cost-effectiveness in conditions typical of composting plants.