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The present study examines the development of a push-pull ventilation system with localized extraction located for use in wastewater treatment. The proposed approach aims to minimize the concentration of H 2 S in the settling stage of a wastewater treatment plant located in Santiago de Chile. Computational fluid dynamic simulations were implemented, and these were contrasted with actual measurements of H 2 S emission to assess and to improve the existing forced crossed ventilation system in place. Along with the measurement of H 2 S emissions, other important operating parameters of the existing ventilation system, including air velocity and NH 3  concentration were measured. The measurements at different positions of the settling stage of the wastewater treatment process showed H 2 S concentrations as high as 21 mg/m 3  at the center over the water surface when utilizing the existing crossed ventilation system. In general, the measured H 2 S concentrations agree with those predicted by computational simulations, with discrepancies between 8.1% and 28.4%. An assessment of the improved ventilation system with localized extraction systems (push-pull) was carried out to determine the level of effectiveness of decreasing the concentration of H 2 S in the settling plant. According to the obtained results, the concentration of H 2 S in the corridors of the plant does not surpass 7.5 ppm, which meets the required Chilean regulation.

An improved ventilation system for settling stage of a wastewater treatment plant: a computational simulation analysis