Nitrogen Removal in an aerated Vertical Flow Treatment Wetland for Combined Sewer Overflow
2024
Portela, Daniella | Tondera, K. | Troesch, Stéphane | Molle, Pascal | Réduire, valoriser, réutiliser les ressources des eaux résiduaires (UR REVERSAAL) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés [équipe IAPHY] (LEHNA IAPHY) ; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS)
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Mostrar más [+] Menos [-]Inglés. Our study focused on the removal of pollutants from combined sewer overflow (CSO) using aerated vertical flow wetlands (VFW). Over a 7-months period, a pilot was fed with variable inlet concentrations and hydraulic loading rates of 0.5, 1.0, and 1.5 m3.m-2. Two aeration strategies were tested, intermittent aeration and continuous aeration, and their results were compared. Online measurement of NH4-N and NO3-N helps to balance nitrogen oxidation processes during a feeding event. The average removal rates of TSS, COD, dissolved COD (CODs), and NH4-N were always above 74%. Despite continuous aeration had showed higher oxygen concentration, the percentage of untreated NH4-N leaving the filter was similar in both aeration strategies. Additionally, higher NO3-N outflow loads during continuous aeration may be explained by temperature effect. Ongoing tests aim to reach a better comprehension on nitrogen conversion processes.
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