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Article Dans Une Revue Water Science and Technology Année : 2024

Effect of floating treatment wetland coverage ratio and operating parameters on nitrogen removal: toward design optimization

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Floating treatment wetlands (FTWs) have the potential to improve the quality of wastewater discharges, yet design basics are unavailable tosize these systems. This study investigates the effect of FTWs’ coverage ratio and hydraulic retention time on agri-food wastewater treatment.This was studied in a pilot-scale experiment comprising four lagoons (6.5 m3 each) fed with real effluent from an existing tertiarytreatment lagoon. An evaluation of FTW of different sizes (L24, L48, and L72 representing 24, 48, and 72% of pilot lagoons surface areas)and a control, L0 (without FTW), was performed over 16 months. Overall, L72 and L48 moderately improved total nitrogen (TN) mass removalcompared to L0 (p,0.05), while L24 exhibited similar TN mass removal (p ¼ 0.196). The highest improvement was observed for L72, exhibitingup to 55% (mean of 13%) greater N mass removal than the control. The net increase in TN removal by FTWs was mainly related todenitrification, promoted by decreasing dissolved oxygen for increasing FTW coverage ratio. Residence time, temperature, and dissolvedoxygen were the main parameters driving TN removal by FTWs. Retrofitting existing lagoons with FTW can facilitate N retrieval throughplant harvesting, thereby reducing N remobilization from sediment (common in conventional lagoons).
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hal-04591624 , version 1 (29-05-2024)

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R Abi Hanna, Karine E. Borne, Yves Andres, Claire Gerente. Effect of floating treatment wetland coverage ratio and operating parameters on nitrogen removal: toward design optimization. Water Science and Technology, 2024, 89 (6), pp.1466-1481. ⟨10.2166/wst.2024.064⟩. ⟨hal-04591624⟩
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