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\bibitem{Xie_etal2023} {\textquotedblleft}\textit{Feasibility of packed-bed trickling filters for partial nitritation/anammox : effects of carrier material, bottom ventilation openings, hydraulic loading rate and free ammonia}{\textquotedblright}. Xie Y, Jia M, De Wilde F, Daeninck K, De Clippeleir H, Verstraete W, Vlaeminck SE, Bioresource technology \textbf{373}, 128713 (2023).   http://doi.org/10.1016/J.BIORTECH.2023.128713

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