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Nitrification of a high-strength wastewater in an inverse turbulent bed reactor : effect of temperature on nitrite accumulation

Abstract : An inverse turbulent bed reactor was investigated for nitrification of a high-strength synthetic wastewater (250–2000 mgN–NH4+ l-1). In this reactor, a granular floating solid is expanded by an up-flow current of air. The start-up period was studied during 120 days, including biofilm formation, at a temperature of 30 °C. At the end of this start-up period, the reactor completed stable nitrification to nitrate at a nitrogen loading rate (NLR) of 3.6 gN lreactor-1 d-1. Then, the reactor was run at 30 °C during 114 days without any nitrite accumulation. When the temperature was increased to 35 °C, an immediate and durable nitrite accumulation occurred in the system during 116 days. Even after decreasing the temperature to 30 °C, complete ammonium conversion to nitrate was only possible by decreasing drastically the NLR. N2O production was evaluated in the process to be 2.2 and 3.2% of the influent ammonium nitrogen at 35 and 30 °C, respectively.
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https://hal.inrae.fr/hal-02666381
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Submitted on : Sunday, May 31, 2020 - 8:38:34 AM
Last modification on : Thursday, December 17, 2020 - 2:54:31 PM

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Daisy Bougard, Nicolas Bernet, Dominique Chèneby, Jean Philippe Delgenes. Nitrification of a high-strength wastewater in an inverse turbulent bed reactor : effect of temperature on nitrite accumulation. Process Biochemistry, Elsevier, 2006, 41 (1), pp.106-113. ⟨10.1016/j.procbio.2005.03.064⟩. ⟨hal-02666381⟩

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