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Operating Parameters for High Nitrite Accumulation during Nitrification in a Rotating Biological Nitrifying Contactor
Incomplete nitrification was studied in a completely and partially submerged rotating biological contactor (RBC). In a partially submerged RBC without additional aeration, 50 to 90% nitrite accumulation (α) was achieved at rotation speeds (ω) of 2 to 18 min−1. In a completely submerged RBC operating during 80 days, a higher α of 96% was achieved at ω = 2 min−1. Incomplete nitrification in a completely submerged RBC at oxygen concentrations of 1.5 to 6.8 mg O2/L indicated that the mass transfer of oxygen is rate‐limiting. Modeling of the completely submerged RBC predicts that the oxygen profile will not penetrate the biofilm more than 30 μm, thereby strongly limiting the nitrite‐oxidizer growth and causing high nitrite accumulation. Molecular analysis (i.e., fluorescence in situ hybridization) indicated that the nitrite‐oxidizers are superficially located (<200 μm) and that the ammonia‐oxidizers comprise up to approximately 800 μm of the biofilm.
Operating Parameters for High Nitrite Accumulation during Nitrification in a Rotating Biological Nitrifying Contactor
Incomplete nitrification was studied in a completely and partially submerged rotating biological contactor (RBC). In a partially submerged RBC without additional aeration, 50 to 90% nitrite accumulation (α) was achieved at rotation speeds (ω) of 2 to 18 min−1. In a completely submerged RBC operating during 80 days, a higher α of 96% was achieved at ω = 2 min−1. Incomplete nitrification in a completely submerged RBC at oxygen concentrations of 1.5 to 6.8 mg O2/L indicated that the mass transfer of oxygen is rate‐limiting. Modeling of the completely submerged RBC predicts that the oxygen profile will not penetrate the biofilm more than 30 μm, thereby strongly limiting the nitrite‐oxidizer growth and causing high nitrite accumulation. Molecular analysis (i.e., fluorescence in situ hybridization) indicated that the nitrite‐oxidizers are superficially located (<200 μm) and that the ammonia‐oxidizers comprise up to approximately 800 μm of the biofilm.
Operating Parameters for High Nitrite Accumulation during Nitrification in a Rotating Biological Nitrifying Contactor
Antileo, Christian (author) / Roeckel, Marlene (author) / Lindemann, Jörg (author) / Wiesmann, Udo (author)
Water Environment Research ; 79 ; 1006-1014
2007-09-01
9 pages
Article (Journal)
Electronic Resource
English
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