Nitrifying activity monitoring and kinetic parameters determination in a biofilm airlift reactor by respirometry |
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Authors: | Lorena Carvallo Julián Carrera Rolando Chamy |
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Affiliation: | (1) Department of Biochemical Engineering, Universidad Católica de Valparaíso, General Cruz 34, Valparaíso, Chile;(2) Department of Chemical Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain |
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Abstract: | The applicability of batch respirometry, as a simple technique for monitoring off-line nitrifying activity and kinetic parameters, was evaluated using two sets of ammonia and nitrite concentrations. The O2 uptake rate (OUR) profiles obtained from the assays were adjusted to a substrate inhibition model. The maximum specific ammonia-oxidizing biomass activity (rSmax) was 0.079 g N-NH4
+ g VSS–1 d–1 with a half saturation coefficient (KS) of 11 mg N-NH4
+ l–1 and an inhibition coefficient (Ki) of 3300 mg N-NH4
+ l–1. Besides, the maximum specific value of nitrite-oxidizing activity was 0.082 g N-NO2
– g VSS–1 d–1 with a KS of 4.1 mg N-NO2
– l–1 and Ki of 1400 mg N-NO2
– l–1. |
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Keywords: | biofilm kinetic parameters monitoring nitrification respirometry |
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