The aim of this work was to evaluate bioaugmentation with nitrifiers at pilot scale using two membrane bioreactors (MBRs) in order to assess the suitability of the state-of-the-art of activated sludge models (ASM) in predicting the efficiency of bioaugmentation as a function of operating conditions. It was verified that the difference of temperature between seeding and seeded reactors (ΔT) is affecting bioaugmentation efficiency and that the experimental data can be accurately simulated when ΔT is within a range of about 10 °C. When the temperature is significantly lower in the seeded reactor than in the seeding one, standard ASMs overestimate bioaugmentation efficiency. An ASM able to accurately represent the behaviour of seeded nitrifying biomass in the presence of high ΔT will require the inclusion of mathematical modelling of the effect of temperature time gradients on nitrifiers that can be simulated, as the first step with an increase of Arrhenius temperature correction factor of the seeded biomass.
Modeling bioaugmentation with nitrifiers in membrane bioreactors / Alberto Mannucci; Giulio Munz; Gualtiero Mori; Jacek Makinia; Claudio Lubello; Jan A Oleszkiewicz;. - In: WATER SCIENCE AND TECHNOLOGY. - ISSN 0273-1223. - STAMPA. - 71:(2015), pp. 15-21. [10.2166/wst.2014.456]
Modeling bioaugmentation with nitrifiers in membrane bioreactors
MANNUCCI, ALBERTO;MUNZ, GIULIO;LUBELLO, CLAUDIO;
2015
Abstract
The aim of this work was to evaluate bioaugmentation with nitrifiers at pilot scale using two membrane bioreactors (MBRs) in order to assess the suitability of the state-of-the-art of activated sludge models (ASM) in predicting the efficiency of bioaugmentation as a function of operating conditions. It was verified that the difference of temperature between seeding and seeded reactors (ΔT) is affecting bioaugmentation efficiency and that the experimental data can be accurately simulated when ΔT is within a range of about 10 °C. When the temperature is significantly lower in the seeded reactor than in the seeding one, standard ASMs overestimate bioaugmentation efficiency. An ASM able to accurately represent the behaviour of seeded nitrifying biomass in the presence of high ΔT will require the inclusion of mathematical modelling of the effect of temperature time gradients on nitrifiers that can be simulated, as the first step with an increase of Arrhenius temperature correction factor of the seeded biomass.
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