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Bioresour Technol ; 220: 369-377, 2016 Nov.
Article in English | MEDLINE | ID: mdl-27595702

ABSTRACT

The aim of the present work was to study the growth of two nitrifying bacteria. For modelling the nitrifying subsystem of the MELiSSA loop, Nitrosomonas europaea ATCC® 19718 and Nitrobacter winogradskyi ATCC® 25931 were grown separately and in cocultures. The kinetic parameters of a stoichiometric mass balanced Pirt model were identified: µmax=0.054h(-1), decay rate b=0.003h(-1) and maintenance rate m=0.135gN-NH4(+)·gX(-1)·h(-1) for Nitrosomonas europaea; µmax=0.024h(-1), b=0.001h(-1) and m=0.467gN-NO2(-)·gX(-1)·h(-1) for Nitrobacter winogradskyi. A predictive structured model of nitrification in co-culture was developed. The online evolution of the addition of KOH is correlated to the nitritation; the dissolved oxygen concentration is correlated to both nitritation and nitratation. The model suitably represents these two variables so that transient partial nitrification is assessed. This is a clue for avoiding partial nitrification by predictive functional control.


Subject(s)
Models, Theoretical , Nitrobacter/growth & development , Nitrosomonas europaea/growth & development , Bacteria , Bioreactors , Coculture Techniques , Kinetics , Nitrification , Nitrobacter/metabolism , Nitrosomonas/growth & development , Nitrosomonas europaea/metabolism
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