Modeling of Nitrification Under Substrate-Inhibiting Conditions

A mathematical model was developed for the biological-nitrification process. The model assumed two consecutive oxidation steps occurring under a substrate-inhibiting condition. The mathematical model was calibrated using data obtained from batch experiments performed on the contents of five chemosta...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 1990-01, Vol.116 (1), p.18-31
Main Authors: Gee, Chai Sung, Suidan, Makram T, Pfeffer, John T
Format: Article
Language:English
Subjects:
AMMONIA
AMMONIAC
AMONIACO
Applied sciences
BACTERIA
Biological and medical sciences
Biological treatment of waters
Biotechnology
CULTURE MEDIA
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General purification processes
Industrial applications and implications. Economical aspects
INHIBICION
INHIBITION
MATHEMATICAL MODELS
MEDIO DE CULTIVO
MILIEU DE CULTURE
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
NITRATE
NITRATES
NITRATOS
NITRIFICACION
NITRIFICATION
NITRITE
NITRITES
NITRITOS
NITROBACTER
NITROSOMONAS
OXIDACION
OXIDATION
OXYDATION
Pollution
TECHNICAL PAPERS
Wastewaters
Water treatment and pollution
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Summary:A mathematical model was developed for the biological-nitrification process. The model assumed two consecutive oxidation steps occurring under a substrate-inhibiting condition. The mathematical model was calibrated using data obtained from batch experiments performed on the contents of five chemostats operated to steady-state on a feed containing 1,000 mg L of ammonia-nitrogen. In the batch experiments, initial ammonia concentrations ranging from 100 to 1,000 mg-N L were used. Time-varying concentrations of ammonia and nitrite were collected until the oxidation of these constituents was complete. Parameter sets that optimized the fit on the mathematical model to the experimental data were obtained by nonlinear-regression analyses. The oxidation of ammonia to nitrite was well represented by the Haldane-inhibition model. The Haldane-inhibition model did not satisfactorily describe the oxidation of nitrite to nitrate. It was observed that the simultaneous presence of both nitrite and ammonia led to the inhibition of nitrite oxidation. Modification of the model to consider a revised inhibition mechanism that accounted for the observed behavior was quite successful for the interpretation of the nitrite-oxidation data.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(1990)116:1(18)