Long-term nitrite-oxidizing bacteria suppression in a continuous activated sludge system exposed to frequent changes in pH and oxygen set-points
| Primer Autor |
Antileo, Christian
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| Co-autores |
Jaramillo, Francisco
Candia, Oscar
Osorio, Aahilyn
Munoz, Carlos
Farias, Jorge
Proal- Najera, Jose B.
Zhang, Qiqi
Geissen, Sven -Uwe
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| Título |
Long-term nitrite-oxidizing bacteria suppression in a continuous activated sludge system exposed to frequent changes in pH and oxygen set-points
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| Editorial |
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
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| Revista |
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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| Lenguaje |
en
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| Resumen |
Research has proven the adaptation of nitrite-oxidizing bacteria to unfavorable environmental conditions, and this work presents a novel concept to prevent nitrite oxidation during partial nitrification in wastewater. The approach is based on the real-time updating of mathematical models of the process to search for optimal setpoints of pH and oxygen concentration in a continuous activated sludge reactor with a high sludge age (20.3 days). A heuristic optimization technique by 13 optimum set-points simultaneously maximized the degree of ammonia oxidation (alpha) and nitrite accumulation (beta), achieving an (alpha + beta) = 190% per day. The activated sludge reactor was conducted for 780 days under three control schemes: open-loop control, fuzzy model supervisory control and phenomenological supervisory control. The phenomenological supervisory control system achieved the best results, simultaneously reaching 95% ammonium oxidation and 90% nitrite accumulation. The Haldane kinetics were analyzed using steady-state concentrations of all nitrogen species, concluding that the simultaneous maximization of alpha + beta led to selecting set-points at the extreme values of the following ranges: pH = 7.5-8.5 and DO = 0.8-1.0 mg O2/L, which enabled the inhibition of one nitrifier species. At the same time, the other one was relieved from inhibition. The 16sRNA assays indicated that the nitrite-oxidizing bacteria presence (genera Nitrobacter and Nitrospira) shifted from 32% to less than 8% after 280 days of continuous operation with optimal pH and oxygen set-points.
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| Tipo de Recurso |
artículo original
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| Description |
Acknowledgements The authors acknowledge the funding provided by the Fondo Nacional de Desarrollo Cientfico y Tecnologico (Fondecyt) [grant number 1030317] .
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| doi |
10.1016/j.jenvman.2022.115545
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| Formato Recurso |
PDF
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| Palabras Claves |
Long -term partial nitrification
Intermittent kinetic inhibition
Continuous activated sludge reactor
Supervisory control
WASTE-WATER TREATMENT
PARTIAL NITRIFICATION
MICROBIAL COMMUNITY
NITRIFYING BACTERIA
SELECTION
REACTORS
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| Ubicación del archivo | |
| Categoría OCDE |
Ciencias Ambientales
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| Materias |
Nitrificación parcial a largo plazo
Inhibición cinética intermitente
Reactor de lodos activados continuo
Control de supervisión
TRATAMIENTO DE AGUAS RESIDUALES
NITRIFICACIÓN PARCIAL
COMUNIDAD MICROBIANA
BACTERIAS NITRIFIANTES
SELECCIÓN
REACTORES
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| Disciplinas de la OCDE |
Ingeniería Ambiental y Geológica
Microbiología
Robótica y Sistemas de Control Automático
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| Título de la cita (Recomendado-único) |
Long-term nitrite-oxidizing bacteria suppression in a continuous activated sludge system exposed to frequent changes in pH and oxygen set-points
|
| Identificador del recurso (Mandatado-único) |
artículo original
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| Versión del recurso (Recomendado-único) |
version publicada
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| Condición de la licencia (Recomendado-repetible) |
0
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| Derechos de acceso |
metadata
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| Access Rights |
metadata
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| Referencia del Financiador (Mandatado si es aplicable-repetible) |
ANID-FONDECYT 1030317
ANID FONDECYT 1030317
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| Id de Web of Science |
WOS:000820054900003
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