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
Co-autores
Jaramillo, Francisco
Candia, Oscar
Osorio, Aahilyn
Munoz, Carlos
Farias, Jorge
Proal- Najera, Jose B.
Zhang, Qiqi
Geissen, Sven -Uwe
Título
Long-term nitrite-oxidizing bacteria suppression in a continuous activated sludge system exposed to frequent changes in pH and oxygen set-points
Editorial
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Revista
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Lenguaje
en
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.
Tipo de Recurso
artículo original
Description
Acknowledgements The authors acknowledge the funding provided by the Fondo Nacional de Desarrollo Cientfico y Tecnologico (Fondecyt) [grant number 1030317] .
doi
10.1016/j.jenvman.2022.115545
Formato Recurso
PDF
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
Ubicación del archivo
http://dx.doi.org/10.1016/j.jenvman.2022.115545
Categoría OCDE
Ciencias Ambientales
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
Disciplinas de la OCDE
Ingeniería Ambiental y Geológica
Microbiología
Robótica y Sistemas de Control Automático
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
Versión del recurso (Recomendado-único)
version publicada
Condición de la licencia (Recomendado-repetible)
0
Derechos de acceso
metadata
Access Rights
metadata
Referencia del Financiador (Mandatado si es aplicable-repetible)
ANID-FONDECYT 1030317
ANID FONDECYT 1030317
Id de Web of Science
WOS:000820054900003
Colecciones
Colección Publicaciones Científicas
Colección ANID
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