Dynamic modelling of nitrification in an aerated facultative lagoon

Houweling, Dwight; Kharoune, Lynda; Escalas, A.; Comeau, Yves

doi:10.1016/j.watres.2007.07.034

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Loading rates, temperature evolution, and nitrate production were not documented in Wang et al (2012). Similarly, Houweling et al (2008) assessed, using a mathematical model, the potential of both bioaugmentation (autotroph addition) and increased DO on nitrification in aerated lagoons. The simulation results, which were obtained with a temperature evolution very similar to the one observed in the present study, showed that both alternative techniques were not as efficient as biofilm addition to extend the nitrification period when water temperature is decreasing.…”

Section: Research Articlementioning

confidence: 99%

“…Current design criteria for this type of technology are not selected in view of achieving nitrification, even if their design includes long retention times (hydraulic and solids). However, since their vast surface renders them sensitive to seasonal variations of temperature, partial or complete seasonal nitrification is likely to occur (Houweling, Kharoune, Escalas, & Comeau, 2008). When temperature is sufficiently high, the growth rate of autotrophic nitrifying bacteria becomes higher than the rate of biomass wastage, thus enabling nitrification.…”

Section: Introductionmentioning

confidence: 99%

“…However, these complementary systems require additional reaction volume which results in a potentially restrictive increase in the footprint of the facility. Enhancement of the original lagoon with bioaugmentation or increased dissolved oxygen (DO) has also been evaluated (Houweling et al, 2008). Model simulations of these solutions found them to significantly increase the duration of the nitrification period.…”

Section: Introductionmentioning

confidence: 99%

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Nitrification in a biofilm‐enhanced highly loaded aerated lagoon

Patry

Lessard

Vanrolleghem

2019

Water Environment Research

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A full-scale biofilm-enhanced aerated lagoon using fixed submerged media was monitored using automated water quality monitoring stations over the span of one year to quantify its nitrification performance. The system was operating at a high organic loading rate averaging 5.8 g total CBOD 5 /m 2 of media per day (23.9 g total CBOD 5 /m 3 of lagoon per day), a total ammonia nitrogen loading rate averaging 0.9 g NH 4-N/m 2 day (3.7 g NH 4-N/m 3 day), and temperatures ranging from 1.6 to 20.8°C. The system showed an extended seasonal nitrification period compared with a simulated aerated lagoon system of the same dimensions. This extension of complete nitrification with approximately 1 month was observed in the fall despite the decrease of operating temperature down to 4°C. During this maximum nitrification period, substantial denitrification occurred, and the effluent un-ionized ammonia ratio was reduced. A temporary loss of nitrification was also experienced in relation to an episode of elevated suspended solids concentration. Measured biofilm characteristics, namely the detachment dynamics and the biofilm thickness, were used to explain this temporary nitrification loss. During wintertime, a low nitrate production was still observed, suggesting yearlong retention of nitrifying bacteria in the biofilm.

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Section: Research Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrification in a biofilm‐enhanced highly loaded aerated lagoon

Patry

Lessard

Vanrolleghem

2019

Water Environment Research

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“…In the scope of AFL dynamic modeling, there are very few studies published on the scientific literature, most focused primarily on hydrodynamic aspects [9]- [17], other models include the wastewater composition and their transformation processes, but in most of these models the complexity is such that they require advanced waste- water characterization as well as specialized software [18]- [27]. Despite their complexity, these models have not been able to describe the complex behavior of organic matter/oxygen demand in the AFL in a precise or proper manner.…”

Section: Aerated Facultative Lagoon Modelsmentioning

confidence: 99%

Evaluation of Three Dynamic Models for Aerated Facultative Lagoons

Ábrego-Góngora¹,

Briones-Gallardo²,

Bernal-Jácome³

et al. 2015

JWARP

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In this research, three existing dynamic mathematical models for aerated lagoons were applied to an aerated facultative lagoon (AFL) plant for municipal wastewater treatment. The models' ability to describe the behavior of the primary lagoon was evaluated, and the advantages and limitations of the three models were compared. For this purpose, 7-year operational data from the municipal WWTP were collected and processed; other necessary data-like dynamic temperature valueswere estimated. A 2-year period was used for model calibration, while the remaining 5 years served as validation period. One of the models showed poor calibration fit values in the effluent concentration description (R 2 of 0.242 and RMSE of 16.8 mg/L); however, with some modifications the adjust was enhanced (R 2 of 0.409 and RMSE of 14.0 mg/L); a second model displayed a poor to moderate adjust (0.489 and 13.0 mg/L, respectively), and the third model achieved a moderate fit (0.528 and 11.9 mg/L), though it provided an overestimation of effluent concentration, especially in periods of heavy and frequent rain; this model with some adaptations the adjust was enhanced (R 2 of 0.575 and RMSE of 11.4 mg/L). The validation fits are even lower, illustrating the inability of these models to properly describe the AFL behavior. The possible causes of the models' inadequacy are discussed. Finally, it is established that in terms of AFL behavior description more research and model development are needed.

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“…Un proceso de simulación-modelación puede explicar dichas relaciones, haciéndolo una herramienta útil para su análisis (Jamu y Piedrahita, 2002). Para analizar una LFS es posible apelar a procedimientos matemáticos que analicen los fenómenos multidimensionales (Legendre y Legendre, 2004) que suceden en estos complejos ecosistemas; el modelado puede integrar variables hidrodinámicas y cinéticas y es una herramienta con amplias posibilidades en el campo del tratamiento de las aguas residuales (Zima et al, 2009;Alvarado et al, 2012;Sah, 2009;Beran y Kargi, 2005;Houweling et al, 2008;Abbas et al, 2006). Disponer de modelos de LFS que conjuguen su ecología, incorporen sus propiedades dinámicas, componentes y variables (Jamu y Piedrahita, 2002) posibilitará la búsqueda de un ambiente sano con criterios de justicia ambiental (Rees, 2008).…”

Section: Introductionunclassified

Desarrollo de modelos ecológicos para carbono y nitrógeno en lagunas facultativas secundarias

Alexander¹

2014

Ingeniería, Investigación y Tecnología

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Dynamic modelling of nitrification in an aerated facultative lagoon

Cited by 6 publications

References 11 publications

Nitrification in a biofilm‐enhanced highly loaded aerated lagoon

Nitrification in a biofilm‐enhanced highly loaded aerated lagoon

Evaluation of Three Dynamic Models for Aerated Facultative Lagoons

Desarrollo de modelos ecológicos para carbono y nitrógeno en lagunas facultativas secundarias

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