Improvement of nitrate and nitrite reduction rates prediction

Estuardo, Carolina; Martí, M. Cristina; Huilinir, Cesar; Lillo, Estrella Aspe; Roeckel, Marlene

doi:10.2225/vol11-issue3-fulltext-6

Cited by 18 publications

(17 citation statements)

References 10 publications

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“…2). Several kinetic models have been previously proposed to describe denitritation [20,[25][26][27][28]. Often, accumulation of nitrite during denitrification and the consequent inhibition has been considered in such models [24,29].…”

Section: Modeling Denitritation Kineticsmentioning

confidence: 99%

Investigating the kinetics of autotrophic denitrification with thiosulfate: Modeling the denitritation mechanisms and the effect of the acclimation of SO-NR cultures to nitrite

Mora

Dorado

Gamisans

et al. 2015

Chemical Engineering Journal

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In this work the kinetics of a number of sulfide-oxidizing nitrate-reducing (SO-NR) cultures acclimated and not acclimated to nitrite were characterized. Anoxic respirometry coupled to kinetic modeling of respirometric profiles was the methodology used to study the two-step denitrification associated to thiosulfate oxidation. Autotrophic denitritation was initially studied in a non-acclimated SO-NR culture to confirm that nitrite reduction kinetics could be described through a Haldane-type equation. Afterwards, a kinetic model describing the two-step denitrification (NO 3 -→ NO 2 -→ N 2 ) was calibrated and validated through the estimation of several kinetic parameters from the fitting of experimental respirometric profiles obtained using either nitrate or nitrite as electron acceptors for both acclimated and non-acclimated biomass. The model proposed was a multi-substrate model that considered all the species implicated in the process as well as the stoichiometry associated particularly to the biomass studied in this work. A comparison between the kinetic parameters with the biomass acclimated and nonacclimated to nitrite revealed a 7-fold increase of the Haldane nitrite inhibition constant in the acclimated biomass with respect to the non-acclimated while the nitrite half-saturation constant and the maximum specific growth rate remained almost unchanged. The Fisher Information Matrix method was used to obtain the confidence intervals and also to evaluate the sensitivity and the identifiability in model calibration of each kinetic parameter estimated.

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Section: Modeling Denitritation Kineticsmentioning

confidence: 99%

Investigating the kinetics of autotrophic denitrification with thiosulfate: Modeling the denitritation mechanisms and the effect of the acclimation of SO-NR cultures to nitrite

Mora

Dorado

Gamisans

et al. 2015

Chemical Engineering Journal

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“…At all tested levels of salinity, the effluent nitrites generally dominated over nitrates. Also, an accidental decrease of COD:N dosage to The pH in this experiment was maintained at values 7.4-7.8, corresponding to a previously published optimum for denitrification (Estuardo et al 2008). However, pH values affect also the metabolic preferences between reduction of nitrates and nitrites.…”

Section: Continuous Testmentioning

confidence: 82%

Removal of nitrates from high-salinity wastewaters from desulphurization process with denitrifying bacteria encapsulated in Lentikats Biocatalyst

Trögl

Krhůtková

Pilařová

et al. 2012

Int. J. Environ. Sci. Technol.

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Successful elimination of high concentrations of N-NO x-(up to 250 mg/L) from high salinity wastewaters (up to 35 g/L Cl -? 17 g/L SO 4 2-) originating from desulphurization process within coal power stations was achieved using pure cultures of denitrifying bacteria encapsulated in porous polyvinyl alcohol lenses (so called Lentikats Biocatalyst, LB). Laboratory batch tests revealed inhibitory influence of the raw wastewater on the denitrification activity, which was partially mitigated by the addition of P-PO 4 3-. In following continuous tests, the denitrification activities reached the range 150-450 mg N/ h/kg LB, i.e., values suitable for industrial scale applications. The higher activities were achieved under a lower salinity, higher N-NO x -influent concentrations and a prolonged retention time. The effluent N-NO x -concentrations were below the determination limit of 5 mg/L. After a period of 3 months, a significant decrease of denitrification activity of Lentikats Biocatalyst was observed. Addition of nutrients into the wastewater enabled fast regeneration of the initial activity. The overall results proved the applicability of Lentikats Biocatalysts for the removal of nitrates from high-salinity desulphurization water and other industrial wastewaters of similar character.

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“…El pH registrado en los 12 meses en todos los pretratamientos a excepción del alcalino, en promedio varió entre 6 y 7,5, que es adecuado para que en los digestores efectuaran proceso de digestión anaeróbica, ya que cuando el pH es >6 ó <9 se inhibe el proceso de acetogénesis (Patrick & Wyatt, 1964;Campos & Flotats, 2003;Huiliñir et al, 2008), metanogénesis (Boe, 2006;Turovskiy & Mathai, 2006) y la desnitrificación (Estuardo et al, 2008). La disminución del pH se encuentra inherentemente asociada a la producción de ácidos grasos volátiles (AGV) durante la digestión anaeróbica (STORA, 1985).…”

Section: Discusión Factores Físicos Y Químicosunclassified

“…El pH > 6 en todos los experimentos, tuvo un efecto en la remoción de N-NO2 -y N-NO3 -en todos los pretratamientos al favorecer el crecimiento de los microorganismos anaeróbicos y desnitrificadores (Campos & Flotats, 2003;Estuardo et al, 2008). La temperatura también tuvo un papel importante en la tasa de desnitrificación en los reactores anaeróbicos, el cambio de temperatura de 10 a 35°C, incidió en un aumento de la tasa de desnitrificación, de 1,5 a 3 veces (Dawson & Murphy, 1972;Bailey & Beauchamp, 1973;Stanford et al, 1975).…”

Section: Nitritos Y Nitratosunclassified

Efecto de cuatro pretratamientos en la digestion anaerobica y la remocion de nutrientes de efluentes, de un sistema de recirculacion acuicola

González-Hermoso

Segovia

2017

lajar

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RESUMEN. Los sistemas de recirculación acuícola producen efluentes (fracción disuelta y fracción particulada) con altas concentraciones de nitrógeno y fósforo que son una fuente potencial de contaminación si no se tratan en forma adecuada. El tratamiento de los lodos y remoción de nutrientes por medio de la digestión anaeróbica se ha vuelto una alternativa viable para la reducción y la estabilización de los lodos provenientes de los sistemas de recirculación acuícola. El presente estudio determinó el efecto de cuatro diferentes pretratamientos (alcalino, mecánico, térmico y biológico) en la reducción de los lodos, la desnitrificación, la producción de biogás y la dinámica del nitrógeno y el fósforo proveniente de los efluentes de un cultivo de tilapia nilótica (Oreochromis niloticus, Linnaeus, 1758) en condiciones hiper-intensivas con experimentos mensuales durante un año, con duración de 15 días cada uno. Tras la aplicación de pretratamientos en los lodos de origen acuícola, se obtuvo un aumento en la liberación de nitrógeno amoniacal total con respecto al control, de igual forma se obtuvo una remoción de nitritos en todos los pretratamientos (˃90%), se incrementó la remoción de sólidos suspendidos totales, siendo mayor en los pretratamientos (˃20,3%) en comparación con el control (14,6%), así como también se incrementó la producción de biogás, siendo el pretratamiento biológico donde se obtuvo la mayor concentración (45,18 cm 3 L -1). Esto indica que la aplicación de pretratamientos en los efluentes acuícolas mejora los procesos de desnitrificación y digestión anaeróbica, pudiendo reducir los tiempos de retención hidráulica. Palabras clave: desnitrificación, digestión anaeróbica, pretratamientos, efluentes, sistema de recirculación. Effect of four different pretreatments in anaerobic digestion and nutrientremoval of effluents from a recirculating aquaculture system ABSTRACT. Intensive aquaculture recirculating systems produce effluents (dissolved and particulate solids) with concentrations of nitrogen and phosphorus, a potential source of pollution if they are not properly treated. The sludge and nutrient removal by anaerobic digestion has become an alternative for aquaculture sludge digestion and stabilization. In this study we determine the effect of four different pretreatments (alkaline, mechanical, thermal and biological) in sludge reduction and denitrification efficiency, biogas production and nitrogen and phosphorus dynamics from a hyper-intensive Nile tilapia (Oreochromis niloticus, Linnaeus, 1758) culture in 15 days experiments, one per month for one year. After application of pretreatments in aquaculture sludge, an increase in the release of total ammonia nitrogen was obtained with respect to the control, in the same way nitrate removal was obtained in all pretreatments (˃90%), The increase in total suspended solids removal was higher in pretreatment (˃20.3%) compared to control (14.6%), As well as the biogas production increase, being the biological pre-treatment where the highest concentration was ...

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Improvement of nitrate and nitrite reduction rates prediction

Cited by 18 publications

References 10 publications

Investigating the kinetics of autotrophic denitrification with thiosulfate: Modeling the denitritation mechanisms and the effect of the acclimation of SO-NR cultures to nitrite

Investigating the kinetics of autotrophic denitrification with thiosulfate: Modeling the denitritation mechanisms and the effect of the acclimation of SO-NR cultures to nitrite

Removal of nitrates from high-salinity wastewaters from desulphurization process with denitrifying bacteria encapsulated in Lentikats Biocatalyst

Efecto de cuatro pretratamientos en la digestion anaerobica y la remocion de nutrientes de efluentes, de un sistema de recirculacion acuicola

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