Kinetics of syntrophic acetogenesis in a saline medium

Huiliñir, César; Roa, Erick; Vargas, Daniela Sandino; Roeckel, Marlene; Aspé, Estrella

doi:10.1002/jctb.1967

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…Parameter estimation was performed using nonlinear regression techniques based on the Levenberg–Marquardt least‐squares minimization algorithm . To verify the goodness of fit to the proposed mathematical model, two statistical metrics were used, the traditional coefficient of determination ( R 2 ) and the Nash–Sutcliffe efficiency (NSE).…”

Section: Methodsmentioning

confidence: 99%

Modeling pH and temperature effects on the anaerobic treatment of tequila vinasses

Moguel-Castañeda

Puebla

Méndez‐Acosta

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND An unstructured mathematical model is proposed to evaluate the effect of key variables on the anaerobic digestion of tequila vinasses and to determine the operating conditions that improve biogas production. Most of the models currently reported do not consider the simultaneous effects of pH and temperature on the process kinetics. Instead, they only recognize the specific operational conditions under which the experiments were conducted. Hence, this work presents a mathematical model that considers the effects of pH and temperature on methane production. RESULTS Experimental data were obtained from the anaerobic treatment of tequila vinasses conducted in a sequencing batch reactor, which was evaluated at two temperatures (32 and 38 °C) and two pH values (7 and 8) to validate the proposed model. Parameter estimation was performed using the Levenberg–Marquardt algorithm yielding a simplified model with high determination coefficients (R2 > 0.99). Moreover, kinetic parameters estimated were consistent physically and statistically. CONCLUSIONS Numerical simulations provide the operating conditions under which methane production can be favored. Therefore, the proposed model might be advantageous in predicting the maximum methane production rate and the maximum organic loading rate that could be used without risking the stability of an anaerobic digestion process. © 2020 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Modeling pH and temperature effects on the anaerobic treatment of tequila vinasses

Moguel-Castañeda

Puebla

Méndez‐Acosta

et al. 2020

J of Chemical Tech & Biotech

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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

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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“…In the original AM, acetogenesis of HVa and HBu is performed by different microorganism groups; however given that the kinetics of both processes in a saline, mesophilic environment are similar , the model can be simplified by assuming that HVa and HBu are degraded by a single microorganism group (Batstone et al, 2002). The kinetics used for the acetogenic steps were obtained from Huiliñir et al (2008).…”

Section: Angelidaki's Model Modificationmentioning

confidence: 99%

“…A pH lower than 6 and higher than 9 can inhibit both the acetogenic stage (Campos and Flotats, 2003;Huiliñir et al, 2008) and the denitrification process (Estuardo et al, 2008). Furthermore, the pH affects the non-dissociated fraction of NH 3 , which in turn inhibits the methanogenic stage.…”

Section: Introductionmentioning

confidence: 98%

Modeling of the denitrification/anaerobic digestion process of salmon fishery wastewater in a biofilm tubular reactor

Huiliñir

Aspé

Roeckel

2011

Journal of Environmental Management

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Kinetics of syntrophic acetogenesis in a saline medium

Cited by 9 publications

References 20 publications

Modeling pH and temperature effects on the anaerobic treatment of tequila vinasses

Modeling pH and temperature effects on the anaerobic treatment of tequila vinasses

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

Modeling of the denitrification/anaerobic digestion process of salmon fishery wastewater in a biofilm tubular reactor

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