Effect of impeller type and mechanical agitation on the mass transfer and power consumption aspects of ASBR operation treating synthetic wastewater

Michelan, Rogério; Zimmer, Thiago Ruiz; Rodrigues, José Alberto Domingues; Ratusznei, Suzana Maria; Moraes, Deovaldo de; Zaiat, Marcelo; Foresti, Eugênio

doi:10.1016/j.jenvman.2008.08.003

Cited by 35 publications

(52 citation statements)

References 14 publications

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“…Figure 1 presents the scheme of the bioreactor with mechanical stirring (New Brunswick Scientific model Bioflo 110 ® ), which was composed of a glass vessel of 20 cm in diameter and 30 cm in height, with a total volume of 7.5 L and a useful capacity of 6.0 L. The support material was confined in a pierced stainless steel-316 container of 18 cm in height and 7.0 cm and 17.5 cm of internal and external diameter, respectively. Fixed stirring at 300 rpm was implemented via a motor connected to the turbine type impellers of 6 cm in diameter, composed of two sets of six plane blades (Rushton pattern) installed at 8 and 16 cm from the bottom of the vessel (Michelan et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

AnSBBR applied to biomethane production for vinasse treatment: effects of organic loading, feed strategy and temperature

Almeida

Ratusznei

Zaiat

et al. 2017

Braz. J. Chem. Eng.

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-This study assessed the feasibility of an anaerobic sequencing batch and fed-batch biofilm reactor (AnSBBR) with mechanical stirring for vinasse treatment and biomethane production. The amount of liquid medium used was 3 L, and the treated volume was 1 L per cycle. The cycle time was 8 h, with feeding times of 10 min (batch mode) and 240 min (fed-batch mode). Methane productivity increased with the increase in organic load from 1.0 to 10.0 gCOD.L (88% of the theoretical), respectively. These parameters were lower in fed-batch mode than in batch mode and were lower at 45°C than at 30°C due to biomass adaptation. In general, the values of the kinetic parameters increased with organic load and were similar for the batch and fed-batch modes. Therefore, the increase in organic load positively influenced the process by increased COD removal and lower volatile acids accumulation as the load increased. The batch mode performed better than did the fed-batch mode and 30°C was more suitable than 45°C to produce methane under the studied conditions.

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Section: Introductionmentioning

confidence: 99%

AnSBBR applied to biomethane production for vinasse treatment: effects of organic loading, feed strategy and temperature

Almeida

Ratusznei

Zaiat

et al. 2017

Braz. J. Chem. Eng.

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“…Velocidades más altas pueden reducir la actividad microbiana, debido a la fricción excesiva que daña la biomasa (Michelan et al, 2009) y causa la ruptura de los gránulos, lo que resulta en una baja separación de los sólidos (Bannari et al, 2011). Nurtono et al (2012) sugirieron el valor máximo de 0,66808 N/m² para la tensión de corte.…”

Section: Resultados Y Discusiónunclassified

Simulación de un Reactor Anaerobio Discontinuo utilizado para la Producción de Hidrógeno mediante Dinámica de Fluidos Computacional

et al. 2014

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ResumenSe ha evaluado el comportamiento hidrodinámico de un reactor de fermentación anaerobia a través de simulaciones numéricas tridimensionales, usando Dinámica de Fluidos Computacional con el software OpenFOAM ® . Se evaluaron dos condiciones de funcionamiento: una con régimen de circulación hacia abajo y otra en la dirección opuesta. Se consideró un modelo bifásico, transitorio y turbulento. Los resultados obtenidos con flujo de recirculación hacia arriba indican una optimización del proceso con este régimen. Esto implica una mayor porción turbulenta en el interior del biorreactor y una mejor mezcla sin comprometer la integridad de los gránulos. Palabras clave: dinámica de fluidos computacional (CFD), reactor anaerobio discontinuo (ASBR), hidrógeno, comportamiento hidrodinámico Simulation of an Anaerobic Sequencing batch Reactor for Hydrogen Production using Computational Fluid Dynamics AbstractThe fluid dynamic behavior of an anaerobic fermentation bioreactor through three-dimensional numerical simulations using Computational Fluid Dynamics with the software OpenFOAM ® has been studied. Two operating conditions were evaluated: one with a downward recirculating regime and another in the opposite direction. Results obtained with upward recirculating flow indicate an optimization of the process in this regime. This implies a larger turbulent region in the bioreactor and a better mixing without compromising the integrity of the flocs

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“…The operation of an ASBR takes place in a single tank and comprises the following steps: (i) filling with wastewater; (ii) biotransformations of the wastewater constituents by microbial activity; (iii) settling of the biological sludge after reaction termination; (iv) discharge of reactor (Pinheiro et al, 2008;Michelan et al, 2009). This sequence is repeated for each new batch and most of the operation time is spent in the microbial activity, when the liquid is continuously recirculated to improve mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interfacial Forces on the Mixture Prediction of an Anaerobic Sequencing Batch Reactor (Asbr)

Rosa

Maurina

Beal

et al. 2015

Braz. J. Chem. Eng.

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-In the operation of bioreactors, the fluid movement promotes mixing between sludge and substrate. The dynamics of this system are complex, and the interaction between the phases is difficult to evaluate accurately. In this work, Computational Fluid Dynamics is applied to simulate a pilot-scale anaerobic sequencing batch reactor, using a three-dimensional, transient and multiphase modeling. Several correlations were applied to estimate the interfacial forces. Results indicate that the use of different coefficients for the drag and lift forces strongly affects the predicted turbulent kinetic energy, and thus the mixture estimation in the bioreactor. The use of the drag as the only interfacial force provided an average turbulent kinetic energy close to the value found using a more complete model. However, the absence of lift and virtual mass forces had a significant impact on the resulting turbulence distribution.

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Effect of impeller type and mechanical agitation on the mass transfer and power consumption aspects of ASBR operation treating synthetic wastewater

Cited by 35 publications

References 14 publications

AnSBBR applied to biomethane production for vinasse treatment: effects of organic loading, feed strategy and temperature

AnSBBR applied to biomethane production for vinasse treatment: effects of organic loading, feed strategy and temperature

Simulación de un Reactor Anaerobio Discontinuo utilizado para la Producción de Hidrógeno mediante Dinámica de Fluidos Computacional

Influence of Interfacial Forces on the Mixture Prediction of an Anaerobic Sequencing Batch Reactor (Asbr)

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