Performance evaluation of an electrochemical reactor used to reduce Cr(VI) from aqueous media applying CFD simulations

Martínez-Delgadillo, Sergio A.; Mollinedo-Ponce, H.; Mendoza-Escamilla, Víctor X.; Torres, Claudia del Carmen Gutiérrez; Bernal, José Alfredo Jiménez; Barrera-Díaz, Carlos

doi:10.1016/j.jclepro.2011.10.036

Cited by 35 publications

(13 citation statements)

References 22 publications

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“…Computational fluid dynamics (CFD) has been widely used to model species transport, chemical reactions, and electric potential fields, making it a suitable tool to simulate electrochemical processes . Indeed, CFD has been used previously to investigate flow regimes and mass transfers in electrochemical reactors. ,,,− Huang et al simulated velocity profiles in a lab scale reactor with the model developed used to determine mass transfer coefficients and to assess their impacts on phenol degradation. Ibrahim et al used CFD tools to examine the effect of different flow rates on flow dynamics and showed that the presence of dead volume and short circuiting in the reactor decreased with an increase in the flow rate thereby resulting in more effective contaminant degradation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Anode Geometry on the Electrochemical Degradation of Ni-Ethylenediaminetetraacetic Acid Complexes Using Computational Fluid Dynamics Simulation

et al. 2022

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Anodic oxidation is a viable technology for the degradation of contaminants such as Ni-ethylenediaminetetraacetic acid (Ni-EDTA) complexes which are commonly found in wastewaters from the electroless plating industry. In an anodic oxidation process, the convective transport of the contaminant to the anode, which is affected by the hydrodynamic characteristics of the reactor and geometry of the electrodes, is crucial to the overall contaminant removal efficiency. In this work, a three-dimensional computational fluid dynamics (CFD) model was successfully developed to investigate flow behavior and its impact on the concentration profiles of Ni-EDTA complexes in a flow-through reactor during anodic oxidation of a synthetic wastewater containing these complexes. The CFD model was used to investigate the effect of electrode aperture size and shape on Ni-EDTA degradation with both simulation and experimental results indicating that, for the investigated system, the reduction of electrode aperture size enhanced the Ni-EDTA degradation rate by up to 1.4 times due to the increased rate of Ni-EDTA mass transfer to the electrode surface. A woven electrode exhibited the highest rate of Ni-EDTA degradation of the different anodes examined with the good performance in this case attributed particularly to the much more uniform Ni-EDTA concentration distribution and surface shear stress on the electrode surface. The CFD model developed in this study provided insights into the effect of electrode aperture geometry on mass transfer and subsequent contaminant removal efficiency and can be used more broadly for the optimization of anode design and reactor operation in electrochemical advanced oxidation processes.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Anode Geometry on the Electrochemical Degradation of Ni-Ethylenediaminetetraacetic Acid Complexes Using Computational Fluid Dynamics Simulation

et al. 2022

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“…Moreover, most of the simulations have been carried out using hexahedral cells, which are not suitable to map complex domains or those composed with accessories, and with impeller blades modeled as surfaces with zero thickness (zero thickness walls), which is an unrealistic simplification (Rutherford et al, 1996). As an alternative to map complex geometries, several works have implemented tetrahedral cells, i.e., domains with accessories such as a rotating ring electrode, for metal polluted water treatment (Martinez-Delgadillo et al, 2012), to analyze the flow patterns of a Max-Blend type impeller (Devals et al, 2008), among others. However, there is a lack of information about the performance of the different turbulence models in this kind of cell discretization under the same framework, for the flow induced by a PBT.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Different Rans Based Models to Describe the Turbulent Flow in an Agitated Vessel Using Non-Structured Grids and Piv Validation

Alonzo-García

Mendoza-Escamilla

Martínez-Delgadillo

et al. 2019

Braz. J. Chem. Eng.

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The performances of the Standard κ-ε, RNG, Realizable, κ-w and RSM turbulence models to describe the behavior of the flow in agitated tank reactors were evaluated. Because most of these tanks have complex geometries, structured meshing schemes are not a practical alternative in engineering. Two particular unstructured meshing schemes composed of either Cartesian Cut-Cell (CC) or Tetrahedral elements were tested in domains larger than 3 million cells. In this work, the blade thickness, which is usually disregarded, was accounted for. The performance of the turbulence models was validated by PIV measurements. A strong dependence on the grid size and the power number was found, with CC grids having good agreement with grids > 3.6 Million. The pumping number was independent of the cell number and the values agree with experimental data. The Realizable model resolved with a tetrahedral grid presented the overall best performance.

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“…To proffer solution to these, the current EC reactor with rotating anode was conducted to enhance the reactors' overall efficiency [7]. Additionally, the leading objective of the present work is to study the treatment of textile wastewater using a novel EC reactor under optimum operating conditions and to compare the performance with that of conventional EC reactor.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Textile Wastewater Using a Novel Electrocoagulation Reactor Design

Naje¹,

Ajeel²,

Alaba³

et al. 2018

Wastewater and Water Quality

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This study explored the best operating conditions for a novel electrocoagulation (EC) reactor with the rotating anode for textile wastewater treatment. The influence of operating parameters like interelectrode distance (IED), current density (CD), temperature, pH, operating time (RT) and rotation speed on the removal efficiency of the contaminant was studied. A comparative study was done using conventional model with static electrodes in two phases under same textile wastewater. The findings revealed that the optimal conditions for textile wastewater treatment were attained at RT = 10 min, CD = 4 mA/cm 2 , rotation speed = 150 rpm, temperature = 25°C, IED = 1 cm and pH = 4.57. The removal efficiencies of color, biological oxygen demand (BOD), turbidity, chemical oxygen demand (COD) and total suspended solid (TSS) were 98.50, 95.55, 96, 98 and 97.10%, respectively, within the first 10 min of the reaction. The results of the experiment reveal that the newly designed reactor incorporated with cathode rings and rotated anode impellers provide a superior treatment efficiency within a short reaction time. The novel EC reactor with a rotating anode significantly enhanced textile wastewater treatment compared to the conventional model. The values of adsorption and passivation resistance validated the pollutants removal rate.

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Performance evaluation of an electrochemical reactor used to reduce Cr(VI) from aqueous media applying CFD simulations

Cited by 35 publications

References 22 publications

Investigation of the Effects of Anode Geometry on the Electrochemical Degradation of Ni-Ethylenediaminetetraacetic Acid Complexes Using Computational Fluid Dynamics Simulation

Investigation of the Effects of Anode Geometry on the Electrochemical Degradation of Ni-Ethylenediaminetetraacetic Acid Complexes Using Computational Fluid Dynamics Simulation

On the Performance of Different Rans Based Models to Describe the Turbulent Flow in an Agitated Vessel Using Non-Structured Grids and Piv Validation

Treatment of Textile Wastewater Using a Novel Electrocoagulation Reactor Design

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