Numerical simulation and exploration of electrocoagulation process for arsenic and antimony removal: Electric field, flow field, and mass transfer studies

Song, Peipei; Song, Qisheng; Yang, Zhen; Zeng, Guangming; Xu, Haiyin; Li, Xin; Xiong, Weiping

doi:10.1016/j.jenvman.2018.09.001

Cited by 40 publications

(11 citation statements)

References 18 publications

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“…Besides, the increment in the current density increases the amounts of coagulants with a much more compact structure, resulting in a higher coagulation efficiency due to sweep coagulation . Also, electric field force increases at larger current density, promoting the ion transfer process, thus increasing the oil removal . The oil removal efficiency is already satisfactory at higher current, so the effect of POE on the separation process was relatively weakened.…”

Section: Resultsmentioning

confidence: 99%

“…28 Also, electric field force increases at larger current density, promoting the ion transfer process, thus increasing the oil removal. 10 The oil removal efficiency is already satisfactory at higher current, so the effect of POE on the separation process was relatively weakened.…”

Section: Energy and Fuelsmentioning

confidence: 99%

“…EC technology, which couples three fields of research, i.e., electric field study, flow field study, and mass transfer processes, is complicated and involves a multitude of mechanisms operating synergistically to remove pollutants from wastewater. , A sacrificial anode, commonly aluminum for oily sewage, is used to offer metal cations which immediately undergo further spontaneous hydrolysis reactions to form various monomeric species and polymeric species such as Al(OH) x 3– x or Al 2 (OH) x 6– x , respectively, which eventually converted to amorphous Al(OH) 3 (s). Simultaneously, hydrogen is generated at the cathode, which aids the removal process. − …”

Section: Introductionmentioning

confidence: 99%

“…7,8 As an alternative, electrocoagulation (EC) technology, characterized as high efficiency, environmentally friendly, and operating automatically, has gained increasing popularity by industry. 9 EC technology, which couples three fields of research, i.e., electric field study, flow field study, and mass transfer processes, is complicated 10 and involves a multitude of mechanisms operating synergistically to remove pollutants from wastewater. 11,12 A sacrificial anode, commonly aluminum for oily sewage, is used to offer metal cations which immediately undergo further spontaneous hydrolysis reactions to form various monomeric species and polymeric species such as Al(OH) x 3−x or Al 2 (OH) x 6−x , respectively, which eventually converted to amorphous Al(OH) 3 (s).…”

Section: Introductionmentioning

confidence: 99%

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Performance Investigation of an Electrocoagulation Reactor with Electrodes’ Polarity Crossly Oriented in Emulsified Oil Separation

2019

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This work aimed to separate emulsified oil from oily sewage by electrocoagulation (EC). The research was carried out in a continuous system with aluminum electrodes. The effect of electrodes placement, including tilt angle of parallel-plate electrodes (APE) and electrodes’ polarity orientation (POE), on EC performance (oil removal and energy consumption) was studied. A novel reactor, within which the electrodes with polarity crossly oriented (PC) was compared to that with electrodes’ polarity identically oriented (PI) under different running conditions, as the APE, applied current density, flow rate, and electrode distance. To throw light upon the difference of reaction rate between PC and PI performance, a first-order kinetics equation was established. The results show that the PC system was more efficient than the PI system, particularly at lower current densities. At optimum conditions (current density of 140 A/m2, electrolysis time of 140 min, a flow rate of 5 L/h, and APE of 76°), 97.6% of emulsified oil was removed in the PC system with the energy consumption of 0.869 kW·h/m3. By contrast, the removal efficiency in the PI system only reached 91.4%, which was 6.2% lower than that in the PC system. Besides, it can be found that the entire EC process can be divided into two stages: start-up stage and steady state. The higher the current density and the flow rate, the shorter the start-up time. Evaluation of the effects of APE indicates that there exists an optimum tilt angle of electrodes at which the EC performance was better than any other tilt angles studied.

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Section: Resultsmentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Investigation of an Electrocoagulation Reactor with Electrodes’ Polarity Crossly Oriented in Emulsified Oil Separation

2019

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“…While rapid technological development has the advantage of improving society, the economy, and a population's quality of life, it is also increase environmental pollution and causes adverse effects on human health and ecosystem balance. [1,2] Electrocoagulation is a promising method for removing both organic pollutants [3][4][5][6][7] and inorganic pollutants [8][9][10][11][12] due to its cost effectiveness, high removal efficiency, in situ coagulant formation, and automation feasibility. [5,13] Regardless of these advantages, applying the electrocoagulation mechanism is controversial because coagulants can form in situ depending on the electrode material, pollutant type, solution pH, and coexisting ion effects.…”

Section: Introductionmentioning

confidence: 99%

Formation of Arsenic Minerals in Aqueous Media During Electrocoagulation using Iron Electrodes

2022

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Complex solid residuals can form during the electrocoagulation of arsenic from aqueous media based on the characteristics of the electrochemical system and cooccurring processes, such as adsorption, hydrolysis, chemical precipitation, and flotation. Herein, we study the composition and behaviors of solid residuals produced after electrocoagulation with iron electrodes in various solution media at pH 3, 7 and 10. The instrumental analysis including FTIR, XRD and SEM show that different minerals were formed by electrocoagulation depending on the pH of the solution, and they included scorodite (FeAsO 4 ⋅2H 2 O), symplesite (Fe 3 (AsO 4 ) 2 ⋅8H 2 O), and parasymplesite (Fe 3 (AsO 4 ) 2 ⋅8H 2 O) under acidic conditions; scorodite and kaatialaite (Fe(H 2 AsO 4 ) 3 ⋅5H 2 O) under neutral conditions; and scorodite, symplesite, parasymplesite, and schneiderhoehnite (FeFe 3 As 5 O 13 ) under alkaline conditions. The behaviors of solid residues on distilled water and acidic and alkaline solutions show that adsorption and chemical precipitation occurred simultaneously during the electrocoagulation of arsenic in aqueous media in the different reaction media.

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Hydrodynamic Simulation and Analysis Using Computational Fluid Dynamics: Electrochemical Reactors and Redox Flow Batteries

Meena,

Kumar,

Soni

2023

ChemBioEng Reviews

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State‐of‐the‐art applications of computational fluid dynamics (CFD) in the analysis and optimization of electrochemical reactors and redox flow batteries are reviewed. Various factors are covered which affect the efficiency of electrochemical reactors and redox flow batteries created using CFD simulation approaches, including physical and chemical factors, such as pH, treatment time, temperature, and the conductivity of the solution, as well as design elements like inter‐electrode distance and electrode materials. Different hydrodynamic variables are discussed that impact the efficiency of these systems, such as pressure distribution, velocity, tracer mass fraction, geometry, flow‐based electrochemical energy storage, and residence time distribution. Although CFD methods are reliable, more straightforward, and cost‐effective, also the limitations of CFD and the challenges are considered that remain in its development and application in electrochemical engineering. The significant progress made in the use of CFD to study electrochemical reactors and redox flow batteries and the technology's potential to improve the efficiency and sustainability of these technologies are emphasized.

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Numerical simulation and exploration of electrocoagulation process for arsenic and antimony removal: Electric field, flow field, and mass transfer studies

Cited by 40 publications

References 18 publications

Performance Investigation of an Electrocoagulation Reactor with Electrodes’ Polarity Crossly Oriented in Emulsified Oil Separation

Performance Investigation of an Electrocoagulation Reactor with Electrodes’ Polarity Crossly Oriented in Emulsified Oil Separation

Formation of Arsenic Minerals in Aqueous Media During Electrocoagulation using Iron Electrodes

Hydrodynamic Simulation and Analysis Using Computational Fluid Dynamics: Electrochemical Reactors and Redox Flow Batteries

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