Electrochemical dissolution of aluminium in electrocoagulation experiments

Fekete, Éva; Lengyel, B.; Cserfalvi, T.; Pajkossy, Tamás

doi:10.1007/s10008-016-3195-6

Cited by 35 publications

(17 citation statements)

References 20 publications

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“…Similarly, current densities were 43.96, 32.97, 21.98, 16.48, and 10.99, corresponding to the distance of 1, 2, 3, 4, and 5 cm for S1. Current density reduction with the increase of electrode distance was also observed by Phan et al [20], and further mentioned by Thella et al [21] as a consequence of resistance increase; (ii) the decrease in the electrostatic attraction that caused a slower movement of the generated ions [17] leading to the lower removal efficiency of pollutants since Fekete et al [22] found that the dissolved Al from anode being active as a coagulant for seconds only after its formation; and (iii) the diminution of mass transfer in the reactor [5].…”

Section: Effect Of Electrode Distancementioning

confidence: 56%

Application of Electrocoagulation for Printing Wastewater Treatment: From Laboratory to Pilot Scale

Thủy

Xuan

Thành

et al. 2021

J. Electrochem. Sci. Technol

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This study reports for the first time the application of electrocoagulation (EC) from laboratory to pilot scales for the treatment of printing wastewater, a hazardous waste whose treatment and disposal are strictly regulated. The wastewater was taken from three real printing companies with strongly varying characteristics. The treatment process was performed in the laboratory for operational optimization and then applied in the pilot scale. The weight loss of the electrode and the generation of sludge at both scales were compared. The results show that the raw wastewater should be diluted before EC treatment if its COD is higher than about 10,000 mg/L. Pilot scale removal efficiencies of COD and color were slightly lower compared to those obtained from the laboratory scale. At pilot scale, the effluent CODs removal efficiency was 81.9-88.9% (final concentration of 448-992 mg/L) and color removal efficiency was 95.8-98.6% (final level of 89-202 Pt-Co) which proved the feasibility of EC treatment as an effective pre-treatment method for printing wastewater as well as other high colored and hard-biodegradable wastewaters.

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Section: Effect Of Electrode Distancementioning

confidence: 56%

Application of Electrocoagulation for Printing Wastewater Treatment: From Laboratory to Pilot Scale

Thủy

Xuan

Thành

et al. 2021

J. Electrochem. Sci. Technol

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“…Rather than the relatively steady rise with smoother curves observed in Figure 2, the results showed a much-pronounced zigzag pattern, thus implying an intermittent rise and fall in coagulation activity. In support of this observation, Fekete et al [29] reported that "the released metal ions are only active as coagulants briefly after their formation and should therefore be intermixed as fast as possible." In Table 3, a brief overview of recent studies on electrodes other than Al or Fe utilized in the electrocoagulation of microalgae is compared.…”

Section: Flocculation Efficiency (Fe)mentioning

confidence: 91%

Evaluation of Pb, Mg, Al, Zn, and Cu as Electrode Materials in the Electrocoagulation of Microalgae

Phiri

Pak

et al. 2021

Processes

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Apart from the conventionally used iron (Fe) and aluminum (Al) electrodes in microalgae harvesting, experiments were designed to examine the viability of lead (Pb), magnesium (Mg), zinc (Zn), and copper (Cu) as electrode materials in the harvesting of microalgae. The effect of voltage on the flocculation efficiency (FE) of the electrode materials was examined and compared. By dividing the optimal FE values by their corresponding periods, a simple yet practical approach was used to rank the electrode materials. From highest to lowest flocculation efficiency, the results were as follows: Cu, Zn, Mg, Al, and Pb at 10 V; Mg, Zn, Cu, Al, and Pb at 20 V; and Mg, Zn, Al, Cu, and Pb at 30 V. Important factors such as temperature, periodic FE, consumption of electrode material, pH, and metallic concentrations in the effluent were evaluated. The temperature increase proposed to have been affected by electric resistance drop and anodic corrosion, between 1.7 °C and 3.3 °C, 5 °C and 8.9 °C, and 10.5 °C and 18.4 °C was recorded at 10 V, 20 V, and 30 V respectively. Except for the supernatants of the experiments from Al electrodes, which remained relatively unaffected by voltage and time, the pH of all the other supernatants increased with time and voltage. The effluents recorded metallic concentrations between 0.513 mg/L and 43.8 mg/L for Pb, 7.02 mg/L and 20.5 mg/L for Mg, 1.34 mg/L and 9.09 mg/L for Al, 0.079 mg/L and 0.089 mg/L for Zn, and 0.252 mg/L and 0.434 mg/L for Cu electrodes.

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“…In fact, the authors have used different values for the distance between the electrodes. Yilmaz et al [20] worked with 5 mm, Lekhlif et al [29] and Fekete et al [21] used 1 cm, and Fekete et al [21] have tried three values 1, 2, and 3 cm. Khandegar et al have shown that this distance must be sufficiently small for the intensity of the electric field to be sufficient to move the Al 3+ ions produced quickly at the anode towards the solution and large enough to allow sufficient residence of the aluminum hydroxides, so that the flocs are formed [30].…”

Section: Apparatusmentioning

confidence: 99%

Optimization of Physicochemical Parameters during the Electrocoagulation Cadmium Elimination

Aityoub

Abouelfida

Benyaich

et al. 2020

Journal of Chemistry

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The increased use of fertilizers from phosphates in agriculture generates water pollution by heavy metals contained in these phosphates at levels higher than the standards. In our study, we used a cadmium nitrate Cd(NO3)2 solution to simulate artificially polluted water, whose decontamination efficiency will be evaluated by an electrocoagulation/flotation process. During this work, we aimed to optimize the electrocoagulation process according to the following factors: initial pH of the solution, density of the electrolysis current, cell time, and nature of the supporting electrolyte and its concentration. The criteria adopted during the optimization of the process are relatively different from those used in similar studies. Indeed, we have tried to achieve maximum efficiency and also seeking to minimize costs and facilitate implementation. We achieved a 98% Cd removal efficiency from the solution at pH = 7, J = 6.25 A/m2, t = 10 min, and [K2SO4] = 0.01 M. In addition, during the characterization of the flocs obtained as a supernatant, we first highlighted the presence of Cd in this gelatinous body and then the relatively easy volatility of Cd as well as that of aluminum oxide (Al2O3).

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Electrochemical dissolution of aluminium in electrocoagulation experiments

Cited by 35 publications

References 20 publications

Application of Electrocoagulation for Printing Wastewater Treatment: From Laboratory to Pilot Scale

Application of Electrocoagulation for Printing Wastewater Treatment: From Laboratory to Pilot Scale

Evaluation of Pb, Mg, Al, Zn, and Cu as Electrode Materials in the Electrocoagulation of Microalgae

Optimization of Physicochemical Parameters during the Electrocoagulation Cadmium Elimination

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