Behavior of aluminum electrodes in electrocoagulation process

Mouedhen, G.; Feki, M.; Wery, M. De Petris; Ayedi, H.F.

doi:10.1016/j.jhazmat.2007.04.090

Cited by 429 publications

(278 citation statements)

References 49 publications

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“…However, it has been observed in corrosion studies decades ago [16,17,18,19] that Al is dissolved not only anodically but also under cathodic conditions. Dissolution of the Al cathode in the context of electrocoagulation have also been studied [14,20,21]. These measurements -based on hydrogen/aluminium ratio determinations -are suitable to prove that both electrodes are dissolved; however, they cannot provide dissolution rates separately.…”

Section: Experiments B1: How Much Al Is Dissolved In An Al-al Cell?mentioning

confidence: 99%

“…Note that the excess Al disappearing from the electrode in the form of grains does not contribute to coagulation. The weight loss of the Al cathodes has already observed and identified as being due to the chemical dissolution of Al in the locally alkaline solution close to the cathode [14,20,21]. For the necessary conditions of the cathodic dissolution experiments are presented in the next section.…”

Section: Experiments B1: How Much Al Is Dissolved In An Al-al Cell?mentioning

confidence: 99%

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Electrochemical dissolution of aluminium in electrocoagulation experiments

Fekete

Lengyel

Cserfalvi

et al. 2016

J Solid State Electrochem

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Six experiments are presented to highlight important features of aluminium dissolution when used in electrocoagulation procedure employed to remove oily contaminations from water. First, using a common oil-in-water emulsion: diluted milk, we show that the electrochemically generated coagulant ions are active only in the first few seconds following their generation -hence the electrocoagulation cells' construction should promote the mixing of the nascent Al colloid with the water phase. For this reason the use of the narrow-gap cells is suggested. Second, in experiments with Al-Al electrode pairs and dilute, neutral, unbuffered, aqueous solutions we (i) estimate the maximum amount of Al dissolution on the cathode, and (ii) show how the rate of Al dissolution changes with frequency if the cell voltage polarity is alternating.

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Section: Experiments B1: How Much Al Is Dissolved In An Al-al Cell?mentioning

confidence: 99%

Section: Experiments B1: How Much Al Is Dissolved In An Al-al Cell?mentioning

confidence: 99%

Electrochemical dissolution of aluminium in electrocoagulation experiments

Fekete

Lengyel

Cserfalvi

et al. 2016

J Solid State Electrochem

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“…Then, they are floated by electro-generated hydrogen or oxygen (typically hydrogen) bubbles towards the surface of the ECF cell. In ECF, numerous electrochemical reactions occur being summarized as follows (Mouedhen et al 2008;Chen 2004):…”

mentioning

confidence: 99%

Electrocoagulation/Flotation of Textile Wastewater with Simultaneous Application of Aluminum and Iron as Anode

et al. 2014

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Wastewater discharged from textile industry contains a variety of polluting substances including dyes. Amongst treatment processes, electrocoagulation/flotation is a promising method for color removal from textile wastewater. In this study, the performance of a new electrocoagulation/flotation with combined Fe-Al anodes and a copper made cell as cathode was investigated for the treatment of real textile wastewater. The optimal operational condition for decolorization was pH=7, 300 mA electrical current, 3 cm distance between the two anodes and 40 min reaction time using iron and aluminum as anode materials simultaneously. Under this condition, 98 % color (ADMI) removal was achieved. Furthermore, 87 % COD removal was obtained in similar optimal condition except in 400 mA. To investigate electrical current dependency on the COD removal rate, a kinetic study was carried out and data were in good agreement with the first order kinetic model. The rate constants (k) of COD removal were 0.0234, 0.0291, 0.0393 and 0.0519 min −1 for 100, 200, 300 and 400 mA, respectively.

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“…In the electrocoagulation unit, the main structure of electrocoagulation unit is a cabin with Aluminum plates. Under the effect of the current, Aluminum plates dissolved and change into aluminum ion, the aluminum ion hydrolyzes and generates flocculants, which can act on impurities and form precipitates(equation (1) - (6)) [4]- [9]. The suspended solids, insoluble organic matter and part of the oil can be absorbed by the flocculants and precipitated to the bottom of the electrocoagulation unit.…”

Section: Experimental Methodsmentioning

confidence: 99%