Arsenic removal by electrocoagulation using combined Al–Fe electrode system and characterization of products

Gomes, Jewel A.; Daida, Praveen; Kesmez, Mehmet; Weir, Michael D.; Moreno, Héctor; Parga, José R.; Irwin, George M.; McWhinney, Hylton; Grady, Tony L.; Peterson, Eric; Cocke, David L.

doi:10.1016/j.jhazmat.2005.11.108

Cited by 361 publications

(208 citation statements)

References 45 publications

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“…We have also observed an amorphous sediment in the anode compartment that could be due to the formation of amorphous Fe(OH) 3 and/or HFO which is composed of mainly Fe but also of other compounds such as Cu, Mg, Ca, K, and Na that could be products of co-precipitation or adsorption. Other researches have shown that compounds such as Se, Ni, and As could be adsorbed by these hydroxides/polyhydroxides/polyhydroxyoxide metallic compounds [27][28][29]. Overall, our experiments indicate that nutrient recuperation was achieved, although the co-precipitation and adsorption mechanisms were not completely clear.…”

Section: Discussionmentioning

confidence: 46%

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Zamalloa¹,

Arends²,

Boon³

et al. 2013

New Biotechnology

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Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water. New Biotechnology 30 (5) 573-580 doi:10.1016/j.nbt.2013.01.009 Title: Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water. AbstractSeptic tanks are used for the removal of organic particulates in wastewaters by physical accumulation instead of through the biological production of biogas. Improved biogas production in septic tanks is crucial to increase the potential of this system for both energy generation and organic matter removal. In this study, the effect on the biogas production and biogas quality of coupling a 20 L lab-scale septic tank with a microbial electrolysis cell (MEC) was investigated and compared with a standard septic tank. Both reactors were operated at a volumetric organic loading rate of 0.5 gCOD/L d and a hydraulic retention time between 20 and 40 days using black water as an input under mesophilic conditions for a period of 3 months. The MEC-septic tank was operated at an applied voltage of 2.0 ±0.1V and the current experienced ranged from 40 mA (0.9 A/m 2 projected electrode area) to 180 mA (5 A/m 2 projected electrode area). The COD removal was of the order of 85% and the concentration of residual COD was not different between both reactors. Yet, the total phosphorous in the output was on average 39% lower in the MEC-septic tank. Moreover, the biogas production rate in the MEC-septic tank was a factor of 5 higher than in the control reactor and the H 2 S concentration in the biogas was a factor of 2.5 lower. The extra electricity supplied to the MECseptic tank was recovered as extra biogas produced. Overall, it appears that the combination of MEC and a septic tank offers perspectives in terms of lower discharge of phosphorus and H 2 S, nutrient recuperation and a more reliable supply of biogas.

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Section: Discussionmentioning

confidence: 46%

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Zamalloa¹,

Arends²,

Boon³

et al. 2013

New Biotechnology

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“…These include, electrode material (Bagga et al, 2008;Gomes et al, 2007;Chou et al, 2009) inter-electrode spacing (Dalvand et al, 2011), current density (Arslan-Alaton et al, 2008), initial concentration/dose (Mouedhen et al, 2008;Mkpenie et al, 2014), initial pH (Sasson et al, 2009;Irdemez et al, 2006), supporting electrolyte (Trompette and Vergnes, 2009), electrolysis/treatment time (Giwa et al, 2012;Avsar et al, 2012) and temperature (Katal and Pahlavanzadeh, 2011;Vasudevan et al, 2009a;Yilmaz et al, 2008a).…”

Section: Introductionmentioning

confidence: 99%

Electrocoagulation of Azo-2-Naphthol Dye Using Aluminium Electrodes: Effect of Solvent and Kinetics of Adsorption

Mkpenie¹,

Abakedi²

2015

Current Research in Chemistry

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ABSTRACT1-Phenylazo-2-naphthol (PAN) was subjected to electrocoagulation using a 0.3 A d.c electrolytic cell in various solvents including ethanol, acetone, benzene and n-hexane. The extent of decolourization of PAN in the solvents has been determined. The highest decolourization was achieved in ethanol with colour removal efficiency of 63% within the first 15 min and 79% after 120 min of electrocoagulation. The decolourization of PAN in the solvents is observed to follow the order: Ethanol>n-hexane>benzene>acetone. The electrocoagulation data has also been interpreted based on adsorption kinetic models. Electrocoagulation of PAN in all the solvents obeyed the pseudo-second order kinetic model and Elovich kinetic model.

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“…Removal of arsenic by EC process was also reported [19][20][21][22]. Gomes et al adopted combination electrodes such as aluminum and iron in a single electrochemical cell to remove arsenate by an electro-coagulation method.…”

Section: Introductionmentioning

confidence: 99%

“…Gomes et al adopted combination electrodes such as aluminum and iron in a single electrochemical cell to remove arsenate by an electro-coagulation method. The results indicated that arsenate can be partly oxidized into arsenite [21]. Kumar et al conducted laboratory scale experiments with three electrode materials of iron, aluminum, and titanium to assess their efficiency for arsenite and arsenate removal from water.…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenite by simultaneous electro-oxidation and electro-coagulation process

Zhao

Zhang

Liu

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tAn electrochemical reactor was built and used to remove arsenite from water. In this reactor, arsenite can be oxidized into arsenate, which was removed by electro-coagulation process simultaneously. The reactor mainly included dimension stable anode (DSA) and iron plate electrode. Oxidation of arsenite will occur at the DSA electrode in the electrochemical process. Meantime, the iron ions can be generated by the electro-induced process and iron oxides will form. Thus, the arsenic was removed by coagulation process. Influencing factors on the removal of arsenite were investigated. It is found that Ca 2+ and Mg 2+ ions promoted the removal of arsenite. However, Cl − , CO 3 2− , SiO 3 2− , and PO 4 3− ions inhibited the arsenic removal. And, it is observed that the inhibition effect was the largest in the presence of PO 4 3− . Furthermore, it is observed that the removal efficiency of arsenate is the largest in the pH value of 8. Increase or decrease of pH value did not benefit to the arsenite removal. Fourier transform infrared spectra were used to analyze the floc particles, it is suggested that the removal mechanism of As(III) in this system seems to be oxidative of As(III) to As(V) and to be removed by adsorption/complexation with metal hydroxides generated in the process.

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Arsenic removal by electrocoagulation using combined Al–Fe electrode system and characterization of products

Cited by 361 publications

References 45 publications

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Performance of a lab-scale bio-electrochemical assisted septic tank for the anaerobic treatment of black water

Electrocoagulation of Azo-2-Naphthol Dye Using Aluminium Electrodes: Effect of Solvent and Kinetics of Adsorption

Removal of arsenite by simultaneous electro-oxidation and electro-coagulation process

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