Review of pollutants removed by electrocoagulation and electrocoagulation/flotation processes

Emamjomeh, Mohammad Mahdi; Sivakumar, Muttucumaru

doi:10.1016/j.jenvman.2008.12.011

Cited by 586 publications

(279 citation statements)

References 81 publications

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“…From several decades various methods have been evolved in wastewater treatment such as electrochemical treatment methods [12][13][14], oxidation [15], and ozonation [16]. However, the adsorption process has been proven as a most effective and reliable method for dye removal.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Mittal

Malviya

et al. 2009

Journal of Colloid and Interface Science

654

210

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a b s t r a c tThe present investigation assesses the applicability of waste materials-bottom ash and deoiled soya-for the removal of the colorant Congo red from wastewaters. The adsorption characteristics and dye removal efficiency of adsorbents have been determined by investigating factors such as effect of pH, effect of concentration of the dye, amount of adsorbents, contact time, and temperature. Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich isotherm models have been used to evaluate the ongoing adsorption. With the help of adsorption isotherm data different thermodynamic parameters such as free energy; enthalpy, and entropy have been calculated. The estimated free energy has been obtained as À21.52 kJ mol À1 for bottom ash and À16.88 kJ mol À1 for deoiled soya. On the basis of pseudo-first-order and pseudo-second-order kinetic equations different kinetic parameters have been obtained. Column operations depicted good adsorptive tendencies for Congo red with 96.95% and 97.14% saturation of dye on bottom ash and deoiled soya, respectively. Regeneration of the saturated columns has been made by eluting NaOH solution and more than 90% dye has been recovered in both cases.

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Section: Introductionmentioning

confidence: 99%

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Mittal

Malviya

et al. 2009

Journal of Colloid and Interface Science

654

210

View full text Add to dashboard Cite

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“…Electrocoagulation/flotation (ECF) involves the generation of coagulant in situ by the dissolution of metal ions from the consumable anode with simultaneous formation of hydroxide ions at the cathode (Bayramoglu et al 2004;Emamjomeh and Sivakumar 2009). In ECF, pollutants are impinged up towards the surface of the ECF cell by tiny bubbles of hydrogen gas generated from the cathode (Emamjomeh and Sivakumar 2009;Chen 2004). Therefore, instead of using chemicals and microorganisms, electrons are the only employed agents in ECF being responsible for facilitating wastewater treatment (Mollah et al 2004).…”

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confidence: 99%

“…According to the reactions (1-4), the electro-generated metal ions (M n+ ) immediately undergo further spontaneous reactions producing corresponding hydroxides and polyhydroxides having strong affinity for dispersed particles as well as counter ions bringing about the coagulation (Emamjomeh and Sivakumar 2009;Mollah et al 2004). Besides, the gases evolved at the electrodes separate particles and coagulant aggregates by lifting them up through a flotation-like process while accelerating collisions between particles and coagulant by inducing more mixing (Merzouk et al 2011).…”

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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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“…Essa tecnologia possibilita ampliar a capacidade de tratamento dos sistemas tradicionais, visto que utiliza os mesmos fundamentos básicos de coagulação e floculação, porém adicionalmente disponibiliza elementos que potencializam o tratamento, pois há geração de hidrogênio nas reações de eletrólise,que forma um fluxo ascendente de microbolhas que interagem com todo o efluente (MOLLAH et al, 2004;EMAMJOMEH;SIVAKUMAR, 2009). …”

Section: Introductionunclassified

Avaliação Do Custo De Energia Elétrica E De Material No Tratamento De Efluente De Laticínios Por Eletrocoagulação

Valente

Mendonça

Pereira

2015

RBTA

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Resumo Neste trabalho foi avaliado o efeito das variáveis operacionais da eletrocoagulação, pH inicial do IntroduçãoA tecnologia de tratamento de efluente líquido usando eletrólise, também denominada eletrocoagulação (EC), é uma alternativa promissora devido a eficiência de remoção de substâncias em efluentes industriais. Essa tecnologia possibilita ampliar a capacidade de tratamento dos sistemas tradicionais, visto que utiliza os mesmos fundamentos básicos de coagulação e floculação, porém adicionalmente disponibiliza elementos que potencializam o tratamento, pois há geração de hidrogênio nas reações de eletrólise,que forma um fluxo ascendente de microbolhas que interagem com todo o efluente (MOLLAH et al, 2004;EMAMJOMEH;SIVAKUMAR, 2009).

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Review of pollutants removed by electrocoagulation and electrocoagulation/flotation processes

Cited by 586 publications

References 81 publications

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

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

Avaliação Do Custo De Energia Elétrica E De Material No Tratamento De Efluente De Laticínios Por Eletrocoagulação

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