Electrocoagulation flocculation as a low-cost process for pollutants removal from urban wastewater

Azzouzi, M. El; Haboubi, Khadija; Elyoubi, M.S.

doi:10.1016/j.cherd.2016.11.011

Cited by 114 publications

(50 citation statements)

References 59 publications

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“…Many works have reported the capacity of iron precipitates to remove a wide variety of ions mainly by adsorption on the growing flocs. 11,18,[37][38][39] In the case of chemical dosing-neutralization, an increase in the relative conductivity of the effluent was observed for all the effluents tested except for the tap water. In these cases, the addition of ions in the form of FeCl 3 and sodium hydroxide (in the neutralization stage) overcomes the flocs ability to adsorb the ions present in the solution.…”

Section: Resultsmentioning

confidence: 97%

“…Observations suggest that the electrochemical dosing of iron provokes a slight decrease in the conductivity, being the decline observed in the conductivity higher for lower initial conductivity. Many works have reported the capacity of iron precipitates to remove a wide variety of ions mainly by adsorption on the growing flocs . In the case of chemical dosing‐neutralization, an increase in the relative conductivity of the effluent was observed for all the effluents tested except for the tap water.…”

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…Electrocoagulation is an electrochemical technology that is currently gaining scientific and industrial interest due to the wide range of applications in which this process has been proven efficient. It has been successfully applied in the treatment of drinking water, 1-4 different types of industrial wastewater, 5-9 urban wastewater [10][11][12] and reclaimed wastewater. [13][14][15] Electrocoagulation is reported to exhibit clear advantages versus conventional chemical coagulation, 16,17 specifically lower chemical dosing requirements, limited increase (or even decrease) in the ionic conductivity, 18 better pH control 19 and lower operational costs.…”

Section: Introductionmentioning

confidence: 99%

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Development of a novel electrochemical coagulant dosing unit for water treatment

Llanos

Isidro

Sáez

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND The design of new approaches that help to decrease both the environmental impact of industrial activities and the cost of existing water treatment technologies is becoming a key aspect of research. In the present work, an efficient and easy‐to‐use electrochemical device designed to dose iron coagulants is presented. RESULTS The proposed device (the Electrochemically‐assisted Coagulant – production & dosing Unit, ECU) exhibits an efficient performance in the dosing of coagulants regardless of the ionic conductivity of the water matrixes tested (within the range 100 to 1000 µS cm−1), covering a wide range of potential real surface waters. The behaviour of the ECU device was compared to that of a conventional chemical dosing of iron, and showed better pH (pH ≈ 8 for ECU but < 4 for equivalent chemical dosing) and conductivity (decrease for ECU but increase up to 60% for equivalent chemical dosing) control. Moreover, the ECU unit produced a noticeable amount of Fe2+ ions, due to the limited access of atmospheric oxygen inside the device. CONLUSION The device developed overcomes traditional chemical iron dosing and could be potentially applied in uses different from electrocoagulation, as it is the case of Fenton‐related technologies. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of a novel electrochemical coagulant dosing unit for water treatment

Llanos

Isidro

Sáez

et al. 2018

J of Chemical Tech & Biotech

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“…Tratamentos prévios ou posteriores, de naturezas distintas, são integrados para se aumentar a eficiência global do sistema, reduzir a área de instalação e os custos, ou transformar quimicamente os poluentes em substâncias biologicamente degradáveis ou mais facilmente elimináveis pelos processos convencionais [7]. Uma das alternativas são os processos eletroquímicos, que tem demonstrado potencial de aplicação para o tratamento de esgotos, devido a possibilidade de serem eficazes na remoção de contaminantes (como nutrientes, compostos orgânicos, patógenos e micropoluentes [8]), além de apresentarem vantagens como fácil operação, pequeno espaço físico requerido, baixos custos e geração de baixas quantidades de lodo [9], [10], [11], [12].…”

Section: Introductionunclassified

Análise do desempenho de um sistema eletroquímico no tratamento de esgoto doméstico

Brächer¹,

Glusczak²,

Lovato³

et al. 2018

SCI

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ResumoPara prevenir a degradação da qualidade de corpos hídricos, o lançamento de esgotos domésticos tem padrões limitados por legislação vigente, ficando condicionado a realização de um tratamento prévio. Dentre as alternativas de tratamento, a eletrocoagulação-flotação, processo eletroquímico que combina os mecanismos de oxidação, coagulação, floculação e flotação, têm se demonstrado capaz de promover um tratamento adequado para águas residuárias, além de apresentar aspectos positivos nas perspectivas operacional, econômica e sustentável. O objetivo deste estudo foi avaliar o desempenho de um sistema de tratamento de esgoto doméstico composto por um reator de eletrocoagulação-flotação. O estudo foi realizado em um reator cilíndrico, com 1 L de capacidade, equipado com um par eletrodos de alumínio, conectados a uma fonte de alimentação de corrente contínua. As condições experimentais de distância entre os eletrodos, corrente elétrica, tempo de eletrólise e agitação foram de 1 cm, 1,5 A, 20 min e 262,5 rpm, respectivamente. O desempenho do sistema foi verificado através da análise de parâmetros físico-químicos do esgoto antes e após o tratamento. Com base nos resultados obtidos, foi possível concluir que o sistema de eletrocoagulação-flotação apresentou um desempenho satisfatório no tratamento de esgoto doméstico, sendo verificadas eficiências de remoção médias de 78,9% de demanda química de oxigênio, 97,3% de cor aparente e 90,1% de turbidez. A qualidade do esgoto, verificada após o tratamento no sistema, esteve em conformidade com a legislação vigente de despejo em corpos hídricos receptores, com exceção do pH, que se manteve na faixa de 9,1, indicando a necessidade de uma etapa adicional de correção de pH ao tratamento. Palavras-chaveEletrocoagulação-flotação, eletrodos de alumínio, esgoto doméstico.Analisys of the performance of an electrochemical system for the domestic wastewater treatment AbstractIn order to prevent the degradation of the water bodies quality, the domestic wastewater discharge has standards limited by prevailing legislation, which is conditioned by accomplishment of a previous treatment. Among the treatment alternatives, the electrocoagulationflotation, an electrochemical process that combines the mechanisms of oxidation, coagulation, flocculation and flotation, has been shown capable to promote an adequate treatment for wastewater, showing positive aspects in the operational, economic and sustainable perspectives. The objective of this study was to evaluate the performance of a domestic wastewater treatment system composed of an electrocoagulationflotation reactor. The study was carried out in a cylindrical reactor, with 1 L of capacity, equipped with a pair of aluminum electrodes, connected to a direct-current power supply. The experimental conditions of distance between the electrodes, electrical current, electrolysis time and agitation were 1 cm, 1.5 A, 20 min and 262.5 rpm, respectively. The performance of the system was verified through the analysis of physical and chemical parameter...

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Biofunctionalized Nanomaterials a Zero Waste Approach for the Remediation of Pollutants

Kumar,

Kumar

et al. 2024

Zero Waste Management Technologies

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Electrocoagulation flocculation as a low-cost process for pollutants removal from urban wastewater

Cited by 114 publications

References 59 publications

Development of a novel electrochemical coagulant dosing unit for water treatment

Development of a novel electrochemical coagulant dosing unit for water treatment

Análise do desempenho de um sistema eletroquímico no tratamento de esgoto doméstico

Biofunctionalized Nanomaterials a Zero Waste Approach for the Remediation of Pollutants

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