Aplicação da tecnologia de eletrofloculação na recuperação do corante índigo blue a partir de efluentes industriais

Paschoal, Fabiana M. M.; Tremiliosi‐Filho, Germano

doi:10.1590/s0100-40422005000500006

Cited by 25 publications

(11 citation statements)

References 25 publications

(32 reference statements)

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“…During the dying process, about 5 -20% of the dye are lost due to its partial adsorption on the fibers (Paschoal and Tremiliosi-Filho, 2005). Dyes are manufactured to have high chemical resistance because they are normally chemical species that are very difficult to degrade (aromatic dyes).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, conventional treatment processes have been applied, namely: adsorption, precipitation, chemical degradation, photochemical degradation, biodegradation, flocculation, and so on (Paschoal and Tremiliosi-Filho, 2005). Over the recent years, there has been a growing interest in the development of efficient electrochemical processes for the removal of toxic organic wastewater contaminants.…”

Section: Introductionmentioning

confidence: 99%

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Electroflocculation for textile wastewater treatment

Cerqueira

Russo

Marques

2009

Braz. J. Chem. Eng.

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-This work reports on the viability of the electroflocculation (EF) process for chemical oxygen demand (COD), turbidity and color removal from a raw effluent originated from a particular textile industry related to hemp manufacture. Firstly, the following operational parameters were optimized: current density; initial pH; electrolysis time; material of the electrode (iron, aluminum or iron-aluminum); and interelectrode distance. Additionally, the effects of these parameters on specific electrical energy consumption (SEEC) were studied under the optimum conditions. The best removal efficiencies obtained were 93% for color, 99% for turbidity and up to 87% for COD using an aluminum electrode, the initial pH was 5, the cell time operation was 30 min and current density was 15 A/m 2 . These results indicate that, under the studied operational conditions, electroflocculation of these efluents may constitute a viable alternative for COD, turbidity and color removal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroflocculation for textile wastewater treatment

Cerqueira

Russo

Marques

2009

Braz. J. Chem. Eng.

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“…In agreement with Paschoal and Tremiliosi-Filho (2005), a strong staining is the predominant characteristic in the textile effluent, which is due to the different dyes used in the fabric dyeing stage, and according to Carneiro et al, (2010), the azo chromophore group is the most used, corresponding to 65-70% of all the reactive dyes produced.…”

Section: Introductionmentioning

confidence: 67%

Efficiency of the electrochemical treatment of textile effluent using two configurations of sacrificial electrodes

Fleck

Passos²,

Helmann³

et al. 2018

RHE

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Abstract:Textile industries have as main characteristic the generation of effluents with high color, and efficient treatment techniques are necessary. In this context, this study compared the efficiency of the electrochemical treatment for color removal from synthetic textile effluent using two configurations of sacrificial electrodes, parallel plates and array of cylindrical electrodes. For application of the electroflocculation technique, an electrochemical reactor was used, in a laboratory scale, operated in a continuous flow. The synthetic textile effluent was prepared with preset concentrations of reactive dye Blue 5G and sodium chloride. Sacrificial iron (Fe) electrodes with different configurations were used: parallel plates and cylindrical electrodes. The Hydraulic Retention Time (HRT) and electric current density (j) were controlled, and their effects on color removal were evaluated using a Central Composite Rotational Design (CCRD) composed of 12 trials. For the electrochemical treatment using parallel plates, the color removal efficiency ranged from 56.13% to 98.95% and for the electrochemical treatment using an array of cylindrical electrode, the color removal efficiency varied from 2.11% to 97.84%. The mathematical models representative of the process explained a high proportion of the total data variability, with a coefficient of variation of 99.49% and 97.21% for parallel plates and arrangement of cylindrical electrodes, respectively. The electrochemical treatment using parallel plates presents advantages over the configuration using a cylindrical electrode array, since the color removal efficiency is superior under the same operating conditions, representing economic and environmental gains.Keywords: Dyes. Cylindrical electrodes. Electroflocculation. Mathematical modeling. Parallel plates.Resumo: Indústrias têxteis possuem como principal característica a geração de efluentes com elevada coloração, sendo necessárias técnicas eficientes de tratamento. Neste contexto, o presente artigo tem como objetivo comparar a eficiência do tratamento eletroquímico para a remoção de cor de efluente têxtil sintético utilizando duas configurações de eletrodos de sacrifício, placas paralelas e arranjo de eletrodos cilíndricos. Para a aplicação da técnica de eletrofloculação, utilizou-se um reator eletroquímico, em escala laboratorial, operado em fluxo contínuo. O efluente têxtil sintético foi preparado com concentrações preestabelecidas de corante reativo azul 5G e cloreto de sódio. Utilizou-se eletrodos de sacrifício de ferro (Fe) com diferentes configurações: placas paralelas e eletrodos cilíndricos. Foram controlados os fatores Tempo de Retenção Hidráulica (TRH) e densidade de corrente elétrica (j), sendo seus efeitos sobre a remoção de cor avaliados utilizando-se um delineamento composto central rotacional (DCCR) composto por 12 ensaios. Para o tratamento eletroquímico utilizando placas paralelas a eficiência de remoção da cor variou de 56,13% a 98,95% e para o tratamento eletroquímico utilizando arranjo de ele...

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“…Na superfície, forma-se uma camada de espuma que contém as partículas flotadas que são facilmente removidas (PASCHOAL; FILHO, 2005).…”

Section: Introdução/objetivounclassified