Decolourisation of real textile waste using electrochemical techniques: Effect of electrode composition

Malpass, Geoffroy Roger Pointer; Miwa, Douglas Waychi; Machado, Sérgio Antônio Spínola; Motheo, Artur J.

doi:10.1016/j.jhazmat.2007.12.017

Cited by 67 publications

(38 citation statements)

References 23 publications

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“…21 However, the E EO values at 2.2 V are much greater than at 1.8 V, due to the greater applied potential and competition between O 2 and Cl 2 formation at the higher potential. It should be noted that the E EO values presented in Table 1 are much lower than those previously obtained in this laboratory for real textile effluent, 21,40 indicating the complex nature of the treatment required when change is made from simulated to real effluents. , without membrane.…”

Section: Influence Of Nacl Concentration and Applied Potentialmentioning

confidence: 55%

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Gomes¹,

Miwa²,

Malpass³

et al. 2011

J. Braz. Chem. Soc.

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As remoções eletroquímicas de cor e do conteúdo orgânico de soluções do corante laranja reativo 16 (RO16) foram efetuadas usando uma célula em fluxo e um eletrodo de trabalho de Pt. As influências das variáveis do sistema, tais como fluxo, concentração de NaCl, potencial aplicado e pH da solução, foram estudadas. A melhor remoção de cor foi de 93% (l = 493 nm) após 60 min de eletrólise potentiostática a 2,2 V vs. ERH, usando 1,00 g L -1 NaCl como eletrólito suporte. Os aumentos na concentração de NaCl e do potencial aumentam a velocidade de remoção de cor. A melhor remoção de carbono orgânico total (57%) foi obtida com a aplicação de 1,8 V, sem membrana de separação, indicando que as melhores condições para remoção de cor não são necessariamente as melhores para remover conteúdo orgânico. A eficiência de degradação diminui com a diminuição do pH da solução.Electrochemical removals of color and organic load from solutions containing the dye reactive orange 16 (RO16) were performed in an electrochemical flow-cell, using a platinum working electrode. The influence of the process variables flow-rate, such as NaCl concentration, applied potential and solution pH, were studied. The best color removal achieved was 93% (l = 493 nm) after 60 min at 2.2 V vs. RHE electrolysis, using 1.00 g L -1 NaCl as supporting electrolyte. The rises in the concentration of NaCl and applied potential increased the color removal rate. The best total organic carbon removal (57%) was obtained at 1.8 V, without the separating membrane, indicating that the ideal conditions for the color removal are not necessarily the same as those to remove the total organic carbon. The degradation efficiency decreased with the solution pH decrease.Keywords: decolorization, textile effluent, electrochemical degradation, reactive dye, Pt electrode IntroductionWhen untreated textile effluents are discharged into receiving water bodies many environmental problems can occur. The principal problems are that the presence of dyes (even at concentrations of < 1 ppm) that can cause considerable coloration in water courses, affect transparency to natural light (reducing photosynthesis), reduce gas solubility and may also present carcinogenic and mutagenic properties. 1,2Wide varieties of dyes are used in the textile industry and can be classified according to the manner in which they are fixed to the textile fiber (e.g., direct, reactive) or by their chemical structure (e.g., azo, anthraquinone). In the textile industry, reactive dyes are widely used due to their relatively easy application in the dyeing process and stability during wear. As a result of this stability, reactive dyes may require more complicated systems to achieve their removal from effluent flows. A number of methods presented in the literature are traditionally used to treat textile effluent and they are generally based on physical, chemical and biological treatments.3-5 Physical treatment methods tend to simply transfer the pollutant to a different phase and biological methods can be prolonged and ...

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Section: Influence Of Nacl Concentration and Applied Potentialmentioning

confidence: 55%

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Gomes¹,

Miwa²,

Malpass³

et al. 2011

J. Braz. Chem. Soc.

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“…In this work, Ti/Pt, DSA-Cl 2 and DSA-O 2 anodes were selected to be evaluated due to both, i) their relatively moderate cost and reliability at industrial scale and ii) they have been commonly used for wastewater treatment [41][42][43][44]. Each electrode needs some experimental conditions recommended by the manufacturer, for example, for DSA-Cl 2 pH has to be between 9 and 11 and the maximum chloride concentration should be 5000 mg L -1 .…”

Section: Influence Of Anode Materialsmentioning

confidence: 99%

Electrochemical treatment of wastewater from almond industry using DSA-type anodes: Direct connection to a PV generator

Valero

García-García

Expósito

et al. 2014

Separation and Purification Technology

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Please cite this article as: D. Valero, V. García-García, E. Expósito, A. Aldaz, V. Montiel, Electrochemical treatment of wastewater from almond industry using dsa-type anodes: direct connection to a pv generator, Separation and Purification Technology (2013), doi: http://dx.doi.org/10.1016/j.seppur. 2013.12.023 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ELECTROCHEMICAL TREATMENT OF WASTEWATER FROM ALMOND INDUSTRY USING DSA-TYPE ANODES: DIRECT CONNECTION TO A PV GENERATOR ABSTRACTFood industries such as almond industry generate large volumes of wastewater in their processes and common techniques are not always efficient for treating this kind of effluents. In this work, the feasibility of a treatment for pollutants removal of a real industrial wastewater by electrochemical oxidation s studied at laboratory scale and then scaled-up to pre-industrial scale. The first stage of the work was performed at laboratory scale, using a 63 cm 2 cell, where different anodes (Ti/Pt, and DSA anodes (Ti/RuO 2 and Ti/IrO 2 )) and the optimal experimental conditions (pH, current density, temperature and In the second stage the scaling-up of the process from laboratory to pre-industrial scale was performed, by using a 3300cm 2 cell. The electrochemical reactor was finally powered by a photovoltaic generator directly connected, in order to operate by using a renewable energy and a COD elimination of 80 % was achieved.

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“…Specific electrical energy consumption is the amount of electrical energy consumed per unit mass of organic load and was calculated in terms of various measurements as given below where the removal rate is first order with respect to the substance [C] of interest, the E EO is given by (Hazira Khan, 2010, Malpass, 2008,…”

Section: Electrical Parametersmentioning

confidence: 99%

Electrochemical Degradation of Remazol Red Rb 133 Using Sacrificial Electrodes

Rekha

Murthy

2018

mijst

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Decolourisation of real textile waste using electrochemical techniques: Effect of electrode composition

Cited by 67 publications

References 23 publications

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Electrochemical treatment of wastewater from almond industry using DSA-type anodes: Direct connection to a PV generator

Electrochemical Degradation of Remazol Red Rb 133 Using Sacrificial Electrodes

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