Electrocoagulation process applied to wastewater containing dyes from textile industry

Aoudj, S.; Khelifa, A.; Drouiche, Nadjib; Hecini, M.; Hamitouche, Houria

doi:10.1016/j.cep.2010.08.019

Cited by 234 publications

(99 citation statements)

References 30 publications

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“…EC technique uses a direct current source between metal electrodes such as aluminium and iron immersed in water effluent to cause the dissolution of metal plates into wastewater [74]. The metal ions form coagulated for particulates flocculating which cause metal hydroxides to precipitate and chemically adsorb dissolved contaminants [75].…”

Section: Electrokinetic Coagulationmentioning

confidence: 99%

“…The metal ions form coagulated for particulates flocculating which cause metal hydroxides to precipitate and chemically adsorb dissolved contaminants [75]. EC process provides a simple, reliable and low cost method for the removal of dyes such as direct red (81) from wastewater [74], reactive blue 140 [76] and disperse red [77]. The main advantages of electro coagulation in compare to other conventional technique such as chemical coagulation are the compact of equipment used and no generation of secondary pollution [76].The disadvantages associated with this process are the need for further treatment by flocculation and filtration and high amount of sludge produced.…”

Section: Electrokinetic Coagulationmentioning

confidence: 99%

See 1 more Smart Citation

Review on Dye Removal from Its Aqueous Solution into Alternative Cost Effective and Non-Conventional Adsorbents

Dawood¹,

Sen

2013

Journal of Chemical and Process Engineering

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Dyes are complex organic compounds which are used by various industries to colour their products. These dyes are purged from various industrial sources such as textile, cosmetic, paper, leather, rubber and printing industries. Wastewater effluents contain dyes which may cause potential hazards to the environment. Some of these dyes are toxic, carcinogenic and can cause skin and eye irritation. Therefore, many researchers have been studied the effectiveness of dyes removal from aqueous solution by different separation methods. Different separation techniques have been used for the treatment of dye-bearing wastewater such as adsorption, coagulation/flocculation, advanced oxidation technologies, ozonation, and membrane-filtration, aerobic and anaerobic degradation. All dye separation techniques have their own limitation in terms of design, operation efficiency and total cost. This review paper provides extensive literature information about dyes, its classification and toxicity together with various treatment methods into dye adsorption characteristics of several non-conventional cost effective sustainable adsorbents. The mechanism and the effects of various physio-chemical process parameters on dye adsorption are presented here.

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Section: Electrokinetic Coagulationmentioning

confidence: 99%

Section: Electrokinetic Coagulationmentioning

confidence: 99%

Review on Dye Removal from Its Aqueous Solution into Alternative Cost Effective and Non-Conventional Adsorbents

Dawood¹,

Sen

2013

Journal of Chemical and Process Engineering

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“…Contemporarily, the most common methods of textile wastewater treatment include: adsorption (Mahmoodi, 2011), biosorption (Somasekhara Reddy et al, 2012), coagulation/flocculation (Man et al, 2012), ozonation (van Leeuwen et al, 2009), membrane filtration (Molinari et al, 2004), electrocoagulation (Aoudj et al, 2010) and photocatalytic removal (Gondal et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Fìl

Yılmaz

Bayar

et al. 2014

Braz. J. Chem. Eng.

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-In this study, color removal by absorption from synthetically prepared wastewater was investigated using montmorillonite clay by adsorption. As dyestuff Astrazon Red Violet 3RN (Basic Violet 16) was used. Experimental parameters selected were pH, temperature, agitation speed, initial dyestuff concentration, adsorbent dosage and ionic strength. It was established that adsorption rate increased with increasing pH, temperature, dye concentration and agitation speed, but decreased with increased ionic strength and adsorbent dosage. Adsorption equilibrium data obtained by a series of experiments carried out in a water bath were employed with common isotherm equations such as Langmuir, Freundlich, Temkin, Elovich and Dubinin-Radushkevich. It was found that the Langmuir equation appears to fit the equilibrium data better than the other models. Furthermore, the fit of the kinetic data to common kinetic models such as the pseudofirst-order, second-order, Elovich and intraparticle diffusion models was tested to elucidate the adsorption mechanism. Kinetic data conformed to the pseudo-second-order model, indicating chemisorptions. In addition, the thermodynamic parameters activation energy, Ea, enthalpy ΔH*, entropy, ΔS*, and free energy change, ΔG*, were calculated. The values of the calculated parameters indicated that physical adsorption of ARV on the clay was dominant and that the adsorption process was endothermic.

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“…Electrochemical method is preferred, because of the advantages such as 1) environmentally-friendly technology, 2) high effectiveness process, 3) no addition of chemical requirements, 4) small occupied area, 5) generating small volume of sludge, 6) simplicity of the operation and maintenance, and 7) relatively low investment cost (12,13). Electrocoagulation is an efficient, credible and low-cost method for treating a large variety of wastewater bodies such as industrial wastewater, municipal wastewater, chemical oxygen demand (COD ) removal, dyes, oil-water emulsions, and heavy metal-containing solutions (14,15).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini

Rezaee

2014

Health Scope

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Background:The presence of nitrate and its intermediates are considered undesirable compounds in the environment. Various methods have been proposed to remove nitrate from wastewater and water streams. Objectives: In this study, we investigated removal of nitrate from an aqueous solution by the process of electrocoagulation, using aluminum/graphite as the anode/cathode electrodes. Materials and Methods:We applied response surface methodology (RSM) as the statistical method for modeling, and optimizing the applied variables. All experiments were performed according to the standard methods for the examination of water and wastewater. To prepare the optimum condition, we considered the following amount of compounds and conditions: NaCl, 1 g/L; nitrate concentration range, 50-200 mg/L; applied electric current range, 0.05-0.2 A; anode, aluminum; cathode, graphite; and detention time: 120 minutes. Results:The results showed that by applying electric current of 0.14 A for 120 minutes, the nitrate content would reduce down to 97%. The obtained R 2 for the nitrate removal model was higher than 0.99. With regard to supporting electrolytes, more nitrate reduction is obtained with NaCl. The oxidation reduction potential (ORP) was changed from 220 to -375 mV and this range is suitable for denitrification and nitrate reduction. Conclusions:The results of this study show that it is possible to remove nitrate, and its intermediates from waste water. Regarding the desirability of the process, the field scale study is proposed.

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Electrocoagulation process applied to wastewater containing dyes from textile industry

Cited by 234 publications

References 30 publications

Review on Dye Removal from Its Aqueous Solution into Alternative Cost Effective and Non-Conventional Adsorbents

Review on Dye Removal from Its Aqueous Solution into Alternative Cost Effective and Non-Conventional Adsorbents

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

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