Electrocoagulation of Congo Red dye-containing wastewater: Optimization of operational parameters and process mechanism

Akhtar, Adnan; Aslam, Zaheer; Asghar, Anam; Bello, Mustapha Mohammed; Raman, Abdul Aziz Abdul

doi:10.1016/j.jece.2020.104055

Cited by 79 publications

(27 citation statements)

References 59 publications

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“…Synthesizing of new, efficient, nature-based, or waste-originating adsorbents, kinetic, equilibrium and thermodynamic studies on biosorption [42][43][44][45][46] Coagulation/flocculation Synthesizing of new, efficient, nature-based, or waste-originating coagulants and acceleration of sedimentation by magnetic field [47][48][49][50][51][52] Electro-coagulation Ultra-sound assistance, nanofilms on cathodes and solar power usage [53][54][55][56][57][58] Electrochemical oxidation Air-diffusion cathodes, new materials and coatings of electrodes, membrane anode and electro-peroxone process [59][60][61][62][63][64] Membrane filtration Novel membrane materials, with addition of graphene, stabilization of membranes by biomacromolecules [65][66][67][68][69][70] Ozonation Catalyst addition, enhancement by ultrasound and hydrodynamic cavitation [71][72][73][74][75] O 3 /UV Photocatalytic membranes [76] O 3 /H 2 O 2 Proposal of the degradation mechanism, enhancement by electrolysis, heterogenous catalyst addition [77][78][79] UV/H 2 O 2…”

Section: Adsorptionmentioning

confidence: 99%

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

2021

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In the last 3 years alone, over 10,000 publications have appeared on the topic of dye removal, including over 300 reviews. Thus, the topic is very relevant, although there are few articles on the practical applications on an industrial scale of the results obtained in research laboratories. Therefore, in this review, we focus on advanced oxidation methods integrated with biological methods, widely recognized as highly efficient treatments for recalcitrant wastewater, that have the best chance of industrial application. It is extremely important to know all the phenomena and mechanisms that occur during the process of removing dyestuffs and the products of their degradation from wastewater to prevent their penetration into drinking water sources. Therefore, particular attention is paid to understanding the mechanisms of both chemical and biological degradation of dyes, and the kinetics of these processes, which are important from a design point of view, as well as the performance and implementation of these operations on a larger scale.

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Section: Adsorptionmentioning

confidence: 99%

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

2021

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“…This is because, at high current intensity, the coagulant production increases, and pollutant entrapment takes place [45][46][47]. Likewise, using iron anodes, we can have coagulant species of Fe(OH) 3 , Fe(OH) 2+ , Fe(OH) 2 + , and Fe 2 (OH) 2 4+ [30]. On the other hand, optimization was to minimize energy consumption (I) and operating time (ET), assigning an importance of 3 out of 5, and response variables (COD and CR removal) were given maximium importance (4 out of 5 and 5 out of 5, respectively).…”

Section: Cr Decolorization and Cod Removal In Ec Processmentioning

confidence: 99%

“…PbO 2 coated anodes have a removal rate close to BDD, are of low cost, and can be used for the efficient oxidation of azo dyes and aromatics amines. On the other hand, in the electrocoagulation process by applying electrical current, adsorbents (Fe(OH) 3 , Fe(OH) 2+ , Fe(OH) 2 + and Fe 2 (OH) 2 4+ [30]) are generated on the Fe anode. For this type of dye, Fe has a higher affinity.…”

Section: Introductionmentioning

confidence: 99%

Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems

Romero-Soto

García-Gómez

Álvarez

et al. 2021

Water

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Response surface methodology was investigated to determine the operational parameters on the degradation of Congo red dye (CR) and chemical oxygen demand (COD) in two electrochemical systems evaluated individually on effluent pretreated by an up-flow anaerobic sludge blanket (UASB) reactor. The UASB reactor was fed with 100 mg L−1 of CR and was operated for 12 weeks at different hydraulic residence times (HRTs) of 12 h, 10 h, and 8 h. Once stabilized at an HRT of 8 h, the effluent was collected, homogenized, and independently treated by electrooxidation (EO) and electrocoagulation (EC) cells. On both electrochemical systems, two electrode pairs were used; solid for EC (Fe and stainless-steel) and mesh electrodes for EO (Ti/PbO2 and Ti), and the effect of intensity (A), recirculation flow rate (mL min−1), and experimental time (min) was optimized on response variables. The maximum efficiencies of sequential systems for COD degradation and CR decolorization were 92.78% and 98.43% by EC and ≥99.84% and ≥99.71% by EO, respectively. Results indicate that the coupled systems can be used in textile industry wastewater treatment for the removal of dyes and the decolorized by-products.

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“…[10][11][12][13] The electrochemical treatment in which degradation of residual dye can occur through both reduction and oxidation processes is another proposed method for the removal of aromatic amines and decolorization of azo dyes. [14][15][16][17] However, significant problems can arise during optimization of electrochemical process. Passivation of electrodes and total cost of the process are two of the most serious problems arising from this method.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of novel Mica@reduced graphene oxide fixed rotating disk reactor in treatment of anaerobically reduced textile dyeing wastewater containing aromatic amines

Sohrabpour¹,

Mohamadi

Sharghi

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Anaerobically reduced textile dyeing wastewater containing aromatic amines can cause serious environmental problems as a consequence of their toxicity. RESULTS:The performance of a novel design, laboratory-scale mica@reduced graphene oxide (rGO) reactor fixed on three rotating disks was evaluated for the removal of anaerobically reduced textile dyeing wastewater containing aromatic amines. Fourier-transform infrared and UV-visible spectroscopy analyses of wastewater after anaerobic treatment revealed that it contained high aromatic compound concentrations. Scanning electron microscope images confirmed that the rGO nanosheets were deposited on the mica surface by the spin-coating method aromatic amines adsorbent. The effects of wastewater initial chemical oxygen demand (COD) concentration (100, 500 and 1500 mg L -1 ), pH (5, 7 and 9) and processing temperature (293, 303 and 313 K) on the aromatic compounds and COD removal using the designed reactor were investigated. The results indicated that aromatic molecule adsorption occurred faster with higher wastewater COD concentration. Also, increase in pH improved the mica@rGO adsorption. Likewise, the increase in temperature caused swelling in the stacked graphene layers, resulting in new surfaces for adsorption, leading to an increase in reactor efficiency. The experimental results indicated that the adsorption process fitted well with the Langmuir isotherm model and pseudo-second-order reaction kinetics. The thermodynamic study revealed that the adsorption was spontaneous. CONCLUSION:The improvement in the removal of aromatic molecules by Mica@rGO indicates that the novel designed reactor has a great potential for the treatment of textile wastewater.

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Electrocoagulation of Congo Red dye-containing wastewater: Optimization of operational parameters and process mechanism

Cited by 79 publications

References 59 publications

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems

Performance evaluation of novel Mica@reduced graphene oxide fixed rotating disk reactor in treatment of anaerobically reduced textile dyeing wastewater containing aromatic amines

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