Optimization of electrocoagulation process for disperse and reactive dyes using the response surface method with reuse application

Criado, Sergio Pérez; Gonçalves, Marcel Jefferson; Tavares, Lorena Benathar Ballod; Bertoli, Sávio Leandro

doi:10.1016/j.jclepro.2020.122690

Cited by 49 publications

(16 citation statements)

References 31 publications

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“…The relative standard deviation or coefficient of variation (CV) indicates the capability of reproducibility and degree of precision (Criado et al, 2020). The low CV values (Y 1 = 1.18%, Y 2 = 10.71%) for the models suggest that the desirable limit values for assessing are reliable and reproducible.…”

Section: Resultsmentioning

confidence: 99%

“…The positive and negative signs of model terms indicate that the particulate parameter has positive and negative effects on the response, respectively (Abbasi et al, 2020). ANOVA was carried out to validate the significance and fit of the developed models, and the results are summarized in The relative standard deviation or coefficient of variation (CV) indicates the capability of reproducibility and degree of precision (Criado et al, 2020). The low CV values (Y 1 = 1.18%, Y 2 = 10.71%)…”

Section: Optimization Of C-f Processmentioning

confidence: 99%

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Optimization of pharmaceutical wastewater treatment by electrocoagulation and dual coagulation

Perumalsamy

Chithra

Ajith

et al. 2022

Water & Environment J

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The present study compares the treatment of pharmaceutical industry wastewater (PIWW) by coagulation‐flocculation (C‐F) and electrocoagulation (EC) techniques using response surface methodology (RSM). EC was performed with waste food‐grade Aluminium (Al) foil as a sacrificial anode. In C‐F, to minimize chemical usage, dual coagulants Aloe vera (organic) and ferric chloride (chemical) were used. Optimization using RSM for C‐F showed chemical oxygen demand (COD) reduction of 60.25 ± 0.28% at optimum operating conditions with R2 = 0.964 and adj‐R2 = 0.928, whereas EC resulted in COD reduction of 78.23 ± 0.38% and energy consumption 1.498 ± 0.0076kWh/m3 with R2 = 0.978 and adj‐R2 = 0.956. The result showed that the use of food‐grade waste Al foil as anode electrode (in EC) and the use of dual coagulant (in C‐F) can reduce COD from industrial effluent efficiently contributing to less hazardous sludge generation.

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Section: Resultsmentioning

confidence: 99%

Section: Optimization Of C-f Processmentioning

confidence: 99%

Optimization of pharmaceutical wastewater treatment by electrocoagulation and dual coagulation

Perumalsamy

Chithra

Ajith

et al. 2022

Water & Environment J

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show abstract

“…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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“…The direct discharge of dye wastewater without treatment may cause severe environmental pollution and ecological issues [6]. A series of treatment methods, such as physical, chemical, and biological treatments, along with their combinations, have been developed and evaluated [7,8]. Recently, increasing interest has been paid to the enzymatic decolorization of synthetic dyes (e.g., laccase) due to numerous advantages-fast reaction, low cost, mild conditions, no generation of undesired by-products such as extra sludge, etc.…”

Section: Introductionmentioning

confidence: 99%

Biodecolorization and Ecotoxicity Abatement of Disperse Dye-Production Wastewater Treatment with Pycnoporus Laccase

Wang

Chen

Guan

et al. 2022

IJERPH

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The biological treatment efficiency of dye wastewater using activated sludge (AS) is largely limited to the chromaticity and ecotoxicity of dyestuff. To alleviate this limitation, eleven industrial-grade disperse dyes were obtained from a fiber-dyeing factory, and for the first time, we studied the decolorization and detoxification effects of using the Pycnoporus laccase enzyme. Efficient decolorization was achieved with the following conditions: dye concentration 50 mg/L, 1-hydroxybenzotriazole (HBT) 0.15 mM, temperature 65 °C, pH 4, and laccase 0.33 U/mL. The decolorization rate of disperse dyes, ranging from 51 to 96% in this investigation, was highly dependent on the dye type, concentration, laccase loading, and HBT. The ecotoxicity of dyes was evaluated by studying the germination/growth of wheat seed as well as the respiratory rate of aerobic AS. Laccase treatment mitigated the phytotoxicity of dyes because of the higher wheat germination (e.g., increase of 38% for Black ECT 200%) and growth rate (e.g., increase of 91% for Blue 2BLN 200%). The reduced ecotoxicity of decolorized dye solution towards microorganisms was also confirmed by the finding that the oxygen uptake by aerobic AS was increased relative to that of the untreated samples (e.g., increase of 14 folds for Blue HGL 200%). In addition, the chemical oxygen demand (COD) of decolorized dye solution was slightly lower than that without decolorization during the respiratory test. The experimental results suggest that enzymatic decolorization and detoxification can be potentially used as a pretreatment method for disperse dye wastewater followed by AS treatment.

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Optimization of electrocoagulation process for disperse and reactive dyes using the response surface method with reuse application

Cited by 49 publications

References 31 publications

Optimization of pharmaceutical wastewater treatment by electrocoagulation and dual coagulation

Optimization of pharmaceutical wastewater treatment by electrocoagulation and dual coagulation

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

Biodecolorization and Ecotoxicity Abatement of Disperse Dye-Production Wastewater Treatment with Pycnoporus Laccase

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