Integrated ozone—electrocoagulation process for the removal of pollutant from industrial effluent: Optimization through response surface methodology

Asaithambi, Perumal; Aziz, Abdul; Daud, Wan Mohd Ashri Bin Wan

doi:10.1016/j.cep.2016.03.013

Cited by 89 publications

(30 citation statements)

References 57 publications

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“…As stated by Faraday's, the hypothetical quantity of coagulant generated is proportionate to the amount of charge passed depending upon current applied and application time. In fact for higher time intervals, more hydroxyl radicals are formed, leading to excessive formation of metal polymeric species thereby increasing the efficiency (Asaithambi, Raman, & Daud, 2016). However, the pollutant removal efficiency in EC does not increase beyond a certain value as within this duration sufficient number of flocs were already available for the removal of a pollutant in order to complete the treatment process (Khandegar & Saroha, 2013).…”

Section: Resultsmentioning

confidence: 99%

Copper (II) removal in a column reactor using electrocoagulation: Parametric optimization by response surface methodology using central composite design

Mateen

Khan

Islam

et al. 2020

Water Environment Research

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In the present work, electrocoagulation was applied for copper removal from aqueous solution employing iron electrodes in a cylindrical reactor. A four‐factorial central composite design (CCD) based on response surface methodology (RSM) was applied to study the effect of various process parameters on removal efficiency and energy consumption as the responses. On optimization, maximum removal efficiency up to 95% was attained with energy consumption as 0.903 W‐hour per gram removal of Cu (II) at applied current 0.26 A, initial copper concentration of 27.8 ppm, application time of 5.4 min and pH 7. The interaction between the process variables was evaluated by using the obtained 3‐D plots. The models generated were validated by analysis of variance (ANOVA). Studies carried on Cu (II) removal rate showed adsorption suited pseudo‐Ist order kinetics best. Overall, the electrocoagulation process proved efficient, low cost and a promising alternative to conventional treatment procedures in removing Cu (II). Practitioner points Adsorption over hydroxide/polyhydroxide complexes of Fe assisted in enhanced removal of Cu (II) by EC. Higher concentrations treated at lower current but longer duration reduces energy. pH was found to be the deterministic factor for coagulation. CCD‐based optimization reduced energy consumption substantially.

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Section: Resultsmentioning

confidence: 99%

Copper (II) removal in a column reactor using electrocoagulation: Parametric optimization by response surface methodology using central composite design

Mateen

Khan

Islam

et al. 2020

Water Environment Research

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show abstract

“…Simple electrochemical or oxidation processes cannot significantly mineralize pollutants. Combining AOPs with other treatment processes, such as electrochemical technologies, is effective to achieve high pollutant removal efficiency at minimum cost [22]. Researchers have reported that the combination of electrochemical processes with ozone processes is a more efficient process because sludge and electrode passivation are lower than those achieved only by electrochemical processes [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Combining AOPs with other treatment processes, such as electrochemical technologies, is effective to achieve high pollutant removal efficiency at minimum cost [22]. Researchers have reported that the combination of electrochemical processes with ozone processes is a more efficient process because sludge and electrode passivation are lower than those achieved only by electrochemical processes [22][23][24]. Ozone-based AOPs are much more efficient than ozone process alone in removal of refractory compounds [25,26].…”

Section: Introductionmentioning

confidence: 99%

Application of a multiple criteria analysis for the selection of appropriate radical based processes in treatment of car wash wastewater

Durna

Genç

2020

Environmental Engineering Research

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In this study, the treatment of car wash wastewater was investigated by radical based hybrid/combined processes. Proposed processes, (Microwave (MW) + persulfate (PS) + Electrocoagulation (EC)), (ozone (O3) + PS + EC) and (MW + PS + O3), were optimized with Taguchi orthogonal array technique for maximum COD removal. The COD removal under optimum conditions was obtained to be 84%, 64.9% and 61.4%, for (MW + PS+ EC), (O3 + PS+ EC) and (MW + PS+ O3) processes, respectively. Operating costs for (MW + PS + EC), (O3 + PS + EC) and (MW + PS + O3) processes have been calculated as 0.2614, 0.1335 and 0.2653 €/L wastewater under optimum operating conditions. Pareto analysis showed that MW time and PS dose are very effective parameters but especially ozone related parameters have no significant effect on COD removal. Processes were evaluated with the PROMETHEE approach in terms of treatment efficiency, operating cost, sludge formation, and preferability criteria to determine the most suitable among the three alternative processes. As a result, the preference order of the processes for the treatment of car wash wastewater with radical based treatment processes was found as (MW + EC + PS) > (MW + O3 + PS) > (O3 + EC + PS).

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“…The textile industry discharges considerable amounts of wastewater into the environment. Up to 15% of this wastewater is, in fact, untreated dye released directly into the environment . Presently, there are more than 100 000 commercial dyes available on the market worldwide, and ~280 000 tons of textile dyes are annually discharged into textile effluents .…”

Section: Introductionmentioning

confidence: 99%

Photo‐Fenton‐peroxide process using FE (II)‐embedded composites based on activated carbon: Characterization of catalytic tests

et al. 2019

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Cost-efficient Fenton-like catalysts for the removal of organic molecules in aqueous solutions were elaborated by a simple process. Porous activated carbons (ACs) were directly impregnated with a precursor solution using the wet impregnation method. Their efficiency as Fenton-like catalysts was studied. Photo-Fenton tests were performed to establish the performance of the prepared Fe-impregnated activated carbons in relation to the degradation of an organic pollutant (Indigo Carmine) model in aqueous solution, under different conditions. Photo-catalytic tests were carried out by means of a laboratory photo-reactor (UV-Consulting Peschl).The influence of several parameters such as solution pH value, initial concentration of the model pollutant, and hydrogen peroxide dose on the process performance was investigated. The ACs and prepared catalysts were characterized by nitrogen adsorption-desorption isotherms at 77 K, SEM, and thermogravimetric analyses. The total Fe content of the synthesized composites was estimated by the phenanthroline method using UV-vis spectrophotometry. The results show an increase in the degradation rate when the heterogeneous photo-Fenton process is conducted with an ozone generating UV lamp. K E Y W O R D Sactivated carbon, anionic dye, composite, Fenton

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Integrated ozone—electrocoagulation process for the removal of pollutant from industrial effluent: Optimization through response surface methodology

Cited by 89 publications

References 57 publications

Copper (II) removal in a column reactor using electrocoagulation: Parametric optimization by response surface methodology using central composite design

Copper (II) removal in a column reactor using electrocoagulation: Parametric optimization by response surface methodology using central composite design

Application of a multiple criteria analysis for the selection of appropriate radical based processes in treatment of car wash wastewater

Photo‐Fenton‐peroxide process using FE (II)‐embedded composites based on activated carbon: Characterization of catalytic tests

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