Application of the response surface methodology (RSM) in heavy metal removal from real power plant wastewater using electrocoagulation

Beiramzadeh, Zahra; Baqersad, Mohamadtaqi; Aghababaei, Mohammad

doi:10.1080/19648189.2019.1640139

Cited by 29 publications

(15 citation statements)

References 63 publications

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“…Moreover, a high value of the corrected coefficient of determination (85.32%) indicates a high degree of model fit to another sample of data from the same population. The obtained values ( R 2 ) are comparable to the other available data regarding heavy metal removal from real power plant wastewater using electrocoagulation ( R 2 = 99.5% and R 2 = 99.6% for iron and nickel, respectively) [ 63 ], biosorption of Hg (II) ions from aqueous media by Polyporus squamosus ( R 2 = 92.4%) [ 64 ] and optimization of coagulation–flocculation process for wastewater originating from automotive industry and containing Fe, Cr, Cu ions ( R 2 = 92.08%, R 2 = 93.62%, R 2 = 71.87% for Fe, Cr, Cu removal, respectively) [ 65 ] and also for organic substances ( R 2 = 0.8477, R 2 adj = 0.7462) [ 66 , 67 ]. Table 5 presents the results of the model adequacy verification using an analysis of variance.…”

Section: Resultssupporting

confidence: 81%

Removal of Heavy Metal Ions from Wastewaters: An Application of Sodium Trithiocarbonate and Wastewater Toxicity Assessment

Thomas¹,

Kozik

Bąk

et al. 2021

Materials

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The synthesis and application of sodium trithiocarbonate (Na2CS3) for the treatment of real galvanic wastewater in order to remove heavy metals (Cu, Cd and Zn) was investigated. A Central Composite Design/Response Surface Methodology (CCD/RSM) was employed to optimize the removal of heavy metals from industrial wastewater. Adequacy of approximated data was verified using Analysis of Variance (ANOVA). The calculated coefficients of determination (R2 and R2adj) were 0.9119 and 0.8532, respectively. Application of Na2CS3 conjugated with CCD/RSM allowed Cu, Cd and Zn levels to be decreased and, as a consequence, ∑Cu,Cd,Zn decreased by 99.80%, 97.78%, 99.78%, and 99.69%, respectively, by using Na2CS3 at 533 mg/L and pH 9.7, within 23 min. Implementation of conventional metal precipitation reagents (NaOH, Ca(OH)2 and CaO) at pH 11 within 23 min only decreased ∑Cu,Cd,Zn by 90.84%, 93.97% and 93.71%, respectively. Rotifer Brachionus plicatilis was used to conduct the assessment of wastewater toxicity. Following the application of Na2CS3, after 60 min the mortality of B. plicatilis was reduced from 90% to 25%. Engagement of Na2CS3 under optimal conditions caused the precipitation of heavy metals from the polluted wastewater and significantly decreased wastewater toxicity. In summary, Na2CS3 can be used as an effective heavy metal precipitating agent, especially for Cu, Cd and Zn.

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Section: Resultssupporting

confidence: 81%

Removal of Heavy Metal Ions from Wastewaters: An Application of Sodium Trithiocarbonate and Wastewater Toxicity Assessment

Thomas¹,

Kozik

Bąk

et al. 2021

Materials

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“…For comparing models, the latter is more relevant than R 2 adj as it is focused on observations that are not involved in the model. 49 The estimated values of R 2 pred expected the developed model to explain about 99.59, 99.89 and 99.94 % for COD (Y 1 ), BOD 5 (Y 2 ), and turbidity (Y 3 ), respectively, of variability in forecasting new findings.…”

Section: Statistical Analysis Optimisation and Model Validationmentioning

confidence: 80%

Modelling and Multi-response Optimisation of Leachate Treatment by Electrocoagulation using Full Central Composite Design

Lessoued¹,

Azizi²,

Lati

et al. 2023

Kemija U Industriji

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Electrocoagulation has lately received much interest as an effective method for the treatment of landfill leachate because of its ease of use, low cost, and environmental friendliness. The present study aimed to investigate the reduction of chemical organic demand (COD), biological organic demand (BOD 5 ), and turbidity from leachate by electrocoagulation process using aluminium electrodes. In order to achieve the maximum removal of pollutants, highlight the key effects of the variables and their simultaneous relationships, full central composite design was applied. Moreover, the backward model selection method using Bayesian Information Criterion and Akaike Information Criterion was carried out to determine the most suitable model with relevant effects. The optimum conditions indicated by the estimated quadratic models were initial pH (5.04), current density (407 A m −2 ), reaction time (74.6 min), and stirring speed (150 rpm), adjusted R 2 of 99.82 %, 99.93 %, and 99.95 % for COD, BOD 5 , and turbidity, respectively. Electrocoagulation was also successful in achieving 90 % COD, 92.3 % BOD 5 , and 99.6 % turbidity removal efficiency. The findings indicated a satisfactory agreement between model forecasts and experimental values.

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“…The solution pH is a key parameter in the removal of pollutants, significantly altering the physicochemical properties of the electrocoagulation process [64]. In the current work, the assays were conducted between 3.56 and 10.44 to evaluate the simultaneous efficacy of initial pH and treatment time for color and COD removal efficiencies ( Figs.…”

Section: Simultaneous Efficacy Of Critical Parameters On the Removal mentioning

confidence: 99%

The treatment of printing and packaging wastewater by electrocoagulation-flotation: the simultaneous efficacy of critical parameters and economics

Emamjomeh¹,

Kakavand²,

Jamali³

et al. 2020

DWT

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In this work, electrocoagulation-flotation (ECF) following sedimentation was applied as a printing and packaging wastewater treatment using four Al electrodes with a parallel monopolar configuration. A sedimentation process was applied after the ECF as a post-treatment phase to remove large pollutants. The simultaneous efficacy of the operating parameters initial color content (1,843.44-12,156.56 ADMI), initial pH (3.56-10.44), current density (6.02-22.18 mA/cm 2), and treatment time (5.62-74.38 min) on color and chemical oxygen demand (COD) removal efficiencies were evaluated alongside processing costs. Response surface methodology (RSM) and central composite design (CCD) optimized these key parameters to achieve the highest removal efficiencies and lowest operating costs. Based on the results analyzed by RSM-CCD, using initial color content of 5,576.38 ADMI, initial pH of 7.29, the current density of 18.49 mA/cm 2 , and treatment time of 59.76 min as optimum operational conditions can result in 97.8% and 92.1% for color and COD removal efficiencies, respectively. At these optimum conditions, operating costs (OPCs), including electrodes material and energy consumption, were 0.07 US$/(kg color removed) and 0.4 US$/(kg COD removed). The results confirm ECF-sedimentation as a promising and costeffective tool for the treatment of printing and packaging wastewater.

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Application of the response surface methodology (RSM) in heavy metal removal from real power plant wastewater using electrocoagulation

Cited by 29 publications

References 63 publications

Removal of Heavy Metal Ions from Wastewaters: An Application of Sodium Trithiocarbonate and Wastewater Toxicity Assessment

Removal of Heavy Metal Ions from Wastewaters: An Application of Sodium Trithiocarbonate and Wastewater Toxicity Assessment

Modelling and Multi-response Optimisation of Leachate Treatment by Electrocoagulation using Full Central Composite Design

The treatment of printing and packaging wastewater by electrocoagulation-flotation: the simultaneous efficacy of critical parameters and economics

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