Enhanced lead (II) removal with low energy consumption in an electrocoagulation column employing concentric electrodes: process optimisation by RSM using CCD

Khan, Saif Ullah; Mahtab, Mohd Salim; Farooqi, Izharul Haq

doi:10.1080/03067319.2021.1873304

Cited by 27 publications

(8 citation statements)

References 44 publications

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“…At pH 7, the highest adsorption capacity was attained for 45 mg/L As(V), while at pH < 5, the arsenic adsorption was significantly ( p ≤ 0.0003) reduced at the same As(V) levels. Studies in the past have also confirmed the successful application of such models for the optimization of arsenic biosorption process [ 8 , 27 , 28 , 36 ].…”

Section: Resultsmentioning

confidence: 90%

“…Multivariate models can offer a solution for the optimization of SBB as it can simultaneously evaluate many factors with the effective monitoring of the interaction between process parameters. The experimental design can be formulated for the prediction of maximum removal/bioremediation efficiency using simulation techniques [ 26 , 27 ]. Response surface methodology (RSM), especially central composite design CCD, can be applied to multifactorial processes such as SBB to attain optimum conditions for adsorption of arsenic.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, CCD/RSM is less laborious than isotherm models. It can simultaneously promote the assessment of many parameters without any information loss, consequently improving the effectiveness of the process [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Application of BCXZM Composite for Arsenic Removal: EPS Production, Biotransformation and Immobilization of Bacillus XZM on Corn Cobs Biochar

Irshad

Xie

Mao

et al. 2023

Biology

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This study determined the effect of Bacillus XZM extracellular polymeric substances (EPS) production on the arsenic adsorption capacity of the Biochar-Bacillus XZM (BCXZM) composite. The Bacillus XZM was immobilized on corn cobs multifunction biochar to generate the BCXZM composite. The arsenic adsorption capacity of BCXZM composite was optimized at different pHs and As(V) concentrations using a central composite design (CCD)22 and maximum adsorption capacity (42.3 mg/g) was attained at pH 6.9 and 48.9 mg/L As(V) dose. The BCXZM composite showed a higher arsenic adsorption than biochar alone, which was further confirmed through scanning electron microscopy (SEM) micrographs, EXD graph and elemental overlay as well. The bacterial EPS production was sensitive to the pH, which caused a major shift in the –NH, –OH, –CH, –C=O, –C–N, –SH, –COO and aromatic/-NO2 peaks of FTIR spectra. Regarding the techno economic analysis, it was revealed that USD 6.24 are required to prepare the BCXZM composite to treat 1000 gallons of drinking water (with 50 µg/L of arsenic). Our findings provide insights (such as adsorbent dose, optimum operating temperature and reaction time, and pollution load) for the potential application of the BCXZM composite as bedding material in fixed-bed bioreactors for the bioremediation of arsenic-contaminated water in future.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Application of BCXZM Composite for Arsenic Removal: EPS Production, Biotransformation and Immobilization of Bacillus XZM on Corn Cobs Biochar

Irshad

Xie

Mao

et al. 2023

Biology

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“…At the cathode, water electrolysis generates hydroxide ions and H 2 gas, with the generated hydroxide ions compensating for any hydroxide consumption by the dissolved metal ions (e.g., Al 3+ ) to form insoluble metal hydroxide solids. As a result, the pH of the water remains stable, regardless of the coagulant loading. − Because of its pH stability, EC allows for far higher coagulant dosing compared to chemical coagulation, as comparable loading using chemical coagulation would dramatically reduce the pH of the stream and/or require large quantities of an alkalizing agent to restore the pH, which increases salinity.…”

Section: Introductionmentioning

confidence: 99%

Physical and Electrochemical Characterization of Aluminum Electrodes during Electrocoagulation

Khor,

Liao,

Iddya

et al. 2024

ACS EST Water

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Electrocoagulation (EC) of synthetic groundwater was conducted using a sacrificial aluminum electrode in a flow-through EC reactor with short retention times (<1 min) under varying hydrodynamic and electrochemical conditions. The treated water was allowed to settle for 24 h and achieved silicate removal of up to 50 ± 4%, and hardness removal of 11 ± 1%. Physical, chemical, and electrochemical characterization was performed to explore changes in electrode surface morphology and composition. Electrochemical impedance spectroscopy (EIS) showed that chemical reactions at the electrode/water interface are sensitive to changes in the immediate chemical environment. We demonstrate that the most energy-intensive step in EC is aluminum dissolution at the anode, which remained fairly constant due to the continuous renewal of the anode's surface, a result of aluminum dissolution. At the cathode, a structural change in the oxide layer, from γ-Al 2 O 3 to gibbsite, was detected by grazing-incidence X-ray diffraction, which decreased the resistance to charge transfer at the cathode surface, resulting in decreased electrode resistance. The high flow rate in the system minimized the accumulation of aluminum hydroxide solids and aluminum ions at the electrode/water interface, which minimized the formation of thick scalants and amorphous Al(OH) 3 on the cathode and anode, respectively. It was further demonstrated by EIS that under these conditions the resistance to charge transfer was constant throughout the duration of the experiment.

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“…Box Behnken design techniques has several advantages over other factorization method in Design Expert software such as reducing the number of experimental runs and time of operation, cost, material savings and providing a statistical model to describe the process as accurately as possible [17]. Literature reveals that RSM has been successfully employed for modeling and optimization of the various compound removal by EC such as cefazolin antibiotic from pharmaceutical wastewater [18], organic compounds from real graywater [20,21], compounds from clinical wastewater [22], and heavy metals like copper [23], chromium [24], and lead [25].…”

Section: Introductionmentioning

confidence: 99%

Optimization Through Box-Behnken Design for Cr(VI) Degradation from Real Tannery Wastewater Using Graphite Electrode by Electrocoagulation

Bajpai

Sharma

Katoch

2022

Advances in Transdisciplinary Engineering

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The mitigation of tannery effluents is a rising issue owing to the complex mixture of contaminants and hazardous chemicals, mostly chromium. The disposal of tannery effluent into the various water sources such as ponds, lakes, rivers, etc., affects the ecosystem and aquatic lives. The current work scrutinizes the performance of EC unit for Cr(VI) degradation from real tannery effluent. The chromium removal efficiency was evaluated using an iron and graphite electrode in parallel arrangement (MP-P). The iron anode was employed to generate metal coagulant species whereas, graphite served as the cathode. Furthermore, based upon factors mainly pH, current density (CD), electrolysis duration and initial pollutant concentration, the process was statistically optimized using BBD-based response surface methodology (RSM). Optimization of all the four independent variables was determined to be pH = 5.27, CD = 6.26 mA/cm2, electrolysis time = 26.7 minutes and initial concentration = 133.62 mg/L respectively based on which maximum chromium removal efficiency of 89.12% was obtained. Residual, response, probability, 3D surfaces, and contour plots were determined using analysis of variance (ANOVA).

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Enhanced lead (II) removal with low energy consumption in an electrocoagulation column employing concentric electrodes: process optimisation by RSM using CCD

Cited by 27 publications

References 44 publications

Application of BCXZM Composite for Arsenic Removal: EPS Production, Biotransformation and Immobilization of Bacillus XZM on Corn Cobs Biochar

Application of BCXZM Composite for Arsenic Removal: EPS Production, Biotransformation and Immobilization of Bacillus XZM on Corn Cobs Biochar

Physical and Electrochemical Characterization of Aluminum Electrodes during Electrocoagulation

Optimization Through Box-Behnken Design for Cr(VI) Degradation from Real Tannery Wastewater Using Graphite Electrode by Electrocoagulation

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