scholarly journals Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

2018 ◽  
Vol 6 (4) ◽  
pp. 1199-1205 ◽  
Author(s):  
Dawany Dionisio ◽  
Artur J. Motheo ◽  
Cristina Sáez ◽  
Pablo Canizares ◽  
Manuel A. Rodrigo
Keyword(s):  
Supporting Electrolyte ◽  
Synthetic Wastewater ◽  
Methyl Paraben ◽  
Electro Oxidation

scholarly journals Comparing the Effects of Types of Electrode on the Removal of Multiple Pharmaceuticals from Water by Electrochemical Methods

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2332
Author(s):  
Yu-Jung Liu ◽  
Yung-Ling Huang ◽  
Shang-Lien Lo ◽  
Ching-Yao Hu
Keyword(s):  
Electrode System ◽  
Electrochemical Methods ◽  
Synthetic Wastewater ◽  
Coagulation System ◽  
Transformation Rate ◽  
Lack Of Information ◽  
Pharmaceutical Removal ◽  
Β Blocker ◽  
Electro Oxidation ◽  
Electro Coagulation

Considering the lack of information on simultaneously removing multiple pharmaceuticals from water or wastewater by electrochemical methods, this study aimed to investigate the removal of multiple pharmaceuticals by electro-coagulation and electro-oxidation based on two types of electrodes (aluminum and graphite). The synthetic wastewater contained a nonsteroidal anti-inflammatory drug (diclofenac), a sulfonamide antibiotic (sulfamethoxazole) and a β-blocker (atenolol). The pharmaceutical removal with electro-oxidation was much higher than those with the electro-coagulation process, which was obtained from a five-cell graphite electrode system, while the removal of pharmaceuticals with aluminum electrodes was about 20% (20 µM). In the electro-coagulation system, pharmaceutical removal was mainly influenced by the solubility or hydrophilicity of the compound. In the electro-oxidation system, the removal mechanism was influenced by the dissociation status of the compounds, which are attracted to the anode due to electrostatic forces and have a higher mass transformation rate with the electro-oxidation process. Therefore, atenolol, which was undissociated, cannot adequately be eliminated by electro-oxidation, unless the electrode’s surface is large enough to increase the mass diffusion rate.

scholarly journals Electrochemical Removal of Zinc and Nickel Ions from Wastewater Using Flat Plate Electrodes

2021 ◽  
Author(s):  
Rehan Muhammad Khan
Keyword(s):  
Flat Plate ◽  
Surface Area ◽  
Electrode Surface ◽  
Metal Removal ◽  
Supporting Electrolyte ◽  
Potassium Sulfate ◽  
Synthetic Wastewater ◽  
Electrochemical Technique ◽  
Liquid Flux ◽  
Increasing Trend

Simulated wastewater containing 20ppm of Zn++, 20ppm of Ni++ was treated using an electrochemical technique. This synthetic wastewater was used to simulate the wastewater from metal finishing industries. A rectangular bath integrated with an electrochemical cell consisting of flat plate electrodes (the stainless steel anode and aluminum cathode) was used in the treatment. Potassium sulfate was used as a supporting electrolyte to enhance the removal of Zn++ and Ni++. The effects of volumetric liquid flux, pH and electrode surface area on Zn++ and Ni++ removal were investigated. All experiments were performed at 25ºC and at an applied voltage of 4V. When volumetric flux was raised from 0.0092 to 0.0277m³.m-².s-¹, an increasing trend of the Zn++ and Ni++ removal was observed. The maximum metal removal was observed at a volumeteric liquid flux of 0.0231m³.m-².s-¹. Zn++ and Ni++ were removed by 80% and 34%, respectively, after 48 hours of electrochemical treatment. Moreover, an increase in the removal of Zn++ and Ni++ was observed when the pH was varied from 3.5 to 6.5. The maximum removal of Zn++ and Ni++, 97% and 62%, respectively, occurred at a volumetric liquid flux of 0.0231m³.m-².s-¹ and a pH of 6.5. The experimental values showed a similar increasing trend in the removal of Zn++ and Ni++, when the electrode surface area was increased from 0.024m² to 0.048m²; the removal of Zn++ and Ni++ improved by 14% and 12%, respectively. However, there was no major change in the removal of Zn++ and Ni++ between flat plate and corrugated plate electrodes.

Electro-oxidation of methyl paraben on DSA®-Cl2: UV irradiation, mechanistic aspects and energy consumption

2020 ◽  
Vol 338 ◽  
pp. 135901 ◽  
Author(s):  
Dawany Dionisio ◽  
Lucas H.E. Santos ◽  
Manuel A. Rodrigo ◽  
Artur J. Motheo
Keyword(s):  
Energy Consumption ◽  
Uv Irradiation ◽  
Methyl Paraben ◽  
Electro Oxidation

scholarly journals Electrocoagulation of textile wastewater containing a mixture of organic dyes by iron electrode

2017 ◽  
Vol 7 (2) ◽  
pp. 103 ◽  
Author(s):  
Borislav N. Malinović ◽  
Miomir G. Pavlović ◽  
Tijana Djuričić
Keyword(s):  
Removal Efficiency ◽  
Organic Dyes ◽  
Supporting Electrolyte ◽  
Specific Energy Consumption ◽  
Oxygen Demand ◽  
Color Removal ◽  
Iron Electrode ◽  
Synthetic Wastewater ◽  
Initial Concentration ◽  
The Impact

This study focused on testing the efficacy of iron (Fe) electrode in an electrochemical treatment (electrocoagulation) of wastewater containing a mixture of organic dyes. The mixture consists of the following azo dyes: Acid Black 194, Acid Black 107 and Acid Yellow 116. The present organic dyes are toxic, cause skin and eye irritation and are extremely dangerous to aquatic organisms. The study was conducted on a synthetic wastewater prepared in a laboratory electrochemical reactor. During the research, the impact of the current density, various concentrations of dye and supporting electrolyte, electrolysis duration and <em>pulsed current regime </em><em>were tracked</em>. The results are shown through color removal efficiency, chemical oxygen demand (COD) removal efficiency, current efficiency, and specific energy consumption. At the initial concentration of dye (γ=200 mg/L) and concentration of supporting electrolyte (γ<sub>NaCl</sub>=1 g/L) the color removal efficiency of 80.64% was achieved for 420 seconds of treatment (ј=10 mA/cm<sup>2</sup>). At the initial concentration of dye (γ=50 mg/L) and γ<sub>NaCl</sub>= 8 g/L, the color removal efficiency of 96.01% was attained for 300 seconds of treatment (ј=10 mA/cm<sup>2</sup>)

scholarly journals Application of Taguchi’s experimental design method for optimization of Acid Red 18 removal by electrochemical oxidation process

2018 ◽  
Vol 5 (4) ◽  
pp. 241-248 ◽  
Author(s):  
Zabihollah Yousefi ◽  
Ali Zafarzadeh ◽  
Abdolaziz Ghezel
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
Oxidation Process ◽  
Design Method ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Fractional Factorial ◽  
Synthetic Wastewater ◽  
Electro Oxidation ◽  
Electro Coagulation

Background: Electro-oxidation is developed as an electrochemical method to overcome the problems of the conventional decolorization technologies and is an appropriate alternative for the treatment of colored wastewater from various industries. The purpose of this study was to evaluate the efficiency of the electrochemical oxidation process in removal of chemical oxygen demand (COD) and Acid Red 18 (AR18) dye from aqueous solutions. Methods: In this research, a laboratory scale of electro-coagulation reactor for the treatment of synthetic wastewater was made and studied. The effects of different variables including pH, current density, dye concentration, and electrolysis time were investigated. The experiment steps were designed by DesignExpert 10 software using the selected variables. Finally, the dye and COD analysis was performed by spectrophotometer. The optimization was performed using Taguchi fractional factorial design during the removal of dye and COD. Results: Maximum removal of dye (89%) and COD (72.2%) were obtained at pH=3, current density=20 mA/cm2 , initial dye concentration=100 mg/L, and reaction time=45 min. ANOVA test showed a significant relationship between statistical model and test data. Also, the results indicate that the distribution of the residues of the model was normal. Conclusion: By designing experiments through Taguchi method, the removal process will be optimized and by decreasing the number of experiments, the optimal conditions for pollutant removal will be prepared. The results suggest that the Electro-oxidation system is a very suitable technique for the enhancement of wastewater treatment.

scholarly journals Anodic oxidation of synthetic refinery effluent on lead anode: mass transport and charge rate balance

2021 ◽  
Author(s):  
T. Zier ◽  
S. Bouafia-Chergui ◽  
M. Chabani
Keyword(s):  
Energy Consumption ◽  
Mass Transport ◽  
Anodic Oxidation ◽  
Current Density ◽  
Supporting Electrolyte ◽  
Electric Energy ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Synthetic Wastewater ◽  
Charge Rate

Abstract A synthetic wastewater based on Algiers refinery real effluent was prepared and treated using anodic oxidation. Full factorial plan design was used to conduct the statistical analysis of the results. The aim of the study was to assess the interaction between current density (CD) and stirring degree (SD), and quantify their effects on chemical oxygen demand (COD) removal and electric energy specific consumption (EESC). With an initial COD of 487 mg/l, pH of 5.5 and 0.05 M of Na2SO4 as supporting electrolyte, it was found that a 55 rpm steering degree variation lead to a substantial gain in COD removal and energy consumption, 6% and 8.5 KWh/kg, respectively. Current density was found to have different effect on removal efficiency within the applied stirring domain, and that mass transport coefficient (km) is inversely correlated to energy consumption. Theoretical model describing the process was reviewed and the relation between concentration, hydrodynamics and applied current was emphasized.

scholarly journals Electrochemical Removal of Zinc and Nickel Ions from Wastewater Using Flat Plate Electrodes

2021 ◽  
Author(s):  
Rehan Muhammad Khan
Keyword(s):  
Flat Plate ◽  
Surface Area ◽  
Electrode Surface ◽  
Metal Removal ◽  
Supporting Electrolyte ◽  
Potassium Sulfate ◽  
Synthetic Wastewater ◽  
Electrochemical Technique ◽  
Liquid Flux ◽  
Increasing Trend

Simulated wastewater containing 20ppm of Zn++, 20ppm of Ni++ was treated using an electrochemical technique. This synthetic wastewater was used to simulate the wastewater from metal finishing industries. A rectangular bath integrated with an electrochemical cell consisting of flat plate electrodes (the stainless steel anode and aluminum cathode) was used in the treatment. Potassium sulfate was used as a supporting electrolyte to enhance the removal of Zn++ and Ni++. The effects of volumetric liquid flux, pH and electrode surface area on Zn++ and Ni++ removal were investigated. All experiments were performed at 25ºC and at an applied voltage of 4V. When volumetric flux was raised from 0.0092 to 0.0277m³.m-².s-¹, an increasing trend of the Zn++ and Ni++ removal was observed. The maximum metal removal was observed at a volumeteric liquid flux of 0.0231m³.m-².s-¹. Zn++ and Ni++ were removed by 80% and 34%, respectively, after 48 hours of electrochemical treatment. Moreover, an increase in the removal of Zn++ and Ni++ was observed when the pH was varied from 3.5 to 6.5. The maximum removal of Zn++ and Ni++, 97% and 62%, respectively, occurred at a volumetric liquid flux of 0.0231m³.m-².s-¹ and a pH of 6.5. The experimental values showed a similar increasing trend in the removal of Zn++ and Ni++, when the electrode surface area was increased from 0.024m² to 0.048m²; the removal of Zn++ and Ni++ improved by 14% and 12%, respectively. However, there was no major change in the removal of Zn++ and Ni++ between flat plate and corrugated plate electrodes.

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