A Combined Electrocoagulation-Electrooxidation Treatment for Dairy Wastewater

Chakchouk, Ikram; Elloumi, Nada; Belaid, Chokri; Mseddi, Salma; Chaâri, Leïla; Kallel, Monem

doi:10.1590/0104-6632.20170341s20150040

Cited by 45 publications

(14 citation statements)

References 41 publications

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“…The coagulating agent produced is insoluble in water and, when adsorbed on the surface of the contaminant, it forms flocs in a process called flocculation [5, 10]. The gases produced in situ contribute to boron removal by flotation, in which the gaseous molecules interact with the contaminating particles, which remain suspended in the system [10, 18]. In CQ, on the other hand, the coagulating agent, in this case aluminum sulfate, is added to the system and, from the hydrolysis of the salt added, aluminum hydroxide is formed, as demonstrated by T17Al2SO43aq⇋2Al3+aq+3SO42-aq2Al3+aq+6H2Ol⇋2Al…”

Section: Resultsmentioning

confidence: 99%

Boron Removal from Mining and Synthetic Effluents by Electrocoagulation Using Aluminum Electrodes

Silva

Carneiro

Ribeiro

2019

The Scientific World Journal

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The efficiency of the electrocoagulation method to remove boron from synthetic and mining effluents was investigated in this study. Different parameters were tested using boric acid solution and effluent collected from a mining company located in the city of Vitória-ES. The results showed a percentage of boron removal of over 60% for the synthetic and mining effluents, using aluminum electrodes, pH 7.5, current density of 14.82 mA cm−2, and supporting electrolyte of 0.200 mol L−1. The electrocoagulation and chemical coagulation methods were also compared, in which the percentage obtained by electrocoagulation was 56.30% higher for the mining effluent. Thus, electrocoagulation was more efficient in boron removal, especially when appropriate parameters are applied.

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Section: Resultsmentioning

confidence: 99%

Boron Removal from Mining and Synthetic Effluents by Electrocoagulation Using Aluminum Electrodes

Silva

Carneiro

Ribeiro

2019

The Scientific World Journal

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“…E109 oxidation (EO) when EC is not capable to reduce COD with respect to the regulation limits [20].New AOPs based on the electrochemical technology have been investigated in recent years, i.e., the so-called Electrochemical Advanced Oxidation Processes (EAOPs) have been developed. The EAOPs provides several advantages for the prevention and remediation of pollution problems because electron is a clean reagent.…”

Section: No30-(3) 2021 Journal Of Petroleum Research and Studies (Jprs)mentioning

confidence: 99%

Performance of Combined Electrocoagulation-Advanced Electrochemical Oxidation Used for Oil Field Produced Water Treatment

Mohammed¹

2021

Journal of Petroleum Research and Studies

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Considerable amounts of produced water (PW) are usually accompanied with theproduction of oil. This study proposed a combination of electrocoagulation (EC) - electro-Fenton (EF) process for oxidation organic compounds in PW to reduce the chemical oxygendemand (COD) to below regulation limits. The PW used in this study was collected fromoilfield in the Midland Oil Company. Pretreatment of the PW was conducted using batch ECtechnique with aluminum electrodes to eliminate the suspended and dissolved solids and toreduce the COD and treatment cost. Optimization of EC process revealed that optimum currentdensity, pH, and reaction time were 7.83 mA/cm2, 7.24, 20.40 minutes respectively. Underthese conditions the COD removal percentage was 73.97% starting from initial COD of 1730mg/l.Batch and continuous electro-Fenton processes were investigated using dimensionallystable anode Ti-RuO2/IrO2 and activated carbon fiber felt (ACFF) cathode. The effect ofcrucial process variables on COD removal efficiency was investigated using response surfacemethodology. A second order polynomial model equations were constructed and the resultswas analyzed by the analysis of variance (ANOVA). It was concluded that a combination ofelectrocoagulation followed by electro-Fenton process is effective for treating oilfieldproduced water and further improvement can be achieved by photo assisting the process. Atotal COR removal efficiency of 98% was achieved.

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“…EC method was employed to treat chicken processing industry wastewater by introducing an electric current and it was found that the method could effectively remove 92% of COD (Thirugnanasambandham et al 2014). Combination of electrochemical oxidation, chemical coagulation and biological treatment techniques were applied in the effective removal of contaminants from the highly polluted wastewater (Chakchouk et al 2017;Mittal 2007). The treatment of textile industry wastewater using three-step process of electro-coagulation, H 2 O 2 /Fe 2+ / UV and adsorption was employed for the effective removal of color with 76% reduction in COD with high yield (Edison GilPavas et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Sequential three-step process for the treatment of slaughter house wastewater and its optimization using response surface modeling studies

et al. 2021

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The rapid growth in the world population and fast developing industrialization have resulted in the acceleration of environmental pollution due to inadequate treatment methods accompanied by depletion of freshwater. The current research focused on the batch treatment of slaughter house wastewater (SWW) using the sequential three-step electro-coagulation (EC)–electro-oxidation (EO)–adsorption column (AC) processes and to compare the optimized values with the Omani National Standards for the application in irrigation purpose. The characterization of SWW before and after treatment was carried out by measuring chemical oxygen demand (COD), total organic carbon (TOC), total dissolved solids (TDS), turbidity, ammoniacal nitrogen (NH4–N) and conductivity. The optimization of the treatment processes was performed by response surface methodology (RSM) using central composite design. The maximum response obtained using EC unit was 99% with an operating cost of 2.78 USD/m3. The optimum treatment conditions in EC method were found to be 4.0 pH, electrolysis time of 30 min and electrolyte dosage of 5 g/L, with a current density of 18.11 mA/cm2. The maximum reduction in COD was 97% with an operating cost 0.32 USD/m3. The optimum COD reduction in EO method was 84.5% with an operating cost of 6.87 USD/m3. The optimum process parameters in the EO process were observed at 5.0 pH, 56.22 min electrolysis time with 5 g/L electrolyte dosage and a current density of 5 mA/cm2. The response shows 56.27% reduction in COD with an operating cost of 0.088 USD/m3. The study demonstrates that both EC and EO processes for the reduction of COD have a significant effect on the current density. Using adsorption column (AC) studies, the maximum reduction in COD was 76.8% with negligible operating cost. The optimum pH in the case of AC was 7.5, with an effluent flow rate of 8.63 mL/min, and the responses were found to be 76.067%, which indicates both pH and flow rate have significant effect on the % removal of COD.

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A Combined Electrocoagulation-Electrooxidation Treatment for Dairy Wastewater

Cited by 45 publications

References 41 publications

Boron Removal from Mining and Synthetic Effluents by Electrocoagulation Using Aluminum Electrodes

Boron Removal from Mining and Synthetic Effluents by Electrocoagulation Using Aluminum Electrodes

Performance of Combined Electrocoagulation-Advanced Electrochemical Oxidation Used for Oil Field Produced Water Treatment

Sequential three-step process for the treatment of slaughter house wastewater and its optimization using response surface modeling studies

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