Treatment of petroleum refinery wastewater by electrochemical oxidation using graphite anodes

An electrochemical oxidation method was performed in a batch electrochemical reactor using graphite anodes for treating an effluent obtained from Al-Diwaniyah petroleum refinery plant. The effective f process parameters like current density (4-20m Acm-2), pH (3-9), and NaCl concentration (0-3 g/l) on the COD and phenol removal efficiency have been investigated. The results reveal that the best conditions were current density 12 mA cm-2, pH 7, NaCl concentration 2 gl-1 at a treatment time of 60 minutes. Under best conditions of COD removal efficiency 100% and phenol removal efficiency 99.12% were obtained at current efficiency 33.5% and power consumption 59.9 kWh/kg COD. The anodic oxidation was proven to be efficient for treatment Al-Diwaniyah petroleum refinery effluent to get effluent with features in agreement with the standard limits for discharge to the environment at a lower cost.

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Experimental Study on Papermaking Wastewater by Advanced Electrochemical Oxidation Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1699 ◽

2013 ◽

Vol 726-731 ◽

pp. 1699-1703

Author(s):

Lin Lin Huang ◽

Jun Feng Liu ◽

Bin Sun ◽

Nan Zhang ◽

Yong Qing Tang ◽

...

Keyword(s):

Electrochemical Oxidation ◽

Current Density ◽

Treatment Time ◽

Oxygen Demand ◽

Treatment Method ◽

Electrochemical Reactor ◽

Advanced Treatment ◽

Processing Unit ◽

Optimum Reaction ◽

Papermaking Wastewater

Papermaking wastewater effluent from a biological processing unit was treated by an advanced treatment method-electrochemical oxidation process. The experiments were carried out in an electrochemical reactor using RuO2\SnO2 coated on titanium as anode and stainless steel as cathode. The changes of Chemical Oxygen Demand (COD) reduction and other relative parameters have been determined as a function of treatment time and applied current density. The optimum reaction time and current density was 60min and 5mA/cm2, respectively. Results indicate that as an advanced treatment method, electrochemical oxidation can treat papermaking wastewater to achieve the standard of effluents effectively.

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Optimization of process parameters for the electrochemical oxidation treatment of petroleum refinery wastewater using porous graphite anode

Al-Qadisiyah Journal for Engineering Sciences ◽

10.30772/qjes.v13i2.652 ◽

2020 ◽

Vol 13 (2) ◽

pp. 125-135

Author(s):

Ahmad Salah Fahim ◽

Ali H. Abbar

Keyword(s):

Removal Efficiency ◽

Current Density ◽

Petroleum Refinery ◽

Oxygen Demand ◽

Chloride Ion ◽

Electrochemical Reactor ◽

Electrochemical Treatment ◽

Operating Conditions ◽

Graphite Anode ◽

Porous Graphite

The present paper deals with the electrochemical treatment of wastewaters generated from Al-Diwaniyah petroleum refinery plant in a batch electrochemical reactor using stainless steel cathode and porous graphite anode. Effects of operating parameters such as current density (5-25mA/cm2), pH (3-9), addition of NaCl (0-2g/l), and time (20–60min) on the removal efficiency of chemical oxygen demand (COD) were investigated. The results revealed that both pH and NaCl addition have the main effect on the COD removal efficiency confirming that the system was governed by reaction conditions in the bulk of solution not upon the electro oxidation of chloride ion on the surface of the electrode. Parametric optimization was carried out using Response Surface Methodology (RSM) combined with Box–Behnken Design (BBD) to maximize the removal of COD. Under optimized operating conditions of initial pH: 3, current density = 25 mA/cm2, NaCl conc. = 2g/l, and time = 60 min, the removal efficiency of COD was found to be 98.16% with energy consumption of 9.85 kWh/kgCOD which is relatively lower than the previous works.

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Investigating the Result of Current Density, Temperature, and Electrolyte Concentration on COD: Subtraction of Petroleum Refinery Wastewater Using Response Surface Methodology

Water ◽

10.3390/w13060835 ◽

2021 ◽

Vol 13 (6) ◽

pp. 835

Author(s):

Sharon Chakawa ◽

Mujahid Aziz

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Removal Efficiency ◽

Current Density ◽

Petroleum Refinery ◽

Cod Removal ◽

Refinery Wastewater ◽

Cod Removal Efficiency ◽

Petroleum Refinery Wastewater ◽

Nacl Concentration

Electrochemical oxidation (EO) investigated chemical oxygen demand (COD) subtraction from petroleum refinery wastewater (PRW) as a capable remediation process. Titanium substrates coated with iridium–tantalum oxide mixtures (Ti/IrO2–Ta2O5) were used as the dimensional stable anode (DSA). The Box-Behnken Design (BBD), a statistical experimental design and response surface methodology (RSM), was used to matrix the current density, temperature, and electrolyte (NaCl) concentration variables, with COD removal efficiency as the response factor. A second-order verifiable relationship between the response and independent variables was derived where the analysis of variance displayed a high coefficient of determination value (R2 = 0.9799). The predicted values calculated with the model equations were very close to the experimental values where the model was highly significant. Based on the BBD for current density, the optimum process conditions, temperature and electrolyte (NaCl) concentration were 7.5 mA/cm2, 42 °C and 4.5 g/L, respectively. They were resulting in a COD removal efficiency of 99.83% after a 12-hour EO period.

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Electrochemical oxidation of sulfamethoxazole using Ti/SnO2-Sb/Co-PbO2 electrode through ANN-PSO

Journal of the Serbian Chemical Society ◽

10.2298/jsc180810025w ◽

2019 ◽

Vol 84 (7) ◽

pp. 713-727 ◽

Cited By ~ 2

Author(s):

Jiteng Wan ◽

Chunji Jin ◽

Banghai Liu ◽

Zonglian She ◽

Mengchun Gao ◽

...

Keyword(s):

Aqueous Solution ◽

Electrochemical Oxidation ◽

Removal Efficiency ◽

Current Density ◽

Ph Value ◽

Ann Model ◽

Solution Ph ◽

Pbo2 Electrode ◽

Artificial Neural Network Ann ◽

Major Factors

Even in a trace amounts, the presence of antibiotics in aqueous solution is getting more and more attention. Accordingly, appropriate technologies are needed to efficiently remove these compounds from aqueous environments. In this study, we have examined the electrochemical oxidation (EO) of sulfamethoxazole (SMX) on a Co modified PbO2 electrode. The process of EO of SMX in aqueous solution followed the pseudo-first-order kinetics, and the removal efficiency of SMX reached the maximum value of 95.1 % within 60 min. The effects of major factors on SMX oxidation kinetics were studied in detail by single-factor experiments, namely current density (1?20 mA cm-2), solution pH value (2?10), initial concentration of SMX (10?500 mg L-1) and concentration of electrolytes (0.05?0.4 mol L-1). An artificial neural network (ANN) model was used to simulate this EO process. Based on the obtained model, particle swarm optimization (PSO) was used to optimize the operating parameters. The maximum removal efficiency of SMX was obtained at the optimized conditions (e.g., current density of 12.37 mA cm-2, initial pH value of 4.78, initial SMX concentration of 74.45 mg L-1, electrolyte concentration of 0.24 mol L-1 and electrolysis time of 51.49 min). The validation results indicated that this method can ideally be used to optimize the related parameters and predict the anticipated results with acceptable accuracy.

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Simultaneous decolorization of binary mixture of Reactive Yellow and Acid Violet from wastewaters by electrocoagulation

Water Science & Technology ◽

10.2166/wst.2011.306 ◽

2011 ◽

Vol 63 (8) ◽

pp. 1644-1650 ◽

Cited By ~ 2

Author(s):

Can Serkan Keskin ◽

Abdil Özdemir ◽

İ. Ayhan Şengil

Keyword(s):

Removal Efficiency ◽

Current Density ◽

Oxygen Demand ◽

Cod Removal ◽

Time Duration ◽

Synthetic Dye ◽

Nacl Concentration ◽

Optimum Ph ◽

Dyestuff Wastewater ◽

Acid Violet

Dyes are common pollutants in a large variety of industrial wastewaters, and the treatment of these wastes has been extensively studied by coagulation. For the removal of pollutants from the wastewaters, different techniques have been used and electrocougulation is one of the widely used methods. This process is very effective in removing organic pollutants including dyestuff wastewater. The purposes of this study were to investigate the effects of the operating parameters, such as current density, electrolyte concentration, dyestuff concentration, and pH of solution on decolorization and chemical oxygen demand (COD) removal of wastewater containing two different dyes in same solution by direct current electrocoagulation. The amount of dye removed was found by application of first derivative spectrophotometric method to the synthetic dye mixtures. In this work synthetic dye mixture which include C.I. Reactive Yellow 145 (RY145) and C.I. Acid Violet 90 (AV 90) were used for electrocougulation (EC) process with iron electrodes. In the presence of both dye molecules, the optimum pH was found to be 4, optimum NaCl concentration was 3000 mg/L and optimum current density was 5.56 mA/cm2. Under these conditions in the case of 100 mg/L−1 each dye concentration at 20°C and 3 cm interelectro distance the color removal efficiency was reached 97.7% for AV 90 and 97.1% for RY145 in 10 minutes time duration. Dye concentration dependent highest COD removal efficiency was measured as 82% around at 100 mg/L dye concentration.

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Efficient removal of phenol from aqueous solution by the pulsed high-voltage discharge process in the presence of H2O2

10.31221/osf.io/arfs5 ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Removal Efficiency ◽

High Voltage ◽

Treatment Time ◽

Phenol Degradation ◽

Temperature Treatment ◽

Phenol Removal ◽

Discharge Process ◽

Efficient Removal ◽

Solution Ph ◽

High Voltage Discharge

This study investigates the phenol degradation by pulsed high-voltage discharge (PHVD). The effect of solution pH, temperature, treatment time and initial phenol concentration on phenol degradation were examined. The results showed that the phenol removal efficiency was increased with the rise of pH, temperature and treatment time. The phenol removal efficiency was 48%, 46%, 42% and 34%, respectively at 10, 40, 90 and 160 ppm phenol solutions. The phenol degradation rate was increased markedly when H2O2 was added into the solution. Almost complete phenol degradation (100%) was achieved when 20-40 mM of H2O2 was added into phenol solutions of 40, 90 and 180 ppm.

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Treatment of Tannery Wastewater by Electrochemical Oxidation Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.361-363.697 ◽

2013 ◽

Vol 361-363 ◽

pp. 697-700

Author(s):

Lin Lin Huang ◽

Jun Feng Liu ◽

Nan Zhang ◽

Bin Sun ◽

Yu Jie Feng

Keyword(s):

Electrochemical Oxidation ◽

Oxidation Process ◽

Treatment Time ◽

Chloride Concentration ◽

Oxygen Demand ◽

Electrochemical Reactor ◽

Tannery Wastewater ◽

Processing Unit ◽

Applied Current ◽

Toc Removal

Electrochemical oxidation process was adopted to treat the tannery wastewater effluent from a biological processing unit. The experiments were carried out in an electrochemical reactor using RuO2\SnO2coated on titanium as anode and stainless steel as cathode. The changes of Chemical Oxygen Demand (COD) reduction, Total Organic Carbon (TOC) removal and other relative parameters have been determined as a function of treatment time, applied current density and chloride concentration. Results indicate that electrochemical oxidation can treat tannery wastewater effectively. The results obtained at 7.5mA/cm2demonstrated that 48.7% of TOC and 58.9% of COD were degraded in 150min of processing. In addition, the addition of chloride showed no significant to the removal of COD and TOC.

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Electrochemical Degradation of Phenol Using the Oxygen Diffusion Cathode in an Undivided Cell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.183-185.575 ◽

2011 ◽

Vol 183-185 ◽

pp. 575-579

Author(s):

Hui Wang ◽

Zhao Yong Bian ◽

Guang Lu ◽

Xiang Jia Wei ◽

Xiu Juan Yu ◽

...

Keyword(s):

Removal Efficiency ◽

Current Density ◽

Electrolyte Concentration ◽

Supporting Electrolyte ◽

Phenol Degradation ◽

Oxygen Demand ◽

Degradation Pathway ◽

Phenol Removal ◽

Electrochemical Degradation ◽

Undivided Cell

Electrochemical degradation of phenol was studied in an undivided cell with a Ti/IrO2/RuO2 anode and a carbon/polytetrafluoroethylene (C/PTFE) O2-fed cathode which produced hydrogen peroxide (H2O2) by the electro-reduction of dissolved oxygen. The effect of current density, supporting electrolyte concentration and initial pH on the removal efficiency of phenol were investigated systematically. Results indicated that the optimal removal efficiency of phenol was achieved under the conditions of current density of 39 mA/cm2 and supporting electrolyte concentration of 0.02 mol/L. The phenol removal efficiency in the neutral condition was higher than that of acidic and basic conditions. The chemical oxygen demand (COD) and total organic carbon (TOC) removal achieved 71.6% and 63.6% for 100 min’s electrolysis, respectively. Benzoquinone, maleic acid, oxalic acid, acetic acid and formic acid were identified as intermediates by HPLC. A general phenol degradation pathway involving all these intermediates was proposed.

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