Performance analysis of a continuous serpentine flow reactor for electrochemical oxidation of synthetic and real textile wastewater: Energy consumption, mass transfer coefficient and economic analysis

Pillai, Indu M. Sasidharan; Gupta, Ashok Kumar

doi:10.1016/j.jenvman.2017.02.046

Cited by 42 publications

(8 citation statements)

References 29 publications

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“…The application of higher current density did not improve reduction performance, which can be attributed to the higher amount of hydroxyl radical produced could not be employed for organic matter oxidation, outstanding to mass transport limitations (Pillai & Gupta, 2017). The variation in percentage of color (dye) removal efficiency with reaction time at different current densities is presented in Figure 3b.…”

Section: Resultsmentioning

confidence: 96%

“…This had an additional benefit as these oxidants helped pollutants in wastewater oxidization. The application of higher current density did not improve reduction performance, which can be attributed to the higher amount of hydroxyl radical produced could not be employed for organic matter oxidation, outstanding to mass transport limitations (Pillai & Gupta, 2017).…”

Section: Resultsmentioning

confidence: 99%

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Water recovery from yarn fabric dyeing wastewater using electrochemical oxidation and membrane processes

Bouchareb¹,

Bilici

Dizge

2022

Water Environment Research

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This study intended to evaluate and compare the efficiency of electrochemical oxidation (EO), nanofiltration (NF), and reverse osmosis (RO) membranes processes in the treatment of yarn fabric dyeing wastewater (YFDW) in terms of chemical oxygen demand (COD) removal, color removal, salinity reduction, and conductivity removal. EO tests of the textile effluent were conducted under various current densities and solution pH conditions employing a graphite electrode. Membrane filtration experiments were conducted using two different NF membranes: NP010 and NP030 and two distinct RO membranes: BW30 and SW30 flat-sheet membranes. The experimental results showed that NF membrane process is not suitable for yarn fabric wastewater treatment showing low removal efficiencies for COD, color, and conductivity. However, both EO and RO membranes could reduce COD and color to high removal performances. EO results showed more than 99% of color removal and 80% of COD elimination at pH = 6 and current density of 50 mA/cm 2 after 180 min of reaction. Using RO membrane for yarn fabric wastewater treatment demonstrated relatively complete removal of color concentration and 98% of COD elimination. However, EO process showed less performance in conductivity removal efficiency compared to the RO membranes. EO treatment of YFDW decreased conductivity by 31.2%, whereas RO membrane process reduced conductivity to a greater extent and recorded 97.1% of removal elimination percentage. Therefore, the treated water by RO membrane could be recycled back to the process such as washing and dyeing, in that way offering economic profits by decreasing water consumption and wastewater treatment cost. Practitioner Points• Electrochemical oxidation and membrane filtration processes were combined for the treatment of yarn fabric dyeing wastewater (YFDW).• A 100% color removal of color and 98.5% COD elimination efficiencies were obtained for the electrochemical oxidation (EO) + RO combined process.• EO treatment of YFDW decreased conductivity by 32.7%, whereas the RO membrane process reduced conductivity to a greater extent and recorded 97.7% of removal elimination percentage.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Water recovery from yarn fabric dyeing wastewater using electrochemical oxidation and membrane processes

Bouchareb¹,

Bilici

Dizge

2022

Water Environment Research

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“…To analyze the economic benefits of the system, the cost of Ni recovery was evaluated through one cycle. In this study, the cost of electric energy was calculated using the energy consumed by the DC power supply and magnetic stirring device as shown in Equation () (Pillai & Gupta, 2017):

\mathrm{W}\ \left(\mathrm{kWh}/\mathrm{g}\right)=\frac{\left(U\times I+P\right)\times t}{m\times 1000}

where u is the applied voltage (V), I is the current intensity (A), t is the reaction time (h), P is the power of the magnetic stirring device (15 W), and m is the Ni recovery amount (g). The comprehensive calculation results of the electrolytic energy consumption are listed in Table S1.…”

Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Stability and Economic Benefit For The Electroch...mentioning

confidence: 99%

Recovery of nickel from electroless nickel plating wastewater based on the synergy of electrocatalytic oxidation and electrodeposition technology

Jiang

Guan

2022

Water Environment Research

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Nickel exists primarily as a stable complex in electroless nickel plating wastewater, and the Ni recovery from it cannot be achieved solely through electrodeposition. As the electrocatalytic oxidation has excellent oxidation potential to break down the complex, an efficient and stable electrochemical system using the synergy of electrocatalytic oxidation and electrochemical deposition technology was developed for the recovery of nickel from electroless nickel plating wastewater. In the present study, the effects of initial pH, current density, and initial nickel ion concentration on the treatment performance of the electrochemical system was investigated. The highest Ni recovery (94.84%) and total organic carbon removal (63.94%) were achieved at a current density of 83.3 mA/cm2, initial pH of 3.0, and initial Ni concentration of 0.01 M. At the same time, the recovered nickel product was confirmed by scanning electron microscopy, energy dispersive X‐ray, X‐ray powder diffraction, and X‐ray photoelectron spectroscopy. Furthermore, the electrochemical system displayed good stability and economic benefits, thereby suggesting its excellent application potential for the treatment of electroless nickel plating wastewater. Practitioner Points An efficient and stable electrochemical system was developed for the recovery of nickel from electroless nickel plating wastewater. In an acidic medium, the nickel recovery rate and TOC removal ratio were 94.84% and 63.94%, respectively. The system displayed good stability, thereby suggesting its excellent application potential for the treatment of nickel plating wastewater.

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“…Hence, selectivity toward the desired product, productivity, and the energy efficiency of the process are affected. To overcome the difficulty of mass transfer limitations, researchers have come up with different designs and suggestions, including an increase of specific electrode area (3D expanded foams electrodes, packed and fluidized beds), turbulence and mixing promoters, − increased linear fluid velocity, increased pressure operation (for solubilized gaseous species like CO 2 ), and optimized designs of electrochemical cells (serpentine flow paths, micro-fluidic, rotating/moving electrodes, ,, ultrasound, and plug-flow fluid orthogonal with mesh electrodes, among others). Some of these techniques require a complex reactor design, i.e., moving parts cause wear and tear on the reactor, increasing the need for regular maintenance, which increases costs.…”

Section: Introductionmentioning

confidence: 99%

Overcoming Mass Transport Limitations in Electrochemical Reactors with a Pulsating Flow Electrolyzer

Pérez‐Gallent¹,

Sánchez-Martínez²,

Geers³

et al. 2020

Ind. Eng. Chem. Res.

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Electrochemical processes are a promising technology for industrial production of chemicals. One of the major drawbacks of electrochemical systems is the low mass transfer of reactants toward the active surface area of the electrode. In this paper, an approach is presented to enhance the mass transfer and increase the overall performance of the reactions. The strategy comprises introduction of a pulsed electrolyte flow in the electrochemical flow cell. This pulsating behavior results in an improved mass transfer of electroactive species due to a higher instantaneous velocity driven by the pulsations. Though the net residence time of the reactants will not be altered due to the pulsation, the resulting enhancement of mass transfer leads to an increase of the conversion. The oxidation of 1,2-propanediol to lactic acid and pyruvic acid mediated by 4-acetamido-(2,2,6,6-tetramethylpiperidin-1-yl) oxidanyl (ACT-TEMPO) was chosen to study the influence of the pulsed flow. Under the pulsating regime, a yield increase of lactic acid of a factor of two and a 15−20% gain in selectivity to a total of 95% toward lactic acid can be achieved by tuning the process parameters.

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Performance analysis of a continuous serpentine flow reactor for electrochemical oxidation of synthetic and real textile wastewater: Energy consumption, mass transfer coefficient and economic analysis

Cited by 42 publications

References 29 publications

Water recovery from yarn fabric dyeing wastewater using electrochemical oxidation and membrane processes

Water recovery from yarn fabric dyeing wastewater using electrochemical oxidation and membrane processes

Recovery of nickel from electroless nickel plating wastewater based on the synergy of electrocatalytic oxidation and electrodeposition technology

Overcoming Mass Transport Limitations in Electrochemical Reactors with a Pulsating Flow Electrolyzer

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