Multivariate optimization of the pulse electrochemical oxidation for treating recalcitrant dye wastewater

Wang, Jiade; Yao, Jiachao; Lou, Wang; Xue, Qinwen; Hu, Zhong‐Ting; Pan, Bingjun

doi:10.1016/j.seppur.2019.115851

Cited by 89 publications

(21 citation statements)

References 34 publications

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“…While the increase in the pulse frequency is higher than 1.0 kHz, there is a rapid decrease in the total hardness removal. This was due to the time of DC power-on and DC power-off time increase, the pulse diffusion layer is made up which impeded the moving of metal ions to the cathode [9,16,19]. Figure 5 shows the effect of pulse frequency on total hardness.…”

Section: Resultsmentioning

confidence: 99%

“…RSM was also investigated to reduce energy consumption during the pulsed EO process by using graphite electrodes [15]. Wang et al [16] reported the optimized method of the operating parameters of the EO under pulse mode for treatment recalcitrant dye wastewater to improve the TOC degradation and the energy consumptions. A study on the different pulse waveforms in pulse electrodepositing for platinum catalyst has been investigated [17].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

Nhut¹,

Vietnan²,

Nhut³

2024

RE&PQJ

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Due to the rapid economic development in recent years, water-chiller is being used more and more in hotels, restaurants, resorts, and industrial zones in Vietnam. The cooling tower’s cooling water quality is an important factor in determining the effect on electrical consumption and the coefficient of performance of a water-cooled chiller. Therefore, it is necessary to maintain the quality of cooling water during the operation time of the water-cooled chiller. The aim of this work is to investigate the effects of the pulse frequency and operational parameters such as current density, pulse duty cycle, and energy consumption on the performance of removing hardness ion of electrochemical cooling water treatment for the cooling tower of the water-cooled chiller. The results show that the highest efficiency of the total hardness removal corresponding to a pulse frequency of 1 kHz, a pulse duty cycle of 0.7, and a current density of 80A/m2.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

Nhut¹,

Vietnan²,

Nhut³

2024

RE&PQJ

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“…There are several current and typical methods can be used to remove of pollutants from the wastewater which by adsorption [7], oxidation [8][9], reduction [10][11], coagulation [12], electrochemical treatment [13], membrane [14] and ion exchange [15]. Heterogeneous catalysts have been used widely in industry especially in water treatment because it easy to recover and more separable than homogenous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Removal of Tartrazine Dye Using Kyllinga Brevifolia Extract And Silver Nanoparticles As Catalysts

Azhar

Kamis

Hamid

et al. 2021

J. Phys.: Conf. Ser.

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The objective of this study was to determine the effectiveness of kyllinga brevifolia (KB) with silver nanoparticles (AgNPs) as catalysts in the removal of tartrazine dye. The experiment was carried out in batch mode. Different parameter such as temperature, initial concentration, contact time and pH were studied. It was found that the equilibrium was achieved in 20 min and the optimum pH was 2. The removal of dye highest at 80 °C, which is 64%. From an initial concentration of 60 ppm and onwards, the removal efficiency of dye was the most (62.34%) when compared to other intial concentrations. The use of a AgNPs as catalyst increases the removal efficiency 20.68% more effective than without a catalyst. Significant of this study is to show the effect of AgNPs as catalyst in tartrazine dye removal from wastewater.

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“…To remove contaminants from dye wastewater, there are many chemical methods to choose, such as flocculation, oxidation, adsorption, − photocatalysis, electrochemical methods, and the membrane process . However, complete elimination of dyes from water cannot be achieved by one single method.…”

Section: Introductionmentioning

confidence: 99%

Hybrid System of Flocculation–Photocatalysis for the Decolorization of Crystal Violet, Reactive Red X-3B, and Acid Orange II Dye

et al. 2020

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A hybrid system of flocculation−photocatalysis (HSFP) was applied to evaluate the color removal from simulative dye wastewater. The decolorization performance of HSFP was investigated considering four key factors: flocculant dosage, pH, turbidity, and ionic strength. Compared with flocculation alone, HSFP showed better decolorization effectiveness for simulative Crystal Violet−Reactive Red X-3B dye wastewater (CV-RR) and simulative Crystal Violet−Acid Orange II dye wastewater (CV-AO). The dosage of flocculant was determined by the molecular structure of target dyes. A higher dosage was required for the color removal of dyes with a lower molecular weight and less sulfonic acid groups. The dominant decolorization mechanism was different with different initial pH values of simulative dye wastewater, which influenced the decolorization efficiency of flocculation and photocatalysis. For dyes with a lower molecular weight and less sulfonic acid groups, better decolorization performance was achieved under neutral conditions, mainly depending on strong charge neutralization and adsorption bridging capacity. For dyes with a higher molecular weight and more sulfonic acid groups, decolorization efficiency was improved with an increase in pH, due to stronger deprotonation. An increase of turbidity reduced the dye removal efficiency of flocculation alone and HSFP. The presence of NaCl, CuCl 2 , and CrCl 3 led to a different decrease in the flocculation efficiency and photodegradation efficiency.

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Multivariate optimization of the pulse electrochemical oxidation for treating recalcitrant dye wastewater

Cited by 89 publications

References 34 publications

Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

Removal of Tartrazine Dye Using Kyllinga Brevifolia Extract And Silver Nanoparticles As Catalysts

Hybrid System of Flocculation–Photocatalysis for the Decolorization of Crystal Violet, Reactive Red X-3B, and Acid Orange II Dye

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