Influence of pulse width on decolorization efficiency of organic dye by discharge inside bubble in water

Kawano, Shuta; Wada, Keita; Kakuta, Takatoshi; Takaki, Koichi; Satta, Naoya; Takahashi, Katsuyuki

doi:10.1088/1742-6596/441/1/012007

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…Therefore, the combination of liquid phase and gas phase discharge processes showed more synergistic effect [19] which increased the energy efficiency of the treatment process [20]. For this purpose, several techniques for bubbling plasma discharge in water using various bubbling gases and voltage regimes have been developed and studied recently [21][22][23][24][25][26][27][28], for . These techniques showed a greater production of the reactive species and a highly efficient wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of a wire-plate air bubbling plasma for wastewater treatment using nanosecond pulsed high voltage

Abdelaziz

Ishijima

Tizaoui

2018

Journal of Applied Physics

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This study developed a prototype of a wire-plate air bubbling plasma reactor that can be easily scaled up for wastewater treatment. The electrical characteristics, including the discharge current and average power consumed, of the developed reactor were deeply investigated at different operating parameters and solution conductivities. The performance of the reactor was examined on the basis of energy efficiency and methylene blue (MB) decoloration efficiency. Moreover, the removal of the total organic carbon and the changes of the physicochemical properties of solution, including pH, conductivity, and temperature, were evaluated. The analysis of current discharge and average power consumed showed that the discharge mode in the present reactor is a filamentary streamer. Interestingly, the solution conductivity had no effect on the average power consumed at low applied voltages, due to confinement of the discharge in a small area surrounding the discharge electrode in the gas phase. However, at relatively high voltages, the effect of conductivity on the average power consumed was noticeable, yet it had no effect on the decoloration efficiency at the same average power. The present reactor showed a high energy-efficiency value of 42 g/kWh at 50% decoloration of 30 mg/l MB solution, but it dropped to 14 g/kWh at 97% decoloration. A first-order kinetics model described well the decoloration reaction rates and the overall rate constant correlated linearly to the average power.

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Section: Introductionmentioning

confidence: 99%

Development and characterization of a wire-plate air bubbling plasma for wastewater treatment using nanosecond pulsed high voltage

Abdelaziz

Ishijima

Tizaoui

2018

Journal of Applied Physics

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“…There have been reported some experiments in degradation of organic pollutant, such as methylene blue for dyeing, phenol for pharmaceutical manufacture. As the advantages of structure and energy efficiency, discharge in bubble and with short pulsed voltage have been applied in some researches [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acetic Acid in Water Using Gas-Liquid Plasma with SPG Membrane

Tang

Komuro

Takahashi

et al. 2016

Plasma and Fusion Research

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The gas-liquid mixed phase plasma generated by a nanoseconds-pulsed discharge in bubbles was used for degradation of acetic acid in water. A Shirasu porous glass (SPG) membrane tube was adopted as micro-bubble generator and part of a discharge reactor. A large number of tiny bubbles are generated from dense micro-pores (average diameter of φ50 µm) of the SPG wall and a discharge through SPG membrane was initiated between high voltage electrode and bubble surface. Comparing with a resin tube reactor which has six mechanical holes (diameter of φ1 mm), the surface area of bubbles increased with the same gas flow rate. The hydrogen peroxide (H 2 O 2 ) concentration in treated water using SPG membrane reactor increased by about 71% compared with that using the resin tube reactor, and the degradation amount of acetic acid was also promoted by about 82% when Ar gas was used with the flow rate of 2 L/min. Meanwhile the H 2 O 2 production and degradation of acetic acid proportionally increased with the growth of gas flow rate in the SPG membrane reactor.

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“…There are various methods of generating OH radicals by direct decomposition of water, such as the arrangement of electrodes near the water surface, generation of active species in bubbles under water by applying a strong electric field , and the use of cavitation or a plasma jet . In addition, there are numerous reports of the use of gas–liquid interface plasmas for the decomposition of recalcitrant organic substances or of inactivation tests for fungi and other microorganisms .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of an Underwater Plasma Source with a Porous Glass Membrane

Shiomitsu

Sakoda

2015

Elect Comm in Japan

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SUMMARYThe advanced oxidation process (AOP) with hydroxyl radicals (OH) is considered to be useful for water purification through oxidation; therefore, we proposed an underwater plasma source with a porous glass membrane which performed the functions of bubble supply and the formation of microdischarges. We observed bubble formation and light emission from discharges on the surface of the membrane using a high-speed camera and a spectroscope, respectively. In addition, the dependence of gas pressure on the generation of OH radical and the decomposition of recalcitrant organic matter were examined. The obtained results showed that AOP may be more effective when the operating gas pressure is set higher than a pressure which could form bubbles. C⃝

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Influence of pulse width on decolorization efficiency of organic dye by discharge inside bubble in water

Cited by 15 publications

References 16 publications

Development and characterization of a wire-plate air bubbling plasma for wastewater treatment using nanosecond pulsed high voltage

Development and characterization of a wire-plate air bubbling plasma for wastewater treatment using nanosecond pulsed high voltage

Degradation of Acetic Acid in Water Using Gas-Liquid Plasma with SPG Membrane

Characteristics of an Underwater Plasma Source with a Porous Glass Membrane

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