Development of Pulsed Discharge Inside Bubble in Water

Takahashi, Katsuyuki; Yagi, Ippei; Takaki, Koichi; Satta, Naoya

doi:10.1109/tps.2011.2164095

Cited by 21 publications

(17 citation statements)

References 5 publications

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“…perviridis. When air flows into the high voltage electrode, discharge is generated from the tip of W wire placed in the glass tube, which changes to streamer discharge and finally progresses into bubble [18]. Figure 1 shows the schematic of the hydroponics system.…”

Section: Introductionmentioning

confidence: 99%

“…Air is injected into the glass tube, of which high voltage electrode is grounded, at a rate of 0.5 L/min using air pump (NISSO Silent β-30NPS-001). When air flows into the high voltage electrode, discharge is generated from the tip of W wire placed in the glass tube, which changes to streamer discharge and finally progresses into bubble [18]. Figure 3 shows the circuit diagram of the high voltage power supply.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Growth Rate of Brassica para var. perviridis by Discharge inside Bubble under Water in Hydroponic Cultivation

Takano

Takahata

Takaki

et al. 2016

Elect Comm in Japan

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An effect of discharge plasma irradiation to the circulating water in hydroponic cultivation system on plant growth rate was evaluated using Brassica rapa var. perviridis as specimen. The discharge plasma produced acids in the solution, which acts as a fertilizer. The Brassica rapa var. perviridis were cultivated in period of 42 days with the hydroponic system. The experimental result indicated that the growth rate of the Brassica rapa var. perviridis is improved drastically with the discharge treatment of the solution of hydroponic system, especially content of leaf blade is significantly increased (p < 0.01). C⃝ 2016 Wiley Periodicals, Inc. Electron Comm Jpn, 99(11): 72-79, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Growth Rate of Brassica para var. perviridis by Discharge inside Bubble under Water in Hydroponic Cultivation

Takano

Takahata

Takaki

et al. 2016

Elect Comm in Japan

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“…Although the amplitudes of these peaks are less than the onset voltage value, current pluses were observed. This indicates that the microdischarges of the filamentary streamers from the main discharge (ignited at the main peak voltage) are accumulated over the inner surface of the acrylic tube [26] and leads to enhance the applied voltage of the associated peaks to simulate the discharge re-ignition. Figure 3 also shows that the solution conductivity (50 and 1000 S/cm) has no significant influence on the shape of the applied voltage.…”

Section: Plasma Characteristicsmentioning

confidence: 99%

“…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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“…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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Development of Pulsed Discharge Inside Bubble in Water

Cited by 21 publications

References 5 publications

Improvement of Growth Rate of Brassica para var. perviridis by Discharge inside Bubble under Water in Hydroponic Cultivation

Improvement of Growth Rate of Brassica para var. perviridis by Discharge inside Bubble under Water in Hydroponic Cultivation

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

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