Generation of Radicals using Discharge inside Bubbles in Water for Water Treatment

Miichi, Tomoaki; Hayashi, Nobuya; Ihara, Satoshi; Satoh, Saburoh; Yamabe, Chobei

doi:10.1080/01919510208901636

Cited by 56 publications

(41 citation statements)

References 2 publications

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“…The majority of such studies that have been reported so far used streamer discharges in water, which are generated by the application of high voltage pulses with thin needle-like electrodes. [1][2][3][4] High energy electrons, free radicals, ultraviolet (UV) radiation, ozone, and shock waves generated by such discharges are used for water purification. 5,6) For example, in industrial applications, disinfection by ozone that are generated in the gas phase by corona discharges is widely used for water treatment.…”

Section: Introductionmentioning

confidence: 99%

Radio-Frequency-Driven Atmospheric-Pressure Plasmas in Contact with Liquid Water

Kitano

Aoki

Hamaguchi

2006

Jpn. J. Appl. Phys.

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Atmospheric-pressure plasmas were produced on the surface of liquid water by radio-frequency (RF) power supply. A quartz chamber with an off-center inner electrode was used to generate discharges with a wide range of filling gas pressures. When the chamber was filled with fuel gas and liquid water and a sufficient RF power was supplied to the system, plasmas were observed to be produced around the inner electrode as well as on the water surface. Optical emission spectroscopy (OES) identified the generation of oxidative hydroxyl (OH) radicals and decoloration of methylene blue in the solution demonstrated oxidative capacity of water plasmas generated in this system.

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Section: Introductionmentioning

confidence: 99%

Radio-Frequency-Driven Atmospheric-Pressure Plasmas in Contact with Liquid Water

Kitano

Aoki

Hamaguchi

2006

Jpn. J. Appl. Phys.

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“…Aqueous phase ozone and H 2 O 2 concentration reached 0.774 mg/L and 11.993 mg/L respectively for a 60kV applied voltage. Compared with other studies [6], these concentrations tend to be much higher.…”

Section: Active Species Formedmentioning

confidence: 62%

Bipolar pulsed discharge in the Gas-liquid-solid mixture and its application for water treatment

Zhang

et al. 2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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Bipolar pulsed discharge in the Gas-liquid -solid mixture was studied using a packed bed plasma reactor with gas bubbling. Effect of different packings on the treatment performance was investigated. Light emission and the active species formed during the discharge process were measured. Experimental results proved that bipolar pulsed discharge in the packed bed reactor with gas bubbling had a good performance on dye water decolorization. Color removal rate increased with the applied voltage. Packings had great influence on the color removal of the wastewater. Emission spectrum of the bipolar pulsed discharge in water-air mixture had a wider range and higher intensity. In addition, the concentration of the active species generated in the bipolar pulsed discharge system was proved to be higher than other studies. INSTRUCTIONSElectrical discharge in aqueous solutions has been studied for many years because of its importance in electrical transmission processes and its practical applications for pollution control, inactivation and etc. It has been proved that aqueous electric discharge can generate non-thermal plasma which contains many active species like high energy electrons, H 2 O 2 , O 3 , OH• and etc. These active species can selectively react with the organics dissolved in water and get them oxidized. During this process water is purified. This water treatment technology is an innovative advanced oxidation technology and has attracted much attention these years. It has a very promising application prospect due to its numerous advantages such as high degradation efficiency, nonselective, mild reaction conditions (room temperature and atmospheric pressure), without secondary pollution and etc.Several electrode configurations have been used to generate the non-thermal plasma in water, such as point to plane electrode, wire to cylinder electrode, etc. All these methods, however, possess their own distinctive drawbacks, like low energy efficiency, short life time of the electrode, limit mass transfer area, etc. To eliminate those drawbacks mentioned above, it is necessary to develop more capable reactors to scale up the practical utilization of this technique. For serious demands for efficient water purification that degrades stable compounds, we still need to continue improving the efficiency of the relevant methods.Electrical discharges in water and water-air mixture have been extensively studied in the past several years [1], and most of theses studies focused on unipolar pulsed discharge. Few of researches investigated the discharge in the gas-liquid-solid three-phase mixture powered by the bipolar pulsed power supply.In this study, electrical discharge characteristics of the bipolar pulsed discharge in the packed bed reactor were investigated. Effect of the different solid packings and different gas sources on the color removal performance was studied. Ultraviolet light emitted from the discharge was measured and the typical active species formed in the process were analyzed.

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“…The discharge systems are often very similar to the ones described in Section 3.1 without bubbles. For a plate-to-plate configuration, pulsed streamer discharge mostly occurred inside bubbles adjacent to the electrodes [97].…”

Section: Bubble Discharge Reactorsmentioning

confidence: 99%

Electrical Discharge in Water Treatment Technology for Micropollutant Decomposition

Vanraes¹,

Nikiforov²,

Leys³

2016

Plasma Science and Technology - Progress in Physical States and Chemical Reactions

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Hazardous micropollutants are increasingly detected worldwide in wastewater treatment plant effluent. As this indicates, their removal is insufficient by means of conventional modern water treatment techniques. In the search for a cost-effective solution, advanced oxidation processes have recently gained more attention since they are the most effective available techniques to decompose biorecalcitrant organics. As a main drawback, however, their energy costs are high up to now, preventing their implementation on large scale. For the specific case of water treatment by means of electrical discharge, further optimization is a complex task due to the wide variety in reactor design and materials, discharge types, and operational parameters. In this chapter, an extended overview is given on plasma reactor types, based on their design and materials. Influence of design and materials on energy efficiency is investigated, as well as the influence of operational parameters. The collected data can be used for the optimization of existing reactor types and for development of novel reactors.

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Generation of Radicals using Discharge inside Bubbles in Water for Water Treatment

Cited by 56 publications

References 2 publications

Radio-Frequency-Driven Atmospheric-Pressure Plasmas in Contact with Liquid Water

Radio-Frequency-Driven Atmospheric-Pressure Plasmas in Contact with Liquid Water

Bipolar pulsed discharge in the Gas-liquid-solid mixture and its application for water treatment

Electrical Discharge in Water Treatment Technology for Micropollutant Decomposition

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