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    Microwave Plasma Jet in Water: Effect of Water Electrical Conductivity on Plasma Characteristics

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    Type
    Article
    Authors
    Hamdan, Ahmad
    Profili, Jacopo
    Cha, Min Suk cc
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-09-30
    Online Publication Date
    2019-09-30
    Print Publication Date
    2020-01
    Embargo End Date
    2020-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/660019
    
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    Abstract
    Plasma-induced water treatment is a novel water treatment technique that has shown high efficiency and flexibility. Although the electrical conductivity of impure water varies depending on the degree of pollution, its influence on plasma treatment efficiency is not well understood. In this study, we investigate the fundamentals of a microwave plasma jet submerged in water with electrical conductivities (σw) ranging from 10 to 10,000 µS/cm. The plasma characteristics, namely composition, electron density, and temperature, and their variations as a function of σw, are derived using optical emission spectroscopy. The plasma-bubble dynamics is investigated using space- and time-resolved high-speed imaging. The results show that the plasma fills the bubble volume at relatively low flow rate (typically, < 2 L/min) and high σw (typically, > 1000 µS/cm). The influence of σw on the degradation of methylene blue, a standard water pollutant, is also assessed, and the obtained results indicate that the plasma becomes extremely inefficient at high σw. These findings are of great importance for the community of plasma-induced liquid processing, particularly wastewater treatment.
    Citation
    Hamdan, A., Profili, J., & Cha, M. S. (2019). Microwave Plasma Jet in Water: Effect of Water Electrical Conductivity on Plasma Characteristics. Plasma Chemistry and Plasma Processing. doi:10.1007/s11090-019-10034-5
    Publisher
    Springer Nature
    Journal
    Plasma Chemistry and Plasma Processing
    DOI
    10.1007/s11090-019-10034-5
    Additional Links
    http://link.springer.com/10.1007/s11090-019-10034-5
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11090-019-10034-5
    Scopus Count
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    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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