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Water disinfection by pulsed atmospheric air plasma along water surface

Authors

  • Chao Zheng,

    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
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  • Yuzhen Xu,

    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
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  • Haomin Huang,

    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
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  • Zhicheng Zhang,

    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
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  • Zhen Liu,

    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
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  • Keping Yan,

    Corresponding author
    1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
    2. Industrial Ecology and Environment Research Institute, Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
    • Correspondence concerning this article should be addressed to K. Yan at kyan@zju.edu.cn.

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  • Anna Zhu

    1. Institute of Chemical Defense, Beijing, China
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Abstract

An above water-pulsed nonthermal plasma technique for water disinfection is reported. Experiments are performed with a 2.5 L plasma reactor and Escherichia coli. When its initial number density is less than 106 cfu/mL, up to six orders reduction can be achieved within 0.5–2.5 min and at a plasma energy density of less than 2 J/mL. The disinfection performance is always effective by controlling water conductivity of below 1.5 mS/cm, which significantly affects plasma generation. Aqueous hydrogen peroxide, ozone, and nitric acid are continuously accumulated inside the reactor by the processing. Plasma generated UV radiation plays an important role in the cell inactivation. Inactivated cell morphology almost remains the same shape, their intracellular protein like green fluorescent protein, however, is destructed according to fluorescence observation. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1458–1467, 2013

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