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Water disinfection by pulsed atmospheric air plasma along water surface
Author(s) -
Zheng Chao,
Xu Yuzhen,
Huang Haomin,
Zhang Zhicheng,
Liu Zhen,
Yan Keping,
Zhu Anna
Publication year - 2013
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.13929
Subject(s) - hydrogen peroxide , ozone , nitric acid , plasma , chemistry , aqueous solution , atmospheric pressure plasma , analytical chemistry (journal) , chemical engineering , environmental chemistry , inorganic chemistry , biochemistry , organic chemistry , physics , quantum mechanics , engineering
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 10 6 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