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Fast inactivation of microbes and degradation of organic compounds dissolved in water by thermal plasma

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Abstract
The multifunctionality and the advantages of thermal plasma for the fast inactivation of viable cells and degradation of organic compounds dissolved in waste water are presented. A complete bacterial inactivation process was observed and studied using a thermal plasma treatment source with very short application times, in particular for Staphylococcus aureus bundle spore survival. The survival curves and analyses of the experimental data of the initial and final densities of S. aureus bacteria show a dramatic inhibitory effect of the plasma discharge on the residual bacteria survival ratio. As the exposure time increased, the inactivation process rate increased for direct exposure more than it did for indirect exposure. The evaluation of direct and indirect exposure was based on the analysis of the ultraviolet spectrum from the absorbance spectra of the organic compound dye called benzene sulfonate (C16H11N2NaO4S) and of viable cells called S. aureus. Organic compounds were degraded and viable cells were killed in a short time by thermal plasma. Moreover, analyses of total carbon, total organic carbon, and total inorganic carbon showed a fast decrease in organically bound carbon, however, this was not as fast as the absorbance spectra revealed by the exposure time increasing more for direct exposure than indirect exposure. After 100 s of exposure to the organic compound dye the removal had a maximun of 40% for samples with indirect exposure to the plasma and a maximum of 90% for samples with the direct exposure. For both samples, where some organic contaminants still remained in treated water, four electrolytes (KCl, NaCl, Na2SO4, and CH3COONa) were added to be effective for complete sterilization, reaching a purity of 100%. A proposal is made for an optimized thermal plasma water purification system (TPWPS) to improve fast inactivation of microbes and the degradation of organic compounds dissolved in water (especially for direct exposure rather than indirect exposure) using a hybrid plasma torch with an electrical power of 125 kW (500 V–250 A) producing a high-temperature (10 000 K–19 000 K) plasma jet with a maximum gas consumption of 28 mg s−1.
Keywords
water treatment, thermal plasma, direct and indirect exposure, degradation of organic compounds, inactivation of microbes

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Citation

Please use this url to cite or link to this publication:

Chicago
Van Oost, Guido, and Ahmed Rida GALALY. 2018. “Fast Inactivation of Microbes and Degradation of Organic Compounds Dissolved in Water by Thermal Plasma.” Plasma Science and Technology.
APA
Van Oost, G., & GALALY, A. R. (2018). Fast inactivation of microbes and degradation of organic compounds dissolved in water by thermal plasma. PLASMA SCIENCE AND TECHNOLOGY.
Vancouver
1.
Van Oost G, GALALY AR. Fast inactivation of microbes and degradation of organic compounds dissolved in water by thermal plasma. PLASMA SCIENCE AND TECHNOLOGY. 2018;
MLA
Van Oost, Guido, and Ahmed Rida GALALY. “Fast Inactivation of Microbes and Degradation of Organic Compounds Dissolved in Water by Thermal Plasma.” PLASMA SCIENCE AND TECHNOLOGY (2018): n. pag. Print.
@article{8601381,
  abstract     = {The multifunctionality and the advantages of thermal plasma for the fast inactivation of viable
cells and degradation of organic compounds dissolved in waste water are presented. A complete
bacterial inactivation process was observed and studied using a thermal plasma treatment source
with very short application times, in particular for Staphylococcus aureus bundle spore survival.
The survival curves and analyses of the experimental data of the initial and final densities of S.
aureus bacteria show a dramatic inhibitory effect of the plasma discharge on the residual bacteria
survival ratio. As the exposure time increased, the inactivation process rate increased for direct
exposure more than it did for indirect exposure. The evaluation of direct and indirect exposure
was based on the analysis of the ultraviolet spectrum from the absorbance spectra of the organic
compound dye called benzene sulfonate (C16H11N2NaO4S) and of viable cells called S. aureus.
Organic compounds were degraded and viable cells were killed in a short time by thermal
plasma. Moreover, analyses of total carbon, total organic carbon, and total inorganic carbon
showed a fast decrease in organically bound carbon, however, this was not as fast as the
absorbance spectra revealed by the exposure time increasing more for direct exposure than
indirect exposure. After 100 s of exposure to the organic compound dye the removal had a
maximun of 40% for samples with indirect exposure to the plasma and a maximum of 90% for
samples with the direct exposure. For both samples, where some organic contaminants still
remained in treated water, four electrolytes (KCl, NaCl, Na2SO4, and CH3COONa) were added
to be effective for complete sterilization, reaching a purity of 100%. A proposal is made for an
optimized thermal plasma water purification system (TPWPS) to improve fast inactivation of
microbes and the degradation of organic compounds dissolved in water (especially for direct
exposure rather than indirect exposure) using a hybrid plasma torch with an electrical power of
125 kW (500 V–250 A) producing a high-temperature (10 000 K–19 000 K) plasma jet with a
maximum gas consumption of 28 mg s−1.},
  articleno    = {085504},
  author       = {Van Oost, Guido and GALALY, Ahmed Rida},
  issn         = {1009-0630},
  journal      = {PLASMA SCIENCE AND TECHNOLOGY},
  keywords     = {water treatment,thermal plasma,direct and indirect exposure,degradation of organic compounds,inactivation of microbes},
  language     = {eng},
  pages        = {7},
  title        = {Fast inactivation of microbes and degradation of organic compounds dissolved in water by thermal plasma},
  url          = {http://dx.doi.org/10.1088 / 2058-6272 / aac1b7},
  year         = {2018},
}

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