Comparative Study of Argon and Oxygen Injected Water Surface Barrier Micro Discharge

Autor: Irfan Qasim, Sohaib Hameed, Muhammad Waqar Ahmed
Rok vydání: 2021
Předmět:
Zdroj: Journal of Water Chemistry and Technology. 43:366-372
ISSN: 1934-936X
1063-455X
DOI: 10.3103/s1063455x21050052
Popis: The fatality caused by the bacteria in medical field, environment and especially drinking water has always been a major issue. Therefore the need of new techniques for inactivation of bacteria and especially sterilization of waterborne pathogens always remain under research. Often, a noninfectious strain of E. coli was used as an indicator of pollution and energetic waterborne pathogens, which is dangerous for public. The sterilization mechanisms promoted from conventional methods like chemical methods, oxidation methods, irradiation methods to most nontoxic, non-chemical and advance electrical discharge method known as atmospheric pressure plasma discharge. Atmospheric pressure plasma (APP) is considered as a potential tool for skin pathologies, sterilizing agent and treatment of persistent wounds because of its antibacterial effects. Formulation of plasma sterilized liquids containing highly reactive oxidant species (ROS), ultraviolet (UV) radiations and shock waves of several mega Pascal (MPa), are always essential for medical and environmental applications. We have targeted a negative DC powered water surface barrier micro discharge for the production of ROS including $${\text{O}}{{{\text{H}}}^{\bullet }}$$ radicals, ozone (O3) and hydrogen peroxide (H2O2). Analytical results have been presented for water surface barrier micro-discharge in production of ROS in argon (Ar) and oxygen environments. Statistical methods have been implemented to estimate the yield rate of oxidant species dependent on input power. Spectral and chemical techniques have been used for detection of atmospheric and water dissolved reactive oxidant species. The application of water surface barrier micro-discharge was studied for the degradation of multidrug resistant water borne Escherichia coli (E. coli). The results demonstrated effective sterilization of water borne E. coli by micro-discharge. It has been observed that required input power of oxygen injected discharge is higher than “Ar” injected discharge and it further increases with rise in gas injection rates. A critical outcome of this current study is that the oxygen injected discharge produces higher concentration of ROS in comparison with argon injection, useful as antibacterial source.
Databáze: OpenAIRE
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