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Analysis of Non-Thermal Plasma Discharge Contacting Liquid Water Using Plasma Diagnostics and Computer Simulations

Title: Analysis of Non-Thermal Plasma Discharge Contacting Liquid Water Using Plasma Diagnostics and Computer Simulations.
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Name(s): Wang, Huihui, author
Locke, Bruce R., professor directing dissertation
Alabugin, Igor V., (Professor), university representative
Chella, Ravindran, committee member
Alamo, Rufina G., committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Chemical and Biomedical Engineering, degree granting department
Type of Resource: text
Genre: Text
Doctoral Thesis
Issuance: monographic
Date Issued: 2018
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (114 pages)
Language(s): English
Abstract/Description: Non-thermal plasma technology, which can be used as an advanced oxidation process (AOP) for water treatment, has gained significant attention recently. A plasma discharge contacting liquid water generates strong oxidants, such as ·OH and H2O2 and, in the presence of O2, ozone (O3), which are capable of degrading or completely mineralizing many organic pollutants in waste water. The UV irradiation generated during the plasma discharge can enhance the degradation of organic compounds and kill bacteria. Compared with other water treatment methods, the non-thermal plasma technology removes the pollutants completely and rapidly, and it does not introduce any new hazardous materials into the system. However, the high energy cost of non-thermal plasma technology prevents it from being commercialized. Therefore, many studies have been conducted to improve the energy efficiency of the non-thermal plasma technology. This dissertation focused on investigating the influence of operating conditions and the plasma properties on the production of H2O2 during the plasma discharge with liquid water. H2O2 is one of the most important products which indirectly indicates the concentration of ·OH generated by the plasma system. This work focused on the mechanism of H2O2 formation and analyzed the influence of plasma properties including the electron density and gas temperature on H2O2 production. The influence of operating conditions such as discharge power and carrier gases on plasma properties was also investigated. The results provide a general view of H2O2 formation in the plasma-liquid system and provide guidelines for modifying the plasma system to achieve higher efficiency. Another problem using non-thermal plasma to treat industrial waste water is that the high conductivity of waste water causes energy wastage since the current starts to flow through the liquid which generates heat. In addition, some plasma systems with low liquid conductivity tolerance cannot generate a discharge when liquid conductivity is high. Therefore, another goal of this work is to study the influence of liquid conductivity on plasma discharge with water and improve the liquid conductivity tolerance of the plasma system.
Identifier: 2018_Fall_Wang_fsu_0071E_14831 (IID)
Submitted Note: A Dissertation submitted to the Department of Chemical and Biomedical Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester 2018.
Date of Defense: August 2, 2018.
Keywords: computer simulation, non-thermal plasma, plasma chemistry, plasma diagnostics, plasma physics, water treatment
Bibliography Note: Includes bibliographical references.
Advisory Committee: Bruce R. Locke, Professor Directing Dissertation; Igor Alabugin, University Representative; Ravindran Chella, Committee Member; Rufina Alamo, Committee Member.
Subject(s): Chemical engineering
Environmental engineering
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/2018_Fall_Wang_fsu_0071E_14831
Host Institution: FSU

Choose the citation style.
Wang, H. (2018). Analysis of Non-Thermal Plasma Discharge Contacting Liquid Water Using Plasma Diagnostics and Computer Simulations. Retrieved from http://purl.flvc.org/fsu/fd/2018_Fall_Wang_fsu_0071E_14831