NDLI: Application of a Novel CO$_{2}$ DC Thermal Plasma Torch Submerged in Aqueous Solution for Treatment of Dissolved Carboxylic Acid

Content Provider	Springer Nature Link
Author	Safa, Sanaz Soucy, Gervais
Copyright Year	2014
Abstract	A novel direct current (DC) plasma torch, operating with a gas mixture consisting of carbon dioxide and hydrocarbon (methane), has been adapted and used for the first time for treatment of a solution containing dissolved carboxylic acid. Compared with conventional DC thermal plasma torches, this novel torch has high plasma enthalpy, high thermal conductivity, low cost and often readily available operating gas (CO$_{2}$) and long electrode life-time. Performance of this CO$_{2}$/CH$_{4}$ DC thermal plasma torch submerged in aqueous solution was investigated for decomposition of dissolved organic contaminants. Sebacic acid was selected as a representative of organic pollutants in wastewater of chemical process industries. Effect of different operational conditions including treatment time, initial solution pH, and the reactor pressure as well as the role of oxidizing agents such as (H$_{2}$O$_{2}$) were investigated on decomposition rate of sebacic acid and its intermediate products. It was shown that the submerged CO$_{2}$/CH$_{4}$ DC thermal plasma could decompose carboxylic acid. The highest decomposition rate was obtained at neutral solution pH. Adding H$_{2}$O$_{2}$ could significantly enhance the decomposition rate due to synergetic effect of ultraviolet radiation (UV) absorption and hydrogen peroxide oxidation. Photo-oxidation was also proposed as the decomposition mechanism with the novel CO$_{2}$/CH$_{4}$ plasma torch based on its high level of UV. This work shows the ability of this novel plasma torch for treatment of organic acids in liquids and solutions and therefore offers a new application for the CO$_{2}$/CH$_{4}$ thermal plasma in wastewater treatment.
Starting Page	21
Ending Page	43
Page Count	23
File Format	PDF
ISSN	02724324
Journal	Plasma Chemistry and Plasma Processing
Volume Number	35
Issue Number	1
e-ISSN	15728986
Language	English
Publisher	Springer US
Publisher Date	2014-08-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$/CH$_{4}$ thermal plasma torch Submerged Reaction mechanism UV radiation Inorganic Chemistry Mechanics Characterization and Evaluation of Materials Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Condensed Matter Physics Chemical Engineering

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