Modeling of phenol decomposition induced by pulsed corona discharge in water

Abstract

The paper presents the theoretical basis and results of numerical modeling of co-rona discharge phenomenon carried out to determine the value of body force that induces the flow of surrounding fluid. The system of two partial differential equations is solved with the values of electric potential ϕ and space charge density ρq as unknowns. The first equation is of Poisson-type with Laplacian acting on the value of potential and source term dependent on space charge density as well as electric permittivity of the medium. The second equation is current continuity equation, where the current density is composed of charge carrier diffusion term and the term describing their drift in electric field. Particular attention was given to the boundary condition of space charge density due to its indirect nature. Geometry of the problem assumes that positive corona discharge takes place on the sharp edge of the blade-shaped anode while flat grounded plate acts as a cathode. Such configuration enables simplified analysis in 2D Cartesian coordinates assuming that the section plane is sufficiently far from the lateral edges of the blade. The system of equations is solved with MOOSE (Multiphysics Object-Oriented Simulation Environment) Framework released in public domain on GNU LGPL license by Idaho National Laboratory. Presented results include 2D distributions of electric potential, electric field strength, space charge density and body force in air surrounding electrodes.

Characterization and comparative evaluation of two atmospheric plasma sources for water treatment

“…The reaction of phenol with hydroxyl radicals is very fast, the rate constant being 8.0 · 10 9 M −1 s −1 . Ozone also reacts directly with phenol, however at a much slower rate.…”

Mineralization of Phenol in Water by Catalytic Non‐Thermal Plasma Reactor – An Eco‐Friendly Approach for Wastewater Treatment

“…Out of these reactive species, especially ozone and • OH are the key oxidants. These active species may induce ultraviolet photolysis, electro hydraulic cavitations and supercritical water oxidation that may lead to mineralization . As decrease in the ozone concentration on addition of catalyst was established, it is logical to propose ozone induced radical reactions leading to the formation of OH radicals as shown in Equations .…”

“…As decrease in the ozone concentration on addition of catalyst was established, it is logical to propose ozone induced radical reactions leading to the formation of OH radicals as shown in Equations . Also, Dors et al, reported reactions between high energetic electrons present in the discharge streamer and the pollutant molecules in aqueous media that may produce • OH …”

Remove of Phenolic Compounds in Water by Low-Temperature Plasma: A Review of Current Research

“…For the pulsed high-voltage electrical discharge in liquid, initial models of the bulk-phase corona-induced chemical reactions were reported by M. Dors et al [34]. In that study it was assumed that the pulsed corona discharge leads to the formation of hydrogen peroxide, hydroxyl radicals, and aqueous electrons through reactions (1-3) as shown in Table 1.…”

“…It is commonly believed that the phenol degradation with pulsed high-voltage discharge in aqueous solution shows a first-order kinetics: C = C (0) e (-kt) [7,[10][11][12]. M. Dors et al [34] build a chemical kinetics model of phenol decomposition in water. The densities of the species participating in the chemical reactions were calculated with a set of first order, differential equations describing the chemical conversions.…”