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Fluid models of gas discharges are typically based on continuity equations and drift-diffusion equations for plasma particle species. The boundary conditions for these equations are an important part of the description of the problem. In this Brief Report, we point out that the most commonly used boundary conditions do not describe the physics properly. We present improved boundary conditions that can be used instead.

A new method for the removal of harmful organic molecules from water is described. A low power corona discharge is created over the aqueous solution. Chemically active species diffuse into the water and then oxidize the target compound, which in this case is the model compound phenol. The energy consumption per removed phenol molecule is one order of magnitude lower compared to the discharge techniques that create a plasma in the water. The reaction mechanism of the conversion is shown by measuring the ozone concentration over the water, the intermediate/final oxidation products and the release of CO2 from the water. Indications are found that the discharge is more than merely an ozone generator.