High conductivity solution treatment by non-thermal plasma T-shaped mini electrochemical reactors

The non-thermal plasma (NTP) technology has been shown to be effective at removing organic compounds from wastewater and gases. It was demonstrated that the efficiency of aqueous solution treatment by NTP electrochemical reactors depends on the interfacial contact between the solution treated and the plasma zone. This paper is focused on the analysis of non-thermal plasma treatment of solutions with high conductivity values. The wastewater, which has a high conductivity of 0.3,0.6 and $0.9 \mathrm{mS} / \mathrm{cm}$, was passed through a T-shaped plasma reactor with two inlets (for water and gas) and one outlet (for plasma activated water - PAW). The reactor configuration uses a pulsed high-voltage discharge, thereby decreasing the energy injected into the reactor. The evolution of pH, conductivity, hydrogen peroxide formation and average reactor power were studied for 4 different flow rates (5, 10, 15 and $20 \mathrm{~mL} / \mathrm{min})$ with $A R$ as carrier gas at a flow rate of $4 L / \mathrm{min}$. Solutions with higher conductivity values were studied, but electrical discharge could not be formed at conductivities higher than $0.9 \mathrm{mS} / \mathrm{cm}$ with flow rate of AR at $4 \mathrm{~L} / \mathrm{min}$.