Parallel plate electrochemical reactor model for the destruction of nitrate and nitrite in alkaline waste solutions

摘要

The nitrate and nitrite species present in liquid radioactive waste solutions must be destroyed before permanent disposal of the waste can be accomplished. This process can simultaneously remove hazardous compounds and reduce the volume of the waste. A divided cell parallel plate electrochemical reactor model with multiple reactions at both electrodes and a recirculation tank was developed a simulate the reduction of nitrate and nitrite in alkaline solutions. Since many gases are produced in the process, a flash calculation is used in the model to predict the off gas composition. The gases are assumed to stay in solution in the reactor and are flashed after passing through the reactor. Predictions of the off gas composition, the liquid free composition, reaction current efficiencies, and other quantities of interest for each species versus time or charge passed will be presented. (ERA citation 19:029395)