Development of ecological processes, based on application of ferrate(VI) and electrochemical oxidation or reduction, for treatment of harmful substances

Exploration, continuing previous project TR19029, covers development of the technology procedures of ecological treatment of contaminants of the organic, inorganic and biological origin, which are frequently present in the industrial and communal wastewaters, applying treatment by means of ferrate(VI) solutions and electrochemical methods based on stable boron doped diamond (BDD) electrodes. The development of the application of BDD electrodes in wastewater pollutants elimination is foreseen as an adjunct for the ferrate(VI) application, because of the great possibilities that BDD electrodes creates in electrochemical treatment of stable organic and inorganic pollutants. From the range of pollutants that appears frequently in wastewaters several are selected for the development of application of both the ferrate(VI) treatment and the electrochemical treatment technologies: heavy metals (As), anions (NO3-, NO2-, S2-, CN-), organics (hydrocarbons, halogenated hydrocarbons, nitrogen containing organics, phenols). One part of the project is dedicated to the improvement of the electrochemical synthesis of ferrate(VI) by development of direct electrochemical oxidation of ferrous or ferric salts on BDD electrode to Fe(VI), stabilization of ferrate(VI) in water solutions by complexion of metal cations (Fe, Ni, Cr, Mn), and synthesis of the more stable ferrates types like ?2(Fe, S)O4.