Removal of nitrates by electrolysis in non-chloride media: Effect of the anode material

► Strong influence of the anode material on the electrochemical reduction of nitrates. ► Great efficiencies when using conductive diamond anodes; smaller when using DSA-O2. ► Key influence of the intermediate nitrite. ► Significant role of electro-generated H2O2, H2 and O2 on the reactivity of nitrite.