ELECTROCHEMICAL REMOVAL OF NITRATE FROM WASTEWATER USING COPPER CATHODE
Scibulcom Ltd., Bulgaria
Water pollution by nitrates is due to increased use of synthetic nitrogen fertilisers, livestock manure in intensive agriculture, and industrial and municipal effluent discharge. This pollution represents a high risk for aquatic systems and human health. This is why the World Health Organisation (WHO) recommended a maximum limit of 50 mg l–1 for nitrate concentration (NO3−) in drinking water. The purpose of this study is nitrate removal from wastewater by electrochemical reduction using copper (Cu) cathode and platinised titanium (Pt/Ti) anode. Copper has very good electrical properties and a very high electrocatalytic activity for electrochemical cathodic reduction of nitrate. Galvanostatic batch electrolysis of synthetic nitrate wastewaters have been carried out in an undivided electrochemical cell using different nitrate and supporting electrolytes concentrations and current densities as a function of electrolysis time. The influence of these variables on removal efficiency of nitrate, current efficiency and energy consumption was reported.
wastewater, nitrate, electrochemical removal, copper