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Indian Institute of Technology (IIT) Roorkee 
A system and method of simultaneous denitrification and oxidation of industrial wastewaters 
V.C. Srivastava and Rohit Chouhan 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2019-11-15 
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Indian Institute of Technology (IIT) Roorkee 
The present invention provides asystem and method of simultaneous denitrification and oxidation of industrial wastewater. Nitrate ions are being mineralized by the direct and indirect electrochemical mechanism. Direct reduction is mainly done by electrons and H+ whereas indirect mechanism is mainly delivered by highly reactive free radicals like •OH. The dimensionally stable electrodes (DSE) such as without limitation Ti/RuO2, Ti/Pt, Ti/IrO2 were selected as anode whereas metal (such as Fe, Al, etc.) or DSEs were selected as cathode. Effects of various operating conditions like applied current density, wastewater pH, gap and time on the nitrate reduction efficiency with byproduct distribution (NO2− and NH4+) were analyzed. The structural and morphological characterization of the electrodes was carried out by using XRD and FE-SEM techniques. Wear of the electrode was studied with AFM technique. The mechanism for the nitrate reduction as well as oxidation of the ammonium ion was confirmed on the basis of the identified intermediates by Ion Chromatograph (IC). 

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