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Title: Electrochemical denitrification of highly contaminated actual nitrate wastewater by Ti/RuO2 anode and iron cathode
Authors: Chauhan R.
Srivastava, Vimal Chandra
Published in: Chemical Engineering Journal
Abstract: The main objective of denitrification process is to obtain N2 as the final product by reduction of NO3 ? along with simultaneous oxidation of by-products like NH4 + and NO2 ?. In this study, Ti/RuO2 and Fe were used as anode and cathode, respectively, for the treatment of actual wastewater containing high concentration of nitrate ion. The current density (J = 142.86–428.57 A/m2), wastewater pH (4–12) and time (t = 15–180 min) were the main studied operating parameters for the electrochemical (EC) reduction and oxidation of real industrial wastewater containing nitrate (NO3 ?), ammonium ion (NH4 +) and chloride. Faraday law was applied for the calculation of specific energy consumption (SEC) during the process. The maximum NO3 ? reduction efficiency of ?46% was obtained at J = 214.29 A/m2 after 180 min with SEC = 149.7 kWh/kg NO3 ? reduced. Maximum total nitrogen (TN) removal efficiency of ?51% was obtained at pH = 12 and J = 285.71 A/m2 with SEC = 220.7 kWh/kg NO3 ? reduced. The reaction mechanism and pathway was established for the EC reduction of NO3 ? and oxidation of NH4 + and NO2 ? simultaneously. Field emission scanning electron microscope (FE-SEM) coupled with energy dispersed X-ray (EDX), atomic force microscopy (AFM) and X-ray diffraction (XRD) were used for the characterization of electrodes before and after wastewater treatment. Reaction intermediates were identified by using gas chromatograph coupled with mass spectroscopy (GC/MS). Operational cost analysis for this wastewater has been done on the basis of lab scale reactor and compared with previously reported for other industrial wastewater. Interestingly no sludge and/or scum was produced during the treatment. This study provides better understanding of the reduction of NO3 ? as well as further oxidation of by-products. © 2019 Elsevier B.V.
Citation: Chemical Engineering Journal (2020), (): -
Issue Date: 2020
Publisher: Elsevier B.V.
Keywords: Current efficiency
Electrochemical reduction and oxidation
Reduction mechanism and pathway
Specific energy consumption
ISSN: 13858947
Author Scopus IDs: 57197047692
Author Affiliations: Chauhan, R., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Srivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Srivastava, V.C.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CH]

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