Abstract
The main objective of the present work was to understand the interactive behaviour of various operating parameters including concentration of pollutants during binary electrochemical mineralization of the two nitrogenous heterocyclic pollutants in the aqueous solution. Indole and pyrrole were selected as pollutants, whereas Pt/Ti was selected as anode and cathode. The effects of different operating parameters like current density, solution conductivity, initial concentration of the pollutants and time were studied. Taguchi method was used to optimize these operating parameters for obtaining the ultimate rate of degradation for the nitrogenous compounds. There were basically two responses, i.e. chemical oxygen demand (COD) degradation and specific energy consumption. These responses were maximized and minimized, respectively. At the optimum condition, removal efficiencies of pyrrole, indole and COD were found to be 46.1%, 62.4% and 61.4%, respectively. The optimum value of specific energy consumption was found to be 159.5 kWh per kg COD removed. Possible mineralization pathways are also proposed on the basis of the identified intermediates by gas chromatography coupled with mass spectroscopy. The operating cost was also calculated for the binary lab-scale treatment of the indole and pyrrole and compared with reported cost analysis for the electrochemical treatment.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Authors thank Quality Improvement Programme (QIP) of All India Council for Technical Education (AICTE), India, and Ministry of Human Resources and Development (MHRD), India, for providing their financial support.
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Quality Improvement Programme (QIP) of All India Council for Technical Education (AICTE), India; and Ministry of Human Resources and Development (MHRD), India.
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Material preparation, data collection and analysis were performed by Ajay Devidas Hiwarkar (ADH), Rohit Chauhan (RC), Ritesh Patidar (RP) and Seema Singh (SS). The first draft of the manuscript was written by Rohit Chauhan (RC) and Ritesh Patidar (RP) and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
Conceptualization: Vimal Chandra Srivastava (VCS) and Indra Deo Mall (IDM); Methodology: Vimal Chandra Srivastava (VCS), Indra Deo Mall (IDM), Ajay Devidas Hiwarkar (ADH) and Seema Singh (SS).
Formal analysis and investigation: Ajay Devidas Hiwarkar (ADH), Rohit Chauhan (RC) and Ritesh Patidar (RP)
Writing - original draft preparation: Ajay Devidas Hiwarkar (ADH), Rohit Chauhan (RC)] and Ritesh Patidar (RP);
Writing - review and editing: Rohit Chauhan (RC) and Ritesh Patidar (RP);
Funding acquisition: Ajay Devidas Hiwarkar (ADH);
Software: Ajay Devidas Hiwarkar (ADH) and Ritesh Patidar (RP)
Supervision: Vimal Chandra Srivastava (VCS) and Indra Deo Mall (IDM).
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Hiwarkar, A.D., Chauhan, R., Patidar, R. et al. Binary electrochemical mineralization of heterocyclic nitrogenous compounds: parametric optimization using Taguchi method and mineralization mechanism. Environ Sci Pollut Res 28, 7332–7346 (2021). https://doi.org/10.1007/s11356-020-11057-8
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DOI: https://doi.org/10.1007/s11356-020-11057-8