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Simultaneous Ammonia and Nitrate Electrochemical Removal Using Carbon Supported Electrodes

Bagheri Hariri, Mohiedin
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou159601940263796

Abstract Details

2020, Master of Science (MS), Ohio University, Chemical Engineering (Engineering and Technology).
The goal of this study is to introduce a new undivided cell capable of simultaneous removal of nitrate and ammonia from wastewater streams using CuNi-PtIr supported on carbon (CuNi-PtIr/C) catalysts. The Environmental Protection Agency (EPA) considers ammonia (NH3) and nitrate (NO3-) as a large-scale threat to environmental quality and human health, causing impaired air quality, surface water eutrophication, and other serious health problems. This project focuses on introducing new classes of CuNi-PtIr/C catalysts for efficiently simultaneous removal of ammonia and nitrate through a pulse electrolysis technique in an undivided flow cell system. A systematic study has been conducted to examine different compositions of PtIr/C and CuNi/C catalysts using electrochemical techniques, and it was found that 40% Cu9Ni/C and 60% Pt9Ir/C are the most efficient catalysts for the nitrate reduction and ammonia oxidation, respectively. The introduced process enables the reduction of nitrate and the direct oxidation of ammonia to nitrogen with the co-generation of hydrogen in alkaline media. The co-generated hydrogen can be used for further recovery of the energy. Using the introduced technique, in some cases, after a few hours of electrolysis, no nitrate was left at the end. The ammonia concentration decreased from 2000 ppm to below 100 ppm, with an average current density of about 30-50 mA/cm2 (depending on electrolysis condition and electrode properties). Using this undivided flow cell, we were successful in simultaneously removing nitrate and ammonia. The proposed undivided flow cell uses 65-90% less energy than the existing processes. Because of this advantage, this technique could be implemented for the nitrate/ammonia decontamination of multiple lakes, rivers, and ponds.
Valerie Young (Advisor)
Gerardine Botte (Advisor)
Natalie Kruse-Daniels (Committee Member)
Daniel Che (Committee Member)
Kevin Crist (Committee Member)
169 p.
Chemical Engineering; Chemistry; Environmental Engineering
Ammonia; Nitrate; Electrochemical; Electrolysis; Catalyst

Recommended Citations

Citations

  • Bagheri Hariri, M. (2020). Simultaneous Ammonia and Nitrate Electrochemical Removal Using Carbon Supported Electrodes [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou159601940263796

    APA Style (7th edition)

  • Bagheri Hariri, Mohiedin. Simultaneous Ammonia and Nitrate Electrochemical Removal Using Carbon Supported Electrodes. 2020. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou159601940263796.

    MLA Style (8th edition)

  • Bagheri Hariri, Mohiedin. "Simultaneous Ammonia and Nitrate Electrochemical Removal Using Carbon Supported Electrodes." Master's thesis, Ohio University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou159601940263796

    Chicago Manual of Style (17th edition)

ohiou159601940263796
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This open access ETD is published by Ohio University and OhioLINK.