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Combining Electrocatalysts and Biobased Adsorbents for Sustainable Denitrification

preprint
submitted on 08.10.2020 and posted on 08.10.2020 by Zili Ma, Matthias Klimpel, Serhiy Budnyk, Anna Rokicińska, Piotr Kustrowski, Richard Dronskowski, Aji Mathew, Tetyana Budnyak, Adam Slabon

Efficient treatment of domestic and industrial wastewater is one of the major challenges of the 21st century. Among the inorganic pollutants, nitrogen species are significant contaminants and the management of the nitrogen cycle is one the most crucial part of wastewater purification. Herein, we report an integrated method that minimizes the amount of used chemicals, can be empowered by renewable energy, uses renewables materials for ammonia recovery and is scalable. Complete denitrification of wastewater was achieved by combining electrochemical and adsorption treatment for real wastewater samples from the Stockholm water pilot plant. 98% of nitrate was selectively converted to ammonia over abundant copper electrocatalysts in Na2SO4 supporting electrolyte at –0.6 V vs. RHE within three hours. The valorized nitrate in form of ammonia could be recovered by means of cheap Kraft Lignin-SiO2 sorbents to achieve a total denitrification. The presented method is economically feasible, scalable and contributes to sustainable recycling within a circular economy.

Funding

Swedish Foundation for Strategic Environmental Research (Mistra: project Mistra SafeChem, project number 2018/11)

ERASMUS+ student scholarship for Matthias Klimpel

History

Email Address of Submitting Author

adam.slabon@mmk.su.se

Institution

Stockholm University

Country

Sweden

ORCID For Submitting Author

0000-0002-4452-1831

Declaration of Conflict of Interest

no conflict of interest to declare

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