Hydrogen Production by Wastewater Alkaline Electro-Oxidation

Laura Pérez Orosa, Eva Chinarro, Domingo Guinea and María C. García-Alegre ()
Additional contact information
Laura Pérez Orosa: Centre for Automation and Robotics (CAR), Spanish National Research Council (CSIC), Carretera, Campo Real Km 0.2, 28500 Arganda del Rey, Spain
Eva Chinarro: Ceramic and Glass Institute (ICV), Spanish National Research Council (CSIC), Kelsen 5, 28049 Madrid, Spain
Domingo Guinea: Centre for Automation and Robotics (CAR), Spanish National Research Council (CSIC), Carretera, Campo Real Km 0.2, 28500 Arganda del Rey, Spain
María C. García-Alegre: Centre for Automation and Robotics (CAR), Spanish National Research Council (CSIC), Carretera, Campo Real Km 0.2, 28500 Arganda del Rey, Spain

Energies, 2022, vol. 15, issue 16, 1-19

Abstract: The current work presents the electro-oxidation of olive mill and biodiesel wastewaters in an alkaline medium with the aim of hydrogen production and simultaneous reduction in the organic pollution content. The process is performed, at laboratory scale, in an own-design single cavity electrolyzer with graphite electrodes and no membrane. The system and the procedures to generate hydrogen under ambient conditions are described. The gas flow generated is analyzed through gas chromatography. The wastewater balance in the liquid electrolyte shows a reduction in the chemical oxygen demand (COD) pointing to a decrease in the organic content. The experimental results confirm the production of hydrogen with different purity levels and the simultaneous reduction in organic contaminants. This wastewater treatment appears as a feasible process to obtain hydrogen at ambient conditions powered with renewable energy sources, resulting in a more competitive hydrogen cost.

Keywords: hydrogen production; single cavity electrolyzer; alkaline electrolysis; wastewater; electro-oxidation; hydrogen economy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/16/5888/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/16/5888/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:16:p:5888-:d:887645

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().