Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Bioelectrochemical systems (BES) combine electrochemistry with the metabolism of electroactive microorganisms for energy production.
In Microbial Electrolysis Cells (MECs), electroactive bacteria grow building a biofilm on the surface of a conductive anode, which acts as electron acceptor. When these microorganisms oxidize organic matter to CO2 under anaerobic conditions, the electrons obtained in the process are transferred from the anode to the cathode through an electrical circuit [1]. The cathodic reaction is the H2 formation through H2O reduction under alkaline conditions along with the application of an external potential, which is required due to the non-spontaneous nature of this reaction.
Hydrogen is considered a clean energy source and an important candidate to replace fossil fuels in the near future. However, traditional hydrogen production is achieved through processes that are expensive and non-sustainable, as they require high amounts of energy, such us electrolysis and carbon gasification.
In this work, which is part of the Regenera Project (MISIONES 2019, CDTI) we present the BES-BioH2 system, a reactor based on a MEC system [2] with the purpose of obtaining biohydrogen with lower energy requirements using the energy produced by electroactive microorganisms and employing wastewater as a source of organic matter. Wastewater is considered a cheap and abundant energy source, as they contain high amounts of organic compounds. Different types of wastewaters such as urban wastewater and food industry wastewater (brewery) are tested to determine their potential for hydrogen production.
The main objective of this study is to determine the operational conditions for production of hydrogen with energy cost below 20 kWh/kg H2.
REGENERA project has been funded by the CDTI within the framework of the MISIONES 2019 program with the support of the Ministry of Science and Innovation (Funded by the European Union-NextGenerationEU).
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