Hybrid System for Green Hydrogen Production Using Microbial Electrolysis and Desalination Cells Coupled With Solar-Powered Glycerol Steam Reforming

Silva, Jhoni Anderson Schembek, Carvalho, Maria Clara Ribeiro, Carneiro, Emanulle Lima, de Sousa, Thaissa Lorrany Alves, Rocha, Paulo Alexandre Costa, Lobo, Fernanda Leite, Bueno, Andre Valente

ISES Solar World Congress 2025 · Fortaleza, Brazil · 2025-11-03
Published by International Solar Energy Society (ISES)
DOI: 10.18086/swc.2025.01.10

Abstract

This methodological design paper proposes a hybrid and sustainable system for green hydrogen production, integrating microbial electrolysis cells (MECs) for electrochemical conversion of organic matter from domestic sewage and industrial effluents into hydrogen, alongside a glycerol steam reforming module thermally activated by a parabolic solar concentrator. The system leverages electroactive bacteria in MECs and utilizes bonechar as a catalyst and microbial support, promoting cost reduction and circular economy principles. Treated residual water from the MEC is recirculated into the steam reforming process, closing a resource loop. Drawing on abundant local resources such as organic wastes and high solar insolation, particularly in Brazil's semi-arid Northeast, the design addresses sanitation deficiencies and energy challenges. Key performance parameters, including current density, coulombic efficiency, COD removal, and gas composition (H₂, CO₂, CH₄, CO), will be evaluated through theoretical modeling and planned experiments. This innovative approach maximizes energy efficiency and sustainability, aligning with global low-carbon transition goals. Preliminary thermodynamic simulations estimate hydrogen yields of up to 7 mol H₂ per mol glycerol under optimal solar conditions.

Keywords

Green hydrogen, Microbial electrolysis cells (MECs), Glycerol steam reforming, Concentrated solar energy, Bonechar, Effluent treatment, Circular economy

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