Improving photosynthetic biogas purification via process aeration and nanoparticle supplementation.

Raquel Lebrero, Raúl Muñoz, Edwin G Hoyos, Mihai L Lomanar, Saúl Blanco

Journal: Bioresource technology 2025;418():131987

PMID: 39675640

Full Text on Elsevier Science View on PubMed

Abstract

This study evaluated the influence of nanoparticles in both suspension and solid format on the performance of a microalgal process devoted to photosynthetic biogas purification. The experimental system consisted of an enclosed tubular photobioreactor coupled to a biogas absorption column through a mixing chamber. The high NH concentration in the inlet mineral medium (530 mg N-NH L) and the punctual addition of 115 mL of nanoparticle suspension to the system caused inhibition of the microalgal-bacterial cultivation. Conversely, cultivation broth aeration (0.5 L min air flowrate) allowed the biomethane production fulfilling the EN 16723 (CH > 90 %, CO < 2 %). The nanoparticle suspension performance was superior to that of their solid counterparts in terms of CO removal efficiency at equivalent nanoparticle dose (77 % vs. 49 %). However, parameters such as the nanoparticle suspension dosage and biomass concentration in the photobioreactor should be optimized to further improve biomethane quality before its industrial application.

Address: Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Department of Chemical and Environmental Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain.; Departamento de Biodiversidad y Gestión Ambiental, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain; Laboratorio de diatomología y calidad de aguas, Instituto de Investigación de Medio Ambiente, Recursos Naturales y Biodiversidad. La Serna 58, 24007 León, Spain.; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Department of Chemical and Environmental Engineering, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain. Electronic address: [email protected].

DOI: 10.1016/j.biortech.2024.131987

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MeSH Terms: Biofuels, Nanoparticles, Photosynthesis, Microalgae, Photobioreactors, Biomass, Methane, Carbon Dioxide