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oai:uvadoc.uva.es:10324/843202026-04-28T19:01:58Zcom_10324_35294com_10324_952com_10324_894col_10324_35295

Anagnostopoulou, Chrysa Vargas Estrada, Laura Gabriela Espinoza Jarrin, Johana Kougias, Panagiotis G. Muñoz Torre, Raúl 2026-04-28T08:21:16Z 2026-04-28T08:21:16Z 2026 Journal of Environmental Management, 2026, vol. 405, p. 129752 0301-4797 https://uvadoc.uva.es/handle/10324/84320 10.1016/j.jenvman.2026.129752 129752 Journal of Environmental Management 405 Producción Científica Photosynthetic biogas upgrading offers a sustainable approach for CO2 valorization from biogas, enabling the production of pure biomethane alongside high-value microalgal compounds. In this study, the combined effect of carbon-coated zero-valent iron nanoparticle supplementation and liquid-to-biogas ratio modification for biomethane enrichment and phycocyanin co-production was investigated in a high-rate algal pond cultivating Arthrospira platensis, interconnected to a bubble column treating raw biogas. Results revealed that the addition of nanoparticles stimulated photosynthetic activity, promoted biomass growth up to 3.8 g VSS·L−1, and significantly enhanced phycocyanin accumulation, stabilizing close to 30.0 mg·g−1dry biomass following the reduction of liquid-to-gas ratio. Concurrently, CO2 removal efficiencies remained above 96% across all stages, while CH4 content exceeded 96.5%, with maximum values above 98%, fulfilling European biomethane quality standards for grid injection. These findings highlight that carbon-coated iron nanoparticles represent a promising strategy for simultaneously improving biomethane quality and high-value pigment recovery in photosynthetic biogas upgrading systems, advancing the concept of an algal biorefinery within a circular bioeconomy framework. Junta de Castilla y León (Consejería de Educación) y cofinanciado por la Unión Europea a través del Fondo Europeo de Desarrollo Regional (FEDER) (Referencia: CLU-2025-2-06) application/pdf eng Elsevier info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2026 The Author(s) Atribución 4.0 Internacional Arthrospira platensis Nanoparticles 3308 Ingeniería y Tecnología del Medio Ambiente Nanoparticle-assisted photosynthetic biogas upgrading and phycocyanin co-production with Arthrospira platensis info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.sciencedirect.com/science/article/pii/S0301479726012120 SI