2026-04-30T05:08:25Zhttps://uvadoc.uva.es/oai/request

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 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. eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2026 The Author(s) Atribución 4.0 Internacional Nanoparticle-assisted photosynthetic biogas upgrading and phycocyanin co-production with Arthrospira platensis info:eu-repo/semantics/article