BOOK OF ABSTRACTS 209 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Hall A Poster Session / NOM and Aquatic Systems P3.1 Use of Microbial Consortia to Mitigate Eutrophication in the San José Dam Robert Carrión-Loja1, Marcela Méndez Tovar1, Felipe Cházaro-Ruiz1, Rene Rangel-Mendez1, Aura Ontiveros-Valencia1* Instituto Potosino de Investigación Científica y Tecnológica A.C., División de Ciencias Ambientales, Camino a la Presa San José 2055, Lomas 4a Sección, C.P. 78216, San Luis Potosí, México robert.carrion@ipicyt.edu.ec, aura.ontiveros@ipicyt.edu.ec The development of sustainable materials for water treatment is essential to address the increasing impact of nutrient pollution in aquatic systems. This study evaluates carbonized agave bagasse fibers as a low-cost support material for microbial consortia and zero-valent iron nanoparticles (nZVI), within a circular economy framework. Carbon fibers were produced from agave bagasse and evaluated in untreated and acid-washed conditions. Physicochemical characterization using SEM–EDX revealed that acid washing reduced inorganic residues and enhanced surface properties, promoting better interaction with nZVI and microbial attachment. Batch experiments were conducted using synthetic water designed to replicate the characteristics of the San José reservoir. Systems including carbon fibers, nZVI, and microbial communities were compared to controls to assess their individual and combined effects. The transformation of nitrogen species (ammonium, nitrites, and nitrates) was monitored, showing distinct dynamics depending on system configuration. Results indicate that carbonized fibers act as an effective support for biofilm development and contribute to the stabilization and dispersion of nZVI. The combined system promotes synergistic interactions between adsorption, redox reactions, and biologically mediated processes, enhancing nitrogen transformation pathways. This work demonstrates the potential of agave-derived carbon materials as sustainable supports for integrated physicochemical and biological water treatment processes, providing a basis for future optimization and scale-up.
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