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Tipo de publicación: Artículos científicos (Publicados en revistas de divulgación o científicas)

Título del artículo: Improving the anaerobic digestion of sewage sludge by adding cobalt nanoparticles

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Año de publicación: 2024

Resumen: This work evaluated the effects of cobalt nanoparticles (CoNPs) (0.025–7?mg/gVS) on the intensification of sewage sludge anaerobic digestion (AD) using biochemical methane potential (BMP) tests. This study was motivated by the need to improve the efficiency and stability of anaerobic digestion of sewage sludge, a critical process in waste management and renewable energy production. The effects at doses less than 2?mg/gVS were not substantial, but 3–7?mg/gVS improved the performance. The maximum biogas yield was 232?mL/gVS (at a dose of 7?mg/gVS), whereas it was 132?mL/gVS in the control (zero dose). Similarly, the reductions in the volatile solids and methane contents reached maxima of 16 and 74.3%, respectively. The analyses of volatile fatty acids, redox potential, and electron transfer system activity indicated that the addition of CoNPs stimulated the early stages of AD. Finally, acetate consumption and the increase in CH4 content suggested that CoNPs positively affected system stability and acetoclastic methanogenesis. That is, CoNPs effectively intensified the behaviour and stability of the anaerobic process. The novelty of this research lies in the comprehensive evaluation of the effects of CoNPs across a wide range of doses on sewage sludge AD, providing new insights into the optimisation of this process for increased biogas production and organic matter reduction.

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Autor(es): Alfredo Córdova Lizama, Cristian Carrera Figueiras, Alejandro Zepeda Pedreguera, Noori M. Cata Saady & Juan Enrique Ruiz Espinoza.

Campo: Tratamiento biológico de lodos residuales

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