Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Effects of ionic and nano selenium in the biogas production yield of the anaerobic co-digestion of harvested microalgae and sewage sludge(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-06) Hernández González, José Isaac; Cervantes Avilés, Pabel Antonio; emimmayorquin; Cervantes Avilés, Pabel Antonio; Cuevas Rodríguez, Germán; Valenzuela Reyes, Edgardo Iván; School of Engineering and Sciences; Campus Ciudad de MéxicoThe aim of this work was to evaluate the most productive substrate ratio concentration of harvested microalgae (HM) and sewage sludge (SS) in the anaerobic co-digestion (AcoD), assessed through the biogas production yield, as well as find the most beneficial selenium (Se) form and concentration in the AcoD of the most productive HM/SS ratio concentration. Five reactors were filled with the following substrate ratio concentrations: 50HM/50SS, 30HM/70SS, 10HM/90SS, 70HM/30SS, and the control reactor (inoculum and distilled water). The AcoD of HM and SS was carried out in mesophilic conditions and biogas was measured through potential assays. Minimal decrease in COD was observed, but total solids (TS) decreased through the AcoD, giving as result the 70MA/30SS ratio concentration reactor with the most efficient features for biogas production yield. For the evaluation of effect of Se in the AcoD of HM and SS, ionic and nano Se was added to four reactors with 70HM/30SS ratio concentration. Two nano Se and two ionic Se concentrations were used: 0.05 mg/L and 0.5 mg/L. Results indicated that the reactor with low concentration (LC) nano Se and high concentration (HC) nano Se displayed a 4.8 % biogas production enhancement, the reactor with LC ionic Se was the highest biogas production enhancement with 43.9 %, and the reactor with HC ionic Se demonstrated a 39.5 % biogas production improvement. The higher results in biogas production yield enhancement in the reactors with ionic Se added are attributed to the retention of ionic Se in the biomass of the digestate and the provision of essential nutrients, facilitating the synthesis of key enzymes and coenzymes, the promotion of the activity of anaerobic microorganisms could be carried out. In comparison with the reactors with nano Se, where Se NPs were precipitated since the beginning of the AcoD and the effects of nano Se couldn´t be applied.