Acid-mediated hydrothermal treatment of sewage sludge for nutrient recovery
EntityUAM. Departamento de Ingeniería Química
10.1016/j.scitotenv.2022.156494Science of the Total Environment 838.4 (2022): 156494
ISSN0048-9697 (print); 1879-1026 (electronic)
Funded byThe authors greatly appreciate funding from the Spanish MICINN (Project PID2019-108445RB-I00; PDC2021-120755-I00), Madrid Regional Government (Project S2018/EMT-4344), and US National Science Foundation (NSF #CBET-1856009). A. Sarrion wishes to thank the Spanish MICINN and ESF for a research grant (BES-2017-081515)
ProjectGobierno de España. PID2019-108445RB-I00; Gobierno de España. PDC2021-120755-I00
SubjectsBiofuel; Biomass treatment; Hydrothermal carbonization; Nutrients and energy recovery; Waste-activated sludge; Química
Rights© 2022 The Authors
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Hydrothermal carbonization allows material valorization and energy recovery from wet biomass waste. In this study, the hydrothermal treatment of dewatered waste-activated sludge (DWAS) was evaluated at several temperatures (170–230 °C) and reaction times (5–60 min) in an acid-free medium or in media such as citric acid or HCl (0.1–0.5 mol/L). Compared with the DWAS, an increase in the fixed carbon content (>45 wt%) and heating value (18.9–22.9 MJ/kg) was observed in the hydrochar; however, their ash content remained high, which is the main drawback hindering their direct use as a biofuel. The addition of acids during hydrothermal treatment favored the solubilization of N and P in the process water, which required strict control of the reaction time to avoid the recrystallization of P in the hydrochar. Under optimum operating conditions (230 °C, 15 min, 0.5 mol/L HCl), 94 % of P (as of PO4) and almost 100 % of N (14 % as NH4-N) present in the feedstock were concentrated in the process water
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Google Scholar:Sarrión Pérez, Andrés - Rubia Romero, María de los Ángeles de la - Coronella, Charles - Mohedano, Angel F. - Díaz Nieto, Elena
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