RT journal article
T1 Potential biomethane productivity in the temperature phased anaerobic  digestion process: Impact of organic load rate and solid retention time of  acidogenic phase
A1 Díaz Domínguez, Encarnación
A1 Ibáñez López, María Eugenia
A1 Pérez García, Montserrat
A1 Fernández-Morales, Francisco Jesús
A1 García Morales, José Luis
A2 Tecnologías del Medio Ambiente
K1 Hydraulic retention time
K1 Sludge age and biodegradability
AB This study evaluated the biochemical methanogenic potential (BMP) of effluents from a thermophilic acidogenic anaerobic membrane bioreactor (AMBR) operated semi-continuously at different hydraulic retention times (HRT) and solids retention times (SRT). Thus, the influence of organic loading rate (OLR) and sludge age on mesophilic methane production was evaluated. In addition, two kinetic models (Gompertz and Cone) were proposed as tools for modelling methane production.An 18.7 % increase in OLR (from 4.48 to 5.32 gVS/L·d) in the acidogenic reactor results in a 9.4 % increase in effluent biodegradability, which enhances the methanogenic phase and increases methane production by 23.9 % in volume (from 271.05 to 335.84 mL CH4) and 42.8 % in yield (from 127.85 to 182.52 mL CH4/gVSadded).For an OLR of 4.48 gVS/L·d, extending the SRT from 6 to 12 days results in a 20.9 % increase in methane production volume (from 271.05 to 327.65 mL CH4) and a 14.9 % increase in yield (from 127.85 to 146.93 mL CH4/gVSadded). For an OLR of 5.32 gVS/L·d, extending the SRT from 4 to 8 days results in improved total solids (TS) and volatile solids (VS) removal, as well as a 20.9 % increase in methane production by volume (from 335.84 to 406.12 mL CH4). In both scenarios, extending the SRT leads to a longer lag time (λ) for methane production, with the Gompertz model fitting better than the Cone model.
PB Elsevier
SN 2666-8211
YR 2025
FD 2025-06-12
LK http://hdl.handle.net/10498/39300
UL http://hdl.handle.net/10498/39300
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 05-nov-2026