RT journal article
T1 Mesophilic anaerobic co-digestion of two-phase olive-mill waste and cattle manure: Optimization of semi-continuous process
A1 Rubio Bernal, José Ángel
A1 Fernández Güelfo, Luis Alberto
A1 Romero García, Luis Isidoro
A1 Wilkie, Ann C.
A1 García Morales, José Luis
A2 Ingeniería Química y Tecnología de Alimentos
A2 Tecnologías del Medio Ambiente
K1 Anaerobic co-digestion
K1 Semi-continuous operation
K1 Methane yield
K1 Two-phase olive-mill waste
K1 Cattle manure
AB Anaerobic co-digestion of organic wastes is an effective technology for the management of two or more substrates with different characteristics. In this context, the main objective of this work was the optimization of biogas production for the treatment of a mixture of two-phase olive-mill waste (2POMW) and cattle manure (CM) (60:40 w/w) at mesophilic temperature range (35 degrees C). The effect of hydraulic retention time (HRT) on the performance and stability of the digestion process was studied. A decreasing series of HRTs in the range of 40-12 days was analyzed. The corresponding organic loading rates (OLR) were in the range 2.01-6.07 gVS/L(R)middotd. Pseudo steady-state operation of the reactor was established for HRTs between 40 and 15 days. For 15-days HRT, the maximum values of methane productivity (0.94 LCH4/L(R)middotd) and specific methane yield (0.52 LCH4/gVS(removed)) were obtained while total acidity (measured as acetic acid) in the effluent were < 150 mg/L, verifying process stability. In addition, the removal efficiencies of volatile solids (VS) and dissolved organic carbon (DOC) were 38 and 67 %, respectively. At 12-days HRT, decreases in methane production and organic matter removal efficiencies were observed, with values of 27 and 47 % for VS and DOC removal, respectively. Therefore, 12-days HRT was considered as inadequate for the anaerobic co-digestion of 2POMW and CM because a clear increase in volatile fatty acids was observed at the end of this period, leading to process destabilization and a decrease in biogas production.
PB ELSEVIER
SN 0016-2361
YR 2022
FD 2022-11
LK http://hdl.handle.net/10498/27448
UL http://hdl.handle.net/10498/27448
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026