TY - JOUR
T1 - A VFA-based controller for anaerobic digestion of industrial winery wastewater
AU - Vargas-Morales, Gustavo
AU - Chamy, Rolando
AU - García-Gen, Santiago
N1 - Funding Information:
This work was supported in part by a grant from Pontificia Universidad Católica de Valparaíso and by the Chilean Ministry of Education, through the Fondecyt Postdoctoral grant (Project No. 3160696) to Dr Santiago García. The authors want to express their gratitude to Biodiversa SA.
PY - 2018/12/19
Y1 - 2018/12/19
N2 - A variable-gain controller for anaerobic digestion of industrial winery wastewater was examined. A control law using both volatile fatty acids (VFA) and CH 4 production rate as controlled variables and organic loading rate (OLR) as manipulated variable is defined. The process state is quantitatively estimated by an empirical function comparing VFA measurements against a setpoint value and then modified with a second empirical function that compares the CH 4 flow rate with a maximum capacity reference. Finally, it is adjusted with a third factor considering the actual hydraulic retention time. The variable-gain function determines the extent of the OLR change applied to the system. The controller was successfully validated in a 95 L upflow-anaerobic-sludge-blanket (UASB) reactor, treating industrial wine wastewater at OLR ranged between 2.0 and 39.2 g COD/L-d for 120 days at mesophilic conditions. Higher performance was achieved contrasted with a conventional strategy carried out in a parallel UASB unit.
AB - A variable-gain controller for anaerobic digestion of industrial winery wastewater was examined. A control law using both volatile fatty acids (VFA) and CH 4 production rate as controlled variables and organic loading rate (OLR) as manipulated variable is defined. The process state is quantitatively estimated by an empirical function comparing VFA measurements against a setpoint value and then modified with a second empirical function that compares the CH 4 flow rate with a maximum capacity reference. Finally, it is adjusted with a third factor considering the actual hydraulic retention time. The variable-gain function determines the extent of the OLR change applied to the system. The controller was successfully validated in a 95 L upflow-anaerobic-sludge-blanket (UASB) reactor, treating industrial wine wastewater at OLR ranged between 2.0 and 39.2 g COD/L-d for 120 days at mesophilic conditions. Higher performance was achieved contrasted with a conventional strategy carried out in a parallel UASB unit.
KW - Anaerobic digestion
KW - Biogas
KW - Control
KW - VFA
KW - Wine wastewater
UR - http://www.scopus.com/inward/record.url?scp=85058878147&partnerID=8YFLogxK
U2 - 10.2166/wst.2018.367
DO - 10.2166/wst.2018.367
M3 - Article
C2 - 30566091
AN - SCOPUS:85058878147
VL - 78
SP - 1871
EP - 1878
JO - Water Science and Technology
JF - Water Science and Technology
SN - 0273-1223
IS - 9
ER -