A VFA-based controller for anaerobic digestion of industrial winery wastewater

Gustavo Vargas-Morales, ROLANDO ARTURO CHAMY MAGGI, Santiago García-Gen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1871-1878
Number of pages8
JournalWater Science and Technology
Volume78
Issue number9
DOIs
StatePublished - 19 Dec 2018

Keywords

  • Anaerobic digestion
  • Biogas
  • Control
  • VFA
  • Wine wastewater

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