Anaerobic digestion of tuna waste for the production of volatile fatty acids. (October 2017)

• Record Type: Journal Article
• Authors: Bermúdez-Penabad, Noela; Kennes, Christian; Veiga, Maria C.
• Is Part Of: Waste management. Volume 68(2017)
• Page Start: 96
• Page End: 102
• Publication Date: 2017-10
• Subjects: Anaerobic digestion -- Tuna waste -- Volatile fatty acids (VFA) -- Hydrolysis; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2017.06.010
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Tuna waste was used as a feedstock for volatile fatty acid (VFA) production. Higher VFA production was obtained at alkaline pHs. Acetic acid was the most abundant VFA. Abstract: Fish canning industries generate a significant amount of solid waste that can be digested anaerobically into volatile fatty acids (VFA). The aim of this research was to study the effect of various pHs, ranging from 5.0 to 10.0, and percentage of total solids on the anaerobic digestion of tuna waste into VFA, both in batch assays and continuous reactor. The production of VFA was affected by pH and was significantly higher under alkaline conditions. At pH 8.0, the VFA production reached 30, 611 mg COD/L. The VFA mainly consisted of acetic, propionic, n -butyric and i -valeric acids. Acetic acid was the main product at all the pHs tested. In terms of total solids (TS) the best results were obtained with 2.5% total solids, reaching 0.73 g CODVFA /g CODwaste . At higher TS concentrations (5 and 8% TS) lower yields were reached probably due to inhibition at high VFA concentration.