TY - JOUR
T1 - Effect of Storage Time on the Physicochemical Properties of Waste Fish Oils and Used Cooking Vegetable Oils
AU - Bruun, Nina
AU - Tesfaye, Fiseha
AU - Hemming, Jarl
AU - Dirbeba, Meheretu
AU - Hupa, Leena
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Waste fish oils (FOs) and used cooking vegetable oils (UCOs) are increasingly becoming alterna-tive renewable fuels. However, different physicochemical aspects of these renewable fuels, in-cluding the effect of storage, are not well-known. In this work, the effect of the storage period on physicochemical properties of selected samples of FOs and UCOs was investigated. The bio-oils were stored at 4 °C for up to five years before each experimentation. The chemical properties were characterized using capillary gas chromatography with flame ionization detection (GC-FID) and high-performance size exclusion chromatography including an evaporative light scattering de-tector (HPSEC-ELSD). Water contents and acid numbers of the bio-oils were determined using the Karl Fischer (KF) titration and the ASTM D 664 methods. Furthermore, the average heating values and surface tension of the bio-oils were determined. According to the results obtained, for all bio-oil types, the concentrations of polymerized triglycerides, diglycerides, and fatty acids and monoglycerides had increased during the storage periods. The physical properties of the bio-oils also showed a small variation as a function of the storage period. The overall results observed indicate that the deterioration of the physicochemical properties of bio-oils can be controlled through storage in dark, dry, and cold conditions.
AB - Waste fish oils (FOs) and used cooking vegetable oils (UCOs) are increasingly becoming alterna-tive renewable fuels. However, different physicochemical aspects of these renewable fuels, in-cluding the effect of storage, are not well-known. In this work, the effect of the storage period on physicochemical properties of selected samples of FOs and UCOs was investigated. The bio-oils were stored at 4 °C for up to five years before each experimentation. The chemical properties were characterized using capillary gas chromatography with flame ionization detection (GC-FID) and high-performance size exclusion chromatography including an evaporative light scattering de-tector (HPSEC-ELSD). Water contents and acid numbers of the bio-oils were determined using the Karl Fischer (KF) titration and the ASTM D 664 methods. Furthermore, the average heating values and surface tension of the bio-oils were determined. According to the results obtained, for all bio-oil types, the concentrations of polymerized triglycerides, diglycerides, and fatty acids and monoglycerides had increased during the storage periods. The physical properties of the bio-oils also showed a small variation as a function of the storage period. The overall results observed indicate that the deterioration of the physicochemical properties of bio-oils can be controlled through storage in dark, dry, and cold conditions.
KW - free fatty acid
KW - bio-oil
KW - fuel aging
KW - renewable energy sources
UR - https://www.mdpi.com/1996-1073/14/1/101
U2 - 10.3390/en14010101
DO - 10.3390/en14010101
M3 - Article
SN - 1996-1073
VL - 14
SP - 1
EP - 14
JO - Energies
JF - Energies
IS - 1
M1 - 101
ER -