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Open AccessArticle

Assessing Concentration Changes of Odorant Compounds in the Thermal-Mechanical Drying Phase of Sediment-Like Wastes from Olive Oil Extraction

1
Institute of Chemistry of Natural Resources, University of Talca, Box 747 Talca, Chile
2
School of Engineering, University of Talca. Merced 437, Curicó 3341717, Chile
3
GENOCOV Research Group. Department of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(3), 519; https://doi.org/10.3390/app9030519
Received: 27 December 2018 / Revised: 24 January 2019 / Accepted: 29 January 2019 / Published: 3 February 2019
(This article belongs to the Special Issue Air Pollution)
In the industrial production of olive oil, both solid wastes and those produced from their incineration are a serious environmental problem since only 20% w/w of the fruit becomes oil and the rest is waste, mainly orujo and alperujo. A key aspect to transforming these wastes into an important source of energy such as pellets is to recognize the most appropriate time of the year for waste drying, with the objective of minimizing the environmental impact of the volatile compounds contained in the waste. In this work, the emissions produced during thermal-mechanical drying were studied throughout a period of six months of waste storage in which alperujo and orujo were stored in open containers under uncontrolled environmental conditions. The studied emissions were produced when both wastes were dried in a pilot rotary drying trommel at 450 °C to reduce their initial humidity of around 70–80% w/w to 10–15% w/w. Results indicated that when the storage time of the wastes in the uncontrolled environments increased, the emission of odorant compounds during drying also increased as a consequence of the biological and chemical processes occurring in the containers. The main odorant VOCs were quantified monthly for six months at the outlet of the drying trommel. It was determined that the drying of this type of waste could be carried out properly until the third month of storage. Afterwards, the concentration of most VOCs produced widely exceeded the odor thresholds of selected compounds. View Full-Text
Keywords: agroindustrial waste; alperujo and orujo; rotary dryer emissions; volatile organic compounds; biomass drying agroindustrial waste; alperujo and orujo; rotary dryer emissions; volatile organic compounds; biomass drying
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MDPI and ACS Style

Hernández, D.; Quinteros-Lama, H.; Tenreiro, C.; Gabriel, D. Assessing Concentration Changes of Odorant Compounds in the Thermal-Mechanical Drying Phase of Sediment-Like Wastes from Olive Oil Extraction. Appl. Sci. 2019, 9, 519.

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