Determination of odorant compounds in the thermal-mechanical a drying phase of wastes from olive oil extraction

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P05I3   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.

D. Hernández1,2,3, H. Quinteros-Lama2, C. Tenreiro2 , D. Gabriel3

1Instituto de Química de los Recursos Naturales, Universidad de Talca, Box 747, Talca, Chile
2Facultad de Ingeniería, Universidad de Talca. Merced 437, 3341717, Curicó, Chile
3GENOCOV Grupo de investigación. Departamento de Ingeniería Química, Biológica y Ambiental, Universidad autónoma de Barcelona, 08193, Bellaterra, España.

   Competing interests: The author has declared that no competing interests exist.

   Academic editor: Carlos N Díaz.

   Content quality: This paper has been peer reviewed by at least two reviewers. See scientific committee here

   Citation: D. Hernández, H. Quinteros-Lama, C. Tenreiro and D. Gabriel, 2019, Determination of odorant compounds in the thermal-mechanical a drying phase of wastes from olive oil extraction, OLORES19 Conference, Santiago, Chile, www.olores.org.

   Copyright: 2019 Olores.org. Open Content Creative Commons license. It is allowed to download, reuse, reprint, modify, distribute, and/or copy articles in olores.org website, as long as the original authors and source are cited. No permission is required from the authors or the publishers.

   ISBN: pending

   Keyword: Agroindustrial waste; alperujo and orujo; rotary dryer emissions; volatile organic compounds; biomass drying


Abstract

  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 ºC 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.

 

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