Journal of
Stored Products and Postharvest Research

  • Abbreviation: J. Stored Prod. Postharvest Res.
  • Language: English
  • ISSN: 2141-6567
  • DOI: 10.5897/JSPPR
  • Start Year: 2010
  • Published Articles: 147

Full Length Research Paper

Selection, characterization and identification of smokes from different biomass materials as a medium for modifying the atmosphere for stored grain

Yetenayet B. Tola
  • Yetenayet B. Tola
  • Department of Postharvest Management, College of Agriculture and Veterinary Medicine, Jimma University, P. O. Box 307, Ethiopia.
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Obsuman D. Muleta
  • Obsuman D. Muleta
  • Department of Postharvest Management, College of Agriculture and Veterinary Medicine, Jimma University, P. O. Box 307, Ethiopia.
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Werner C. Hofacker
  • Werner C. Hofacker
  • Institute of Applied Thermo and Fluid Dynamics, Konstanz University of Applied Sciences, D-78462 Konstanz, Germany.
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  •  Received: 18 August 2018
  •  Accepted: 08 November 2018
  •  Published: 31 December 2018

Abstract

In developing countries, losses of stored grains due to insect pests are significant. Modified atmosphere (MA) storage is one of the strategies to minimize impact of the pests. This work aimed to identify a biomass material for generating smoke having high concentrations of CO and CO2 to create a MA in stored grains. Smokes from seven biomass were characterized in terms of CO, CO2, NO and O2 composition. Results showed that smoke from dried maize stalk (MS) was superior in terms of generation of high concentrations of CO (>2% vol) and CO2 (>11% vol) with relatively less NO (< 70 ppm vol) but high rate of O2 (< 11% per volume) depletion. MS is also easily available in farms with no cost; its smoke imparts less smell and flavor on grains and critically avoids deforestation unlike use of other biomasses. Therefore, it could serve as a medium for modifying stored grain atmosphere through accumulation of high concentration CO and CO2. Furthermore, during infusion, it expels ambient air from interstellar space of grains to modify storage environment. An efficient smoke infusion device and hermetic storage structure are required to benefit from created MA against grain insect pests.

Key words: Carbon dioxide, carbon monoxide, modified atmosphere, smoke, storage pest.