Environmentally friendly technologies to maintain stored paddy rice quality

  • F. A. Lazzari Department of Zoology, Universidade Federal do Paraná, Caixa Postal 19020. 81531-980 Curitiba, Paraná, Brazil. Email: flaviolazzari@gmail.com
  • S. M. N. Lazzari Department of Zoology, Universidade Federal do Paraná, Caixa Postal 19020. 81531-980 Curitiba, Paraná, Brazil
  • F. N. Lazzari Department of Zoology, Universidade Federal do Paraná, Caixa Postal 19020. 81531-980 Curitiba, Paraná, Brazil

Abstract

Exports of processed rice have been increasing every year, as well as legislative restrictions and consumer demand for certified chemical free rice, pressing the rice processing industry to new challenges. The objective of this work was the implementation of a Rice Quality Certification Program. The package includes the association of a rigorous sanitation program and safe environmentally friendly control measures. It was accomplished in a large paddy rice facility with 40 silos during the 2008/09 rice crop. Silo sanitation was done by washing with pressurized water the conveyor belt structure above the silo roof, around the externals walls and thorough aspiration of the aeration system. During silo filling, the lower and top portions of the rice grain were treated with a mixture of diatomaceous earth (DE) and powder deltamethrin. Artificial chilling was applied as soon as the top layer of the grain mass was leveled by insufflating cool air (6 to 8ºC) with a large cooling machine through the aeration system. The grain mass temperature stabilized at about 12-14ºC, and kept this range of temperature for about 60 d. As the temperature of the grain mass increased, mainly on the top layer, aeration was performed with natural air from the cold fronts during the winter months. After 8 months on storage the rice was free of external insects, as proved by the grain sampling just before processing. For the 2009/10 crop season, the rice quality program will be repeated on 60 silos with few adjustments.

Keywords: Chilled aeration, Inert dust, Physical insect control, Rice quality maintenance.
Veröffentlicht
2010-09-02