A research team led by Kim Su Gil, a researcher at the Nano Physics Engineering Institute, has investigated time-dependent deposition of ozone at different depths in bulk grains.
Treatment of grains by ozone gas can remove bacteria, pests and contaminants from bulk grains. In addition, it causes no secondary contamination due to the self-dissolution of ozone after treatment.
Because of good post-treatment results, ozone treatment is considered to be a very effective and eco-friendly method for improving grain quality.
For better understanding of ozone penetration in treatment of bulk grains by ozone gas, they investigated time-dependent deposition of ozone at different flowing velocities and depths in bulk grains.
They proposed a model of deposition in bulk grains by applying a material balance of ozone in a column of stored grains. The deposition model shows flow rate of ozone gas, porosity of bulk grains and pore shape factor.
The deposition model was applied to determine the time-dependent deposition velocities of ozone at different depths from measured values of ozone concentrations in columns of wheat grains. Then, penetration of ozone into columns of wheat grains was evaluated by analysing deposition velocities.
The deposition model makes it possible to estimate the ozone deposition on bulk grains in the treatment of different kinds of stored grains by ozone gas, and to design ozone treatment processes.
© 2021 KumChaek University of Technology