REACTION KINETICS OF OZONE GAS IN PADDY GRAINS

摘要

The present study was carried out to evaluate the effect of ozone on paddy grainsrnin an airtight acrylic bin with the following three aspects: saturation time, decompositionrnkinetics and half-life of ozone. Experiments were performed in differentrnbed thickness (5 and 10 cm) and moisture content (11.2 and 14.3% w.b.) at atmosphericrncondition. The lowest saturation time of ozone was 71 min with concentrationrnof 773 ppm for paddy grains ozonated at 5 cm bed thickness with 11.2%rn(w.b.) moisture content. The decomposition kinetics obtained was first-orderrnmodel. As regard the half-life of ozone, the lowest value obtained was 6.32 min forrnpaddy grains ozonated at 10 cm bed thickness with moisture content of 14.3%rn(w.b.). In the process, half-life of ozone in paddy grains, bed thickness (P ≤ 0.01)rnand moisture content (P ≤ 0.01) were found to be the key factors.