| Author | Mohamed, El-Kholy |
| Call Number | AIT Thesis no.AE-91-02 |
| Subject(s) | Paddy--Storage
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | A study was carried out to evaluate the effectiveness of
aeration methods on maintaining the quality of freshly harvested
paddy during short term storage. Two different aeration methods
were evaluated under two type of air (natural and refrigerated
air), two levels of grain initial moisture content (21-22 and
25-26%), and three air flow rates, 0.02, 0.04 and 0.06
m3/hr.kg. The effect of short-term exposure to adverse condition
such as when aeration is delayed was also investigated.
Seven lots of high moisture rough paddy were stored for 10
days each experiment. Three lots aerated with natural air, the
other three lots were aerated with refrigerated air. One
treatment was l eft without aeration as control treatment. The
effect of aeration methods on grain quality was evaluated in
terms of grain final moisture content, milling quality, fungal
growth, grain discoloration and whiteness degree.
In refrigerated aeration, the cold and dry air reduced the
grain moisture content to a range of 14 to 17% (w.b) in
comparison with 17 to 20% in natural aeration. The range of air
temperature and relative humidity was 17.5- 22.7°C and 42-51% in
refrigerated aeration in comparison with 32-35°C and 73-8090 in
natural aeration. Lower air temperature and relative humidity in
refrigerated aeration reduced the grain moisture content and
temperature to a level prevented spoilage of high moisture rough
rice in comparison with ambient air. Mold growth associated with
gr a in discoloration has increased as long as the grain
temperature and/or moisture content remained high. Paddy with 21
percent initial moisture content had a relatively little quality
changes in comparison with the 25 percent. Higher air flow rate
would reduce the drying time and possibly mold activity and other
quality changes during storage.
Delays in starting aeration has increased mold growth and
amount of deterioration especially in the treatments delayed for
two days. However the risk of quality changes during and after
delay in s tarting aeration could be reduced by faster reduction
of grain temperature and moisture content using refrigerated air. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Ilangantileke, S.G.; |
| Examination Committee(s) | Jindal, Vinod Kumar;Athapol Noomhorm; |
| Scholarship Donor(s) | Japan International Cooperation Agency (JICA); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1991 |