| Author | Singhanat Phoungchandang |
| Call Number | AIT Thesis no. AE-86-22 |
| Subject(s) | Vegetable processing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A village level post-harvest handling system to help overcome the
problems of keeping and handling excess peas in the pea growing district
of Thailand is discussed in this study. The system includes the design,
construction and testing of a simple vining machine and an inclined shaker
for separation. Drying was proposed as a method to store the excess
production under village level. The drying characteristics of fresh peas
was tested under different pretreatments and drying temperatures.
The vining machine tests were conducted by varying the vining bar
speed and concave clearance from 160 to 200 rpm and 5 to 11 mm respectively. The best performance in terms of capacity, efficiency and minimum
damage was achieved at 200 rpm and concave clearance of 7 mm where the
vining capacity, efficiency and damage was 3.8 kg/hr, 99.3% and 1.9% respectively . The tests conducted on the inclination of the shaker from
15 to 25 degrees indicated best performance of 97% separation at 20 de - grees.
The vined peas were pretreated by different blanching methods prior
to drying in a single layer under three temperatures of 50°c, 60°c and
70°c. The drying data was fitted to an exponential drying model which
gave two empirical drying parameters namely the empirical drying constant
and empirical drying exponent. Quality evaluation by chlorophyll content, physical properties and sensory tests showed best quality for peas
pretreated by blanching with chemicals and dried at S0°c. |
| Year | 1986 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Illangantileke, Sarath G. |
| Examination Committee(s) | Jindal, Vinod Kumar ;Gupta, Chandra P. |
| Scholarship Donor(s) | The Government of Japan |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1986 |