Evaluation of Plastic Waste Management in Thailand Using Material ...

2. Objectives of field observation at Sai Mai transfer station
To find the percentage of plastic wastes in municipal solid wastes
To identify the types of plastics in municipal solid wastes
3. Procedures of sample collection
The random sampling method is use to collect waste samples base on the American
Society for Testing and Materials (ASTM). First, random spot are chosen and separated
from the original waste using a shovel as shown in Figure C-44. Secondly, mix the pile of
separated waste to get a heterogeneous sample than divide the waste into four different
piles of waste as shown in Figure C-45. From the four different piles, 2 of it are eliminated
while the other 2 are used for sample analysis as shown in Figure C-46. This is to ensure
homogenous collection of waste. The wastes from each pile are then segregated according
to the type of waste. After segregation, each type of wastes is measured with a weighing
machine. Only plastic samples are separated into each type of plastics.
Figure C-44 Choosing the sampling point Figure C-45 Four different blocks of
wastes
Pile of waste
1
Left 2 pile for
sampling
4
Split
Figure C-46 Sample collecting process
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1
1 2
3 4
4