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

oard and product prices in shop. The waste prices in a board do not change, and people can
exchange their wastes with products at the same rate every time. However, the prices of
products in the shop always change followed by the prices of products at sources.
Figure C-30 Waste costs board
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Figure C-31 Product prices in shop
This business is a profit business because the owner gains many profits from selling wastes,
waste-product exchange, selling cleaning solution, selling inventions, and buying wastes from
outside people. The most popular products in this shop are vegetable oil, rice, snacks, soda
drink, monosodium glutamate, shrimp paste, and pepper. The owner always gains profits from
selling wastes. For instance, she buys 15 Baht/kg of PET bottles, and she sells 18.50 Baht/kg
of PET bottles. She will get 3.50 Baht/kg of PET bottles. She also buys 15 Baht/kg of HDPE
bottles, and she can sell 20 Baht/kg of HDPE bottles.
She has one tactic to sell HDPE bottle by separation out of HDPE milk bottles and HDPE
water bottles. This tactic will help to make more profits than selling mixed HDPE wastes.
Furthermore, she buys 3 Baht/kg of cleaned milk/juice cartons, and she sells 5 Baht/kg of
those wastes to Green Board Ltd., Co. Therefore, she will get 2 Baht/kg of wastes as a profit,
and that company supports some roofs which are made from milk/juice cartons to this shop.
Residue wastes from a separation process are sold 1 Baht/kg of wastes to cement factory. She
also sells inventions to interesting people and outside people (cleaning solution are 20
Baht/750 mL). The owner usually sells wastes when she has large amounts of wastes and can
fulfill wastes into the light trucks. The average amounts of wastes which are sold each time are
shown in Table C-8.
Table C-8 Amounts of selling wastes
Types of wastes Weight (kg)
HDPE bottle 500-700
PET bottles 700-800
Glass 1,000/week
Paper 800-1,000
Cartonnes 700-800
Residue wastes 1,000-2,000/month