Host: Japan Society of Material Cycles and Waste Management
We surveyed discarded PET bottles with leftover contents at J. F. Oberlin University. Leftovers of beverage occur intentionally or unintentionally, and 10g or more leftover is considered intentional. 23% of discarded PET bottles contain leftovers, 8% of discarded PET bottles contain 50g or more leftover. Fruit beverages have a high percentage of intentional leftover compared with water or tea. The average quantity of leftover in 500mL PET bottles with leftover contents is 55.9g/bottle and the average quantity of leftover in all discarded 500mL PET bottles is 12.8g/bottle, which corresponds to 47% of average vacant PET bottle weight. 27% students have an experience to discard PET bottles with leftover contents. Students who never condider if he/she can drink all have high experience rate. The reasons of leftover (multiple answer) are “Because I am full” is 56%, “Because it’s too much to carry” is 41%.
