Japan has reported a high recycling rate of 84.5% for PET bottles in 2017. However, out of the total bottles collected, approximately 15 wt% consist of non-recyclable PET bottles. Here, non-recyclable PET bottles are referred to materials consisting of colored pigment, materials with impurities such as oil on surface and materials exposed to long-term UV-degradation. Due to the zero-recycling value of non-recyclable PET bottles, it is difficult to purify and recycle these materials. As a result, non-recyclable PET bottles are still being processed through thermal treatment. Thermal treatment of plastic materials is the least desired approach in waste management due to environmental and health concerns involving the emission of toxic PAH and greenhouse gases during the incineration of plastic wastes. Incentives should be taken to decrease the dependency on thermal treatment for non-recyclable PET bottles through improvement of processing routes of PET bottle recycling.
The aim of this research is to provide an alternative route to improve the material value of non-recyclable PET bottles for the enhancement of the PET bottle recycling cycle. In particular, we plan to treat the non-recyclable PET bottles into char through carbonization, followed by activation of the carbonized product into activated carbon. Current experiments were conducted using commercial PET bottles as model feedstock to give a better understanding on the factors in the carbonization of PET using a bench-scaled batch reactor to obtain high char yield. Studies include the effects of operating temperature and reaction time on char, wax and gas yield.
Chiaweefern Jennifer, University of Tokyo, Japan
Sawai Osamu, University of Tokyo, Japan
Nunoura Teppei, University of Tokyo, Japan
Stream: Consumption, Production & Waste
This paper is part of the IICSEEHawaii2020 Conference Proceedings (View)
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