Plastic Recycling of Polyethylene Terephthalate (PET) and Polyhydroxybutyrate (PHB)—a Comprehensive Review

As an integral part of plastic waste, large amounts of polyethylene terephthalate (PET), polyhydroxybutyrate (PHB), and solid waste have led to serious environmental problems. In order to identify critical barriers to the reuse of plastic across a wide range of plastic values all over the world, we need to go through PET and PHB in terms of volume. This is a significant factor for the world and our global warming. The current uses of plastic through PET and PHB are significant. Through the recycling process of PET and PHB, the total volume of plastic uses will be decreased and reuse rate will be high by economic, social, and environmental factors. Key areas are identified by low demand due to price considerations, insufficient tracking and transparency of pricing transactions, and lack of common design. Integration of value chains is considered to be the most important intervention for respondents, following the need for increased investment and technology development. Recycling helps the environment and creates new economic opportunities. Reuse of plastics encourages businesses to develop new and innovative products. Recycling reduces through extraction (mining, quarrying, and logging), refining, and processing of raw materials which create significant air and water pollution. As renewable energy saving also reduces greenhouse gas emissions, which help to cope with climate change. This paper aims to raise awareness that increase the demand of recycling process of PET and PHB and to identify critical barriers of recycling throughout a series of plastic prices with the volume.