NTU Singapore scientists develop cleaner way to recycle mixed plastic packaging
Scientists from Nanyang Technological University, Singapore (NTU Singapore) have developed a new method to recycle mixed plastic packaging without using harmful chemical solvents – an approach that could make one of the world’s most difficult waste streams significantly easier to handle. The research team from NTU Singapore’s School of Materials Science and Engineering and Nanyang Environment and Water Research Institute (NEWRI) has introduced a process called depolymerisation-induced polymer separation, or DIPS. The method selectively breaks down one type of plastic in mixed plastic packaging while leaving the other plastics intact, allowing each material to be recovered and reused. Addressing a global recycling challenge Mixed plastic packaging, commonly used to wrap snacks, instant noodles and other food products, is designed to be tough and airtight. The packaging is made up of several different plastics bonded tightly together, making it challenging to recycle. Even if recycled, the material is often of low quality and has little commercial value. As a result, most multilayer packaging ends up in landfills or incinerators, adding to a fast-growing waste burden. Global plastic production is projected to reach 736 million tonnes[1] by 2040. Lead investigator Professor Hu Xiao, who is also the Programme Director for Sustainable Chemistry and Materials at NEWRI, said: “We’re seeing more mixed plastic packaging used in everyday food products, but recycling it safely and efficiently is still a major challenge. Our team set out to tackle this by developing a practical, scalable way to separate these materials without using harmful solvents.” Study co-author Dr Liang Yen Nan, who is also Senior Research Fellow, NEWRI, said: “One of the biggest hurdles in plastic recycling today is the lack of a viable way to deal with mixed plastics. This project was driven by that challenge, and our goal is to help move the industry closer to a solution that works in the real world.” A […]
