| 英文摘要 |
In 2023, the National Environmental Research Academy formulated the Blueprint for the Development of Resource Circulation and Net Zero Emission Technologies. The plan focuses on 4+3 circular projects from short-term development recommendations, drafting verification mechanisms for resource circulation and carbon reduction benefits for these projects. Based on international technological development trends and research initiatives, the short-term priorities include developing scientific testing technologies for recycled materials from batteries, thermoplastic plastics, incineration fly ash, and digital flow tracking management systems for strategic projects, as well as conducting baseline studies on the environmental safety of using recycled incineration fly ash in construction materials. In the medium term, efforts should focus on advancing scientific testing technologies for recycled materials, such as thermoplastic plastics and textiles. For long-term research and development, strategic projects that are not yet commercially viable—such as recycled fiberglass, recycled carbon fiber, and the reuse of fluorinated calcium sludge—are identified as key priorities.
This projects collected 34 samples of virgin or recycled PET resins from the top three domestic polyester pellet manufacturers with different applications. Relevant characteristics were established using the BSI Flex 6228 method. The results showed that the BSI Flex 6228 method achieved an accuracy rate of 76% for 17 virgin resins (excluding non-container resins) and 100% for one virgin PET bottle. Meanwhile, the accuracy for 8 recycled resins was 100%, but the accuracy for 2 recycled PET bottles was 0%. We also developed an innovative approach using a differential scanning calorimeter (DSC) spectrum for further analysis. This method uses the crystallization temperature and the presence or absence of an α peak in the second heating stage to conduct qualitative analysis, improving the misclassification issues found when using the BSI Flex 6228 method (including for certain virgin resins and recycled PET bottles). The new method increases the accuracy rate for virgin resins and recycled PET bottles to 100%.
Additionally, the domestic high-temperature incineration furnace and low-background liquid scintillation counter have been established. Based on the detection results of standard and SRF samples in this project, the recommended method has an accuracy of 30% absolute error and a precision of 20% standard deviation. The biomass carbon ratio detection method developed in this project can be applied to resource-recycling fuels. However, further validation is needed if the method is to be extended to liquid fuels or chemicals with different sample matrices.
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