| 摘要(英) |
This research surveys the application and recovery rate of recycling and refining process of gold element. The research investigated the recovered materials of gold, its production process, its waste, and its carbon footprint of the recycling and refining process. Data collected from each stage were quantified to compare before and after improvement to understand carbon emissions and its influence on our environment in manufacturing, usage, and waste. According
to the result of the inventory, this research also offered some suggestions of a new direction of recycled technique.
The inventory of the recycling and refining process of gold element from the waste flexible printed circuit board(WFPCB) shows that the total amount of carbon emission was 89,306.6884 tonne CO2e per year in 2021 and 68,253.1933 tonne CO2e per year in 2022. Carbon emissions per gram of recycled gold is 4.3379 tonne CO2e per year in 2021, and 3.7721 tonne CO2e per year in 2022. In 2021, projects with the highest carbon emissions was manufacturing of 43,706.8963 tonne CO2e per year, and secondarily comed by energy indirect greenhouse gas emission, which was 42,466.0665 tonne CO2e per year. In 2022, projects with the highest carbon emissions by energy indirect greenhouse gas emission 36,148.2784 tonne CO2e per year and manufacturing (P)29,023.5636 tonne CO2e per year. However, since part of the data was hard to collect, waste disposal, wastewater treatment, employee commuting, the supplier of the upstream and downstream were excluded from this research. Follow-up inventories were needed for further understanding of the carbon emissions of the whole
recycling and refining process.
Based on the data collected from the inventory, this study provides a reference for reducing energy waste in the recycling and refining process, improving the utilization rate of recycled products, reducing carbon emissions in the recycling process, and the environmental impact of e-waste. The aim of the research is to promote a circular economy and give new life
to waste. |
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