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Life cycle impact assessment (LCIA) is a technical process to evaluate the environmental impact factors obtained in the inventory analysis stage, which is widely used internationally. LCIA model is divided into the following steps: characterization, damage assessment, standardization and weighted assessment; The following is a brief summary of the life cycle environmental impact of the following two lunch boxes.
Comparing the life cycle environmental impact of EPS lunch box and light/biodegradable lunch box, it can be found that:
(1) Among the 10 environmental impacts, only the environmental impact (ecological toxicity) of EPS lunch boxes is greater than that of light/biodegradable lunch boxes.
(2) The mineral resource consumption of EPS lunch boxes is far less than that of light/biodegradable lunch boxes. This is mainly because the weight of EPS single lunch box is only 3O of light/biodegradable lunch boxes, and PS particles can be regenerated after being discarded.
(3) The land use impact of EPS lunch boxes is far less than that of light/biodegradable lunch boxes. The former is 6. This is because only 10% of EPS lunch boxes enter the landfill, while 70% of light/biodegradable lunch boxes enter the landfill, and the biodegradable starch mainly comes from corn, which occupies a large amount of land.
(4) In terms of atmospheric organic pollution, the impact of EPS lunch box is 31. It is found through inventory analysis that the impact of atmospheric organic pollution mainly comes from the production process of plastic particles, while the impact of atmospheric organic pollution in the production process of PS particles is about 1/3 of the same impact in the production process of PP particles.