塑料废料
物流分析
聚对苯二甲酸乙二醇酯
环境科学
废物管理
温室气体
分类
生命周期评估
废纸
循环经济
资源回收
资源(消歧)
物流
制浆造纸工业
生产(经济)
计算机科学
环境工程
材料科学
工程类
废水
经济
复合材料
生态学
计算机网络
宏观经济学
生物
程序设计语言
作者
Raymond L. Smith,T. Sudhakar Rao,Rachelle C. Riegerix
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-02-02
卷期号:10 (6): 2084-2096
被引量:30
标识
DOI:10.1021/acssuschemeng.1c06845
摘要
As efforts are made toward establishing a circular economy that engages in activities that maintain resources at their highest values for as long as possible, an important aspect is understanding the systems which allow recycling to occur. In this article a common plastic, polyethylene terephthalate, i.e., PET or plastic #1, has been studied because it is recycled at relatively high rates in the U.S. as compared to other plastics. A material flow analysis is described for PET resin showing materials collected, reclaimed for flake, and converted into items with recycled content. Imports/exports, reclaimer residue, and disposal with mismanaged waste are all shown for U.S. flows of PET. Barriers to recycling PET exist in the collecting, sorting, reclaiming, and converting steps, and this article describes them, offers some solutions, and suggests some research that chemists and engineers could focus on to improve the systems. This effort also models sorting at material recovery facilities (MRF) and reclaimers, with detailed descriptions of the material streams involved, to characterize the resource use and emissions from these operations that are key processes in the recycling system. Example results include greenhouse gas intensities of 8.58 kg CO2 equiv per ton of MRF feed and 103.7 kg CO2 equiv per ton of reclaimer PET bale feed. The results can be used in system analyses for various scenarios and as inputs in economic input-output and life cycle assessments.
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