Recycling of Plastics in the United States: Plastic Material Flows and Polyethylene Terephthalate (PET) Recycling Processes.
Recycling of Plastics in the United States: Plastic Material Flows and Polyethylene Terephthalate (PET) Recycling Processes.
复制标题
美国塑料回收：塑料材料流和聚对苯二甲酸乙二醇酯 (PET) 回收工艺。
DOI：
10.1021/acssuschemeng.1c06845.s001
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发表时间：
2022
影响因子：
8.4
通讯作者：
Rachelle C Riegerix
中科院分区：
文献类型：
--
作者：
Raymond L. Smith;S. Takkellapati;Rachelle C Riegerix
随着努力建立循环经济，从事尽可能长时间保持资源最高价值的活动，一个重要的方面是了解允许回收的系统。在这篇文章中，一种常见的塑料，聚对苯二甲酸乙二醇酯，即，PET或塑料#1已经被研究，因为与其他塑料相比，它在美国的回收率相对较高。描述了PET树脂的物料流分析，显示了收集的材料，回收的薄片，并转化为具有回收内容的物品。进口/出口、回收机残留物和处置管理不善的废物均显示为美国PET流量。回收PET的障碍存在于收集，分类，回收和转化步骤中，本文描述了它们，提供了一些解决方案，并建议化学家和工程师可以专注于改进系统的一些研究。这项工作还模拟了材料回收设施（MRF）和回收机的分类，详细描述了所涉及的材料流，以描述这些操作的资源使用和排放，这些操作是回收系统中的关键过程。示例性结果包括每吨MRF进料8.58kg CO2当量和每吨回收机PET捆进料103.7kg CO2当量的温室气体强度。其结果可用于各种情景的系统分析，并可作为经济投入产出和生命周期评估的投入。
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.