美国材料回收设施 (MRF) #3-7混合塑料废物的评估
Victor S Cecon1, Greg W Curtzwiler1, Keith L Vorst1
1Polymer and Food Protection Consortium, Iowa State University, 536 Farmhouse Lane, Ames IA, 50011, USA; Department of Food Science and Human Nutrition, Iowa State University, 536 Farmhouse Lane, Ames IA, 50011, USA.
Waste management (New York, N.Y.)
|September 12, 2023
概括
美国塑料回收率低,阻碍了废物转移. 这项研究表明,混合塑料3-7可以机械回收,改善废物管理和资源回收.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 美国的塑料回收率仍然低于10%,大多数未回收的塑料 (RIC #3-7) 最终会被填埋在垃圾填埋场或废物转化为能源设施.
- 了解这些混合塑料包的成分和质量对于制定加强回收工作的策略至关重要.
研究的目的:
- 评估来自不同材料回收设施 (MRF) 的含有塑料3-7的出口包的组成和质量.
- 确定在机械回收过程中利用填埋场转移的混合塑料废物的潜力.
主要方法:
- 从不同的美国MRF收集了三包混合塑料 (#3-7).
- 手动分类和描述包子的成分,包括PET和HDPE的残留含量.
- 传统回收工艺 (洗,挤压,注塑) 的应用,其次是物理,热和分子表征.
主要成果:
- 在MRF中观察到子组成的显著差异,与它们的分类技术相关.
- 在指定为3-7塑料的包子中发现了大量可回收聚合物,如PET和HDPE.
- 尽管组成上有差异,但在样本中发现了一些一致的聚合物特性,表明可加工性.
结论:
- 在垃圾填埋场转移的混合塑料废物,特别是RIC#3-7,可以成为机械回收的可行的原料.
- 开发适应一致的聚合物特性的回收工艺是可行的.
- 升级MRF分类系统对于防止可回收材料污染废物流或进入垃圾填埋场至关重要.
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