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Influences of bioplastic polylactic acid on near-infrared-based sorting of conventional plastic
Waste Management & Research ( IF 3.9 ) Pub Date : 2021-04-09 , DOI: 10.1177/0734242x211003969
Xiaozheng Chen 1 , Nils Kroell 1 , Ke Li 1 , Alexander Feil 1 , Thomas Pretz 1
Affiliation  

Bioplastics are developed to replace oil-derived plastics due to the high consumption of oil and related environmental impacts of oil-derived plastics. It was predicted that bioplastics can potentially replace 94% of conventional plastic production. With their increasing market share, more bioplastics will end in conventional post-consumer plastic waste streams. Although part of bioplastics is biodegradable and could be biologically decomposed, mechanical recycling achieves higher ecological benefits mainly because of its low pollution risk and the reduction in requirement for virgin feedstock. In this study, the classification of lightweight packaging waste with inflow of bioplastics, more specifically polylactic acid (PLA), was analysed with near-infrared spectroscopy to evaluate the influence of bioplastics on sorting processes of conventional plastics. Besides which, the sortability of PLA was determined through investigating the physical and the spectroscopic characteristics of both non-degraded and degraded PLA. The results show that the classification of all the materials was possible with a pixel-based accuracy of higher than 97.4% and PLA does not influence the sorting process of conventional plastics regarding detection and classification. Furthermore, the sorting of PLA from post-consumer waste is possible, which makes further recycling theoretically achievable.



中文翻译:

生物塑料聚乳酸对常规塑料近红外分选的影响

由于石油的高消耗和石油衍生塑料的相关环境影响,开发生物塑料以替代石油衍生塑料。据预测,生物塑料有可能取代 94% 的传统塑料生产。随着市场份额的增加,更多的生物塑料将最终进入传统的消费后塑料废物流。虽然部分生物塑料是可生物降解的,可以进行生物分解,但机械回收获得更高的生态效益主要是因为其污染风险低和对原始原料的需求减少。在这项研究中,轻质包装废物的分类与生物塑料的流入,更具体地说是聚乳酸 (PLA),用近红外光谱分析了生物塑料对常规塑料分选过程的影响。此外,PLA 的可分选性是通过研究未降解和降解 PLA 的物理和光谱特性来确定的。结果表明,所有材料的分类都可以以高于97.4%的像素精度进行分类,并且PLA在检测和分类方面不影响传统塑料的分类过程。此外,可以从消费后废物中对 PLA 进行分类,这使得理论上可以进一步回收利用。结果表明,所有材料的分类都可以以高于97.4%的像素精度进行分类,并且PLA在检测和分类方面不影响传统塑料的分类过程。此外,可以从消费后废物中对 PLA 进行分类,这使得理论上可以进一步回收利用。结果表明,所有材料的分类都可以以高于97.4%的像素精度进行分类,并且PLA在检测和分类方面不影响传统塑料的分类过程。此外,可以从消费后废物中对 PLA 进行分类,这使得理论上可以进一步回收利用。

更新日期:2021-04-09
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