Near-infrared-based quality control of plastic pre-concentrates in lightweight-packaging waste sorting plants

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2023-11-27 DOI:10.1016/j.resconrec.2023.107256

Nils Kroell , Xiaozheng Chen , Bastian Küppers , Sabine Schlögl , Alexander Feil , Kathrin Greiff

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引用次数: 1

Abstract

Today's post-consumer plastic recycling is limited by labor-intensive manual quality control (MQC) procedures, resulting in largely unknown pre-concentrate purities. Sensor-based quality control (SBQC) could enable an automated inline quality monitoring and thus contribute to a more transparent and enhanced plastic recycling. Therefore, we investigated the technical feasibility of near-infrared-based SBQC for plastic pre-concentrates in a lightweight packaging waste sorting plant. The developed SBQC method outperformed MQC methods by reducing measurement uncertainties from between ±0.8 wt% and ±6.7 wt% (MQC) to ±0.31 wt% (SBQC) for bale-specific purities at monolayered material flow presentations. In addition, we show that SBQC may even be possible at multilayered material flow presentations, although further research is needed to address identified segregation effects. The demonstrated technical feasibility of SBQC at plant scale represents a major breakthrough as it opens new opportunities in plastic recycling, such as adaptive pricing models and intelligent process control in sorting plants.

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基于近红外的轻包装废弃物分拣厂塑料预浓缩物质量控制

今天的消费后塑料回收受到劳动密集型人工质量控制(MQC)程序的限制，导致预浓缩纯度很大程度上未知。基于传感器的质量控制(SBQC)可以实现自动在线质量监测，从而有助于提高塑料回收的透明度和效率。因此，我们研究了基于近红外SBQC的塑料预精矿在轻型包装废物分拣厂的技术可行性。开发的SBQC方法优于MQC方法，在单层物料流表现下，将包特定纯度的测量不确定度从±0.8 wt%到±6.7 wt% (MQC)降低到±0.31 wt% (SBQC)。此外，我们表明SBQC甚至可能在多层物质流中出现，尽管需要进一步的研究来解决已确定的分离效应。SBQC在工厂规模上的技术可行性证明是一个重大突破，因为它为塑料回收开辟了新的机会，例如自适应定价模型和分拣厂的智能过程控制。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.