Rate-limiting factors for indirect two-step biodismantling for printed circuit board recycling

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

Resources Conservation and Recycling Pub Date : 2025-03-18 DOI:10.1016/j.resconrec.2025.108253

Benjamin Monneron-Enaud , Arturo Hernán Bravo-Méndez , Oliver Wiche , Michael Schlömann

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Abstract

Dismantling of printed circuit boards is a promising pretreatment step for the processing of electronic waste. It allows the separation and subsequent sorting of the different electronic components (ECs) and eases the downstream processes by enriching ECs and the elements contained in them. Biodismantling is a novel process using iron-oxidizing microorganisms to generate an oxidative ferric iron-rich solution to dissolve solder joints, thus releasing ECs. This study evaluates the influence of pH and iron concentration that proved to be rate-limiting factors of the dismantling reaction. Since microbial iron oxidation and dismantling may be performed in separate reactors, it also investigates the effect of sonication on dismantling and thus allows to optimize parameters for industrial applications. At pH 1.2 and 500 mM ferric iron, dismantling times were down to 10 h, but the addition of ultrasound treatment improved dismantling rates even further, reaching complete dismantling within 1.9 h.

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拆解印刷电路板是处理电子废物的一个很有前景的预处理步骤。它可以对不同的电子元件（EC）进行分离和后续分类，并通过富集电子元件及其所含元素来简化下游工艺。生物拆解是一种新工艺，利用氧化铁微生物产生富含氧化铁的溶液来溶解焊点，从而释放电子元件。本研究评估了 pH 值和铁浓度的影响，事实证明 pH 值和铁浓度是拆解反应的限制因素。由于微生物铁氧化和拆解可在不同的反应器中进行，因此本研究还考察了超声波对拆解的影响，从而优化了工业应用参数。在 pH 值为 1.2 和铁含量为 500 毫摩尔的条件下，拆解时间最短为 10 小时，但加入超声波处理后，拆解率进一步提高，在 1.9 小时内达到完全拆解。

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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.