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Thermal degradation and pollutant emission from waste printed circuit boards mounted with electronic components.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-08-18 , DOI: 10.1016/j.jhazmat.2019.121038 Jie Guo 1 , Xiaomei Luo 2 , Shufei Tan 2 , Oladele A Ogunseitan 3 , Zhenming Xu 2
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-08-18 , DOI: 10.1016/j.jhazmat.2019.121038 Jie Guo 1 , Xiaomei Luo 2 , Shufei Tan 2 , Oladele A Ogunseitan 3 , Zhenming Xu 2
Affiliation
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Waste printed circuit boards mounted with electronic components (WPCB-ECs) are generated from electronic waste dismantling and recycling process. Air-borne pollutants, including particulate matter (PM) and volatile organic compounds (VOCs), can be released during thermal treatment of WPCB-CEs. In this study, organic substances from WPCB-ECs were pyrolyzed by both thermo-gravimetric analysis (TGA) and in a quartz tube furnace. We discovered that board resin and solder coating were degraded in a one-stage process, whereas capacitor scarfskin and wire jacket had two degradation stages. Debromination of brominated flame retardants occurred, and HBr and phenol were the main products during TGA processing of board resin. Dehydrochlorination occurred, and HCl, benzene and toluene were detected during the pyrolysis of capacitor scarfskin. Benzene formation was found only in the first degradation stage (272-372 °C), while toluene was formed both in the two degradation stages. PM with bimodal mass size distributions at diameters of 0.45-0.5 and 4-5 μm were emitted during heating WPCB-ECs. The PM number concentrations were highest in the size ranges of 0.3-0.35 μm and 1.6-2 μm. The research produced new data on pollutant emissions during thermal treatment of WPCB-ECs, and information on strategies to prevent toxic exposures that compromise the health of recyclers.
中文翻译：
安装有电子元件的废印刷电路板的热降解和污染物排放。
电子废物的拆卸和回收过程会产生装有电子组件（WPCB-EC）的废物印刷电路板。WPCB-CE的热处理过程中会释放出空气中的污染物，包括颗粒物（PM）和挥发性有机化合物（VOC）。在这项研究中，来自WPCB-EC的有机物质通过热重分析（TGA）和石英管炉进行了热解。我们发现，板上树脂和焊料涂层在一个阶段的过程中被降解，而电容器丝巾皮和电线护套则经历了两个降解阶段。发生了溴化阻燃剂的脱溴，在板式树脂的TGA处理中，HBr和苯酚是主要产品。发生了脱氯化氢作用，并且在电容器皮的热解过程中检测到HCl，苯和甲苯。仅在第一个降解阶段（272-372°C）发现了苯的形成，而在两个降解阶段都形成了甲苯。在加热WPCB-EC期间发出了直径为0.45-0.5和4-5μm的双峰质量尺寸分布的PM。在0.3-0.35μm和1.6-2μm的尺寸范围内，PM数浓度最高。该研究产生了有关WPCB-EC热处理期间污染物排放的新数据，以及有关防止危害回收商健康的有毒暴露策略的信息。
更新日期：2019-08-19
中文翻译：
安装有电子元件的废印刷电路板的热降解和污染物排放。
电子废物的拆卸和回收过程会产生装有电子组件（WPCB-EC）的废物印刷电路板。WPCB-CE的热处理过程中会释放出空气中的污染物，包括颗粒物（PM）和挥发性有机化合物（VOC）。在这项研究中，来自WPCB-EC的有机物质通过热重分析（TGA）和石英管炉进行了热解。我们发现，板上树脂和焊料涂层在一个阶段的过程中被降解，而电容器丝巾皮和电线护套则经历了两个降解阶段。发生了溴化阻燃剂的脱溴，在板式树脂的TGA处理中，HBr和苯酚是主要产品。发生了脱氯化氢作用，并且在电容器皮的热解过程中检测到HCl，苯和甲苯。仅在第一个降解阶段（272-372°C）发现了苯的形成，而在两个降解阶段都形成了甲苯。在加热WPCB-EC期间发出了直径为0.45-0.5和4-5μm的双峰质量尺寸分布的PM。在0.3-0.35μm和1.6-2μm的尺寸范围内，PM数浓度最高。该研究产生了有关WPCB-EC热处理期间污染物排放的新数据，以及有关防止危害回收商健康的有毒暴露策略的信息。
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