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<p>The disposal of printed circuit boards (PCBs) from waste electrical and electronic equipment (WEEE) is highly hazardous, making reuse and recycling a challenge due to the presence of halogenated compounds as fire retardants. Reduction of halogenated compounds, along with energy and material recovery, can be accomplished through co-pyrolysis with biomass such as rice husk (RH), resulting in the production of gas, solid char, and primarily liquid oil. This study investigates the pyrolysis of PCB, RH, and a 1:1 mixture of PCB: RH. Thermal degradation of these samples was conducted at the temperature range of 25&#xa0;°C to 700&#xa0;°C, under nitrogen atmosphere. Lab scale experiments using a fixed bed reactor were conducted under the same conditions as the TGA analysis. The oil yield from PCB alone was very low (4%), which increased to 14% (250%) through (1:1) PCB: RH co-pyrolysis. GC–MS results showed that phenol and phenolic compounds in the PCB: RH oil increased to 76.12%, compared to 8.17% in the RH pyrolysis oil, which can be efficiently separated and repurposed for various industrial applications. Additionally, the process revealed a significant reduction in halogenated compounds for PCB: RH oil compared to the PCB oil, highlighting the effectiveness of co-pyrolysis in reducing hazardous byproducts.</p>

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Dehalogenation of pyrolytic oil from printed circuit boards with rice husk

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Shina Gautam,
  • Sonal Prajapati,
  • Isha Jasani,
  • Alok Gautam

摘要

The disposal of printed circuit boards (PCBs) from waste electrical and electronic equipment (WEEE) is highly hazardous, making reuse and recycling a challenge due to the presence of halogenated compounds as fire retardants. Reduction of halogenated compounds, along with energy and material recovery, can be accomplished through co-pyrolysis with biomass such as rice husk (RH), resulting in the production of gas, solid char, and primarily liquid oil. This study investigates the pyrolysis of PCB, RH, and a 1:1 mixture of PCB: RH. Thermal degradation of these samples was conducted at the temperature range of 25 °C to 700 °C, under nitrogen atmosphere. Lab scale experiments using a fixed bed reactor were conducted under the same conditions as the TGA analysis. The oil yield from PCB alone was very low (4%), which increased to 14% (250%) through (1:1) PCB: RH co-pyrolysis. GC–MS results showed that phenol and phenolic compounds in the PCB: RH oil increased to 76.12%, compared to 8.17% in the RH pyrolysis oil, which can be efficiently separated and repurposed for various industrial applications. Additionally, the process revealed a significant reduction in halogenated compounds for PCB: RH oil compared to the PCB oil, highlighting the effectiveness of co-pyrolysis in reducing hazardous byproducts.