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Co-pyrolysis of E‑Waste Nonmetallic Residues with Biowastes

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posted on 2018-05-31, 00:00 authored by Yafei Shen, Rui Yuan, Xingming Chen, Xinlei Ge, Mindong Chen
This work studied the copyrolysis of nonmetallic fractions from waste printed circuit boards (NMF-WPCB) with rice husk (RH). The chemical pretreatment integrated with pyrolysis was evaluated for copyrogasification valorization of e-waste plastics and biowastes for value-added fuel (e.g., syngas) production. The copyrolysis with cellulose-rich biomass can improve the NMF thermolysis efficiency, while the copyrolysis with lignin-rich biomass improved the activation energy. The copyrolysis NMF with RH can improve the fuel property and thermal conversion efficiency. Metals in the NMF were primarily removed by the acid leaching. Subsequently, the preloaded NaOH could react with the small-molecular bromine compounds (e.g., HBr/Br2 releasing from the BFRs pyrolysis) to form more stable NaBr. Minerals (e.g., alkalis) in RH and NMF enhanced the Br stabilization in the char. In general, the syngas from the copyrolysis of PNMF with RH can be applied for fuels, while the char with lower contents of heavy metals is terminally disposed of by safely landfilling it.

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