(562bj) Sustainable Strategies to Recycle Waste Electrical and Electronic Plastics by Thermochemical Processes

Das, P. - Presenter, IIT Guwahati
Sirven, J. B., Nanyang Technological University
Chrispophe, J., Nanyang Technological University
Granjean, A., Nanyang Technological University
Tay, D., Nanyang Technological University
Lee, J. M., Nanyang Technological University
Electronic waste disposal and recycle are becoming a global concern as the generation of e-waste increases exponentially with time. An amount of 44.7 million metric tonnes (Mt) of e-waste was generated globally in the year 2016 and only 20% (8.9 million metric tonnes) was recycled. The presence of recoverable components, such as valuable metals (gold, silver and copper) and non-metallic fractions (plastics), makes the e-waste recycling an economically viable recycling industry particularly in the developing countries. However, e-waste contains serious toxic substances such as brominated fire retardants, heavy metals etc. [1]. These hazardous substances are responsible for the serious health issues to the people associated with the e-waste recycling and also causes pollution to the environment. Therefore, it is significant to develop sustainable technologies those can separate the toxic content and recover the valuable materials from e-waste. A significant portion of electronic waste consists of the non-metallic fractions, as most of the outer body of the small and large electronic and electrical equipment’s are made from plastics[1]. A substantial amount of plastics also present in the waste printed circuit boards. The current study focusses on the development of a thermochemical process to recover toxic free plastics, polymer or the plastics derived fuel/chemicals in the most efficient manner. Solvent extraction process [2] has been used to remove trace metals and BFRs and subsequently thermochemical processes[3] such as pyrolysis will be used to recover toxic free chemicals and fuels from the e-waste plastics.


[1] E. Dimitrakakis, A. Janz, B. Bilitewski, and E. Gidarakos, "Small WEEE: Determining recyclables and hazardous substances in plastics," Journal of Hazardous Materials, vol. 161, no. 2, pp. 913-919, 2009/01/30/ 2009.

[2] X. Zhao, L. Zhan, B. Xie, and B. Gao, "Products derived from waste plastics (PC, HIPS, ABS, PP and PA6) via hydrothermal treatment: Characterization and potential applications," Chemosphere, vol. 207, pp. 742-752, Sep 2018.

[3] Y. Shen, X. Chen, X. Ge, and M. Chen, "Thermochemical treatment of non-metallic residues from waste printed circuit board: Pyrolysis vs. combustion," Journal of Cleaner Production, vol. 176, pp. 1045-1053, 2018/03/01/ 2018.