Remediation of emerging contaminated sites due to uncontrolled e-waste recycling

Siyi LIN, Xun Wen CHEN, Zongwei CAI, Jianbo SHI, Jianjie FU, Guibin JIANG, Ming Hung WONG

Research output: Contribution to journalArticlespeer-review

Abstract

The use of primitive techniques in recycling electronic waste (e-waste) has led to severe soil pollution in recent decades, posing great threats to environmental and human health. It is urgently needed to remediate e-waste-contaminated sites effectively. This is especially true for the new e-waste-receiving countries/regions, after China has banned import of e-waste since 2016. The major aim of this article is to provide a comprehensive review of the policy, management, and remediation techniques (of contaminated sites) related to e-waste recycling, based on the information gained in two mega e-waste recycling sites in China (i.e., Guiyu town and Taizhou city). The article focuses on the remediation techniques developed to decontaminate soil/sediment/water contaminated by mixtures of toxic metals and persistent organic pollutants. Recommended innovative remediation technologies include: 1) integrating the techniques of spray tower, electronic precipitation, and photocatalysis significantly reduces health risk (e.g., VOC: ∼39%; bromomethane: ∼46%) due to the gas emitted by e-waste recycling; 2) enhanced ex-situ soil washing (using biodegradable vegetable oil) with pollutant removal efficiencies of 30−97%, depending on types of agents and pollutants; 3) enhanced phytoremediation using suitable plants, microbes, and/or soil amendments. Hyperaccumulators can extract metals, e.g., cadmium up to 14.8 kg/km2. Proper vegetation further extracts, stabilizes, and degrades pollutants and restores soil functions and health. Approximately 25−90% of the residual organic pollutants can be degraded depending on types of pollutants and plant species. Since the primary principle of remediation is universal, it is hoped that remediation techniques are applicable to emerging e-waste sites in other countries/regions. Copyright © 2021 Published by Elsevier B.V.
Original languageEnglish
JournalChemical Engineering Journal
Early online dateOct 2021
DOIs
Publication statusE-pub ahead of print - Oct 2021

Citation

Lin, S., Chen, X. W., Cai, Z., Shi, J., Fu, J., Jiang, G., & Wong, M. H. (2021). Remediation of emerging contaminated sites due to uncontrolled e-waste recycling. Chemical Engineering Journal. Advance online publication. doi: 10.1016/j.cej.2021.133169

Keywords

  • Toxic metals
  • Persistent organic pollutants
  • Post-contamination management
  • Co-contamination
  • Soil washing
  • Phytoremediation

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