Microplastics removal mechanisms in constructed wetlands and their impacts on nutrient (nitrogen, phosphorus and carbon) removal: A critical review

Shaochen ZHANG, Cheng SHEN, Fuhao ZHANG, Kejun WEI, Shengdao SHAN, Yaqian ZHAO, Yu Bon MAN, Ming Hung WONG, Jin ZHANG

Research output: Contribution to journalArticlespeer-review

Abstract

Microplastics (MPs) are now prevalent in aquatic ecosystems, prompting the use of constructed wetlands (CWs) for remediation. However, the interaction between MPs and CWs, including removal efficiency, mechanisms, and impacts, remains a subject requiring significant investigation. This review investigates the removal of MPs in CWs and assesses their impact on the removal of carbon, nitrogen, and phosphorus. The analysis identifies crucial factors influencing the removal of MPs, with substrate particle size and CWs structure playing key roles. The review highlights substrate retention as the primary mechanism for MP removal. MPs hinder plant nitrogen uptake, microbial growth, community composition, and nitrogen-related enzymes, reducing nitrogen removal in CWs. For phosphorus and carbon removal, adverse effects of MPs on phosphorus elimination are observed, while their impact on carbon removal is minimal. Further research is needed to understand their influence fully. In summary, CWs are a promising option for treating MPs-contaminated wastewater, but the intricate relationship between MPs and CWs necessitates ongoing research to comprehend their dynamics and potential consequences. Copyright © 2024 Elsevier B.V. All rights reserved.

Original languageEnglish
Article number170654
JournalScience of the Total Environment
Volume918
Early online dateFeb 2024
DOIs
Publication statusPublished - Mar 2024

Citation

Zhang, S., Shen, C., Zhang, F., Wei, K., Shan, S., Zhao, Y., Man, Y. B., Wong, M. H., & Zhang, J. (2024).Microplastics removal mechanisms in constructed wetlands and their impacts on nutrient (nitrogen, phosphorus and carbon) removal: A critical review. Science of the Total Environment, 918, Article 170654. https://doi.org/10.1016/j.scitotenv.2024.170654

Keywords

  • MPs-contaminated wastewater
  • Treatment wetlands
  • Key process
  • Influencing factor
  • Treatment performance

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