Cadmium removal by constructed wetlands containing different substrates: performance, microorganisms and mechanisms.

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  • Additional Information
    • Source:
      Publisher: Elsevier Applied Science Country of Publication: England NLM ID: 9889523 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2976 (Electronic) Linking ISSN: 09608524 NLM ISO Abbreviation: Bioresour Technol Subsets: MEDLINE
    • Publication Information:
      Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
    • Subject Terms:
      Cadmium*/metabolism ; Wetlands* ; Biodegradation, Environmental* ; Water Pollutants, Chemical*/metabolism; Water Purification/methods ; Bacteria/metabolism ; Wastewater/chemistry ; Cocos/chemistry ; Charcoal
    • Abstract:
      This study compared the cadmium (Cd) removal performance of constructed wetlands (CWs), including gravel (G-CW), magnetite (M-CW), coconut shell (C-CW) and biochar (B-CW). C-CW exhibited superior removal efficiencies for Cd compared to other CWs, with efficiencies of 93.18 %.C-CW benefited from the rich organic matter of coconut shells and enhanced DO consumption levels, which facilitated microbial and plant removal of Cd. The total accumulation of Cd in the substrate increased from 9.16 mg/kg to 30.66 mg/kg. Concurrently, the percentage of Cd in the organic matter-bound and residue states increased from 20.52 % to 37.56 %, which effectively reduced the bioavailability of Cd. All CWs can ensure that the plant antioxidant system is not subjected to Cd stress. Saccharimonadales and Micropruina became the dominant genera in all CWs, exhibiting a high tolerance to Cd. This study provides new understanding and theoretical support for selecting substrates to effectively treat heavy metals wastewater with CWs.
      Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024. Published by Elsevier Ltd.)
    • Contributed Indexing:
      Keywords: Constructed wetland; Heavy metal; Microorganism; Substrate material; Wastewater
    • Accession Number:
      00BH33GNGH (Cadmium)
      0 (Water Pollutants, Chemical)
      0 (biochar)
      0 (Wastewater)
      16291-96-6 (Charcoal)
    • Publication Date:
      Date Created: 20241003 Date Completed: 20241023 Latest Revision: 20241023
    • Publication Date:
      20241023
    • Accession Number:
      10.1016/j.biortech.2024.131561
    • Accession Number:
      39362346