Individual and competitive removal of Cr(VI) and Cu(II) by microbial fuel cell constructed wetlands
(2025) In Journal of Environmental Chemical Engineering 13(2).- Abstract
Microbial fuel cell constructed wetlands (MFC-CWs) represent a novel, low-carbon wastewater treatment technology for heavy metal removal and bioelectricity generation. This study compared MFC-CW performance in treating single and mixed heavy metal wastewater. Single Cu(II) and Cr(VI) removal was more efficient individually than in combination. For Cu(II), removal efficiency initially increased with concentration but then decreased, peaking at 82.57 % with a 50 mg/L concentration after 12 h. Although high Cr(VI) concentrations inhibited its removal, the rate remained above 99 % at 12 mg/L. In mixed Cu(II)/Cr(VI) wastewater, the removal rate constants of Cu(II) and Cr(VI) were 39.9 % and 44.4 % lower than for individual treatments,... (More)
Microbial fuel cell constructed wetlands (MFC-CWs) represent a novel, low-carbon wastewater treatment technology for heavy metal removal and bioelectricity generation. This study compared MFC-CW performance in treating single and mixed heavy metal wastewater. Single Cu(II) and Cr(VI) removal was more efficient individually than in combination. For Cu(II), removal efficiency initially increased with concentration but then decreased, peaking at 82.57 % with a 50 mg/L concentration after 12 h. Although high Cr(VI) concentrations inhibited its removal, the rate remained above 99 % at 12 mg/L. In mixed Cu(II)/Cr(VI) wastewater, the removal rate constants of Cu(II) and Cr(VI) were 39.9 % and 44.4 % lower than for individual treatments, reaching 0.0914 h−1 and 0.0800 h−1, respectively. The maximum power density of the MFC-CW for treating composite Cu(II)/Cr(VI) wastewater reached 24.32 mW/m2, 21.6 % and 33.1 % lower than for single Cu(II) and Cr(VI) treatments, respectively. Cyclic voltammetry results revealed distinct redox peaks for Cu(II) and Cr(VI) within the potential range of −0.5 V and 0.8 V. Cu(II) and Cr(VI) removal pathways showed that electrode deposition contributed 55.5 % and 62.7 % to the removal of each metal, respectively, while plant accumulation contributed 15.7 % and 16.4 %. Proteobacteria and Bacteroidota were predominant phyla in the MFC-CWs. At genus level, after the addition of Cu(II)/Cr(VI), the abundance of Lysobacter and Pseudoxanthomonas increased slightly, while the abundance of Rhodobacter decreased by 13.02 %, respectively, and these cathode-attached microorganisms were closely related to heavy metal reduction. The relative abundance of anodic electroactive Geobacter decreased by 3.85 %, indicating that complex heavy metals reduced microbial community abundance.
(Less)
- author
- Liu, Shentan ; Wang, Mixue ; Deng, Yuehua ; Feng, Xiaojuan and Pyo, Sang Hyun LU
- organization
- publishing date
- 2025
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Bioelectricity, Constructed wetland, Heavy metal, Microbial fuel cell
- in
- Journal of Environmental Chemical Engineering
- volume
- 13
- issue
- 2
- article number
- 115917
- publisher
- Elsevier
- external identifiers
-
- scopus:85218354807
- ISSN
- 2213-3437
- DOI
- 10.1016/j.jece.2025.115917
- language
- English
- LU publication?
- yes
- id
- 6b8d41f5-6bd2-4b8d-989f-8419d84a8580
- date added to LUP
- 2025-06-10 11:27:49
- date last changed
- 2025-06-10 11:27:57
@article{6b8d41f5-6bd2-4b8d-989f-8419d84a8580,
abstract = {{<p>Microbial fuel cell constructed wetlands (MFC-CWs) represent a novel, low-carbon wastewater treatment technology for heavy metal removal and bioelectricity generation. This study compared MFC-CW performance in treating single and mixed heavy metal wastewater. Single Cu(II) and Cr(VI) removal was more efficient individually than in combination. For Cu(II), removal efficiency initially increased with concentration but then decreased, peaking at 82.57 % with a 50 mg/L concentration after 12 h. Although high Cr(VI) concentrations inhibited its removal, the rate remained above 99 % at 12 mg/L. In mixed Cu(II)/Cr(VI) wastewater, the removal rate constants of Cu(II) and Cr(VI) were 39.9 % and 44.4 % lower than for individual treatments, reaching 0.0914 h<sup>−1</sup> and 0.0800 h<sup>−1</sup>, respectively. The maximum power density of the MFC-CW for treating composite Cu(II)/Cr(VI) wastewater reached 24.32 mW/m<sup>2</sup>, 21.6 % and 33.1 % lower than for single Cu(II) and Cr(VI) treatments, respectively. Cyclic voltammetry results revealed distinct redox peaks for Cu(II) and Cr(VI) within the potential range of −0.5 V and 0.8 V. Cu(II) and Cr(VI) removal pathways showed that electrode deposition contributed 55.5 % and 62.7 % to the removal of each metal, respectively, while plant accumulation contributed 15.7 % and 16.4 %. Proteobacteria and Bacteroidota were predominant phyla in the MFC-CWs. At genus level, after the addition of Cu(II)/Cr(VI), the abundance of Lysobacter and Pseudoxanthomonas increased slightly, while the abundance of Rhodobacter decreased by 13.02 %, respectively, and these cathode-attached microorganisms were closely related to heavy metal reduction. The relative abundance of anodic electroactive Geobacter decreased by 3.85 %, indicating that complex heavy metals reduced microbial community abundance.</p>}},
author = {{Liu, Shentan and Wang, Mixue and Deng, Yuehua and Feng, Xiaojuan and Pyo, Sang Hyun}},
issn = {{2213-3437}},
keywords = {{Bioelectricity; Constructed wetland; Heavy metal; Microbial fuel cell}},
language = {{eng}},
number = {{2}},
publisher = {{Elsevier}},
series = {{Journal of Environmental Chemical Engineering}},
title = {{Individual and competitive removal of Cr(VI) and Cu(II) by microbial fuel cell constructed wetlands}},
url = {{http://dx.doi.org/10.1016/j.jece.2025.115917}},
doi = {{10.1016/j.jece.2025.115917}},
volume = {{13}},
year = {{2025}},
}