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Removal and reduction mechanism of Cr (VI) in Leersia hexandra Swartz constructed wetland-microbial fuel cell coupling system

Authors :
Yucui Shi
Qing Liu
Guowei Wu
Shasha Zhao
Yongwei Li
Shaohong You
Guofu Huang
Source :
Ecotoxicology and Environmental Safety, Vol 277, Iss , Pp 116373- (2024)
Publication Year :
2024
Publisher :
Elsevier, 2024.

Abstract

Cr (VI) is extremely harmful to both the environment and human health, and it can linger in the environment for a very long period. In this research, the Leersia hexandra Swartz constructed wetland-microbial fuel cell (CW-MFC) system was constructed to purify Cr (VI) wastewater. By comparing with the constructed wetland (CW) system, the system electricity generation, pollutants removal, Cr enrichment, and morphological transformation of the system were discussed. The results demonstrated that the L. hexandra CW-MFC system promoted removal of pollutants and production of electricity of the system. The maximum voltage of the system was 499 mV, the COD and Cr (VI) removal efficiency was 93.73% and 97.00%. At the same time, it enhanced the substrate and L. hexandra ability to absorb Cr and change it morphologically transformation. Additionally, the results of XPS and XANES showed that the majority of the Cr in the L. hexandra and substrate was present as Cr (III). In the L. hexandra CW-MFC system, Geobacter also functioned as the primary metal catabolic reducing and electrogenic bacteria. As a result, L. hexandra CW-MFC system possesses the added benefit of removing Cr (VI) while producing energy compared to the traditional CW system.

Details

Language :
English
ISSN :
01476513
Volume :
277
Issue :
116373-
Database :
Directory of Open Access Journals
Journal :
Ecotoxicology and Environmental Safety
Publication Type :
Academic Journal
Accession number :
edsdoj.9b8ec807248b4c6fb0c26573503df215
Document Type :
article
Full Text :
https://doi.org/10.1016/j.ecoenv.2024.116373