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

Yucui Shi; Qing Liu; Guowei Wu; Shasha Zhao; Yongwei Li; Shaohong You; Guofu Huang

Ecotoxicology and Environmental Safety (Jun 2024)

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

Yucui Shi,
Qing Liu,
Guowei Wu,
Shasha Zhao,
Yongwei Li,
Shaohong You,
Guofu Huang

Affiliations

Yucui Shi: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China; Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang 262700, China; Weifang Key Laboratory of Chemical Wastewater Pollution Control and Resource Reuse, Weifang 262700, China
Qing Liu: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China; Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang 262700, China; Weifang Key Laboratory of Chemical Wastewater Pollution Control and Resource Reuse, Weifang 262700, China
Guowei Wu: Shouguang Hospital of Traditional Chinese Medicine, Weifang 262700, China
Shasha Zhao: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China; Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang 262700, China; Weifang Key Laboratory of Chemical Wastewater Pollution Control and Resource Reuse, Weifang 262700, China
Yongwei Li: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China; Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang 262700, China
Shaohong You: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology of Guilin University of Technology, Guilin 541004, China; Corresponding author at: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Guofu Huang: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China; Shandong Engineering Research Center of Green and High-value Marine Fine Chemical, Weifang 262700, China; Weifang Key Laboratory of Chemical Wastewater Pollution Control and Resource Reuse, Weifang 262700, China; Corresponding author at: School of Chemical Engineering and Environment, Weifang University of Science and Technology, Weifang 262700, China

Journal volume & issue: Vol. 277
p. 116373

Abstract

Read online

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.

Published in Ecotoxicology and Environmental Safety

ISSN: 0147-6513 (Print); 1090-2414 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Technology: Environmental technology. Sanitary engineering: Environmental pollution; Geography. Anthropology. Recreation: Environmental sciences
Website: https://www.journals.elsevier.com/ecotoxicology-and-environmental-safety

About the journal

Abstract

Keywords