Effects of multiple key factors on the performance of petroleum coke-based constructed wetland-microbial fuel cell

Yulong Niu; Mingxiang Qu; Jingjing Du; Xilin Wang; Shuaikang Yuan; Lingyan Zhang; Jianguo Zhao; Baodan Jin; Haiming Wu; Shubiao Wu; Xia Cao; Long Pang

doi:10.1016/j.chemosphere.2023.137780

Effects of multiple key factors on the performance of petroleum coke-based constructed wetland-microbial fuel cell

Chemosphere. 2023 Feb:315:137780. doi: 10.1016/j.chemosphere.2023.137780. Epub 2023 Jan 6.

Authors

Yulong Niu¹, Mingxiang Qu¹, Jingjing Du², Xilin Wang¹, Shuaikang Yuan¹, Lingyan Zhang¹, Jianguo Zhao³, Baodan Jin³, Haiming Wu⁴, Shubiao Wu⁵, Xia Cao⁶, Long Pang³

Affiliations

¹ School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
² School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China. Electronic address: dujj@zzuli.edu.cn.
³ School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China.
⁴ School of Environmental Science & Engineering, Shandong University, Qingdao, China.
⁵ Department of Agroecology, Aarhus University, Tjele, Denmark.
⁶ School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China. Electronic address: 2020003@zzuli.edu.cn.

PMID: 36623598
DOI: 10.1016/j.chemosphere.2023.137780

Abstract

In this study, two constructed wetland-microbial fuel cells (CW-MFC), including a closed-circuit system (CCW-MFC) and an open-circuit system (OCW-MFC) with petroleum coke as electrode and substrate, were constructed to explore the effect of multiple key factors on their operation performances. Compared to a traditional CW, the CCW-MFC system showed better performance, achieving an average removal efficiency of COD, NH₄⁺-N, and TN of 94.49 ± 1.81%, 94.99 ± 4.81%, and 84.67 ± 5.6%, respectively, when the aeration rate, COD concentration, and hydraulic retention time were 0.4 L/min, 300 mg/L, and 3 days. The maximum output voltage (425.2 mV) of the CCW-MFC system was achieved when the aeration rate was 0.2 L/min. In addition, the CCW-MFC system showed a greater denitrification ability due to the higher abundance of Thiothrix that might attract other denitrifying bacteria, such as Methylotenera and Hyphomicrobium, to participate in the denitrifying process, indicating the quorum sensing could be stimulated within the denitrifying microbial community.

Keywords: Constructed wetlands; Microbial fuel cell; Output voltage; Quorum sensing; Removal efficiency.

MeSH terms

Bacteria
Bioelectric Energy Sources* / microbiology
Coke*
Electricity
Electrodes
Wastewater
Wetlands

Substances

Coke
Wastewater