Effects of multiple key factors on the performance of petroleum coke-based constructed wetland-microbial fuel cell. (February 2023)

• Record Type: Journal Article
• Authors: Niu, Yulong; Qu, Mingxiang; Du, Jingjing; Wang, Xilin; Yuan, Shuaikang; Zhang, Lingyan; Zhao, Jianguo; Jin, Baodan; Wu, Haiming; Wu, Shubiao; Cao, Xia; Pang, Long
• Is Part Of: Chemosphere. Volume 315(2023)
• Publication Date: 2023-02
• Subjects: Constructed wetlands -- Microbial fuel cell -- Removal efficiency -- Output voltage -- Quorum sensing; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2023.137780
• Languages: English
• ISSNs: 0045-6535

Abstract

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. Graphical abstract: Image 1 Highlights: Multiple key factors of CW-MFC were explored in petroleum coke-based CW-MFC. Higher TN removal efficiency and power generation was achieved in the CCW-MFC. Network analysis indicated quorum sensing could be occurred in systems.