Bioenergy generation and simultaneous nitrate and phosphorus removal in a pyrite-based constructed wetland-microbial fuel cell. (January 2020)

• Record Type: Journal Article
• Authors: Ge, Xiaoyan; Cao, Xin; Song, Xinshan; Wang, Yuhui; Si, Zhihao; Zhao, Yufeng; Wang, Wenting; Tesfahunegn, Awet Arefe
• Is Part Of: Bioresource technology. Volume 296(2020)
• Publication Date: 2020-01
• Subjects: Pyrite -- Constructed wetland -- Microbial fuel cell -- Power density -- Mixotrophic denitrification; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122350
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The PCW-MFC enhanced simultaneous nitrate and phosphorus removal. The PCW-MFC generated much more bioelectricity than the CW-MFC. A stable pH value and low sulfate concentration were observed in the PCW-MFC. Geobacter and sulfate-reducing bacteria (SRB) were enriched in the PCW-MFC. Abstract: This study investigates the performance of a pyrite-based constructed wetland-microbial fuel cell (PCW-MFC) in chemical oxygen demand (COD), nitrate (NO3 − -N), total inorganic nitrogen (TIN), and total phosphorus (TP) removal and bioelectricity generation, and explores the mechanisms involved. Four microcosms were used: a constructed wetland (CW), a pyrite-based constructed wetland (PCW), a constructed wetland-microbial fuel cell (CW-MFC), and a PCW-MFC. After 180 days' operation, the PCW-MFC exhibited enhanced simultaneous nitrate and phosphorus removal and bioelectricity output. The maximum COD, NO3 − -N, TIN, and TP removal efficiencies in the PCW-MFC were 71.9%, 70.1%, 63.2%, and 91.2%, respectively, for a hydraulic retention time (HRT) of 6 h. The mean bioelectricity output of the PCW-MFC was 19.0–28.4% higher than that of the CW-MFC. The nitrate removal rate constant of the PCW-MFC was 1.04 d −1, which is significantly higher than those of the others. Geobacter and sulfate-reducing bacteria were enriched in the PCW-MFC.