Constructed wetlands integrated with microbial fuel cells for COD and nitrogen removal affected by plant and circuit operation mode

Wen, Huiyang, Zhu, Hui, Yan, Baixing, Shutes, R. Brian E., Yu, Xiangfei, Cheng, Rui, Chen, Xin and Wang, Xinyi (2020) Constructed wetlands integrated with microbial fuel cells for COD and nitrogen removal affected by plant and circuit operation mode. Environmental Science and Pollution Research . ISSN 0944-1344 [Article] (Published online first) (doi:10.1007/s11356-020-10632-3)

Abstract

Organic matter and NH -N are two major pollutants in domestic sewage. This study evaluated the influence of plant and circuit operation mode on the performance of constructed wetlands integrated with microbial fuel cells (CW-MFCs) and investigated the removal mechanisms of organic matter and nitrogen. Better chemical oxygen demand (COD) removal was achieved in closed-circuit CW-MFCs regardless of planting or not, with average removal efficiencies of 83.19-86.28% (closed-circuit CW-MFCs) and 76.54-83.19% (open-circuit CW-MFCs), respectively. More than 70% organic matter was removed in the anaerobic region of all CW-MFCs. In addition, the planted CW-MFCs outperformed the unplanted CW-MFCs in ammonium, nitrate, and total nitrogen removal irrespective of circuit connection or not, for example, the NH -N removal efficiencies of 95.91-96.82% were achieved in planted CW-MFCs compared with 56.54-59.95% achieved by unplanted CW-MFCs. Besides, 33.14-55.69% of NH -N was removed in the anaerobic region. Throughout the experiment, the average voltages of planted and unplanted CW-MFCs were 264 mV and 108 mV, with the corresponding maximum voltage output of 544 mV and 321 mV, respectively. Furthermore, planted CW-MFCs, simultaneously producing a peak power density of 92.05 mW m with a coulombic efficiency of 0.50%, exhibited better than unplanted CW-MFCs (3.29 mW m and 0.21%, respectively) in bioelectricity generation characteristics. Graphical abstract.

Item Type: Article
Keywords (uncontrolled): COD, Circuit operation mode, Constructed wetlands, Microbial fuel cells, Nitrogen removal, Plant
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 31005
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Depositing User: Jisc Publications Router
Date Deposited: 22 Sep 2020 07:20
Last Modified: 23 Sep 2020 17:22
URI: https://eprints.mdx.ac.uk/id/eprint/31005

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