Journal
JOURNAL OF WATER PROCESS ENGINEERING
Volume 44, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jwpe.2021.102450
Keywords
Constructed wetland; Tidal flow; Microbial fuel cell; Nitrogen removal; Bacteria community
Funding
- National Natural Science Foundation of China [U20A2010]
- Natural Science Foundation of Jiangxi Province, China [20192BAB213021]
- Scientific Research Project of Education Department of Jiangxi Province, China [GJJ180417]
- Opening Fund of the State Key Laboratory of Nuclear Resources and Environment [NRE1810]
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A novel constructed wetland-microbial fuel cell system with tidal flow operation showed enhanced efficiency in ammonia nitrogen removal, with the optimal operating strategy being a D/F ratio of 1:5. The bacterial communities in the system demonstrated high reoxygenation ability, leading to improved nitrification efficiency, as well as significant role of heterotrophic aerobic denitrification bacteria.
A novel constructed wetland-microbial fuel cell system by tidal flow operation (TFCW-MFC) was constructed to intensify ammonia nitrogen removal. The nitrogen removal performance of the TFCW-MFC with different ratios of drained and flooded time (D/F ratios) was investigated to determine the optimal operating strategy. The highest TN removal efficiency of 52.89 +/- 3.16% was obtained at the D/F ratio of 1:5 (C/N ratio: 5). The bacterial communities in the anode (granular activated carbon and graphite felt, referred to as TF_a1 and TF_a2, respectively) and the cathode (graphite felt, referred to as TF_c) collected from the TFCW-MFC were characterized using 16S rRNA gene high-throughput sequencing technology. The high abundance of Nitrospira predominant in the anode indicated that the tidal flow operation strengthened the system's reoxygenation ability, thus improving the overall nitrification efficiency of the system. Besides, Acinetobacter (21.67%) in the cathode could play an important role in the heterotrophic aerobic denitrification process.
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