ENHANCED NITRIFICATION AND DENITRIFICATION BY COUPLING MICROBIAL ELECTROLYSIS CELL IN A SINGLE BED VERTICAL FLOW CONSTRUCTED WETLAND

ZHANG Jie; ZHANG Jian; CAO Xiaoqiang; CHEN Xinhan; LIU Huaqing

doi:10.13205/j.hjgc.202306005

Volume 41 Issue 6

Jun. 2023

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ZHANG Jie, ZHANG Jian, CAO Xiaoqiang, CHEN Xinhan, LIU Huaqing. ENHANCED NITRIFICATION AND DENITRIFICATION BY COUPLING MICROBIAL ELECTROLYSIS CELL IN A SINGLE BED VERTICAL FLOW CONSTRUCTED WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 32-37,70. doi: 10.13205/j.hjgc.202306005

Citation:

ZHANG Jie, ZHANG Jian, CAO Xiaoqiang, CHEN Xinhan, LIU Huaqing. ENHANCED NITRIFICATION AND DENITRIFICATION BY COUPLING MICROBIAL ELECTROLYSIS CELL IN A SINGLE BED VERTICAL FLOW CONSTRUCTED WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 32-37,70. doi: 10.13205/j.hjgc.202306005

Citation:

ZHANG Jie, ZHANG Jian, CAO Xiaoqiang, CHEN Xinhan, LIU Huaqing. ENHANCED NITRIFICATION AND DENITRIFICATION BY COUPLING MICROBIAL ELECTROLYSIS CELL IN A SINGLE BED VERTICAL FLOW CONSTRUCTED WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 32-37,70. doi: 10.13205/j.hjgc.202306005

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ENHANCED NITRIFICATION AND DENITRIFICATION BY COUPLING MICROBIAL ELECTROLYSIS CELL IN A SINGLE BED VERTICAL FLOW CONSTRUCTED WETLAND

doi: 10.13205/j.hjgc.202306005

ZHANG Jie^1,2,
ZHANG Jian^1,3,
CAO Xiaoqiang^1,3,
CHEN Xinhan^1,3,
LIU Huaqing^{1,3
,
,}

1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. College of Resources and Environment, Shandong Agricultural University, Taian 271018, China;
3. Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao 266590, China

Received Date: 2023-02-28
Available Online: 2023-09-02

Abstract

Abstract

To investigate the effect of microbial electrolysis cells on the nitrification and denitrification performance of constructed wetlands, vertical flow constructed wetland-microbial electrolysis cell systems with closed circuit operation (VFCW-MEC) and open circuit operation (VFCW-C) were constructed. The nitrogen removal performance and N₂O emission characteristics of the coupled wetland systems with different external voltages (0, 0.2, 0.4 V) were investigated. The results showed that NH₄-N and TN removal efficiencies of VFCW-MEC were higher than that of VFCW-C, and the NH₄-N removal efficiencies of VFCW-MEC at external voltages of 0, 0.2, 0.4 V were (61.66±0.30)%, (69.21±0.31)% and (74.82±0.27)%, respectively, and the corresponding values for TN were (11.53±0.35)%, (20.06±0.59)% and (33.29±0.35)%, respectively. These observations indicated that the external voltage can enhance the NH₄⁺-N and TN removal efficiency of the wetland system. By analysing the variation patterns of nitrogen concentration in the anode and cathode zones of the VFCW-MEC system, it was found that the anode and cathode enhanced nitrification and denitrification efficiencies, respectively. Microbial hydrogen production and direct electron transfer contributed to the enhanced denitrification efficiency in the cathode. It is worth that the external voltage increases the efficiency of N₂O emission, which is not conducive to greenhouse gas reduction. These findings show the potential of microbial electrolytic cells for enhancing nitrogen removal of constructed wetlands.
- vertical flow constructed wetland,
- microbial electrolytic cell,
- external voltage,
- nitrification and denitrification,
- N₂O

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References(30)

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