AN ECO-TYPE MICROBIAL FUEL CELL FOR SIMULTANEOUS ELECTRICITY GENERATION AND NITROGEN REMOVAL

LIU Shentan; WANG Zuo

doi:10.13205/j.hjgc.202312014

Volume 41 Issue 12

Dec. 2023

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LIU Shentan, WANG Zuo. AN ECO-TYPE MICROBIAL FUEL CELL FOR SIMULTANEOUS ELECTRICITY GENERATION AND NITROGEN REMOVAL[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 116-122,149. doi: 10.13205/j.hjgc.202312014

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AN ECO-TYPE MICROBIAL FUEL CELL FOR SIMULTANEOUS ELECTRICITY GENERATION AND NITROGEN REMOVAL

doi: 10.13205/j.hjgc.202312014

LIU Shentan^{1,2
,
,},
WANG Zuo¹

1. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
2. Faculty of Engineering, Lund University, Lund SE-22100, Sweden

Received Date: 2022-05-26
Available Online: 2024-03-08

Abstract

Abstract

Ecotype-microbial fuel cell (E-MFC) is a novel wastewater treatment technology that combines microbial fuel cell (MFC) with aquatic animals and plants. To study the symbiotic synergy among "microorganisms, aquatic plants and benthic animals" in E-MFC, a series of reactors consisting of sediment MFC (S-MFC), wetland plant MFC (WP-MFC, planting aquatic plants) and ecotype-MFC (E-MFC, introducing aquatic plants and benthic animals) were set up in this experiment, to test their electricity production capacity and nitrogen removal effects. The effects of hydraulic retention time (HRT) and cathode aeration on nitrogen removal and electricity production of the E-MFC were investigated, and the main nitrogen removal mechanisms were discussed. The results showed that the nitrogen removal and electricity production performance of the E-MFC were better than the other two reactors. When treating the same amount of organic wastewater, the maximum power density of E-MFC was 129.4% and 47.2% higher than that of S-MFC and WP-MFC, ammonia nitrogen removal efficiency was 37.6% and 11.2% higher, respectively, and nitrate nitrogen removal efficiency reached 96% above. Further research showed that when HRT was 72 h and water inflow was 0.50 L/d, the E-MFC obtained the highest output voltage of 463 mV, and the corresponding output power density was 27.31 mW/m². When the cathodic aeration rate was 60 L/h, the maximum output power reached 38.12 mW/m². In the E-MFC, the disturbance and other activities of aquatic animals enhanced oxygen mass transfer, organic matter decomposition, and nutrient cycling, providing sufficient nutrients for plant growth. In addition, root oxygen secretion also maintained good environmental conditions for the growth and metabolism of rhizosphere microorganisms. Microorganisms, aquatic plants, and benthic animals in the E-MFC formed a relationship of mutual promotion and synergy, thus strengthening the removal of nitrogen from wastewater. As a new ecological restoration technology, E-MFC can recover electric energy and have a good development prospect in the field of wastewater treatment.
- ecotype-microbial fuel cell,
- nitrogen removal,
- electricity generation,
- constructed wetlands,
- hydraulic retention time

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References

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