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Article

Nitrate Removal and Dynamics of Microbial Community of A Hydrogen-Based Membrane Biofilm Reactor at Diverse Nitrate Loadings and Distances from Hydrogen Supply End

1
College of Life and Environmental Science, Guilin University of Electronic Technology, 1 Jinji Road, Guilin 541004, China
2
College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China
*
Authors to whom correspondence should be addressed.
These authors contributed to the work equally and should be regarded as co-first authors.
Water 2020, 12(11), 3196; https://doi.org/10.3390/w12113196
Received: 4 September 2020 / Revised: 9 November 2020 / Accepted: 13 November 2020 / Published: 15 November 2020
(This article belongs to the Special Issue Advanced Technologies for Sustainable Water Treatment)
The back-diffusion of inactive gases severely inhibits the hydrogen (H2) delivery rate of the close-end operated hydrogen-based membrane biofilm reactor (H2-based MBfR). Nevertheless, less is known about the response of microbial communities in H2-based MBfR to the impact of the gases’ back-diffusion. In this research, the denitrification performance and microbial dynamics were studied in a H2-based MBfR operated at close-end mode with a fixed H2 pressure of 0.04 MPa and fed with nitrate (NO3) containing influent. Results of single-factor and microsensor measurement experiments indicate that the H2 availability was the decisive factor that limits NO3 removal at the influent NO3 concentration of 30 mg N/L. High-throughput sequencing results revealed that (1) the increase of NO3 loading from 10 to 20–30 mg N/L resulted in the shift of dominant functional bacteria from Dechloromonas to Hydrogenophaga in the biofilm; (2) excessive NO3 loading led to the declined relative abundance of Hydrogenophaga and basic metabolic pathways as well as counts of most denitrifying enzyme genes; and (3) in most cases, the decreased quantity of N metabolism-related functional bacteria and genes with increasing distance from the H2 supply end corroborates that the microbial community structure in H2-based MBfR was significantly impacted by the gases’ back-diffusion. View Full-Text
Keywords: back-diffusion; biofilm; denitrification; microbial community; nitrate loading back-diffusion; biofilm; denitrification; microbial community; nitrate loading
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MDPI and ACS Style

Jiang, M.; Zhang, Y.; Yuan, Y.; Chen, Y.; Lin, H.; Zheng, J.; Li, H.; Zhang, X. Nitrate Removal and Dynamics of Microbial Community of A Hydrogen-Based Membrane Biofilm Reactor at Diverse Nitrate Loadings and Distances from Hydrogen Supply End. Water 2020, 12, 3196. https://doi.org/10.3390/w12113196

AMA Style

Jiang M, Zhang Y, Yuan Y, Chen Y, Lin H, Zheng J, Li H, Zhang X. Nitrate Removal and Dynamics of Microbial Community of A Hydrogen-Based Membrane Biofilm Reactor at Diverse Nitrate Loadings and Distances from Hydrogen Supply End. Water. 2020; 12(11):3196. https://doi.org/10.3390/w12113196

Chicago/Turabian Style

Jiang, Minmin, Yuanyuan Zhang, Yuhang Yuan, Yuchao Chen, Hua Lin, Junjian Zheng, Haixiang Li, and Xuehong Zhang. 2020. "Nitrate Removal and Dynamics of Microbial Community of A Hydrogen-Based Membrane Biofilm Reactor at Diverse Nitrate Loadings and Distances from Hydrogen Supply End" Water 12, no. 11: 3196. https://doi.org/10.3390/w12113196

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