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    Unraveling the Influent Surface Loading Effect on Denitrification and Microbial Community Characteristics in a Hydrogen-Based Membrane Biofilm Reactor under Nitrate Stress

    Source: Journal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 005::page 04025015-1
    Author:
    Meng Zhang
    ,
    Ruize Sun
    ,
    Qiuchen Yu
    ,
    Chenyuan Zhang
    ,
    Xiaofei Wang
    ,
    Kun Dong
    ,
    Haixiang Li
    DOI: 10.1061/JOEEDU.EEENG-8026
    Publisher: American Society of Civil Engineers
    Abstract: Influent surface loading is an important operating parameter of hydrogen-based membrane biofilm reactors (H2-MBfRs) and greatly influences denitrification and microbial community characteristics. However, there are few studies on these effects of influent surface loading. In this study, H2-MBfRs were established to investigate the effect produced by influent loading. When influent loading was 2.16  g m−2 day−1, the maximal NO3−-N removal flux was 1.61  g m−2 day−1 (2.45 times that when the influent loading was 0.72  g m−2 day−1, which was 0.657  g m−2 day−1), and the maximal NO3−-N removal efficiency was 74.36%. High-throughput sequencing indicated that higher influent loading was a powerful driver of changes in biofilm microbial communities. Gammaproteobacteria were the dominant bacteria (52.76%–74.63%), and the H2-MBfRs were enriched with Hydrogenophaga and Rhodobacter (3.95%–17.83% and 1.95%–4.90%, respectively), especially in the outer layer, suggesting that the embodiment of positively regulated denitrification is more favorable at locations with high pollutant loads. Notably, the interactions between Methyloversatilis and other microorganisms, including Rhodobacter, Pajaroellobacter, and Reyranella were more pronounced at 2.16  g m−2 day−1. This study revealed the spatial distributions of dominant microbiota in biofilms in different flow fields, which may provide a theoretical framework for the rational regulation of H2-MBfRs influent loading and improving the stability of denitrification systems.
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      Unraveling the Influent Surface Loading Effect on Denitrification and Microbial Community Characteristics in a Hydrogen-Based Membrane Biofilm Reactor under Nitrate Stress

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    contributor authorMeng Zhang
    contributor authorRuize Sun
    contributor authorQiuchen Yu
    contributor authorChenyuan Zhang
    contributor authorXiaofei Wang
    contributor authorKun Dong
    contributor authorHaixiang Li
    date accessioned2025-08-17T23:01:46Z
    date available2025-08-17T23:01:46Z
    date copyright5/1/2025 12:00:00 AM
    date issued2025
    identifier otherJOEEDU.EEENG-8026.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307800
    description abstractInfluent surface loading is an important operating parameter of hydrogen-based membrane biofilm reactors (H2-MBfRs) and greatly influences denitrification and microbial community characteristics. However, there are few studies on these effects of influent surface loading. In this study, H2-MBfRs were established to investigate the effect produced by influent loading. When influent loading was 2.16  g m−2 day−1, the maximal NO3−-N removal flux was 1.61  g m−2 day−1 (2.45 times that when the influent loading was 0.72  g m−2 day−1, which was 0.657  g m−2 day−1), and the maximal NO3−-N removal efficiency was 74.36%. High-throughput sequencing indicated that higher influent loading was a powerful driver of changes in biofilm microbial communities. Gammaproteobacteria were the dominant bacteria (52.76%–74.63%), and the H2-MBfRs were enriched with Hydrogenophaga and Rhodobacter (3.95%–17.83% and 1.95%–4.90%, respectively), especially in the outer layer, suggesting that the embodiment of positively regulated denitrification is more favorable at locations with high pollutant loads. Notably, the interactions between Methyloversatilis and other microorganisms, including Rhodobacter, Pajaroellobacter, and Reyranella were more pronounced at 2.16  g m−2 day−1. This study revealed the spatial distributions of dominant microbiota in biofilms in different flow fields, which may provide a theoretical framework for the rational regulation of H2-MBfRs influent loading and improving the stability of denitrification systems.
    publisherAmerican Society of Civil Engineers
    titleUnraveling the Influent Surface Loading Effect on Denitrification and Microbial Community Characteristics in a Hydrogen-Based Membrane Biofilm Reactor under Nitrate Stress
    typeJournal Article
    journal volume151
    journal issue5
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/JOEEDU.EEENG-8026
    journal fristpage04025015-1
    journal lastpage04025015-12
    page12
    treeJournal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 005
    contenttypeFulltext
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