Modeling of membrane-aerated biofilm: Effects of C/N ratio, biofilm thickness and surface loading of oxygen on feasibility of simultaneous nitrification and denitrification

Shinya Matsumoto, Akihiko Terada, Satoshi Tsuneda

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    89 Citations (Scopus)

    Abstract

    A multipopulation model of a membrane-aerated biofilm (MAB) considering heterotrophic bacteria (HB), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) was constructed with the simulation software AQUASIM 2.1 to corroborate the process concept of the membrane-aerated biofilm reactor (MABR) and to reveal an operational range for high chemical oxygen demand (COD) and nitrogen removal efficiencies. The modeling results confirm that simultaneous nitrification and denitrification (SND) is feasible in the MAB but not in a top-down aerated biofilm (conventional biofilm) due to the absence of oxygen for AOB and NOB. The model precisely predicts the COD, NH4 +-N, and T-N removal efficiencies and determines operating parameters like COD/nitrogen (C/N) ratio, biofilm thickness and surface loading of oxygen, which significantly affect SND efficiency. High nitrogen removal efficiency (more than 70%) is attained at ranges of C/N ratio from 3.0 to 5.25 and of biofilm thickness from 600 to 1200 μm. In addition, it was clearly demonstrated that nitrogen removal not via nitrate but via nitrite could be achieved by controlling the relative surface loadings of oxygen and ammonia, supporting the feasibility of short-cut SND with MABs.

    Original languageEnglish
    Pages (from-to)98-107
    Number of pages10
    JournalBiochemical Engineering Journal
    Volume37
    Issue number1
    DOIs
    Publication statusPublished - 2007 Oct 15

    Fingerprint

    Nitrification
    Denitrification
    Biofilms
    Nitrogen
    Oxygen
    Membranes
    Bacteria
    Biological Oxygen Demand Analysis
    Nitrogen removal
    Chemical oxygen demand
    Nitrites
    Ammonia
    Nitrates
    Software

    Keywords

    • AQUASIM
    • Biofilm modeling
    • Membrane-aerated biofilm (MAB)
    • Simultaneous nitrification and denitrification (SND)

    ASJC Scopus subject areas

    • Biotechnology
    • Bioengineering
    • Chemical Engineering(all)

    Cite this

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    title = "Modeling of membrane-aerated biofilm: Effects of C/N ratio, biofilm thickness and surface loading of oxygen on feasibility of simultaneous nitrification and denitrification",
    abstract = "A multipopulation model of a membrane-aerated biofilm (MAB) considering heterotrophic bacteria (HB), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) was constructed with the simulation software AQUASIM 2.1 to corroborate the process concept of the membrane-aerated biofilm reactor (MABR) and to reveal an operational range for high chemical oxygen demand (COD) and nitrogen removal efficiencies. The modeling results confirm that simultaneous nitrification and denitrification (SND) is feasible in the MAB but not in a top-down aerated biofilm (conventional biofilm) due to the absence of oxygen for AOB and NOB. The model precisely predicts the COD, NH4 +-N, and T-N removal efficiencies and determines operating parameters like COD/nitrogen (C/N) ratio, biofilm thickness and surface loading of oxygen, which significantly affect SND efficiency. High nitrogen removal efficiency (more than 70{\%}) is attained at ranges of C/N ratio from 3.0 to 5.25 and of biofilm thickness from 600 to 1200 μm. In addition, it was clearly demonstrated that nitrogen removal not via nitrate but via nitrite could be achieved by controlling the relative surface loadings of oxygen and ammonia, supporting the feasibility of short-cut SND with MABs.",
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    author = "Shinya Matsumoto and Akihiko Terada and Satoshi Tsuneda",
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    AU - Terada, Akihiko

    AU - Tsuneda, Satoshi

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    N2 - A multipopulation model of a membrane-aerated biofilm (MAB) considering heterotrophic bacteria (HB), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) was constructed with the simulation software AQUASIM 2.1 to corroborate the process concept of the membrane-aerated biofilm reactor (MABR) and to reveal an operational range for high chemical oxygen demand (COD) and nitrogen removal efficiencies. The modeling results confirm that simultaneous nitrification and denitrification (SND) is feasible in the MAB but not in a top-down aerated biofilm (conventional biofilm) due to the absence of oxygen for AOB and NOB. The model precisely predicts the COD, NH4 +-N, and T-N removal efficiencies and determines operating parameters like COD/nitrogen (C/N) ratio, biofilm thickness and surface loading of oxygen, which significantly affect SND efficiency. High nitrogen removal efficiency (more than 70%) is attained at ranges of C/N ratio from 3.0 to 5.25 and of biofilm thickness from 600 to 1200 μm. In addition, it was clearly demonstrated that nitrogen removal not via nitrate but via nitrite could be achieved by controlling the relative surface loadings of oxygen and ammonia, supporting the feasibility of short-cut SND with MABs.

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