Feasibility of a membrane-aerated biofilm reactor to achieve controllable nitrification

A. Terada, T. Yamamoto, R. Igarashi, Satoshi Tsuneda, A. Hirata

    Research output: Contribution to journalArticle

    59 Citations (Scopus)

    Abstract

    A feasibility of a membrane-aerated biofilm reactor (MABR) for controllable nitrification was examined. The estimation of oxygen supply rate (OSR) with three polyacrylonitrile membrane modules revealed that specific OSR was equivalent in these membrane modules and OSR affected only air pressure, thus enabling control of aeration simply by adjustment of air pressure. A continuous nitrification experiment consisting of three reactors differing in membrane surface area investigated the reactor performance of the MABR at an air pressure of 23 kPa. The results indicated that the ammonia removal rate at steady state was dependent on membrane surface area, at rates nearly equivalent to that predicted by the above OSR experiment. The amount of bacteria adhering to the membrane surface was not completely proportional to membrane surface area due to clogging in a reactor with high membrane surface area, which accompanies a decrease in specific ammonia removal rate per biomass with membrane surface area. Stable ammonia removal rates at air pressures of 23, 45 and 100 kPa corresponded to the predicted values from the OSR experiment. Further, more than 80% oxygen utilization efficiency (OUE) was achieved under all operational conditions, indicating effective oxygen uptake by nitrifying bacteria under oxygen-depleted conditions. Based on these experiments, the MABR was shown to be a controllable nitrification system, and to be able to provide a reaction space for nitrification in a membrane-attached biofilm without altering the bulk conditions.

    Original languageEnglish
    Pages (from-to)123-130
    Number of pages8
    JournalBiochemical Engineering Journal
    Volume28
    Issue number2
    DOIs
    Publication statusPublished - 2006 Feb 15

    Fingerprint

    Nitrification
    Biofilms
    Membranes
    Oxygen supply
    Oxygen
    Air Pressure
    Ammonia
    Air
    Bacteria
    Experiments
    Polyacrylonitriles
    Biomass

    Keywords

    • Membrane-aerated biofilm reactor (MABR)
    • Nitrification
    • Oxygen supply rate (OSR)
    • Oxygen utilization efficiency (OUE)
    • Oxygen-depleted conditions

    ASJC Scopus subject areas

    • Biotechnology
    • Bioengineering
    • Chemical Engineering(all)

    Cite this

    Feasibility of a membrane-aerated biofilm reactor to achieve controllable nitrification. / Terada, A.; Yamamoto, T.; Igarashi, R.; Tsuneda, Satoshi; Hirata, A.

    In: Biochemical Engineering Journal, Vol. 28, No. 2, 15.02.2006, p. 123-130.

    Research output: Contribution to journalArticle

    Terada, A. ; Yamamoto, T. ; Igarashi, R. ; Tsuneda, Satoshi ; Hirata, A. / Feasibility of a membrane-aerated biofilm reactor to achieve controllable nitrification. In: Biochemical Engineering Journal. 2006 ; Vol. 28, No. 2. pp. 123-130.
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