Three-dimensional immobilization of bacterial cells with a fibrous network and its application in a high-rate fixed-bed nitrifying bioreactor

Hiroshi Hayashi, Motomi Ono, Satoshi Tsuneda, Akira Hirata

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    A novel technique of immobilizing nitrifying bacteria using fibrous material, the three-dimensional immobilization with a fibrous network (3-D IFN), is proposed and its use in a high-rate nitrifying bioreactor is investigated. The fibrous carrier employed is ferro-nickel fibrous slag (FS), which is industrial solid waste from a ferro-nickel electrosmelting process. Since cell immobilization with FS is readily carried out within 90 seconds, this method is by far more rapid than any other cell immobilization techniques. A fixed-bed nitrifying reactor packed with cell-immobilizing FS is examined by both batch-mode and continuous feeding tests. By controlling the circulation flow rate, the transport of dissolved oxygen to the immobilized cells is improved, which is a distinct characteristic of this reactor. The continuous feeding test revealed that the ammonia removal rate of the reactor reached 6.5 kg-N/(m3-reactor)/d, which was extremely high compared with that of the conventional fixed-bed reactor for wastewater treatment. It is demonstrated that the 3-D IFN is a simple yet effective cell immobilization technique that can be successfully used in a high-rate nitrifying reactor.

    Original languageEnglish
    Pages (from-to)68-75
    Number of pages8
    JournalJournal of Chemical Engineering of Japan
    Volume35
    Issue number1
    DOIs
    Publication statusPublished - 2002 Jan

    Fingerprint

    Cell immobilization
    Bioreactors
    Slags
    Nickel
    Industrial wastes
    Solid wastes
    Dissolved oxygen
    Ammonia
    Wastewater treatment
    Bacteria
    Cells
    Flow rate

    Keywords

    • Bacterial cell immobilization
    • Biological wastewater treatment
    • Fibrous slag
    • Nitrification
    • Nitrifying bacteria

    ASJC Scopus subject areas

    • Chemical Engineering(all)

    Cite this

    Three-dimensional immobilization of bacterial cells with a fibrous network and its application in a high-rate fixed-bed nitrifying bioreactor. / Hayashi, Hiroshi; Ono, Motomi; Tsuneda, Satoshi; Hirata, Akira.

    In: Journal of Chemical Engineering of Japan, Vol. 35, No. 1, 01.2002, p. 68-75.

    Research output: Contribution to journalArticle

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