Metabolic behavior of denitrifying phosphate-accumulating organisms under nitrate and nitrite electron acceptor conditions

Johwan Ahn, Tomotaka Daidou, Satoshi Tsuneda, Akira Hirata

    Research output: Contribution to journalArticle

    74 Citations (Scopus)

    Abstract

    The effects of various types of electron acceptors on anoxic phosphorus uptake were investigated in detail to obtain a better insight into the metabolic behavior of denitrifying phosphate-accumulating organisms. Batch experimental tests under three different electron acceptor conditions, i.e., nitrate, nitrite and mixtures of nitrate and nitrite, were carried out using activated sludge cultivated in a sequencing batch reactor. The experimental results confirmed no inhibition of the utilization of nitrate or nitrite as an electron acceptor for anoxic phosphorus uptake. Anoxic phosphorus uptake occurred provided there was an electron acceptor present regardless of whether it was nitrate or nitrite. However, for nitrite a relatively small amount of anoxic phosphorus was taken up per nitrogen denitrified compared to nitrate. On the other hand, the amount of anoxic phosphorus taken up per nitrogen denitrified increased with an increase in the initial loading amount of electron acceptor in the case of nitrate, whereas it slightly decreased nitrite. Moreover, the amount of phosphorus taken up per nitrogen denitrified decreased with increasing mixed liquor suspended solid (MLSS) concentration in the case of nitrate, while it slightly increased for nitrite. From these results, it was confirmed that the activity of anoxic phosphorus uptake is strongly associated with the type and the initial loading amount of electron acceptor and the MLSS concentration under anoxic conditions.

    Original languageEnglish
    Pages (from-to)442-446
    Number of pages5
    JournalJournal of Bioscience and Bioengineering
    Volume92
    Issue number5
    DOIs
    Publication statusPublished - 2001

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    Nitrites
    Nitrates
    Phosphorus
    Phosphates
    Electrons
    Nitrogen
    Batch reactors
    Sewage

    Keywords

    • Anoxic phosphorus uptake
    • Biological nutrient removal
    • Denitrifying phosphate-accumulating organisms
    • Electron acceptor
    • Enhanced biological phosphorus removal

    ASJC Scopus subject areas

    • Biotechnology
    • Bioengineering

    Cite this

    Metabolic behavior of denitrifying phosphate-accumulating organisms under nitrate and nitrite electron acceptor conditions. / Ahn, Johwan; Daidou, Tomotaka; Tsuneda, Satoshi; Hirata, Akira.

    In: Journal of Bioscience and Bioengineering, Vol. 92, No. 5, 2001, p. 442-446.

    Research output: Contribution to journalArticle

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