Effects of acetate and nitrite addition on fraction of denitrifying phosphate-accumulating organisms and nutrient removal efficiency in anaerobic/aerobic/anoxic process

Koichi Soejima, Kazuma Oki, Akihiko Terada, Satoshi Tsuneda, Akira Hirata

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    The effects of acetate and nitrite on the performance of sequencing batch reactors (SBRs) employing an anaerobic/aerobic/anoxic (AOA) process were investigated. Three types of SBR operations were used: sodium acetate addition at the start of anoxic condition for heterotrophic denitrification (Type 1); sodium acetate addition at the start of aerobic condition for anoxic phosphate removal by denitrifying phosphate-accumulating organisms (DNPAOs) (Type 2: conventional AOA process); and nitrite addition at the start of aerobic condition for inhibition of phosphate-accumulating organisms (PAOs) (Type 3). A track experiment shows that Type 2 led to the best performance of SBRs among the three types. An analysis by fluorescence in situ hybridization (FISH) revealed that nitrite addition decreased the ratio of PAOs with a decrease in phosphorus removal efficiency. The fraction of DNPAOs in Type 2 was the highest at 13%, indicating that Type 2 is suitable for the simultaneous nitrogen and phosphorus removal in the AOA process.

    Original languageEnglish
    Pages (from-to)305-313
    Number of pages9
    JournalBioprocess and Biosystems Engineering
    Volume29
    Issue number5-6
    DOIs
    Publication statusPublished - 2006 Dec

    Fingerprint

    Nitrites
    Nutrients
    nitrite
    acetate
    Phosphates
    Acetates
    phosphate
    Batch reactors
    Food
    Sodium Acetate
    oxic conditions
    Phosphorus
    sodium
    phosphorus
    Sodium
    Denitrification
    Reactor operation
    anoxic conditions
    denitrification
    Fluorescence In Situ Hybridization

    Keywords

    • Anaerobic/aerobic/anoxic process (AOA process)
    • Denitrifying phosphate-accumulating organisms (DNPAOs)
    • Enhanced biological phosphorus removal (EBPR)
    • Glycogen-accumulating organisms (GAOs)
    • Sequencing batch reactor (SBR)

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Applied Microbiology and Biotechnology
    • Biotechnology
    • Bioengineering
    • Environmental Science (miscellaneous)

    Cite this

    Effects of acetate and nitrite addition on fraction of denitrifying phosphate-accumulating organisms and nutrient removal efficiency in anaerobic/aerobic/anoxic process. / Soejima, Koichi; Oki, Kazuma; Terada, Akihiko; Tsuneda, Satoshi; Hirata, Akira.

    In: Bioprocess and Biosystems Engineering, Vol. 29, No. 5-6, 12.2006, p. 305-313.

    Research output: Contribution to journalArticle

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