Evaluation of sludge reduction and phosphorus recovery efficiencies in a new advanced wastewater treatment system using denitrifying polyphosphate accumulating organisms

Y. Suzuki, T. Kondo, K. Nakagawa, Satoshi Tsuneda, A. Hirata, Yasutoshi Shimizu, Y. Inamori

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    A new biological nutrient removal process, anaerobic-oxic-anoxic (A/O/A) system using denitrifying polyphosphate-accumulating organisms (DNPAOs), was proposed. To attain excess sludge reduction and phosphorus recovery, the A/O/A system equipped with ozonation tank and phosphorus adsorption column was operated for 92 days, and water quality of the effluent, sludge reduction efficiency, and phosphorus recovery efficiency were evaluated. As a result, TOC, T-N and T-P removal efficiency were 85%, 70% and 85%, respectively, throughout the operating period. These slightly lower removal efficiencies than conventional anaerobic-anoxic-oxic (A/A/O) processes were due to the unexpected microbial population in this system where DNPAOs were not the dominant group but normal polyphosphate-accumulating organisms (PAOs) that could not utilize nitrate and nitrite as electron acceptor became dominant. However, it was successfully demonstrated that 34-127% of sludge reduction and around 80% of phosphorus recovery were attained. In conclusion, the A/O/A system equipped with ozonation and phosphorus adsorption systems is useful as a new advanced wastewater treatment plant (WWTP) to resolve the problems of increasing excess sludge and depleted phosphorus.

    Original languageEnglish
    Pages (from-to)107-113
    Number of pages7
    JournalWater Science and Technology
    Volume53
    Issue number6
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Wastewater treatment
    Phosphorus
    sludge
    phosphorus
    Recovery
    Ozonization
    adsorption
    Adsorption
    Sewage sludge
    Nutrients
    nitrite
    Water quality
    evaluation
    wastewater treatment
    organism
    Effluents
    Nitrates
    effluent
    nitrate
    water quality

    Keywords

    • Anaerobic-oxic-anoxic (A/O/A) system
    • Denitrifying polyphosphate-accumulating organisms (DNPAOs)
    • Excess sludge reduction
    • Ozonation
    • Phosphorus recovery
    • Zirconium ferrite adsorbent

    ASJC Scopus subject areas

    • Water Science and Technology

    Cite this

    Evaluation of sludge reduction and phosphorus recovery efficiencies in a new advanced wastewater treatment system using denitrifying polyphosphate accumulating organisms. / Suzuki, Y.; Kondo, T.; Nakagawa, K.; Tsuneda, Satoshi; Hirata, A.; Shimizu, Yasutoshi; Inamori, Y.

    In: Water Science and Technology, Vol. 53, No. 6, 2006, p. 107-113.

    Research output: Contribution to journalArticle

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