Real-time control strategy for simultaneous nitrogen and phosphorus removal using aerobic granular sludge

N. Kishida, Satoshi Tsuneda, yutaka Sakakibara, J. H. Kim, R. Sudo

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    To achieve stable and simultaneous removal of nitrogen and phosphorus using aerobic granular sludge in a sequencing batch reactor, a real-time control strategy was established, where time derivatives of electric conductivity (EC) and pH were monitored to facilitate the determinations of ends of phosphate release, nitrification and denitrification as well as corresponding optimum time-lengths of anaerobic, oxic, and anoxic phases in treatment cycles. Although biomass concentration in a reactor drastically fluctuated at the startup period because of very short sludge settling time for the formation of aerobic granular sludge, cycle length for proper treatment was automatically adjusted in this control system. Even when characteristics of influent wastewater markedly fluctuated, stable nitrogen and phosphorus removal was successfully attained both before and at pseudo-steady-state. Effluent concentrations of NH 4-N, NOx-N and PO4-P were always lower than 0.3 mg/L. On the other hand, when time lengths of the anaerobic/oxic/anoxic phases were fixed, stable nitrogen and phosphorus removal was not accomplished. Therefore, it is clear that the designed control system is very effective to obtain stable treatment performance in simultaneous nitrogen and phosphorus removal by aerobic granular sludge.

    Original languageEnglish
    Pages (from-to)445-450
    Number of pages6
    JournalWater Science and Technology
    Volume58
    Issue number2
    DOIs
    Publication statusPublished - 2008

    Fingerprint

    Real time control
    Phosphorus
    sludge
    phosphorus
    Nitrogen
    nitrogen
    control system
    Control systems
    Nitrification
    Denitrification
    Batch reactors
    nitrification
    denitrification
    Effluents
    Phosphates
    Biomass
    Wastewater
    conductivity
    phosphate
    effluent

    Keywords

    • Aerobic granular sludge
    • Electric conductivity (EC)
    • Nitrogen removal
    • PH
    • Phosphorus removal
    • Real-time control

    ASJC Scopus subject areas

    • Environmental Engineering
    • Water Science and Technology

    Cite this

    Real-time control strategy for simultaneous nitrogen and phosphorus removal using aerobic granular sludge. / Kishida, N.; Tsuneda, Satoshi; Sakakibara, yutaka; Kim, J. H.; Sudo, R.

    In: Water Science and Technology, Vol. 58, No. 2, 2008, p. 445-450.

    Research output: Contribution to journalArticle

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