Novel nitritation process using heat-shocked nitrifying bacteria entrapped in gel carriers

Kazuichi Isaka, Tatsuo Sumino, Satoshi Tsuneda

    研究成果: Article

    25 引用 (Scopus)

    抄録

    Nitritation (ammonium being oxidized to nitrite) is a cost-effective method for treating wastewater having high ammonium concentrations or low C/N ratios. We developed a novel nitritation process based on the observation that nitrite-oxidizing bacteria (NOB) in sewage sludge can be killed by heat shock, but ammonium-oxidizing bacteria (AOB) may survive. The effects of maximum heat-shock temperature and heat-shock duration on populations of AOB and NOB in gel carriers were measured. No NOB were detected after a heat-shock treatment higher than 60 °C for 20 min. However, the population of AOB continued to exist at above 108 MPN/mL-carrier even after heat shock at 80 °C for 1 h. To evaluate the nitritation performance, continuous feeding tests were conducted using heat-shocked gel carriers treated at three temperatures. Stable nitritation was observed for 49 days when gel carriers were heat shocked at 60-90 °C for 1 h. However, because nitrate production, i.e., nitratation, was observed after 77 days, the gel carriers were heat shocked again. Consequently, nitratation stopped immediately and nitritation restarted after 14 days. These results clearly show that this technique is effective for suppressing nitratation.

    元の言語English
    ページ(範囲)265-270
    ページ数6
    ジャーナルProcess Biochemistry
    43
    発行部数3
    DOI
    出版物ステータスPublished - 2008 3

    Fingerprint

    Bacteria
    Gels
    Hot Temperature
    Ammonium Compounds
    Shock
    Nitrites
    Sewage
    Temperature
    Sewage sludge
    Waste Water
    Nitrates
    Population
    Wastewater
    Costs and Cost Analysis
    Costs

    ASJC Scopus subject areas

    • Biochemistry
    • Organic Chemistry
    • Engineering (miscellaneous)
    • Industrial and Manufacturing Engineering

    これを引用

    Novel nitritation process using heat-shocked nitrifying bacteria entrapped in gel carriers. / Isaka, Kazuichi; Sumino, Tatsuo; Tsuneda, Satoshi.

    :: Process Biochemistry, 巻 43, 番号 3, 03.2008, p. 265-270.

    研究成果: Article

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