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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/5888

    Title: Effect of recycle-to-influent ratio on activities of nitrifiers and denitrifiers in a combined UASB–activated sludge reactor system
    Authors: Ju-Sheng Huang (黃汝賢)
    Hsin-Hsien Chou
    Chih-Ming Chen
    Chun-Mao Chiang
    Keywords: Combined reactor system
    Recycle-to-influent ratio
    Activities of nitrifiers and denitrifiers
    Piggery wastewater
    Date: 2007-03-06
    Issue Date: 2009-11-20 12:11:37 (UTC+8)
    Abstract: A laboratory study using a combined upflow anaerobic sludge bed (UASB)–activated sludge (AS) reactor system was undertaken to
    explore the effect of recycle-to-influent ratio (Re = 1, 2, and 3) on the activities of nitrifiers and denitrifiers. Suspended-solids pre-settled
    piggery wastewater was used as the substrate-feed wastewater. At the Re of 1–3, the combined reactor system achieved efficient removal
    of COD (96–97%), TKN (100%) and total nitrogen TN (54–77%). Methanogenesis occurred with nearly-complete denitrification in the
    UASB reactor, whereas complete nitrification took place in the AS reactor. A higher Re (i.e., accompanied with a shorter solids retention
    time) resulted in a larger amount of high-activity denitrifiers and thereby achieved a higher TN removal efficiency. Compact granules
    and a high biomass concentration in the UASB reactor were observed. At the Re of 1–3, the maximum specific reaction rate of nitrifiers
    (0.45–0.49 NHþ4
    -N mg VSS1 d1) and the specific nitrification rates of mixed culture (0.18–0.22 mg NHþ4
    -N mg VSS1 d1) in the AS
    reactor varied slightly; whereas the maximum specific reaction rate of denitrifiers (0.18–0.27 mg NOx -N mg VSS1 d1) and the specific
    denitrification and COD removal rates of mixed culture (0.025–0.050 mg NOx -N mg VSS1 d1; 0.24–0.31 mg COD mg VSS1 d1) in
    the UASB reactor increased with increasing Re. The primary finding of the study is that the combined UASB–AS reactor system should
    be operated at a higher Re to maintain high-activity denitrifiers to remove organic materials and nitrogen from piggery wastewater.
    Relation: Chemosphere 68 (2007) 382–388
    Appears in Collections:[環境工程系所] 期刊論文

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