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  • anammox sludge immobilized in polyvinyl alcohol (pva) cryogel carriers

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 505
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this study evaluated the use of pva cryogels to encapsulate slow-growing anammox bacteria for deammonification treatment of wastewater. the cryogel pellets were prepared by freezing-thawing at −8 °c. on average, pellets contained 11.8 mg-tss/g-pellet of enriched anammox sludge nrrl b-50286 (candidatus brocadia caroliniensis) in 4-mm cubes. they were tested with synthetic and partially nitrified swine wastewater using continuous stirred-tank reactors packed at 20% (w/v). the immobilized gel was retained inside the reactor by a screen that eliminated the need of sludge recycling. the stoichiometry of anammox reaction was maintained for more than 5 months under non-sterile conditions. the process was not limited by substrates availability unless quite low n concentration (<5 mg/l) achieving >93% removal efficiency. in mass balances, >80% of the potential n conversion activity was achieved (2920 mg-n/kg-pellet/d). in addition, the immobilized bacteria were resilient to inhibition at high nitrite concentrations (244–270 mg-n/l).

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