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  • fate and effect of benzalkonium chlorides in a continuous-flow biological nitrogen removal system treating poultry processing wastewater

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 529
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     quaternary ammonium compounds (qacs) are used for sanitation in many poultry processing facilities. this work investigated the fate and effect of a mixture of benzalkonium chlorides (bacs), a class of qacs widely used in commercial antimicrobial formulations, on the biological nitrogen removal (bnr) processes. a laboratory-scale bnr system was operated continuously for 670 days, fed with poultry processing wastewater amended with a mixture of bacs. initially, the nitrogen removal efficiency deteriorated at a bac feed concentration of 5 mg/l due to the complete inhibition of nitrification. however, after 27 days of operation, the system recovered and achieved 100% ammonia removal. high nitrogen removal efficiency was achieved even after the feed bac concentration was stepwise increased up to120 mg/l. batch nitrification assays performed before, during, and after bac exposure, showed that rapid microbial acclimation and bac biodegradation contributed to the recovery of nitrification achieving efficient and stable long-term bnr system operation.

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