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  • biological nutrient removal by applying modified four step-feed technology to treat weak wastewater

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 536
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     for weak municipal wastewater (cod ⩽ 200 mg l−1, nh4+-n ⩽ 40 mg l−1) with low influent c/n, a pilot modified four step-feed process was applied for simultaneous biological nitrogen (n) and phosphorus (p) removal under different inflow distribution ratios. it was designed with a short hydraulic retention time of 8.7 h to raise influent load, and the optimal effluent performance of cod, nh4+-n, total nitrogen (tn) and total phosphorus (tp) were 33.05, 0.58, 9.26 and 0.46 mg l−1, respectively with inflow distribution ratio of 20:35:35:10%. more than 74% of carbon sources were utilized effectively for phosphorus release and denitrification. about 16.7% of tn was removed through simultaneous nitrification and denitrification in oxic zones. moreover, the commendable sludge settling with a sludge loading of 0.04–0.1 kg cod/kg mlss d, attributed to the higher mixed liquor suspended solids (mlss) and the alternating anoxic/oxic operational mode. in addition, the pre-anoxic zone designed was beneficial for both nitrate reduction and anaerobic phosphorus release.

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