Efficient COD removal and nitrification in an upflow microaerobic sludge blanket reactor for domestic wastewater |
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Authors: | Shaokui Zheng Cancan Cui |
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Institution: | (1) MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China |
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Abstract: | The treatment performance of an upflow microaerobic sludge blanket reactor (UMSB) for synthetic domestic wastewater was investigated
at two dissolved oxygen (DO) levels, 0.3–0.5 and 0.7–0.9 mg l−1, focusing on nitrification performance. The higher DO level induced complete nitrification of ammonia nitrogen (NH3–N), achieving chemical oxygen demand and NH3–N removals of 97 and 92%, respectively. There were consistently significantly higher nitrate nitrogen (NO3–N) and nitrite nitrogen (NO2–N) levels in the effluent, with ~66% of newly-produced oxidised nitrogen as NO2–N. Despite the high nitrification efficiency, only about 23% of the removed NH3–N amount from the influent was ultimately transformed into oxidised nitrogen due to the simultaneous nitrification-denitrification.
Sludge blanket development and granulation occurred simultaneously in the UMSB. |
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