Experimental study of nitrite accumulation in predenitrification biological nitrogen removal process |
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Authors: | Xuelei Wu Lunqiang Chen Yongzhen Peng Yayi Wang and Pu Wang |
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Institution: | (1) Key Laboratory of Beijing Water Environment Recovery, Beijing University of Technology, Beijing, 100022, China;(2) School of Architectural Engineering, Zhejiang University of Technology, Hangzhou, 310014, China |
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Abstract: | The effect of dissolved oxygen (DO) concentration on nitrite accumulation was investigated in a pilot-scale pre-denitrification
process at room temperature for 100 days. In the first 10 days, due to the instability of the system, the DO concentration
fluctuated between 1.0 and 2.0 mg/L. In the next 14 days, the DO concentration was kept at 0.5 mg/L and nitrite accumulation
occurred, with the average nitrite accumulation rate at 91%. From the 25th day, the DO concentration was increased to 2.0
mg/L to destroy the nitrite accumulation, but nitrite accumulation rate was still as high as 90%. From the 38th day the nitrite
accumulation rate decreased to 15%–30% linearly. From the 50th day, DO concentration was decreased to 0.5 mg/L to resume nitrite
accumulation. Until the 83rd day the nitrite accumulation rate began to increase to 80%. Dissolved oxygen was the main cause
of nitrite accumulation, taking into account other factors such as pH, free ammonia concentration, temperature, and sludge
retention time. Because of the different affinity for oxygen between nitrite oxidizing bacteria and ammonia oxidizing bacteria
when DO concentration was kept at 0.5 mg/L, nitrite accumulation occurred.
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Translated from Environmental Science, 2006, 27(12): 2472–2476 译自: 环境科学] |
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Keywords: | pre-denitrification biological nitrogen removal nitrite accumulation dissolved oxygen |
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