Experimental study of nitrite accumulation in
pre-denitrification biological nitrogen removal process

doi:10.1007/s11783-008-0008-x

Front.Environ.Sci.Eng.

2008, Vol. 2

Issue (2) : 236-240 https://doi.org/10.1007/s11783-008-0008-x

Experimental study of nitrite accumulation in pre-denitrification biological nitrogen removal process

WU Xuelei¹, CHEN Lunqiang¹, PENG Yongzhen¹, WANG Pu¹, WANG Yayi²

1.Key Laboratory of Beijing Water Environment Recovery, Beijing University of Technology; 2.School of Architectural Engineering, Zhejiang University of Technology;

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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.

Issue Date: 05 June 2008

Cite this article:

CHEN Lunqiang,WU Xuelei,PENG Yongzhen, et al. Experimental study of nitrite accumulation in pre-denitrification biological nitrogen removal process[J]. Front.Environ.Sci.Eng., 2008, 2(2): 236-240.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-008-0008-x
https://academic.hep.com.cn/fese/EN/Y2008/V2/I2/236

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