It was occasionally found that a significant nitrogen loss in solution under neutral pH value in a sequencing batch reactor with a single-stage oxic process using synthetic wastewater, and then further studies were to verify the phenomenon of nitrogen loss and to investigate the pathway of nitrogen removal. The result showed that good performance of nitrogen removal was obtained in system. 0–7.28 mg L−1 ammonia, 0.08–0.38 mg L−1 nitrite and 0.94–2.12 mg L−1 nitrate were determined in effluent, respectively, when 29.85–35.65 mg L−1 ammonia was feeding as the sole nitrogen source in influent. Furthermore, a substantial nitrogen loss in solution (95% of nitrogen influent) coupled with a little gaseous nitrogen increase in off-gas (7% of nitrogen influent) was determined during a typical aerobic phase. In addition, about 322 mg nitrogen accumulation (84% of nitrogen influent) was detected in activated sludge. Based on nitrogen mass balance calculation, the unaccounted nitrogen fraction and the ratio of nitrogen accumulation in sludge/nitrogen loss in solution were 14.6 mg (3.7% of nitrogen influent) and 0.89, respectively. The facts indicated that the essential pathway of nitrogen loss in solution in this study was excess nitrogen accumulation in activated sludge.
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Research Article|
February 01 2009
Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process
Xiao-ming Li;
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
E-mail: wwyy44339745@yahoo.com.cn
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Dong-bo Wang;
Dong-bo Wang
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Qi Yang;
Qi Yang
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Wei Zheng;
Wei Zheng
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Jian-bin Cao;
Jian-bin Cao
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Xiu Yue;
Xiu Yue
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Ting-ting Shen;
Ting-ting Shen
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Guang-ming Zeng;
Guang-ming Zeng
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Jiu-hua Deng
Jiu-hua Deng
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, People's Republic China
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Water Sci Technol (2009) 59 (3): 573–582.
Citation
Xiao-ming Li, Dong-bo Wang, Qi Yang, Wei Zheng, Jian-bin Cao, Xiu Yue, Ting-ting Shen, Guang-ming Zeng, Jiu-hua Deng; Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process. Water Sci Technol 1 February 2009; 59 (3): 573–582. doi: https://doi.org/10.2166/wst.2009.003
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