Laboratory batch experiments were conducted to investigate pH profiles during partial and complete denitrification with sufficient organic carbon source. Five stirred tank-type glass vessels, with a 7 L working volume for each, were used as SBR reactors that were all operated in denitrification mode. Five levels of initial proportion of nitrogen substances, i.e. nitrate and nitrite, were used in five reactors, respectively. Results showed that, at given temperature and mixed liquor suspended solids (MLSS), partial denitrification could attain a higher pH value than complete denitrification at the end of denitrification with the same initial NOx− concentration. The larger proportion the nitrite took in initial NOx− concentration, the higher pH peak would be obtained on pH profiles during denitrification despite the same total alkalinity produced. It was found that different types of alkalinity were produced during biological denitrification with different nitrogen substances. Partial denitrification could more carbonate alkalinity produce than complete denitrification. Furthermore, some characteristic points were identified on pH profiles which could indicate the disappearance of not only nitrate, but also nitrite in system. When computers are used to detect these features, they can provide rapid, real-time information, regarding the biological state of the system.
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Research Article|
May 01 2006
Effect of denitrification type on pH profiles in the sequencing batch reactor process
Yong-zhen Peng;
Yong-zhen Peng
1College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, China
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Wang Shao-po;
1College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, China
E-mail: wspfrd@hotmail.com
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Wang Shu-ying;
Wang Shu-ying
1College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, China
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Hu Jian-ge;
Hu Jian-ge
1College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, China
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Qiao Hai-Bing
Qiao Hai-Bing
1College of Environmental and Energy Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, China
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Water Sci Technol (2006) 53 (9): 87–93.
Citation
Yong-zhen Peng, Wang Shao-po, Wang Shu-ying, Hu Jian-ge, Qiao Hai-Bing; Effect of denitrification type on pH profiles in the sequencing batch reactor process. Water Sci Technol 1 May 2006; 53 (9): 87–93. doi: https://doi.org/10.2166/wst.2006.279
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