Many studies suggest that the total nitrogen (TN) in urine is around 9,000 mg/L and about 80% of nitrogen in municipal wastewater comes from urine, because nitrogen mainly occurs in the form of urea in fresh human urine. Based on this fact, the study on the migration and transformation law of nitrogen in urine and its influencing factors was carried out. It can be seen from the experimental results that the transformation rate of urea in urine into ammonia nitrogen after standing for 20 days is only about 18.2%, but the urea in urine can be hydrolyzed into ammonia nitrogen rapidly after it is catalyzed directly with free urease or indirectly with microorganism. Adding respectively a certain amount of urease, activated sludge and septic-tank sludge to urine samples can make the maximum transformation rate achieve 85% after 1 day, 2 days and 6 days, respectively. In combination with some corresponding treatment methods, recycling of nitrogen in urine can be achieved. The results are of great significance in guiding denitrification in municipal wastewater treatment.
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Research Article|
September 01 2013
A study on the migration and transformation law of nitrogen in urine in municipal wastewater transportation and treatment
Ren Wuang;
1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, 710055, China
E-mail: [email protected]
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Jin Pengkang;
Jin Pengkang
1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, 710055, China
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Liang Chenggang;
Liang Chenggang
1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, 710055, China
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Wang Xiaochang;
Wang Xiaochang
1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, 710055, China
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Zhang Lei
Zhang Lei
1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, 710055, China
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Water Sci Technol (2013) 68 (5): 1072–1078.
Article history
Received:
November 22 2012
Accepted:
April 15 2013
Citation
Ren Wuang, Jin Pengkang, Liang Chenggang, Wang Xiaochang, Zhang Lei; A study on the migration and transformation law of nitrogen in urine in municipal wastewater transportation and treatment. Water Sci Technol 1 September 2013; 68 (5): 1072–1078. doi: https://doi.org/10.2166/wst.2013.336
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