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Int. J. Environ. Res. Public Health 2015, 12(9), 11975-11987; doi:10.3390/ijerph120911975

Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization

1,2,3,* , 1,3
,
1,2,3
,
1,3
,
1,3
and
1,3
1
School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2
Western Mining Co., Ltd., Xining 810006, Qinghai, China
3
Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 9 July 2015 / Accepted: 18 September 2015 / Published: 23 September 2015
View Full-Text   |   Download PDF [742 KB, uploaded 24 September 2015]   |  

Abstract

Ammonia nitrogen wastewater (about 100 mg/L) was treated by two-stage ozone oxidation method. The effects of ozone flow rate and initial pH on ammonia removal were studied, and the mechanism of ammonia nitrogen removal by ozone oxidation was discussed. After the primary stage of ozone oxidation, the ammonia removal efficiency reached 59.32% and pH decreased to 6.63 under conditions of 1 L/min ozone flow rate and initial pH 11. Then, the removal efficiency could be over 85% (the left ammonia concentration was lower than 15 mg/L) after the second stage, which means the wastewater could have met the national discharge standards of China. Besides, the mechanism of ammonia removal by ozone oxidation was proposed by detecting the products of the oxidation: ozone oxidation directly and ·OH oxidation; ammonia was mainly transformed into NO3-N, less into NO2-N, not into N2. View Full-Text
Keywords: ammonia nitrogen wastewater; ozone oxidation; mechanism ammonia nitrogen wastewater; ozone oxidation; mechanism
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Luo, X.; Yan, Q.; Wang, C.; Luo, C.; Zhou, N.; Jian, C. Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization. Int. J. Environ. Res. Public Health 2015, 12, 11975-11987.

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