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

Xianping Luo, Qun Yan, Chunying Wang, Caigui Luo, Nana Zhou and Chensheng Jian
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Xianping Luo: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Qun Yan: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Chunying Wang: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Caigui Luo: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Nana Zhou: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Chensheng Jian: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

IJERPH, 2015, vol. 12, issue 9, 1-13

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 NO 3 ? -N, less into NO 2 ? -N, not into N 2 .

Keywords: ammonia nitrogen wastewater; ozone oxidation; mechanism (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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