title: Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization.
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.
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. lxp9491@163.com.|Western Mining Co., Ltd., Xining 810006, Qinghai, China. lxp9491@163.com.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. lxp9491@163.com.
authors.forename: Xianping
authors.initials: X
authors.lastname: Luo
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. yanqun8219893@163.com.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. yanqun8219893@163.com.
authors.forename: Qun
authors.initials: Q
authors.lastname: Yan
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. cywang@jxust.edu.cn.|Western Mining Co., Ltd., Xining 810006, Qinghai, China. cywang@jxust.edu.cn.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. cywang@jxust.edu.cn.
authors.forename: Chunying
authors.initials: C
authors.lastname: Wang
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. andk24@163.com.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. andk24@163.com.
authors.forename: Caigui
authors.initials: C
authors.lastname: Luo
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. hdongxue@163.com.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. hdongxue@163.com.
authors.forename: Nana
authors.initials: N
authors.lastname: Zhou
authors.affiliation: School of Resuorces and Environmental Engieering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. gctao@163.com.|Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China. gctao@163.com.
authors.forename: Chensheng
authors.initials: C
authors.lastname: Jian
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002681:China; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000032:analysis; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*
chemical_list: D000641:Ammonia; D009584:Nitrogen; D010126:Ozone; D062065:Wastewater
keywords: ammonia nitrogen wastewater; mechanism; ozone oxidation