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Study on treating ammonia-nitrogen wastewater with catalytic oxidation of NaClO

Zhang Qifan;Li Yong;Xu Ting;Zhu Wei;School of Environmental Science & Engineering,Suzhou University of Science & Technology;  
N_2 and NO_3~- are the products of oxidizing ammonia-nitrogen with NaClO.The productivity of NO_3~- was 5% when treating 100 mg/L ammonia-nitrogen wastewater completely in the conditions of m(Cl_2)∶m(NH3)=7.7,pH=7 and normal temperature.Compared with other catalysts,Ni_2O_3 provided the best effect of catalytic oxidation of cutting reaction time and decreasing residual chlorine,but the removal rate of total nitrogen(TN)decreased.The reaction rate and NO_3~- productivity increased with the increasing of Ni_2O_3 dosage;The treating efficiency under high initial concentration was lower than that of low initial concentration;The reaction rate was accelerated when adding Ni_2O_3 but the NaClO needed in was unfavorable for catalytic oxidation direct oxidation cannot be cut down;The suitable pH was 7 under these experimental conditions;The NaClO′s self decomposition due to the high temperature.
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