次氯酸钠催化氧化法处理氨氮废水的研究  

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

作　　者：章启帆 李勇[1] 徐婷[1] 朱伟 

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009

出　　处：《无机盐工业》2018年第1期52-56,共5页Inorganic Chemicals Industry

基　　金：江苏省环境科学与工程重点专业(类)建设项目(201223276);江苏省特色优势学科二期立项项目;2015年度研究生科研/实践创新计划项目(SKCX15_023)

摘　　要：次氯酸钠直接氧化氨氮的产物是氮气和硝酸根,在m(氯气)∶m(氨气)=7.7、pH=7、常温下完全处理100 mg/L的氨氮废水,硝酸根生成率为5%。通过比较,三氧化二镍有较好的催化效果,可大幅缩短反应时间并减少余氯,但总氮(TN)的去除率下降。催化氧化下三氧化二镍投加量越大,反应速度越快,硝酸根生成越多;处理高初始浓度氨氮废水的效率较低初始浓度低;投加三氧化二镍能加快反应速率但无法减少直接氧化下所需次氯酸钠的用量;本实验条件下最适宜pH为7;温度的升高导致次氯酸钠自分解不利于催化氧化的进行。N2 and NO3^- are the products of oxidizing ammonia-nitrogen with NaClO.The productivity of NO3^- was 5% when treating 100 mg/L ammonia-nitrogen wastewater completely in the conditions of m（Cl2）∶m（NH3）=7.7,pH=7 and normal temperature.Compared with other catalysts,Ni2O3 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 NO3^- productivity increased with the increasing of Ni2O3 dosage;The treating efficiency under high initial concentration was lower than that of low initial concentration;The reaction rate was accelerated when adding Ni2O3 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.

关 键 词：催化氧化 次氯酸钠 氨氮 金属氧化物 

分 类 号：TQ126.2[化学工程—无机化工]