摘要
采用介质阻挡放电(DBD)协同合成沸石组合工艺处理氨氮废水,考察溶液初始质量浓度、沸石投加量、沸石粒径、溶液初始pH、共存阳离子等因素对氨氮去除效果的影响,研究沸石循环利用性能及协同处理机制。结果表明:初始质量浓度100 mg/L模拟氨氮废水,250～380μm的沸石投加量为10 g/L,放电间距0 mm,DBD协同处理20 min,氨氮去除率可达95. 58%。溶液初始质量浓度低、初始pH呈弱碱性均有利于氨氮的去除。共存阳离子对氨氮有竞争吸附,3种金属阳离子对氨氮去除影响由强到弱的顺序为Mg^(2+)、K^+、Na^+。DBD放电过程中对沸石有一定的再生效果,两者表现了出良好的协同去除氨氮作用。
Dielectric barrier discharge( DBD) combined with synthetic zeolite was proposed as a new treatment way for the removal of aqueous ammonia nitrogen. The effects of initial ammonium ion concentration,zeolite dosage,particle size of zeolite,initial pH of the solutions,and competitive cations on the removal efficiency were investigated by batch experiments.The mechanism of improving the ammonia nitrogen removal in the synergistic treatment system was discussed. Results showed that ammonium removal efficiency was reached 95. 58% with optimal conditions of initial ammonium concentration of 100 mg/L,250-380 μm zeolite dosage of 10 g/L,discharge distance of 0 mm,and treatment time of 20 min.As the initial concentration of ammonia decreased,the removal efficiency increased. The optimal initial pH value was 8. 5. Coexistence cations affected ammonium removal sequence was Mg2+,K+ and Na+. DBD discharge regenerated the zeolite,which showed a fine synergistic effect on ammonia nitrogen removal.
作者
杨宸伟
武海霞
刘峰
陈卫刚
姚锐
YANG Chenwei;WU Haixia;LIU Feng;CHEN Weigang;YAO Rui(College of Urban Construction,Nanjing Tech University,Nanjing 211800,China;College of Automation and Electrical Engineering,Nanjing Tech University,Nanjing 211800,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2019年第2期239-245,共7页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学青年基金(51707093)
国家自然科学基金(51777091)
关键词
氨氮废水
合成沸石
介质阻挡放电
非平衡等离子体
aqueous ammonia nitrogen
artificial zeolite
dielectric barrier discharge
non-thermal plasma
