摘要
水体中的氨氮以游离态NH_(3)−N和铵盐态氮NH_(4)^(+)−N两种形式存在。环保对氨氮废水排放控制越来越严格,因此去除水中的氨氮研究日益引起关注。与传统的活性污泥法去除废水中的氨氮相比,以次氯酸钠为氧化剂,不仅使用安全无氯气外泄的危险,而且具有运行方便,操作简单,反应速度快等特点,能够减少其他废物的产生,对水体有消毒作用。对质量浓度为20 mg/L的氨氮废水进行模拟处理试验,通过单因素试验,研究了氨氮对次氯酸钠的投加量,不同温度、pH值及停留时间去除效果的影响,结果表明,次氯酸钠浓度为10%;控制pH值7~9;温度20~25℃;反应时间30 min,次氯酸钠去除水中氨氮可达到95%以上,废水可达标排放,适用于各类废水处理。
Ammonia nitrogen in water body exists in the form of free NH_(3)-N and ammonium nitrogen NH_(4)^(+)-N.Environmental protection is more and more strict on the control of ammonia nitrogen wastewater discharge,so the research on the removal of ammonia nitrogen in water has attracted more and more attention.Compared with the traditional activated sludge process to remove ammonia nitrogen in wastewater,using sodium hypochlorite as oxidant,it is not only safe to use without the risk of chlo⁃rine leakage,but also has the characteristics of convenient operation,simple operation and fast reaction speed,which can re⁃duce the generation of other wastes and has disinfection effect on water body.Through single factor test,simulated treatment of ammonia nitrogen wastewater with mass concentration of 20 mg/L was carried out,and the effects of ammonia nitrogen on the dosage of sodium hypochlorite,as well as the removal effect of different temperature,pH value and residence time were stud⁃ied.The results show that when the concentration of sodium hypochlorite is 10%,the pH value is 7~9,the temperature is 20~25℃and the reaction time is 30 min,the removal rate of ammonia nitrogen in water by sodium hypochlorite can reach more than 95%,and the wastewater can meet the discharge standard,which is suitable for all kinds of wastewater treatment.
作者
闫伟
刘琦
王磊
YAN Wei;LIU Qi;WANG Lei(Shaanxi Yanchang Petroleum Balasu Coal Industry Co.,Ltd.,Yulin 719000,China)
出处
《陕西煤炭》
2021年第S02期38-41,共4页
Shaanxi Coal
关键词
氨氮
次氯酸钠
去除效果
加药量
ammonia nitrogen
sodium hypochlorite
removal effect
dosage
