摘要
用内蒙膨润土及其碱改性膨润土进行模拟氨氮废水的脱氮实验研究。结果表明,在氨氮溶液初始浓度为300 mg/L,pH值为3.0～7.0时,相对于天然膨润土,碱改性膨润土对氨氮的吸附量有了很大提高,其吸附等温线符合Freundlich和Langmuir方程,且对氨氮的吸附动力学符合准一级和准二级吸附动力学模型,说明化学吸附和物理吸附共同起作用;在应用于畜禽废水处理中,碱改性膨润土对氨氮去除率达到91.0%。
The adsorption of ammonia nitrogen in waste water on natural bentonite and modified bentonite,collected from Inner Mongolia was discussed.Results showed that the maximum adsorption capacity of modified bentonite was observed at pH 3.0~7.0 when the initial concentration of ammonia nitrogen was 300 mg/L.The ammonia nitrogen adsorption data on modified bentonite were well fitted by Langmuir and Freundlich isotherm.The ammonia nitrogen adsorption dynamics can be best described by the pseudo first-order and second-order model,chemical and physical adsorption predominated its adsorption process.Modified bentonite can remove ammonia nitrogen in domestic farming waste water with the efficiency of 91.0%.
出处
《应用化工》
CAS
CSCD
2011年第7期1148-1152,共5页
Applied Chemical Industry
基金
江苏省科技攻关项目(BE2006371)
关键词
膨润土
氨氮
吸附作用
改性
bentonit
ammonia nitrogen
adsorption
modification
