摘要
针对二级出水中氮含量较高问题,为降低市政污水二级出水中氨氮的含量,结合国内外相关研究,采用吸附法去除水中的氨氮,对天然吸附剂沸石进行盐热改性处理。结果表明,经过盐热改性后的沸石脱氮能力提高了37.12%,其最佳的改性条件:质量浓度百分数2.0%的NaCl浸渍2h,焙烧温度500℃,焙烧时间0.5h。根据试验数据绘制了盐热改性沸石脱氮的吸附等温线,盐热改性沸石吸附氨氮的等温线较好的符合Freundlich等温线模型。与幂函数相比,叶洛维奇吸附动力学方程能更好的阐明盐热改性沸石在脱氮过程中的吸附机理。通过对材料进行的扫描电镜对比测试分析,可知在制备过程中改变了沸石表面形貌,沸石孔结构得到了充分扩展,微观孔径大小和形状均发生了变化;同时通过EDS分析,可知材料在制备前后其组成成分也发生了相应的变化。
To solve the problem of the high concentration of NH4＋-N in secondary effluent and how to reduce it, Tried to remove NH4＋-N using adsorption process when considered relevant researches home and abroad. Modified the nature zeolites by salt thermal. As was shown in the results, after salt thermal modification, the capability of NH4＋-N removal increased 37.12%. The optimal conditions of salt thermal modification were modified in 2.0% solution of NaCl concentration for 2 h, then 0.5 h of calcination at 500 ℃. According to the results, adsorption isotherms were depicted for nitrogen removal, in which nitrogen absorption can match well with Freundlich isotherm model. Compared with the power function, elovich absorption kinetic equation can illuminated the absorption process clearly. The morphology of the material was characterized by SEM. From the SEM images it can be seen the pore structure was expanded to some extent and the diameter and shape of pores were changed obviously. Meanwhile, the components of the material varied by the analysis of EDS.
出处
《水处理技术》
CAS
CSCD
北大核心
2010年第8期25-28,32,共5页
Technology of Water Treatment
基金
国家"十一五"科技支撑计划重大资助项目(2006BAC19B01)
关键词
吸附
盐热改性
氨氮
沸石
adsorption
salt ＆ thermal modification
ammoniacal nitrogen
zeolite
