基于硝酸钠联合焙烧改性天然沸石的水体氨氮动态吸附特性研究  

Study on ammonia nitrogen dynamic adsorption characteristics of natural zeolites modified by sodium nitrate combined with calcination

作　　者：刘文香 李祎 沈毅凡 黄雪霓 付海陆[1] LIU Wenxiang;LI Yi;SHEN Yifan;HUANG Xueni;FU Hailu(College of Energy Environment and Safety Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学能源环境与安全工程学院,浙江杭州310018

出　　处：《中国计量大学学报》2024年第1期177-184,共8页Journal of China University of Metrology

基　　金：国家重点研发计划项目(No.2019YFC0408400).

摘　　要：目的:通过硝酸钠浸渍联合焙烧改性天然沸石(NZ),开发出一种氨氮高性能吸附剂,研究改性NZ对水体中氨氮的动态吸附特性及穿透曲线,并与NZ的氨氮动态吸附能力做出对比。方法:考察在不同初始氨氮质量浓度、进水流量和柱深条件下氨氮的去除情况和穿透曲线,运用Thomas模型、Yoon-Nelson模型和BDST模型对吸附过程拟合。结果:当初始氨氮质量浓度为5 mg·L^(-1)、进水流量为20 mL·min^(-1)、柱深为8 cm时,对氨氮的吸附容量达6.81 mg·g^(-1),远大于NZ吸附容量2.18 mg·g^(-1)。结论:硝酸钠联合焙烧改性沸石可提高对氨氮的吸附能力,动态流实验结果为改性沸石实际应用提供了有力指导。Aims:A kind of adsorbent with high ammonia nitrogen adsorption performance was developed by using sodium nitrate impregnation combined with roasting to modify natural zeolites(NZ).The dynamic adsorption characteristics and penetration curve of modified NZ for ammonia nitrogen in water were studied,and the dynamic adsorption capacity of NZ was compared with that of NZ.Methods:The removal efficiency and penetration curve of ammonia nitrogen under different initial mass concentration,influence flow and column depth conditions were investigated;and the Thomas model,Yoon-Nelson model and BDST model were applied to simulate the adsorption process.Results:When the initial ammonia nitrogen mass concentration was 5 mg·L^(-1),the column depth was 8 cm.The influent flow was 20 mL·min^(-1);and the adsorption capacity of ammonia nitrogen reached 6.81 mg·g^(-1),which was much higher than the 2.18 mg·g^(-1) of NZ.Conclusions:Sodium nitrate combined roasting modified zeolites can improve the adsorption capacity of ammonia nitrogen;and the results of dynamic flow experiment provide favorable guidance for the practical application of modified zeolites.

关 键 词：动态吸附 改性沸石 穿透曲线 模型拟合 

分 类 号：X703[环境科学与工程—环境工程]