不同改性沸石强化去除雨水径流氮磷机制  

Mechanism of Enhanced Nitrogen and Phosphorus Removal from Rainwater Runoff by Different Modified Zeolites

作　　者：陈忱 骆辉[1] 曹馨月 荆肇乾[1] CHEN Chen;LUO Hui;CAO Xinyue;JING Zhaoqian(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《净水技术》2020年第6期141-149,共9页Water Purification Technology

基　　金：国家科技支撑计划项目(2015BAL02B04);住房和城乡建设部科学技术项目(2015-K7-012);南京林业大学大学生科技创新资助项目(2019NFUSPITP0490)。

摘　　要：为了更有效地去除初期雨水径流中氮磷等营养类污染物,文中采用钠铁、钠镧和钠锆作为改性材料制备3种不同类型的改性沸石,即钠锆改性沸石(Z/Na/Zr)、钠镧改性沸石(Z/Na/La)和钠铁改性沸石(Z/Na/Fe),并通过吸附等温线、动力学和热力学对比考察不同改性沸石对雨水径流中氨氮和磷酸盐吸附规律的影响。结果表明,3种改性沸石都可以很有效地吸附雨水中的氨氮和磷酸盐,且Z/Na/Zr对水中磷酸盐的吸附性能明显优于Z/Na/La和Z/Na/Fe。3种改性沸石对磷酸盐和氨氮的吸附过程符合准二级动力学模型,吸附过程是吸热反应,温度的升高有利于进行吸附反应。从吸附动力学和吸附热力学角度来看,钠锆联合改性沸石可作为控制雨水径流氮磷污染的良好材料。In order to effectively remove nitrogen and phosphorus pollutants in initial runoff,three kinds of modified zeolites were prepared by using Na/Zr modified Zeolite(Z/Na/Zr),Na/La Modified Zeolite(Z/Na/La)and Na/Fe modified Zeolite(Z/Na/Fe).The effects of different modified zeolites on the adsorption of ammonia nitrogen and phosphate in rainwater runoff were investigated by means of sorption isotherm,kinetics and thermodynamics.Results showed that the three modified zeolites could effectively adsorb ammonia nitrogen and phosphate in rainwater,and the adsorption performance of Z/Na/Zr to phosphate in water was obviously better than that of Z/Na/La and Z/Na/Fe.The adsorption process of phosphate and ammonia nitrogen by three modified zeolites accorded with the quasi-second-order kinetic model.The adsorption process was an endothermic reaction.From the point of view of adsorption kinetics and thermodynamics,Na/Zr modified zeolite could be used as a good material for controlling nitrogen and phosphorus pollution in rainwater runoff.

关 键 词：沸石 海绵城市 铁改性 镧改性 锆改性 

分 类 号：TU992[建筑科学—市政工程]