3.南京信息工程大学环境科学与工程学院,南京210044;
4.复旦大学环境科学与工程系,上海200433
摘要采用氯化钠溶液对浙江某地天然沸石改性,以低浓度氨氮废水为处理对象,比较了天然沸石和改性沸石的吸
附等温线、吸附动力学和动态吸附,并进行了改性沸石的动态脱附研究。结果表明,沸石的平衡吸附量随着平衡浓度的增大而增大; F reund lich方程比L angm uir方程更好地描述沸石吸附低浓度氨氮废水的行为,改性沸石比天然沸石具有更大的吸附氨氮能力。假二级方程很好地拟合沸石吸附动力学实验数据。装填105g的改性沸石吸附柱有效处理20mg /L氨氮的废水量为40L ,是装填相同质量天然沸石吸附柱的2 67倍,出水氨氮浓度小于5mg /L。用含氯化钠和氢氧化钠的溶液脱附改性沸石吸附柱吸附的氨氮,脱附率为95 2%。
第5卷第2期环境工程学报
V o l . 5, N o. 2
2011年2月
Feb. 2011
改性沸石吸附低浓度氨氮废水及其脱附的研究
唐登勇
1, 2, 3
郑正4
郭照冰
1, 2, 3林志荣Fra bibliotek1, 2, 3
董超3
王晓兰
3
(1江苏省大气环境监测与污染控制高技术研究重点实验室,南京210044;
2.南京信息工程大学循环经济与清洁生产研究中心,南京210044;
Prov i n ce and the properties of lo w concentrati o n a mm on ia nitrogen (NH 3 N adsorption fro m w aste w ater f o r the zeo lites w ere stud ied . The adsor pti o n isother m s , adsor pti o n k i n etics and dyna m ic adsorption adsor pti o n w ere co m pared bet w een the natura l zeo lite and t h e m odified zeo lite , and dyna m ic desorption ofNH 3 N fro m the m od i fied zeo lite w as a lso conducted . The results sho w ed that t h e equ ilibri u m adsorption quantity increased w ith i n creasi n g equ ilibri u m concentration and Freundlich equation w as better to pred ict the experi m ental data than Lang m uir equati o n . The m odified zeo lite had h i g her adsorption capacity than the na t u ra l zeo lite . The adsorption kinet ic data w ere fitted w e ll by the pseudo second o r der k i n etic m ode. l Forty liter w aste w ater conta i n i n g 20m g /LNH 3 N w as effecti v e l y treated by t h e adsorption co lu m n w it h 105g m odified zeo lite , wh ic h w as 2 67ti m es that of t h e adsor pti o n co lu m n w ith equa lm ass natural zeo lite , and the concentrati o n ofNH 3 N w as less than 5m g /Lin t h e effluen. t The desor pti o nefficiency of NH 3 N fro m the modified zeo lite w as to 95 2%usi n g the m ixture of N a C l and N a OH so l u tion.
2. Research C enter of Cycli c Econo m y and C lean er Production , Nan ji ng Un ivers it y of In f or m ati on S ci ence&
Technol ogy , Nan ji ng 210044, Ch i n a ;
Tang Dengyong
1, 2, 3
Zheng Zheng 4 Guo Zhaobing
1, 2, 3
L i n Zh ir ong
1, 2, 3
Dong Chao 3 W ang X i a olan
3
(1 J i angs u K ey L aboratory of At mosph eric Env i ron m en tM on i tori ng and Po ll uti on Con tro, l N an ji ng 210044, C h i na ;
关键词改性沸石氨氮吸附脱附
中图分类号X703文献标识码A文章编号1673 9108(2011 02 0293 04
Study on a mmoni a nitrogen adsorpti on fro m l ow concentration waste w ater
by modified zeolite and its desorption
3. S chool of Env i ron m en tal Science and Engi n eeri ng , Nan ji ng U n i vers it y of In f or m ation S ci en ce&T echnology , Nan ji ng 210044, Ch i na ;
4. Depart m ent ofE nvironm ental Science&Eng i neeri ng , Fud an U nivers it y , Shanghai 200433, C hina
Abst ract Sod i u m chloride aqueous so l u tion w as used to m odify the natural zeo lite obtained fro m Zhejiang