氯化钠对改性沸石微波脱除氨氮效果的影响

doi:10.3969/j.issn.0438-1157.2013.08.041

化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2989-2995.DOI: 10.3969/j.issn.0438-1157.2013.08.041

氯化钠对改性沸石微波脱除氨氮效果的影响

林海, 杨苏, 霍汉鑫, 董颖博, 马麒钧

北京科技大学土木与环境工程学院, 北京 100083

收稿日期:2012-12-05 修回日期:2013-03-26 出版日期:2013-08-05 发布日期:2013-08-05
通讯作者: 林海(1966- ),男,博士,教授。
作者简介:林海(1966- ),男,博士,教授。
基金资助:
国家自然科学基金项目(51174017)。

Effect of sodium chloride on microwave-assisted removal of ammonia nitrogen by natural zeolite

LIN Hai, YANG Su, HUO Hanxin, DONG Yingbo, MA Qijun

School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2012-12-05 Revised:2013-03-26 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Natural Science Foundation of China(51174017).

摘要/Abstract

摘要： 通过添加助剂NaCl在微波下对天然沸石进行加热制备环境材料,研究了微波后沸石对再生水中氨氮的去除效果。研究发现,助剂预处理可以大大提高微波沸石的脱氮效果。在沸石与NaCl溶液固液比1:50,NaCl溶液浓度4%,343 W的微波功率加热4 min的条件下,微波沸石环境材料对氨氮的去除效果最好,最佳去除率可达99.70%;单独进行343 W、4 min的微波加热沸石对氨氮的去除率为76.46%;相对于天然沸石,上述两种微波沸石对氨氮去除率分别提高了39%、15.76%。通过SEM、EDS、XRD等表征手段对微波前后的沸石分析发现,在微波加热过程中助剂氯化钠的加入使沸石颗粒表面更加松散,出现了更多的孔道,同时天然沸石Ca、Mg、P、S峰消失,主衍射峰强度有所减弱,出现了部分非晶化特征。

关键词: 沸石, 氨氮, 微波, 助剂, 再生水处理

Abstract: The effect of additive NaCl on microwave-assisted removal of ammonia nitrogen by natural zeolite,including factors influencing adsorption and ion-exchange,was investigated.The results show that microwave-assisted can greatly improve the efficiency of zeolite denitrification.The best conditions are:microwave power 343 W,time 4 min,concentration of NaCl 4%,size of zeolite particles 0.1-0.15 mm,and the best removal efficiency is up to 99.70%.As a comparison,no NaCl addition but microwave auxiliary,the removal rate of ammonia nitrogen by zeolite is 76.46%. If only zeolite was employed the removal rate is 60.70%.So the increase of efficiency is significant,39%,15.76% respectively. The results of zeolite surface morphology and element measurements by SEM,EDS and XRD indicated that sodium chloride could improve microwave heating and ion exchange of zeolite.Its ion exchange capacity for ammonia at microwave condition increases greatly by NaCl.

Key words: zeolite, ammonia nitrogen, microwave, additives, recycled water treatment

中图分类号:

X703.5

林海, 杨苏, 霍汉鑫, 董颖博, 马麒钧. 氯化钠对改性沸石微波脱除氨氮效果的影响[J]. 化工学报, 2013, 64(8): 2989-2995.

LIN Hai, YANG Su, HUO Hanxin, DONG Yingbo, MA Qijun. Effect of sodium chloride on microwave-assisted removal of ammonia nitrogen by natural zeolite[J]. CIESC Journal, 2013, 64(8): 2989-2995.

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氯化钠对改性沸石微波脱除氨氮效果的影响

Effect of sodium chloride on microwave-assisted removal of ammonia nitrogen by natural zeolite

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