沸石的优化改性及其对水中氨氮去除性能  

Optimized Modification of Zeolite for Ammonia-Nitrogen Removal from Aqueous Solution

作　　者：何钰莹 杨舸 张丹一 王国桥 张伟才 吴宜霖 王美城 陈尧[1] HE Yuying;YANG Ge;ZHANG Danyi;WANG Guoqiao;ZHANG Weicai;WU Yilin;WANG Meicheng;CHEN Yao(College of Architecture and Environment, Sichuan University, Chengdu 610065, China)

机构地区：[1]四川大学建筑与环境学院

出　　处：《净水技术》2019年第4期59-64,共6页Water Purification Technology

基　　金：四川大学大学生创新创业计划—省级重点(201710611037)

摘　　要：为提高沸石对氨氮废水的处理能力,对沸石进行了优化改性,探讨了改性剂种类、改性剂浓度和不同改性操作方法对沸石去除氨氮的影响。结果表明,经氢氧化钠和氯化钠溶液改性的沸石,其氨氮去除性能有明显提升,而磷酸处理后的沸石对氨氮的去除无明显作用,且加热搅拌对沸石改性的效果优于混合静置的方法。采用1.5mol/L的氢氧化钠溶液浸渍沸石、搅拌加热1h后,可获得最佳的改性沸石,强化的离子交换作用使得沸石对水中的氨氮有良好的去除效果。室温下,在初始氨氮浓度为50mg/L的溶液中投加4g/L的改性沸石,反应2h后,氨氮的去除率可达90%,且反应后溶液的pH变为弱碱性,更利于氨氮的析出。耗竭的沸石用0.9mol/L的氯化钠溶液进行解吸并再生,经3次解吸和再生后,沸石的解吸率为86.3%,吸附容量约为原沸石的70%。In order to improve the treatment ability of zeolite to ammonia-nitrogen wastewater, the modification of zeolite was optimized, and the effects of modifier type, modifier concentration and different modification methods on the removal of ammonia nitrogen by zeolite were discussed. The results showed that ammonia nitrogen removal performance on zeolite was obviously improved after modification with sodium hydroxide and sodium chloride solution, but the removal of ammonia nitrogen was insignificant after phosphoric acid treatment. Moreover, the effect of heating agitation on zeolite modification was better than that with mixed static method. The modified zeolite with stable properties could be obtained through impregnating with 1.5 mol/L sodium hydroxide solution and stirring for 1 hour. Due to enhanced ion characteristics,modified zeolite had a better removal efficiency of ammonia nitrogen in water. At room temperature, modified zeolite was added to 50 mg/L ammonia-nitrogen solution in a dose of 4 mg/L. After 2 hours reaction, removal rate of ammonia-nitrogen could reach 90%, and pH value of the solution became weak alkaline, which was more favorable to ammonia-nitrogen escape. The exhausted zeolite was desorbed and regenerated by 0.9 mol/L NaCl solution. After three times regeneration and recycling, zeolite desorption rate was still up to 86.3% and its adsorption capacity kept 70% of the original zeolite.

关 键 词：氨氮 沸石 优化改性 正交试验 再生 

分 类 号：TU992[建筑科学—市政工程]