中空纤维支撑液膜去除水中氨氮的传质行为研究  

Hollow fiber supported liquid membrane mass transfer process for removal of ammonia in water

作　　者：胡闻龙 王磊[1] 张荣[1] 王旭东[1] 吕永涛[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《膜科学与技术》2015年第1期14-19,共6页Membrane Science and Technology

基　　金：国家自然科学基金项目(51178378);陕西省科技创新项目(2012KTCL03-06;2013KTCL03-16)

摘　　要：以聚丙烯（PP）中空纤维膜为支撑体,二（2-乙基己基）磷酸（简称D2EHPA）为载体,煤油为膜溶剂,探讨D2EHPA-煤油-H2SO4中空纤维支撑液膜（SLM）体系对水中氨氮的传质行为.以去除率为指标,考察了料液初始氨氮浓度及pH值、载体浓度、反萃剂浓度对传质效果的影响;并通过对比实验分析了导致传质速率降低的主要原因.结果表明：在反萃剂H2SO4浓度为2mol/L,料液相pH值在8~13范围内,提高料液pH值、增大膜相中载体浓度,均能提高氨氮的去除率.D2EHPA-煤油-H2SO4体系对氨氮的传质能力随氨氮浓度降低而下降.料液中氨氮浓度下降和pH值降低是导致氨氮传质速率降低的主要原因,调节料液pH值可调控和提高氨氮的去除与传质效果.The mass transfer behavior of ammonia-nitrogen from aqueous media through hollow fiber supported liquid membrane process consisting of di（2-ethylhexly） phosphoric acid（D2EHPA） in kerosene, supported on the polypropylene hollow fiber membrane, was studied. The influence of the initial pH value and ammonia-nitrogen concentration in feed phase, the carrier concentration and the acid concentration in stripping phase on ammonia removal is also characterized by the removal rate. The primary reason of the ammonia removal rate which is constantly declining is discussed by the contrast experiment. The results show that when the acid concentration is 2 mol/L and the pH value is within the range of 8 to 13, the removal rate can be improved by increasing ammonia concentration, pH value of feed and the carrier concentration. The capacity of D2EHPA-kerosene-H2SO4 system for ammonia mass transfer decreases with decreasing ammonia concentration. The decline of Ammonia removal rate is mainly caused by lowering pH and reducing ammonia concentration in feed solution. Adjusting the pH value can improve the control and effects of mass transfer.

关 键 词：氨氮 中空纤维支撑液膜 传质 D2EHPA 

分 类 号：TQ028.8[化学工程]