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

Authors： Hu Wenlong，Wang Lei，Wang Xudong，Lv Yongtao

Units： Xi’an University of Architecture and Technology, Xi’an 710055, China

KeyWords： ammonia-nitrogen; hollow fiber supported liquid membrane; mass transfer;D2EHPA

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):14-19

Abstract：

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.

Funds：

国家自然科学基金项目（No.51178378）；陕西省科技创新项目（No.2012KTCL03-06;No.2013KTCL03-16）

AuthorIntro：

胡闻龙(1988—)，男，辽宁本溪人，硕士研究生，主要从事液膜分离技术的研究，wo2813531@sina.com，18392180577；王磊（1971—），男，教授，博士生导师，主要从事水污染控制及废水再生等理论与技术的研究，通讯联系人，wl0178@126.com，西安建筑科技大学环境与市政工程学院，邮编710055

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