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Study on Mass Transfer in PTFE hollow fiber Supported-Gas-Membrane Process for Ammonia Removal at High Temperature

Authors： XU Yuzhuang, QIN Yingjie, JIA Yumeng, LIU Yi, CAI Tenghao, YU Wenkai

Units： (1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350; 2.Purification Equipment Research Institute of CSIC, Handan,Hebei 056027 PureSea Spring Membrane Technology, Ltd., Tianjin 300350

KeyWords： supported-gas-membrane; PTFE hollow fiber; high temperature; ammonia-containing wastewater; mass transfer

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(5):113-121

Abstract：

The supported-gas-membrane process was investigated for the removal/enrichment of ammonia from aqueous solution, by using membrane contactor made of microporous hydrophobic PTFE hollow fibers and using dilute sulfuric acid as the stripping solution, in order to obtain higher mass transfer coefficient and ammonia removal rate at high temperature. The influence of the operating conditions such as feed concentration, feed flow rate, feed temperature and pH value of the stripping solution on the membrane performance was tested, and the long-term operation stability test at the high-temperature condition was also performed. The experimental results indicated that the overall mass transfer coefficient K and the ammonia removal rate η increased greatly with the increase of operation temperature. For instance, K increased from 9.17x10-6m/s at 25℃to 2.86x10-5m/s at 75℃; However, the feed concentration and flow rate had almost no influence on K and η. The mathematical model based on mass transfer mechanism can describe well the influence of feed temperature, feed concentration, feed flow rate and pH value of the stripping solution on K. The results of batch experiments showed that the enrichment of ammonia at high temperature was slightly lower than that at ambient temperature, but still more than 18 times.Within 3 months of continuous test, the membrane module showed good performance stability, and K and η ware almost unchanged. This study provides experimental data and lays a theoretical foundation for the industrial application of supported-gas-membrane for ammonia removal at high temperature.

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AuthorIntro：

许玉壮（1995-），男，河南郑州，硕士研究生，研究方向为新型膜分离技术，电子邮件:xyz844890856@163.com

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