Hollow fiber gas membrane-based removal and recovery of ammonia from water in three different scales and types of modules
Hollow fiber gas membrane-based removal and recovery of ammonia from water in three different scales and types of modules
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DOI：
10.1016/j.seppur.2019.04.074
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发表时间：
2019-10-01
影响因子：
8.6
通讯作者：
Canlas, Christian J.
中科院分区：
文献类型：
--
作者：
Aligwe, Philip A.;Sirkar, Kamalesh K.;Canlas, Christian J.
存在于许多工业过程流和流出物流中的氨开始通过具有充气孔的微孔疏水中空纤维膜接触器装置来回收;该过程通常被表征为支撑气体膜（SGM）过程。硫酸铵通常在膜的另一侧的硫酸流中获得。为此类装置中氨的去除程度建立定量基础是有用的。与此类装置中水流的脱氧不同，膜阻力对于氨输送非常重要。在这种装置中的氨传输建模受到商业上使用的装置的壳侧中的进料液体流动的复杂性和膜阻力的信息缺乏的阻碍，其中膜弯曲度引入了相当大的不确定性。这里采用的方法涉及研究氨传输与进料溶液流过中空纤维孔，其中流体力学比壳侧流动更简单。基于模型的总传质系数（k（o））的预测与实验观察值的比较允许估计膜传质系数（k（m））。人们可以使用这样的估计k（m），以模拟所观察到的氨传输在小的错流装置和开发的壳侧传质相关性的依赖性的经验指导。在这些信息和脱氧SGM文献的指导下，开发了用于通过SGM回收氨的大型模块的模型。模型预测的大型模块的性能可能是有用的各种工艺考虑，包括温度和进料流速的变化对氨去除的影响。
Ammonia present in many industrial process streams and effluent streams is beginning to be recovered by means of microporous hydrophobic hollow fiber-based membrane contactor devices with gas-filled pores; the process is often characterized as supported gas membrane (SGM) process. Ammonium sulfate is usually obtained in a sulfuric acid stream on the other side of the membrane. It is useful to develop a quantitative basis for the extent of ammonia removal in such devices. Unlike deoxygenation of aqueous streams in such devices, membrane resistance is quite important for ammonia transport. Ammonia transport modeling in such devices is hampered by the complexity of feed liquid flow in the shell side of commercially used devices and lack of information on membrane resistance where membrane tortuosity introduces considerable uncertainty. The approach adopted here involves studying ammonia transport with the feed solution flowing through the hollow fiber bore where the fluid mechanics is simpler than shell-side flows. Comparison of model-based predictions of overall mass transfer coefficient (k(o)) with experimentally observed values allows estimation of the membrane mass transfer coefficient (k(m)). One can use such estimates of k(m) to model the observed ammonia transport in small crossflow devices and develop an empirical guidance of the dependences of the shell side mass transfer correlations. Guided by such information and deoxygenation SGM literature, a model was developed for large modules used for ammonia recovery via SGM. Model predictions of performances of the large modules are likely to be useful for various process considerations including the effect of temperature and feed flow rate variations on ammonia removal.