Supported gas membrane-based ammonia removal and recovery for a pH-dependent sink: Effect of water vapor transport
Supported gas membrane-based ammonia removal and recovery for a pH-dependent sink: Effect of water vapor transport
复制标题
支持基于气膜的氨去除和 pH 依赖性水槽回收：水蒸气传输的影响
DOI：
10.1016/j.memsci.2020.118308
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发表时间：
2020
影响因子：
9.5
通讯作者：
Cheng, Wu-Cheng
中科院分区：
文献类型：
--
作者：
Aligwe, Philip;Sirkar, Kamalesh K;Canlas, Christian J;Cheng, Wu-Cheng
有时NH3通过疏水多孔中空纤维膜（HFM）经由脱气气体膜（SGM）工艺从工艺/流出物流中汽提，并在浓H2SO 4溶液中以（NH 4）2SO 4形式回收。为了回收相对纯净的（NH 4）2SO 4，可以使用更稀的H2SO 4反萃溶液来避免过量的H2SO 4。对于pH值较高的H2SO 4反萃溶液，对低pH值反萃H2SO 4溶液的反萃侧传质阻力的抑制是不可取的。小型中空纤维膜组件（HFETH）与较高pH值的H2SO 4剥离溶液一起使用。采用反应增强传质模型成功模拟了高pH H2SO 4溶液中的传质过程。采用大规模的错流HFETRONES，从一个大的坦克含氨工艺废水的时间依赖性氨去除模拟分批再循环操作。较大规模的模块采用壳程进料液体与管程中的整体逆流流动模式和酸流交叉流动。在间歇循环法中，不考虑水蒸气迁移的氨迁移模型会产生很大的误差。在此考虑了大罐中低pH和高pH H2SO 4汽提溶液中含氨进料的水蒸气传输。模型结果描述了基于文献的实验观察到的工业处理系统中的传质行为。模型计算还作出了连续氨回收工业废水中的串联连接的HFETs没有任何批量再循环的数量。
Sometimes NH3is stripped from process/effluent streams through hydrophobic porous hollow-fiber-membranes (HFMs) via a supported-gas-membrane (SGM) process and recovered in concentrated H2SO4solution as (NH4)2SO4. To recover relatively purified (NH4)2SO4, one can avoid excess H2SO4with a more dilute H2SO4strip solution. Neglect of strip-side mass-transfer resistance for low-pH strip H2SO4solutions is not desirable with higher-pH H2SO4strip solutions. Small hollow-fiber membrane modules (HFMMs) were used with a higher-pH H2SO4strip solution. Mass transfer was successfully modeled using reaction-enhanced mass transport in higher-pH H2SO4solution. Employing larger-scale crossflow HFMMs, time-dependent ammonia removal from a large tank having ammonia-containing process effluent was modeled for batch recirculation operation. The larger-scale modules employ shell-side feed liquid in crossflow with an overall countercurrent flow pattern and acid flow in the tube side. Modeling ammonia transport without water vapor transfer can cause substantial errors in batch recirculation method. Water vapor transport was considered here for low-pH and high-pH H2SO4strip solutions for ammonia-containing feed in a large tank. Model results describe literature-based experimentally observed mass transfer behavior in industrial-treatment systems well. Model calculations were also made for continuous ammonia recovery from industrial effluents by a number of series-connected HFMMs without any batch recirculation.
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DOI：
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发表时间：
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