直接接触式膜蒸馏过程的膜曝气强化

发布时间：2018-05-05 14:42

本文选题：直接接触式膜蒸馏 + 膜曝气　；参考：《化工学报》2017年05期

【摘要】：针对直接接触式膜蒸馏(direct contact membrane distillation,DCMD)过程存在的膜通量小及膜污染问题,设计了一种新型结构的膜蒸馏组件。以蔗糖溶液为处理液,考察了膜组件装填密度Φ、膜曝气量q、蔗糖浓度c与温度T0对DCMD过程的影响。结果表明:随着Φ、q的增加,DCMD过程的膜通量先增大,后逐渐降低,Φ、q均存在最优值;随着c的增加,膜通量逐渐降低;随着T0的增加,膜通量增大;对c为30%(mass)的蔗糖溶液进行DCMD法处理330 min时,膜曝气可使DCMD的初始膜通量Jinitial提升24.7%、膜通量衰减率ΔJ降低55.0%,维持高膜通量的连续运行时间t0延长4倍。主要原因是膜曝气强化了DCMD过程的传热传质,进而强化过程的分离性能;有效控制了DCMD过程的浓差极化,进而延缓过程的膜污染进程。研究结果有利于推进DCMD的工程化应用。
[Abstract]:A novel membrane distillation module was designed to solve the problems of low membrane flux and membrane fouling in direct contact membrane distillation (DMD) process. The effects of filling density 桅, membrane aeration rate Q, sucrose concentration c and temperature T 0 on DCMD process were investigated with sucrose solution as the treatment solution. The results showed that with the increase of 桅 Q, the flux of DCMD increased first, then decreased, and 桅 Q had an optimum value, with the increase of c, the flux of DCMD decreased, and the flux of membrane increased with the increase of T0. When the sucrose solution (c = 30 and mass) was treated with DCMD for 330 min, the initial membrane flux (Jinitial) of DCMD was increased by 24.7%, the flux attenuation rate (螖 J) decreased by 55.0%, and the continuous running time t _ 0 of maintaining high membrane flux was increased by 4 times. The main reason is that the membrane aeration enhances the heat and mass transfer of the DCMD process and further enhances the separation performance of the DCMD process, and effectively controls the concentration polarization of the DCMD process and delays the process of membrane fouling. The results are beneficial to the engineering application of DCMD.
【作者单位】：省部共建分离膜与膜过程国家重点实验室;天津工业大学环境与化学工程学院;天津工业大学生物化工研究所;
【基金】：天津市科技支撑计划重点项目(15ZCZDSF00070) 天津市科技计划项目(15PTSYJC00240)~~
【分类号】：TQ028.8

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