Effect of slug flow on dextran ultrafiltration in ceramic membrane process

ZHANG Feng; JING Wenheng; XING Weihong

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Effect of slug flow on dextran ultrafiltration in ceramic membrane process

更新时间：2025-12-10

- Effect of slug flow on dextran ultrafiltration in ceramic membrane process
- CIESC Journal Issue 11, Pages: 2792-2797(2009)
- 作者机构：
  
  南京工业大学膜科学技术研究所，材料化学工程国家重点实验室
- 作者简介：
- 基金信息：
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- Online First：05 November 2009，
  
  Published：05 November 2009
- 稿件说明：
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ZHANG Feng, JING Wenheng, XING Weihong. Effect of slug flow on dextran ultrafiltration in ceramic membrane process[J]. CIESC Journal, 2009, (11): 2792-2797.
DOI：

ZHANG Feng, JING Wenheng, XING Weihong. Effect of slug flow on dextran ultrafiltration in ceramic membrane process[J]. CIESC Journal, 2009, (11): 2792-2797. DOI：

摘要

为降低膜污染和浓差极化需维持较高膜面流速，能耗较高。将气升式外循环引入膜过程，可有效降低浓差极化和能耗。实验考察了曝气量对渗透通量的影响，当曝气量为400 L·h-1时，与相同液速条件下单相流错流过滤相比较，膜通量提升87%；进一步增大曝气量，膜通量增加趋势变缓。对气升式膜过滤过程的水力学特性进行了研究，在弹状流条件下，气液两相流可有效提高膜面剪切力，增强膜面传质。在较低流速下，曝气可有效降低膜污染阻力，提高膜通量。结合气液两相流理论和膜过滤阻力模型，分析了弹状流提升膜通量的机理。

Abstract

The ceramic membrane process has been encountered with a problem of high energy consuming owing to that high crossflow velocities are necessary for the concentration polarization and membrane fouling control. On the other hand

the external loop airlift reactor is widely used in the field of chemical engineering. Thus

the application of air sparging in dextran ultrafiltration with ceramic membrane process is studied at different gas flow rates (QG). 87% increase in permeation flux was achieved while filtering 2 g·L-1 dextran (2×106) solution with the airlift crossflow operation of QG=400 L·h-1. Hydrodynamics of the gas-liquid two-phase flow was characterized and the flux enhancement mechanism in the case of slug flow in tubular ceramic membrane was discussed.

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