Intensify direct contact membrane distillation process by membrane aeration

DONG Chang; GAO Qijun; LÜ Xiaolong; JIA Wei

doi:10.11949/j.issn.0438-1157.20161542

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Intensify direct contact membrane distillation process by membrane aeration

更新时间：2025-12-10

- Intensify direct contact membrane distillation process by membrane aeration
- CIESC Journal Issue 5, Pages: 1913-1920(2017)
- 作者机构：
  
  1. 省部共建分离膜与膜过程国家重点实验室,天津,300387
  2. 天津工业大学环境与化学工程学院,天津,300387
  3. 天津工业大学生物化工研究所,天津,300387
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161542
  CLC： Q028.8
- Online First：05 May 2017，
  
  Published：05 May 2017
- 稿件说明：
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DONG Chang, GAO Qijun, LÜ Xiaolong, et al. Intensify direct contact membrane distillation process by membrane aeration[J]. CIESC Journal, 2017, (5): 1913-1920.
DOI：

DONG Chang, GAO Qijun, LÜ Xiaolong, et al. Intensify direct contact membrane distillation process by membrane aeration[J]. CIESC Journal, 2017, (5): 1913-1920. DOI： 10.11949/j.issn.0438-1157.20161542.

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

To solve the problem that direct contact membrane distillation (DCMD) process presents a low distillate flux and membrane fouling

a new form of membrane distillation module has been designed in the paper. Sucrose solution was used as feed solution in the experiments. The effect of various parameters on the performance of DCMD process was investigated. The parameters included the packing density of the module Φ

the membrane aeration amount q

the concentration c and temperature T0 of feed solution. The results indicated that with the increase of the packing density of module Φ and membrane aeration amount q

the DCMD flux increased first

then gradually decreased. Φ and q had optimal value

respectively. The DCMD flux decreased gradually with the increase of c

but increased with the increase of T0. For a constant concentration (30%) feed

when the DCMD process ran 330 min

compared to the process without membrane aeration

membrane aeration made the initial flux Jinitial increased 24.7%

the decay rate of flux ΔJ decreased more than 55.0%

the continuous running time t0 for maintaining high flux lengthened 4 times. The hot feed of DCMD process was aerated by PVDF membrane

on the one hand

to promote the heat and mass transfer of process

thus to intensify the separation performance of process

on the other hand

to control effectively the concentration polarization of process

thus to delay the membrane fouling process. The study was helpful to promote the engineering application of DCMD technique.

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