Intensify direct contact membrane distillation process by membrane aeration

被引：0

作者：

Dong C. ^{[1
,2
,3
]}

Gao Q. ^{[1
,3
]}

Lü X. ^{[1
,3
]}

Jia W. ^{[1
,2
,3
]}

机构：

[1] State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin

[2] School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin

[3] Institute of Biological and Chemical Engineering, Tianjin Polytechnic University, Tianjin

来源：

Gao, Qijun (gqj2005@aliyun.com) | 1913年 / Materials China卷 / 68期

关键词：

Direct contact membrane distillation; Gas-liquid flow; Heat transfer; Mass transfer; Membrane aeration; Membrane fouling; Process intensification;

D O I：

10.11949/j.issn.0438-1157.20161542

中图分类号：

学科分类号：

摘要：

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. © All Right Reserved.

引用

页码：1913 / 1920

页数：7

共 31 条

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