Factors contributing to flux improvement in vacuum-enhanced direct contact membrane distillation

被引:38
作者
Rao, Guiying [1 ]
Hiibel, Sage R. [1 ]
Achilli, Andrea [2 ]
Childress, Amy E. [3 ]
机构
[1] Univ Nevada, Dept Civil & Environm Engn, Reno, NV 89557 USA
[2] Humboldt State Univ, Environm Resources Engn Dept, Arcata, CA 95521 USA
[3] Univ So Calif, Sonny Astani Dept Civil & Environm Engn, Los Angeles, CA 90089 USA
关键词
Direct-contact membrane distillation; Flux improvement; Membrane compaction; Membrane pore pressure; HOLLOW-FIBER MEMBRANES; MASS-TRANSFER; WASTE-WATER; MICROPOROUS MEMBRANES; TRANSPORT; HEAT; DESALINATION; OSMOSIS; GAS; PERFORMANCE;
D O I
10.1016/j.desal.2015.04.002
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Low water flux in membrane distillation (MD) is a concern for full-scale application. In the past decades, attempts have been made to improve water flux in MD and vacuum-enhanced direct-contact MD (VEDCMD) has been proven to be an effective configuration to achieve this. However, only qualitative assessments of the factors that might improve water flux have been reported in the literature. In this study, a mechanistic investigation of the factors contributing to higher water flux in VEDCMD was performed. Direct-contact MD (DCMD) and pressure-enhanced DCMD (PEDCMD) configurations were also investigated for comparison. Less membrane compaction was identified as one dominant factor contributing to improved water flux in VEDCMD as very little compaction occurred in VEDCMD compared to that which occurred in DCMD and PEDCMD. Lower air pressure inside the membrane pores was found to be the other dominant factor contributing to improved water flux in VEDCMD; the air pressure was calculated as the average of the feed and distillate pressures in VEDCMD and as the distillate pressure in DCMD and PEDCMD. Pressure difference, as is present in both PEDCMD and VEDCMD, was found to have a minimal effect on water flux. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:197 / 205
页数:9
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