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.
机构:
Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
Chen, Tsung-Ching
;
Ho, Chii-Dong
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Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
Ho, Chii-Dong
;
Yeh, Ho-Ming
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Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
机构:
UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA
DACOSTA, AR
;
FANE, AG
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UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA
FANE, AG
;
WILEY, DE
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UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA
机构:
Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
Chen, Tsung-Ching
;
Ho, Chii-Dong
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Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
Ho, Chii-Dong
;
Yeh, Ho-Ming
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机构:
Tamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, TaiwanTamkang Univ, Energy & Optoelect Mat Res Ctr, Dept Chem & Mat Engn, Taipei 251, Taiwan
机构:
UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA
DACOSTA, AR
;
FANE, AG
论文数: 0引用数: 0
h-index: 0
机构:
UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA
FANE, AG
;
WILEY, DE
论文数: 0引用数: 0
h-index: 0
机构:
UNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIAUNIV NEW S WALES,SCH CHEM ENGN & IND CHEM,CTR MEMBRANE SCI & TECHNOL,KENSINGTON,NSW 2033,AUSTRALIA