Retardation of wetting for membrane distillation by adjusting major components of seawater

Title
Retardation of wetting for membrane distillation by adjusting major components of seawater
Authors
이석헌정성필김혜원윤택근홍승관
Keywords
Retardation of wetting; Membrane distillation; Visualization system; Chemical softening; Mg addition
Issue Date
2020-05
Publisher
Water research
Citation
VOL 175, 115677
Abstract
Wetting by fouling is phenomenon specific to membrane distillation (MD) and are regarded as challenges to the seawater membrane distillation (SWMD) process. To understand fouling and wetting, the influence of Mg and Sr crystals, which can potentially cause scaling, as well as Ca crystals deposited on the membrane surface were investigated. Mg(OH)2 and CaSO4 had significant impact on fouling and wetting. Even if CaCO3 and SrSO4 had no effects on fouling and wetting as single salts, CaCO3 and CaSO4 were dominant in synthetic seawater without Mg(OH)2. However, the occurrence of Mg(OH)2 scales became a cause for concern if Ca ion was removed from seawater for the prevention of fouling and wetting. Therefore, Mg as well as Ca should be removed for proper fouling and wetting control. NaOH/Na2CO3 softening was used for the removal of Ca and Mg ions. In addition, based on the inhibition effects of Mg ions on Ca scales, a new pretreatment method involving the injection of MgCl2 to increase the Mg /Ca ratio was examined.
URI
http://pubs.kist.re.kr/handle/201004/71109
ISSN
0043-1354
Appears in Collections:
KIST Publication > Article
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