DOI: 10.1016/j.desal.2020.114335
论文题名: Transport and structural properties of osmotic membranes in high-salinity desalination using cascading osmotically mediated reverse osmosis
作者: Chen X. ; Boo C. ; Yip N.Y.
刊名: Desalination
ISSN: 119164
出版年: 2020
卷: 479 语种: 英语
Scopus关键词: Composite membranes
; Desalination
; Energy efficiency
; Osmosis membranes
; Reverse osmosis
; Environmental challenges
; High salinity brines
; Membrane transport
; Morphological changes
; Structural parameter
; Thin film composites
; Transport modeling
; Water and salt transports
; Structural properties
; desalination
; hypersaline environment
; membrane
; permeability
; pollutant removal
; pollutant transport
; reverse osmosis
; salinity
; water flux
英文摘要: Management of high-salinity brines is a global environmental challenge. Recently, we proposed a novel cascading osmotically mediated reverse osmosis (COMRO) technology for energy-efficient hypersaline desalination. In this study, a transport model is established for COMRO. We investigate the impacts of hydraulic pressure and salinity on transport and structural properties of thin-film composite osmotic membranes in COMRO. Our results show that transport properties are not affected by transitory pressure changes on the order of hours. But on longer timescales, on the order of days, the membrane undergoes compaction/relaxation in response to pressurization/depressurization, with water and salt permeabilities declining/recovering accordingly. Importantly, the water and salt permeabilities change in the same proportion. We found that this is due to morphological changes of the active-support interlayer altering the effective membrane area. The membrane structural parameter is demonstrated to be consistent at different salinities. As salinity increases, both water and salt permeabilities increase, but salt permeability rises substantially more. Lastly, the presented transport model is validated by good agreement between experimental and predicted water fluxes. This study advances the understanding of membrane transport and structural properties in the emerging COMRO technology, and provides insights into water and salt transport for other osmotic membrane processes. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158528
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027-6623, United States; Columbia Water Center, Columbia University, New York, NY 10027-6623, United States
Recommended Citation:
Chen X.,Boo C.,Yip N.Y.. Transport and structural properties of osmotic membranes in high-salinity desalination using cascading osmotically mediated reverse osmosis[J]. Desalination,2020-01-01,479