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Title: Performance enhancement and scaling control with gas bubbling in a direct contact membrane distillation
Authors: Chen, Guizi
Wang, Rong
Fane, Anthony Gordon
Yang, Xing
Keywords: DRNTU::Engineering::Civil engineering::Water resources
Issue Date: 2012
Source: Chen, G. Z., Yang, X., Wang, X., & Fane, A. G. (2013). Performance enhancement and scaling control with gas bubbling in a direct contact membrane distillation. Desalination, 308, 47-55.
Series/Report no.: Desalination
Abstract: This study incorporates gas bubbling into direct contact membrane distillation (DCMD) and examines its effect on the MD performance especially at elevated salt concentrations in the feed steam. Process optimization in the bubbling assisted DCMD process was carried out which involved varying operating conditions and module configurations. Also, observations were performed for the scaling status on the membrane surface with operating time in different modules to further understand the role of gas bubbling in affecting the behavior of crystal deposition when the salt concentration has reached super-saturation. Due to intensified local mixing and physical flow disturbance in the liquid boundary layer on the feed side, a higher flux enhancement could be achieved in a bubbling system with either a higher feed operating temperature, lower feed and permeate flow velocities, inclined module orientation, shorter fiber length or lower packing density. It was also found that gas bubbling not only enhanced the permeation flux by average 26% when concentrating feed solution from 18% salt concentration to saturation, but also delayed the occurrence of major flux decline due to crystal deposition when compared to the module with spacers. These results were confirmed by membrane surface autopsy at different operating stages using SEM.
DOI: 10.1016/j.desal.2012.07.018
Schools: School of Civil and Environmental Engineering 
Rights: © 2012 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by The journal of Desalination, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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