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|Title:||Effect of humic-acid fouling on membrane distillation||Authors:||Tan, Yong Zen
Chew, Jia Wei
Krantz, William B.
|Issue Date:||2016||Source:||Tan, Y. Z., Chew, J. W., & Krantz, W. B. (2016). Effect of humic-acid fouling on membrane distillation. Journal of Membrane Science, 504, 263-273.||Series/Report no.:||Journal of Membrane Science||Abstract:||Membrane distillation (MD) can concentrate non-volatile solutes or remove volatiles and dissolved gases from an aqueous feed. A microporous hydrophobic membrane provides a barrier between the hot feed and cold distillate. Although MD can operate at ambient pressure and moderate temperatures, use waste heat, and treat wastewater via an MD-bioreactor, it has problems such as temperature polarization, liquid weeping to the distillate side, and membrane fouling. Prior studies speculated that fouling can add a heat- or mass-transfer resistance, or cause a vapor-pressure reduction owing to the Kelvin effect, but did not isolate these effects. This study confirms that the vapor-pressure depression owing to the concave interface in the small pores of the fouling layer is a dominant cause of the 25–63% flux reduction observed for humic-acid fouling on PTFE and PVDF membranes. This study underscores the importance of selecting MD membranes based on their pore-size distribution rather than just their nominal diameter in order to maximize the contribution of Knudsen diffusion. It suggests the development of dual-layer membranes having a thin hydrophilic layer with relatively large pores overlying a hydrophobic layer with a typical MD membrane structure in order to mitigate the vapor-pressure reduction owing to membrane fouling.||URI:||https://hdl.handle.net/10356/85720
|ISSN:||0376-7388||DOI:||10.1016/j.memsci.2015.12.051||Rights:||© 2016 Elsevier B.V.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||SCBE Journal Articles|
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