Vacuum membrane distillation of liquid desiccants Utilizing Hollow Fiber Membranes
Srivatsa Bettahalli, N.M.
Fedoroff, Nina V.
Nunes, Suzana Pereira
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Biological and Environmental Science and Engineering (BESE) Division
Center for Desert Agriculture
Emeritus Distinguished Professor of Biosciences, KAUST, Thuwal, 23955-6900, Saudi Arabia
Environmental Science and Engineering Program
Nanostructured Polymeric Membrane Lab
Physical Science and Engineering (PSE) Division
Water Desalination and Reuse Research Center (WDRC)
Online Publication Date2018-01-31
Print Publication Date2018-06
Permanent link to this recordhttp://hdl.handle.net/10754/627020
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AbstractThis paper documents the testing of a vacuum membrane distillation system intended for use with liquid desiccants. Liquid desiccants offer the possibility for low-energy, ambient temperature dehumidification. Effective desalination and purification of diluted desiccants outputs two important products: a concentrated desiccant for reuse in dehumidification and fresh water. In this study, vacuum membrane distillation was used in the laboratory to purify diluted liquid desiccants. Calcium chloride and magnesium chloride were the desiccants selected for testing. Desiccant solutions were pumped through the lumens of poly(vinylidene fluoride) (PVDF) hollow fiber membranes at varying feed inlet temperatures, solution velocity rates and vacuum set points during membrane distillation. An average flux of 8 kg m-2 h-1 was obtained using 30 wt% magnesium chloride solution at a temperature of 50 °C while applying vacuum to achieve 25 mbar absolute pressure on the air side of the membrane. The results are promising for the development of a full-scale vacuum membrane distillation process for desiccant solution regeneration and fresh water recovery. In addition, the recovered condensate was of sufficient quality for use in agricultural irrigation or drinking water.
CitationLefers R, Srivatsa Bettahalli NM, Fedoroff N, Nunes SP, Leiknes T (2018) Vacuum membrane distillation of liquid desiccants Utilizing Hollow Fiber Membranes. Separation and Purification Technology. Available: http://dx.doi.org/10.1016/j.seppur.2018.01.042.
SponsorsThe research reported in this publication was sponsored by King Abdullah University of Science and Technology (KAUST). The authors thank colleagues from the Nanostructured Polymeric Membrane (NPM) group, as well as the Water Desalination and Reuse Center (WDRC), and KAUST’s Core Labs for their help on equipment and analysis.