Direct Contact Membrane Distillation with Crystallization Applied to NaCl Solutions

Gryta, M. Direct Contact Membrane Distillation with Crystallization Applied to NaCl Solutions Chemical papers, Vol.56, No. 1, 2002, 14-19

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
 
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Author(s) Gryta, M.
Title Direct Contact Membrane Distillation with Crystallization Applied to NaCl Solutions
Journal name Chemical papers
Publication date 2002
Year available 2002
Volume number 56
Issue number 1
ISSN 0366-6352
Start page 14
End page 19
Place of publication Poland
Publisher Versita
Collection year 2002
Language english
Subject 290000 Engineering and Technology
291100 Environmental Engineering
Abstract/Summary Preparationof NaCl supersaturated solutions by direct contact membrane distillation (DCMD)integrated with salt crystallization has been studied. For the purpose of thisstudy a module assembled from macroporous polypropylene capillaries was used.The feed temperature was kept at 353 K or 358 K, and the temperature ofdistillate stream was changed from 293 K to 328 K. Salt crystallization on themembrane surfaces has been observed during the process when the distillate temperaturewas kept below 308 K. As a consequence of that phenomenon an increase ofmembrane wettability and reduction of the distillate flux were observed. Whendistillate temperature was raised to 328 K, salt crystallization on themembrane surfaces was eliminated, and permeate flux was stabilized during theprocess runs. After 138 h of the process operation, the permeate flux decrease ofabout 40 % was observed. Additionally, the DCMD process integrated withcrystallization yielded average NaCl production of 55 kg m−2 d−1.
 
 
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