کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
641488 1457001 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reversible and irreversible compaction of ultrafiltration membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Reversible and irreversible compaction of ultrafiltration membranes
چکیده انگلیسی


• A novel UTDR tool is used in on-line monitoring of membrane compaction.
• Significant differences were found in compaction tendency of different membranes.
• It seems that both the selective skin layer and the layers below the skin layer compact.

This study evaluates differences in reversible (after relaxation) and irreversible compaction and the effect of compaction on the performance of three different ultrafiltration membranes. The evaluation is based on results from both off-line and on-line measurements of compaction. The on-line measurements were done with an ultrasonic time-domain reflectrometry (UTDR) tool with improved resolution compared to tools used in earlier studies.The results reveal that the regenerated cellulose membrane compacted significantly more than the tested polyethersulphone membranes. This dissimilarity originates from the different membrane materials used and from significant differences in the membrane structures. It is also found that measurements of membrane compaction, whether made on-line or off-line, are not predictive for membrane performance. For instance, compaction of the UH030 membrane was negligible but its permeability decrease and retention increase due to the compaction were significant. Compaction decreased the cut-off values of the 30 kDa membranes to lower than 8 kDa. The results thus indicate that the skin layers of the membranes compact significantly causing remarkable changes in membrane performance. Thickness changes occurring in the scale of skin layer thicknesses are out of the resolution limits of methods thus far available for monitoring of membrane compaction in real-time. Real-time measured information on compaction phenomena is further needed to be able to distinguish flux decrease caused by concentration polarization and the effects of reversible compaction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 118, 30 October 2013, Pages 127–134
نویسندگان
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