کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10386262 882950 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Desalination by membrane distillation adopting a hydrophilic membrane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Desalination by membrane distillation adopting a hydrophilic membrane
چکیده انگلیسی
Direct contact membrane distillation (MD) by means of composite membranes with a PVA/PEG hydrophilic layeron a hydrophobic PVDF substrate has been developed for desalination. The effects of brine temperature, salt concentration, running time and the addition of ethanol on the flux of composite membranes have been investigated. Results showed that the flux of the composite membrane did not deteriorate by adopting an additional hydrophilic membrane although durability was obviously improved. More than 99% of the separation coefficient in one run was achieved with the conductivity of the produced fresh water in the range of 6-10 μs/cm. The flux of the composite membrane retained 91% flux of substrate at 70°C, being 23.7 kg/h·m2. When the brine temperature rose to 70°C, the composite membrane showed a declined concentration polarisation, with a smaller Cmb/Cb (3.89) than that of the substrate (5.79). Although the flux decreased with the increase of brine concentration, it retained 64% flux of pure water at brine solution containing 20% NaCl and was kept almost constant until 25% NaCl. In the continuous running experiments, there was no obvious drop of flux, even after adding 25% ethanol to the brine and running overnight. It is expected that adopting a hydrophilic layer can prohibit the wetting problem that faced traditional MD with hydrophobic membranes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 173, Issue 1, 1 March 2005, Pages 45-54
نویسندگان
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