کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
626528 1455443 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced or reduced concentration polarization by membrane fouling in seawater reverse osmosis (SWRO) processes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Enhanced or reduced concentration polarization by membrane fouling in seawater reverse osmosis (SWRO) processes
چکیده انگلیسی

Salt rejection behaviors coupled with membrane fouling in seawater reverse osmosis (SWRO) processes were studied through a lab-scale membrane fouling test. Seawater was taken from Masan Bay, South Korea and foulants such as humic acid (HA), sodium alginate (SA), and silica nanoparticle (S120; particle diameter = 120 nm), were spiked to the seawater for the rapid fouling test. All the test conditions except model foulant were controlled equally. Salt concentration in permeate increases with flux decline even with no fouling because of increased water permeation and relatively constant salt passage. Salt mass transfer can be altered in the presence of fouling layer. Organic foulants such as HA and SA tend to build up denser fouling layer than S120 nanoparticles. Thus, S120 fouling layer induced cake enhanced concentration polarization (CECP) to accelerate salt rejection decreasing rate while HA and SA fouling layer hindered the convection of salt to lead cake reduced concentration polarization (CRCP) decelerating the rate. These combined effects of flux decline, CECP, and CRCP can be the causes of the coupled behaviors of permeate flux and salt rejection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 247, Issues 1–3, October 2009, Pages 162-168