کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
7008008 1455263 2018 8 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
The role of nanofiltration membrane surface charge on the scale-prone ions concentration polarization for low or medium saline water softening
ترجمه فارسی عنوان
نقش شارژ سطحی غشاء نانوفیلتراسیون بر پلاریزاسیون غلظت یون های مستعد مقیاس برای کاهش کم و متوسط ​​نرم شدن شور
کلمات کلیدی
نانوفیلتراسیون، سطح غشاء سطح، نیمه پتانسیل، قطبش تمرکز، قدرت یونیک،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی
Based on the fact that when inlet bulk solution with low or medium concentration was involved, scaling was apt to appear on nanofiltration (NF) membrane surface in retentate side. Therefore, study on its surface charge performance under threshold concentration condition is necessary. Two polyamide composite NF membranes (DL and DK) were characterized with streaming potential (Es), zeta (ξ) potential and other measurements encountering with a wide ionic strength range (1.5-108 mol·m−3). Then, the interactional relations between membrane surface charge and concentration polarization (CP) degree, along with the relevant constituting factors were investigated. The results showed that even when the sparingly soluble salt concentration for CaSO4 exceeded its threshold point, both NF membranes at pressure drop of 180 kPa still exhibited low and medium-intensity surface electrokinetic phenomena (−5.94 ≤ Es ≤ −3.41 mV; −38.82 ≤ ξ-potential ≤ −36.34 mV). It turned out that solvent flux decreased almost linearly, but measured concentrations of the scalant ions in NF retentate streams increased slightly at first and then rapidly with the enlargement of ξ-potential, respectively. Meanwhile, mass transfer coefficient and boundary layer thickness had a negligible change in the scope of testing ξ-potential. Therefore, CPSO42− and CPCa2+ decreased apparently with ξ-potential becoming less negative for the adopted NF membranes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 432, 15 April 2018, Pages 81-88
نویسندگان
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