کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9681104 1455511 2005 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of algae on fouling and efficiency of UF membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Effect of algae on fouling and efficiency of UF membranes
چکیده انگلیسی
For UF/MF and NF membrane process for the drinking water treatment, algae have been known to directly or indirectly affect membrane filtration. During algae bloom, transmembrane pressure seriously increases or flux significantly decreases. Algae can also produce taste and odor causing compounds such as 2-methyl isoborneol (2-MIB) and geosmin as well as toxic materials. In this study, microcystis aeruginosa was evaluated as a representative algae with an UF membrane in terms of fouling mechanisms by algae. The size and surface charge of microcystis were 2.8 μm and −12.35 mV, respectively, as measured by electrophoresis light scattering method. 10 μm silica was used to serve as a secondary membrane which was expected to remove smaller particles (i.e., here microcystis) before they reach the membrane surface. However, silica did not effectively act as the secondary membrane for microcystis contrarily to expectation. Combination of microcystis and natural organic matter (NOM) provided higher flux decline than either of microcystis and NOM filtration with the UF (EW) membrane. Concentration polarization (CP) thickness of microcystis on the EW membrane was calculated by both convection-diffusion-electrophoretic migration (CDE) and convection-diffusion (CD) models with consideration of the negative charge of membrane and algae. The CP thickness estimated by the CDE model was higher than that by the CD model. And, microcystis fouled on the membrane surface could be more effectively cleaned by 100 ppm NaOCl solution than 0.025 N NaOH solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 179, Issues 1–3, 10 July 2005, Pages 203-214
نویسندگان
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