کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4487194 1317018 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-pressure membrane (MF/UF) fouling associated with allochthonous versus autochthonous natural organic matter
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Low-pressure membrane (MF/UF) fouling associated with allochthonous versus autochthonous natural organic matter
چکیده انگلیسی

Natural organic matter (NOM) isolates/fractions; organic colloids, and hydrophobic (HPO), transphilic (TPI), and hydrophilic (HPI) fractions; isolated from a natural surface water as an allochthonous source, and in the form of algal organic matter (AOM) derived from blue green algae as an autochthonous source, were investigated in low-pressure membrane filtration. The most significant flux decline was caused by organic colloids, with an intermediate flux decline caused by AOM derived (isolated) from ground and sonicated blue green algae. 3D fluorescence excitation–emission matrix (EEM) analyses revealed that colloids and AOM contain protein-like substances, and FTIR analyses showed overlapping peaks associated with the peptide bonds in proteins and alcohols in polysaccharides originating from extra- and/or intra-cellular materials. HP-SEC results also support a high content of apparently macromolecular compounds in the colloid fraction. The presence of a divalent cation (Ca2+), hypothesized to enhance fouling by NOM acids by a reduction in molecular charge, showed little effect. Morphological analyses indicated that the surface topography of fouled UF membranes was elevated, presumably due to deposition of NOM on the membrane surface. The pores of MF membranes were reduced, suggesting pore blockage and/or constriction by NOM aggregates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 40, Issue 12, July 2006, Pages 2357–2368
نویسندگان
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