IJE TRANSACTIONS A: Basics Vol. 31, No. 10 (October 2018) 1609-1616   

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A. R. Moghadassi, E. Bagheripour, F. Parvizian and S. M. Hosseini
( Received: February 10, 2018 – Accepted in Revised Form: August 17, 2018 )

Abstract    In the current research, ABS-co-PEG nanofiltration membrane was prepared by solution casting technique using N, N dimethyl acetamide as solvent. The effect of PEG concentration as additive in the casting solution on membrane flux, salt rejection, phase inversion time, water content, membrane porosity, membrane tensile strength and fouling was studied. Also the effect of operating conditions such as feed concentration, pressure and temperature on membrane performance were also studied. It was found that increase of PEG content up to 6 %wt in the casting solution initially led to increase in flux and decrease of salt rejection in prepared membranes. The flux was decreased and salt rejection increased by more increase in PEG content from 6 to 10 %wt. In addition, presence of PEG in membrane structure caused to formation of more stable flux during filtration time against fouling. Increase of feed salt concentration caused to flux decreasing. The ABS/PEG membrane showed more stable flux against increase of feed concentration. Moreover, flux was increased by increase of operating pressure and feed temperature. The results also showed a clear trend towards higher values of tensile strength by increase of PEG content ratio.


Keywords    Nanofiltration, ABS-co-PEG Membrane Fabrication/Characterization, PEG Concentration, Physico-chemical Characterization, Operating Conditions



در اين پژوهش غشای نانوفيلتراسيون بر پايه ABS/PEG به کمک تکنيک قالب گيری محلول پليمری و با استفاده از دی متيل استاميد به عنوان حلال ساخته شد. اثر غلظت ماده افزودني پلي اتيلن گلايکول در محلول پليمری بر فلاکس غشا، جداسازی نمک، سرعت تغيير فاز، محتوای آب و تخلخل غشا، مقاومت مکانيکي و ميزان گرفتگي آنها مورد بررسي قرار گرفت. همچنين اثر شرايط عملياتي از قبيل غلظت خوراک، دما و فشار بر عملکرد غشاها بررسي شد. مشخص شد که افزايش ميزان غلظت پلي اتيلن گلايکول تا 6 درصد وزني در محلول پليمری در ابتدا سبب افزايش ميزان فلاکس و کاهش ميزان جداسازی نمک گرديد. با افزايش بيشتر ميزان غلظت افزودني از 6 تا 10 درصد وزني مجددا فلاکس کاهش و ميزان پس دهي نمک افزايش يافت. همچنين استفاده از PEG در ساختار غشا سبب ايجاد فلاکس پايدار و کاهش ميزان گرفتگي غشا گرديد. افزايش غلظت خوراک نيز سبب کاهش ميزان فلاکس گرديد. غشاهای اصلاح شده حاوی پلي اتيلن گلايکول فلاکس پايدارتری با افزايش ميزان غلظت خوراک داشتند. علاوه بر آن افزايش ميزان فشار عملياتي و دمای خوراک سبب بهبود ميزان فلاکس در غشاها گرديد. نتايج به صورت آشکاری نشان داد که افزايش ميزان ماده افزودني سبب بهبود خاصيت مکانيکي غشاها گرديد.


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