سال انتشار: ۱۳۸۸

محل انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو

تعداد صفحات: ۹

نویسنده(ها):

S Mafirad – Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O.Box 11155-4563, Tehran, Iran
M.R Mehrnia – Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O.Box 11155-4563, Tehran, Iran
H Azami – Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O.Box 11155-4563, Tehran, Iran
M.H Sarrafzadeh – Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O.Box 11155-4563, Tehran, Iran

چکیده:

Influence of membrane material and pore size on the performance of submerged membrane bioreactors (sMBR) for oily wastewater treatment was investigated. The sMBR has a working volume of about 19L with flat sheet modules at the same hydrodynamic conditions. Five types of micro and ultra polymeric membranes, cellulose acetate (CA), cellulose nitrate (CN), polyamide (PA), polyvinylidene flouride (PVDF) and polyethersulfone (PES) were used and their filtration performance as permeability, permeate quality and fouling intensity were evaluated. For characterization of the membranes, pore size distribution, contact angle and scanning electronic microscopy (SEM) microphotograph of them were prepared. The quality of each membrane permeate was identified by measuring of chemical oxygen demand (COD). The results showed more irreversible fouling intensity for membrane with larger pore size can be due to more permeation of bioparticles and colloids inside the pores. Membrane characteristics have major role in preliminary time of the filtration before cake layer formation so that the PA with highest hydrophilicity had the lowest permeability decline by fouling in this period. Also, the PVDF and PES membranes had better performance according to better permeate quality in preliminary time of the filtration related to smaller pore size and also their better fouling resistance and chemical stability properties. However, all the membranes resulted in the same permeability and permeates quality after cake layer formation. An overall efficiency of about 95% in COD removal was obtained for oily wastewater treatment by the membranes used in this study.