سال انتشار: ۱۳۸۸
محل انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو
تعداد صفحات: ۷
K Ghasemipanah – Research Institute of Petroleum Industry, Faculty of Environment, University of Tehran, Tehran, Iran -Petrochemical Research and Technology Company, Tehran, Iran
A Torabian – Department of Environmental Engineering, Faculty of Environment, University of Tehran, Tehran, Iran
S.S Madaeni – Department of Chemical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
In this study, fouling reduction methods of reverse osmosis (RO) membrane for treatment of ion exchange resins regeneration wastewater were evaluated. This wastewater has us/cm. For fouling reduction, we must perform the plan in four steps: feed pretreatment, modification of operation conditions, fouling identification and chemical cleaning. First, we set up a pilot plant to evaluate 4 steps. For feed water pretreatment, we conducted the procedures as lowering turbidity and removal of oxidizing agent by filters and pH adjustment. In order to reduce calcium carbonate scaling probability, the pH adjustment to 7 was done by sulfuric acid. For modification of operation conditions (pressure and cross flow velocity), 9 experiments have been done as a pilot plant in different pressures and cross flow velocities in the membrane cell with the small flat sheets of TORAY seawater membrane .Results showed that 25 bar pressure and 0.54 m/s cross flow velocity with permeate flux equal to 40.6(l/m2.hr) were the optimum wastewater treatment conditions. So with SEM, SEM-EDX, XRD and XRF tests revealed that fouling layer mainly consists of iron oxides. Chemical cleaning with citric acid showed the best results.