Investigation of Fouling Reduction Methods of Reverse Osmosis Membrane Used for Treatment of Ion Exchange Resins Regeneration Wastewater
سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,152
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شناسه ملی سند علمی:
ICAWTR01_216
تاریخ نمایه سازی: 20 اردیبهشت 1390
چکیده مقاله:
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.
کلیدواژه ها:
نویسندگان
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