بررسي كارايي سه نوع غشاي اسمز معكوس براي تصفيه پساب احياي رزين هاي تعويض يوني

Performance Evaluation of Three Kinds of Reverse Osmosis Membranes for Treatment of Ion Exchange Resins Regeneration Wastewater

In this research, we try to use the three kinds of Reverse Osmosis membranes for treatment of ion exchange resins regeneration wastewater, which currently this wastewater is discharged to evaporation lagoons after neutralization. The common methods used for the disposal of these kinds of wastewater in the environment consist of discharge to brackish or saline receiving waters, deep-well injection, and in the case of small facilities, discharge to wastewater collection systems. Despite numerous researches about using membrane processes for industrial wastewater treatment, there was no study or research about using reveres osmosis for treatment of wastewater form ion exchange regeneration process. So, considering the similarities between this kind of wastewater and brackish water or saline water, it has been hypothesized that reverse osmosis has ability to remove dissolved solids from this kind of wastewater; therefore it is necessary to conduct feasibility tests of membrane samples. Feasibility tests can be done by using membrane cell in pilot plant. Thus, we need to provide a pilot plant which has membrane cell and facilities to indicate and control of pressure, temperature and flow to evaluate and investigate the wastewater treatability. Although, at this kind of pilot plant, usually spiral wound RO membrane is used, to achieve the better results with low expenses, the bench scale instruments such as membrane cell were used. In this method, we can use a small sheet of membrane about 10x 15 (cmxcm) that sandwiched between two steel part which can tolerate high pressure. The pilot plant designed and set up according to fig.(I).The main parts of pilot plant consist of wastewater tank with 250 liter volume, low pressure pump, cartridge filters, high pressure pump, membrane cell and devices for pressure and temperature control