Effect of Operating Parameters on Performance of Industral Reverse Smosis Membane with Emphasis on Carbonate and Bi-Carbonate Rejection

Concerning the importance of distilled water chemical specification, studying operational condition effect on product quality is extremely important in Utility Areas. Considering geographical locating of many chemical and petrochemical units in Iran, these facilities are forced to consume brackish water as feed for their utility. Hence, different challenges are formed compared with coastal units use sea water instead. Our sample during this study imports brackish water with E.C≈ 2500, T.H≈550 into the softener resin beds for feed water softening. Then the first R.O. unit is employed to produce DM water with E.C≈ 25, T.H≈0. Finally, the most valuable part of our production chain is another R.O. unit which supplies high purity Distilled water as the feed of Utility. There are several important parameters to evaluate permeate quality or the last unit’s performance including Anions concentration (Na, Ca, Mg, K) and Cations concentration (CO32-, HCO3-, Cl-, SO42-). Clearly. The most important parameter is supposed to be chlorine, Carbone and bicarbonate concentration which was studied during operational tests. Hence, the sensitivity of product quality with process variables such as feed pH, retention time, R.O. element pressure and temperature were examined and adjusted rigorously.