Investigation of Zeolite and Perlite equilibrium isotherms in Sodium Chloride adsorption of the salt waters

Deficiency of water resources is one of the major challenges at the global scale and also in Iran. The existence water resources of oceans and seas such as the Caspian Sea and Persian Gulf in the north and southern parts of Iran respectively, can be considered as the alternative to dominate the future problem. This study is processed absorption of Nacl based-on natural Zeolite and Perlite. In order to obtained of different sizes in five classes, the standard sieves used based on ASTM with determined D of 20, 40, 80, 120 and 200 for granulometric process. The salty water used with different concentration in the range of 25 to 10000 mg/l. To determine the rate of chloramine in samples nitrate of silver with 0.02 mol and potassium chromate used as indicator for detecting of chloramine titration in suspension. The effects of different parameters were examined such as concentration, adsorbent dosage and particles size. The extracted results had indicated that, with declination of the particles size, it can be expected to increase the percentage of sodium chloride removal. Similarly, due to increasing the adsorbent dosage, more absorption will increase in this process. The Freundlich and Langmuir models were used to obtain the isotherm equilibrium curve. The results showed that sodium chloride absorption had a better fitting (R2 97%) using Zeolite from Freundlich model and Perlite also with a meaningful of (R2 96%) in Langmouier model.