بررسی کارایی خاکستر و پودر پسماند های گلاب گیری در حذف رنگ راکتیو قرمز 198 از فاضلاب صنایع نساجی

Abstract     Background: Wastewater from factories and manufacturing centers because of various compounds, complicates the process of wastewater treatment. Among this industries, the textile, paper pulp, food, pharmacy and leather industry due to consumption of various types of chemicals are the most important importers of color pollutants to environment, which have harmful effects on the natural environment. The aim of this study is investigate of efficiency of ash and powder Rosewater Wastes in removal of Reactive Red 198 from aqueous solutions.   Methods: In this experimental study, after the preparing of powder and ash Rosewater Wastes absorbent, the effect of various parameters of operation such as pH (3-10), the initial concentration of dye (25, 50, 100 and 300 mg/L), contact time (5-180 minutes) and absorbent dose (0.05- 0.6 gr/100 ml) were studied. Finally the results were analyzed by kinetics and isotherm modeling.   Results: In this study, equilibrium time of powder and ash Rosewater Wastes Obtained 60 and 45 minutes respectively. The Maximum efficiency of absorbent powder and ash was obtained 68 and 89 percent, respectively, at pH 3, contact time of equilibrium and adsorbent dosage 0.4 gr/100 ml. isotherm studies matched with Freundlich isotherm models for both absorbents. Kinetic equations followed the pseudo-second of the model better.   Conclusion: The results showed that Powder and ash of Rosewater Wastes can be effective in removal of Reactive Red 198 and be cause a significant increase in absorption of capacity. Therefore according to Enormous resources of Rosewater Wastes in Iran, these cheap and available resources can be used to remove color pollutants from aqueous solutions.