ارزیابی کارایی خاک اره درخت زیتون تلخ در حذف رنگ و فلزات سنگین از فاضلاب صنایع نساجی

Introduction  Dyes and heavy metals are hazardous pollutants often found together in wastewaters of textile industries; these pollutants have a significant ecological impact on the ecosystem and can modify the physical and chemical properties of water affecting the aquatic flora and fauna. Methods  This fundamental-applied study was done on lab scale. Effects of various factors including dye initial concentration(5-50 mg/L), Cu initial concentration(1-10 mg/L), pH(2-10), adsorbent dose(1-8 g/L), and contact time(5-90 min) in the sorption dye and Cu were determined by using sawdust Melia Azedarach tree. The study was designed to experiments the response surface methodology. Result The most performance in dye and Cu removal were gained 98.03%, and 99.90% respectively. Increasing adsorbent dose showed the most positive effect, whereas initial dye concentration can cause performance falling on dye removal. Also, increasing pH showed the most positive effect, whereas initial dye concentration can cause performance falling on Cu removal. In this study, the data analysis of isotherm studies is more compatible with Langmuir model. An R2 value in Langmuir isotherm was determined 0.994 for dye and 0.9712 for Cu.  Furthermore, the kinetic results showed the best fit with pseudo-second-order model. Show the R2 value determined same and equal amounts of 9998/0 for dye and Cu.  Conclusion Sawdust as an effective method used in dye and heavy metal removal in aqueous solution.