Document Type : Original Article
Authors
1
Student of research Committee Sabzevar University of Medical Sciences, Sabzevar, Iran
2
Faculty Member, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
3
Associated of Environmental Health Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
4
Student PHD of Environmental Health Engineering, Iran University of Medical Sciences, Iran, Iran
5
Associated Professors of Environmental Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
6
Student of research Committee Sabzevar University of Medical Sciences, Sabzevar, Iran.
Abstract
Background and Aims: The effluent of textile industries is high dye fully and this is one of most important problems for environmental health engineers. So this study examined the de-colorization of dispersive yellow dye3 by use of coagulation with three different substances (FeCL3 , Al2(SO4)3, Fe2(SO4)3.
Materials and Method: Experiments on dye coagulation and flocculation were performed using a jar test apparatus. The initial experimental pH were (2,4,6,8,10), the dye concentration were (10,15,20,40,60,80) and the coagulation rate (20,40,60,80) were in coagulation-Flocculation process. Standardized set of stirring speeds, i.e., 200rpm for rapid stirring and 40 rpm for slow stirring, was used for comparative purpose. The initial pH of the solution was measured using dilute HCl or NaOH solutions (0.01-0.1M). The collected samples were santerified and analyzed by means of UV-visible spectrophotometry MODEL Hach DR 5000.
Result: The results showed that under most cases FeCL3 had significantly higher efficiency in removal of dispersive yellow33 dye in rations to Al2(SO4)3and Fe2(SO4)3 . Also the change of initial pH was always beneficial for enhancing dye removal. The Dye removal, optimum pH, coagulation dosage and initial dye concentration were found to be 65.24%, 8, 60 mg /L and 4 mg/L, respectively.
Conclusion: It seems that iron hydroxides can neutralize the negative surface charges of dye molecules or trap the dye molecules. Therefore, the sweep flocculation and/or the charge neutralization might play key roles in the enhancing dye removal.
Keywords
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