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- ArticleYalnız künye2003Investigation on settling velocities of aluminium hydroxide-dye flocs
Gürses, Ahmet; Yalçm, Mehmet; Doǧar, Çetin
The settling velocity of flocculated materials is one of the most important factors for the appropriate design and the effective operation of wastewater treatment plants. In this study, the effect of some variables, such as settling temperature and Ph, concentrations of a cationic surfactant and an electrolyte on the settling velocity of aluminium hydroxide-dye flocs have been investigated. The aluminium hydroxide was produced by dissolving metallic aluminium under high temperature in alkaline medium. The dyestuff chosen for this study is a reactive textile dye, Remazol Red RB. Cationic surfactant (CTAB) and electrolyte (NaCl) were used as settling aids. The experimental results showed that the settling velocity generally increased with the increasing settling temperature, Ph and dye concentration. By using the experimental data related to the temperature an empirical equation was developed and the Ea values for the settling process of the flocs with dye and without dye were determined as 20.40 kJ and 14.17 Kj, respectively.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2003Decolorization and Sedimentation of a Textile Dye by Dissolution of Metallic Aluminum: A Statistical Investigation
Gürses, Ahmet; Yalcin, Mehmet; Dogar, Çetin; Doymus, Kemal
In this study, the decolorization and sedimentation of strong colored solutions containing a reactive textile dye, Remazol Red RB, were investigated. Aluminum hydroxides from dissolution of metallic aluminum were used as flocculant. Experiments were performed according to "24 full factorial experimental design." By using MINITAB software, analysis of variance was carried out. The parameters investigated were aluminum dissolution temperature, initial pH, aluminum dissolution time, and effect of surfactant. Aluminum dissolution temperature and dissolution pH were found to be statistically significant parameters in the decolorization process. From the variance analysis of settling rate, the amount of dissolved aluminum and the mean distribution of floc size, it was found that pH was a significant parameter common in all of these processes. These results suggest that decolorization by flocculation with direct dissolution of metallic aluminum may be practically used for the removal of reactive dyes from aqueous solutions.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2003Removal of Remazol red RB by using AI (III) as coagulant-flocculant: Effect of some variables on settling velocity
Gürses, Ahmet; Yalçin, Mehmet; Dogar, Cetin
This study addresses the research of the removal of a textile dye from aqueous solutions by using aluminum ions as coagulant-flocculant. A simulated textile wastewater was prepared from Remazol Red RB textile dye. The purpose of this study was to investigate the effects of temperature, pH, and concentrations of the cationic surfactant and electrolyte concentration on the settling velocity of the simulated textile wastewater. While investigating these factors, levels of variables were determined by considering the characteristics of traditional textile wastewater like pH, temperature, and dye concentration. Although traditional coagulation-flocculation processes make use of different aluminium salts as coagulant-flocculent, in this study, Al ions dissolved in pH and temperature of traditional textile wastewater were used. Furthermore, sludge volume index values (SVI) were determined and conductivity measurements carried out. The results showed that, in the working range of these variables, the spectroscopic color measurement revealed 100% decolorization yield of wastewater. In conclusion, researchers found that the optimum settling velocity conditions were as follows: low temperature (273K), surfactant concentration of 0.10 g L-1, electrolyte concentration of 0.10 g L-1, dye concentration of 0.025 g L-1 and a pH of 10.05. Finally, by conducting experiments twice under the obtained optimum values, mean settling velocity was 0.014 m min-1 and the mean sludge volume index 140 mL g-1.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2002Electrocoagulation of some reactive dyes: A statistical investigation of some electrochemical variables
Gürses, Ahmet; Yalçin, Mehmet; Doar, Cetin
In this study, the decolorization of strong colored solutions containing the reactive textile dyes by electrocoagulation was investigated. The experiments were statistically designed and carried out according to a 24 full factorial design with two replicate and four center points. This design was extended with eight additional axial points. Then, the non-linear regression was applied on the data by using MINITAB software. The variables chosen for this work are mixing rate, cell voltage, electrolysis time and current density. Results showed that the effective variables on decolorization process are cell voltage, electrolysis time and current density. In addition, to determine the effect of dye and electrode type on decolorization, the additional experiments were carried out. It was determined the dye and electrode type are important on the decolorization process.
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