Mohammad Malakootian; Marzie Javdan; Farnaz Iranmanesh; Kamyar Yaghmaeian
Volume 23, Issue 3 , July and August 2016, , Pages 540-549
Abstract
Background Intake of high concentration of fluoride causes health problems in human. Therefore, finding a way for removing excessive fluoride from water is among the most important tasks in water supply projects. How to remove excess fluoride from water is the objective of this project, and as a case ...
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Background Intake of high concentration of fluoride causes health problems in human. Therefore, finding a way for removing excessive fluoride from water is among the most important tasks in water supply projects. How to remove excess fluoride from water is the objective of this project, and as a case study, it was carried out with the aim of investigating the efficiency of bauxite ore in Tash mine in removing fluoride.Materials & Methods The study was performed in a laboratory scale on a synthetic sample collected from the water of Kuhbonan region in the Environmental Health Research Center of Kerman. The adsorbent was prepared from bauxite of Tash mine in Semnan Province. Bauxite analysis was carried out by X-ray fluorescence and diffraction spectrometry methods. The effects of such parameters such as pH, contact time, the adsorbent amount, and different fluoride concentrations on the removal process were investigated. The experiments were performed on real water sample under optimal conditions. To better understand the adsorption process, kinetics and isotherm of the adsorption were investigated, too. The level of fluoride was determined by SPADNS method. For data analysis, Excel software was used.Results The maximum obtained fluoride removal efficiency was 68.20% in a synthetic sample, at pH=7, contact time of 120 minutes, by using 25 g/L bauxite. This level was obtained 45.84% in the real sample under optimal conditions. Adsorption of fluoride followed Langmuir adsorption isotherm equation with a correlation coefficient of 0.991 and second-order model with a correlation coefficient of 0.985.Conclusion Without preliminary preparation, the bauxite of Tash mine can be used as an inexpensive and effective absorbent for removing fluoride from groundwater with low concentrations of fluoride.
Mohammad Malakotian; Ali Asadipour; Somayyeh Mohammadi Senjedkooh
Volume 23, Issue 1 , May and June 2016, , Pages 110-121
Abstract
Background & Objectives: Textile industry is one of the largest industries producing dying wastewater. Discharge of this wastewater to acceptor waters endangers aquaticslife through reducing light transmission, reducing dissolve oxygen, and increasing COD. This study investigated the efficiency of ...
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Background & Objectives: Textile industry is one of the largest industries producing dying wastewater. Discharge of this wastewater to acceptor waters endangers aquaticslife through reducing light transmission, reducing dissolve oxygen, and increasing COD. This study investigated the efficiency of calcium peroxide nanoparticles in removal of Reactive Red 198 from synthetic wastewater and wastewater of YAZDBAF textile factory. Materials & Methods: This experimental study was performed in spring and summer of 2014 in Environmental Health Engineering Research Center of Kerman University of Medical Science. Characteristic of synthesized nanoparticles was determined by TEM and XRD. Adsorption experiments in batch system were performed on synthetic sample and real wastewater. The effect of solution pH (3-13), initial concentration of dye (10-300 mg/L), contact time (5-90 min) and adsorbent dosage (0.05-0.6 g) was investigated and adsorption isotherms were determined. Data was analyzed by SPSS version 21, Excel 2007 softwares and Pearson correlation coefficient. Results: Synthesized adsorbent particles had uniformly spherical shape with approximately diameter of 15-25 nm. The optimum pH for removal of reactive red 198 was 3-7. The equilibrium contact time was 50 minutes and optimum dosage of adsorbent was 0.4 g/100 mL. In these optimum conditions, removal efficiency in synthetic and real sample was 99.58 and 76.18 percent, respectively. Conclusion: Based on the results, calcium peroxide is an efficient adsorbent in removing reactive red 198 and, with attention to simplicity of synthesis, it can be used as an applied in treating textile wastewaters.