Health and environment
Alireza Rahmani; Mostafa Leili; Jamal Mehralipor; Marzihe bagheri; Amir shabanloo; sonia chavoshi
Volume 26, Issue 2 , July and August 2019, , Pages 225-232
Abstract
Background: The use of (advanced oxidation processes) AOPs, due to have high performance in degradation of organic compounds is growing. Combined use of electrical current and sulfate free radical creates a synergy effect on removal of pollutant. The aim of this study was to evaluation the performance ...
Read More
Background: The use of (advanced oxidation processes) AOPs, due to have high performance in degradation of organic compounds is growing. Combined use of electrical current and sulfate free radical creates a synergy effect on removal of pollutant. The aim of this study was to evaluation the performance of activated per sulfate by the electrochemical method with copper – iron electrodes for removal of Aniline from aqueous solution.Materials and Methods: In this experimental study, a batch electrochemical reactor with a useful volume of 250 mL, copper and iron electrodes with 2×10×50 mm area from the DC source to aniline degradation was used. Also the Influence of parameters such as pH, Voltage (with amper), initial concentration of per sulfate and initial concentration of Aniline was investigated. Aniline concentrations, determined by spectrophotometer DR5000 making HACH.Results: The experimental results indicated that the removal of aniline was influenced by different operational parameters, So that the highest process efficiency was obtained at pH 4, a voltage of 11 V, a concentration of per sulfate anions equal to 750 mg /L and a concentration of 60 mg /L of pollutant, 90.41% in a 25 minute period. It was also found that with an increase of nitrogen gas, efficiency will be increase and aeration reduces efficiency.Conclusion: The present study demonstrated the proper performance of the process in removing organic pollutants under optimal conditions of use as well as an alternative technology for the treatment of industrial wastewater containing Aniline.
Mohammadtaghi Samadi; Monireh Tarlani Azar; Halimeh Almasi; Samaneh Shanehsaz; Roya Harati
Volume 22, Issue 4 , September and October 2015, , Pages 699-707
Abstract
Background & Objectives: Fluoride concentration in drinking water is one of the effective parameters in human health, and the majority of the body's requirement for fluoride is supplied through drinking water. Fluoride in low concentration is essential for human but in high concentration is very ...
Read More
Background & Objectives: Fluoride concentration in drinking water is one of the effective parameters in human health, and the majority of the body's requirement for fluoride is supplied through drinking water. Fluoride in low concentration is essential for human but in high concentration is very hazardous for human health. In the present study, the efficiency of modified-clay and lime-marl as adsorbents was investigated for the elimination of fluoride from aqueous solution. Material & Methods: This experimental study was conducted at the Hamedan University of Medical Sciences in 2014. The effects of several parameters such as pH (4, 7 and 10), the adsorbent dosage (1, 5 and 10 g/L), initial concentration of fluoride (5, 10 and 15 mg/L), contact time (15-120 min) on the removal have been studied. Also, the structural characteristics of both adsorbents were evaluated using X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR). Results: According to the results obtained, the removal efficiency of fluoride, at concentration 10 mg/L and the approximate time of 60 min, in the case of clay-modified adsorbent is 95.23% and in the case of lime-marl adsorbent is about 28.71%. Langmuir and Freundlich coefficients were determined in the optimum conditions, and the adsorption isotherm could be described by the Langmuir model(R2=0.9907). Kinetic study showed that the equilibrium time was 60 min. The adsorption kinetics fitted well with the Ho pseudo second-order kinetic model (R2=0.994). Conclusion: According to our finding, it is proposed that the adsorption process of fluoride by clay-modified is very efficient and economics for fluoride removal from aqueous solution.