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Elimination of natural organic matter by electrocoagulation using bipolar and monopolar arrangements of iron and aluminum electrodes
Authors:M Alimohammadi  M Askari  M H Dehghani  A Dalvand  R Saeedi  K Yetilmezsoy  B Heibati  G McKay
Institution:1.Department of Environmental Health Engineering, School of Public Health,Tehran University of Medical Sciences,Tehran,Iran;2.Center for Water Quality Research (CWQR), Institute for Environmental Research (IER),Tehran University of Medical Sciences,Tehran,Iran;3.Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health,Shahid Sadoughi University of Medical Sciences,Yazd,Iran;4.Department of Health Sciences, Faculty of Health, Safety and Environment,Shahid Beheshti University of Medical Sciences,Tehran,Iran;5.Department of Environmental Engineering, Faculty of Civil Engineering,Yildiz Technical University,Istanbul,Turkey;6.Division of Sustainability, College of Science and Engineering,Hamad Bin Khalifa University,Doha,Qatar
Abstract:The aim of this research was to evaluate the efficiency of electrocoagulation (EC) for the removal of natural organic matter (NOM) by using iron (Fe) and aluminum (Al) electrodes. The effects of several operational parameters such as initial pH (3–10), time of electrolysis (5–30 min), initial concentration of organic matter (10–50 mg NOM/L), current density (0.25–1.25 mA/cm2), type of electrode material (n = 4, 2 sides × 11 cm × 10 cm, wall thickness = 2 mm, distance between each electrode = 5 mm), and type of connection of electrodes (bipolar and monopolar configurations) were explored for the removal of NOM from synthetic humic acid solution in a 2 L laboratory-scale EC cells (A s/V = 0.110 cm?1). The optimum conditions for the process were identified as pH = 3 and 7, electrolysis time = 20 and 10 min for Fe and Al electrodes, respectively. Using both electrodes at current density = 0.25 mA/cm2 and initial concentration of organic matter = 50 mg/L, a NOM removal efficiency of almost 100% could be achieved in the bipolar mode. Based on the optimum conditions, specific reactor electrical energy consumptions were 14.90 kWh/kg Al (or 0.092 kWh/m3) and 2.88 kWh/kg Fe (or 0.11 kWh/m3). Specific electrode consumptions were obtained to be 0.0062 and 0.0382 kg/m3, and operating costs of the EC system were preliminary estimated at 0.057 and 0.119 $/m3 for Al and Fe electrodes, respectively.
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