In this research, the efficiency of electrocoagulation treatment process using iron and aluminum electrodes to treat synthetic wastewater containing Reactive Red 24 (RR 24) was studied. The effects of parameters such as current density, pH, type of electrolyte, initial dye concentration, electrolyte concentration, temperature, and inter electrode distance on dye removal efficiency were investigated. The results showed that dye and chemical oxygen demand removals were 99.6% and 91.5% by using iron and were 97.9% and 83.8%, by using aluminum electrodes. The removal of dye exhibited pseudo first order with good correlation coefficients (0.955 and 0.990 for Fe and Al electrodes respectively. It can be concluded that electrocoagulation process by Iron electrode is very efficient and clean process for reactive dye removal from colored wastewater.

No abstract

The main purpose of this work was to assess the removal of the herbicide oxyfluorfen and chemical oxygen demand (COD) in aqueous solution using the electrocoagulation process. The results showed that the maximum removal efficiency for oxyfluorfen and COD were (98.5% and 90%), (99.2% and 85%) and (96.1% and 70.5%) at 30 min by using iron (Fe), stainless steel (S.S) and aluminum (Al) as anode respectively, at a current density of 75 mA.cm-2 and pH of 5.8. The energy consumption in the electrocoagulation process at optimum conditions (15.9, 16.65 and 14.1 KWh/m 3) using Fe, SS and Al electrodes respectively. The adsorption of oxyfluorfen preferably fitting the Freundlich adsorption isotherm. The adsorption process follows the first order kinetic model with good correlation. Figure 3: Effect of initial pH and COD on the removal efficiency of oxyfluorfen using Fe (a) S-S (b) and Al (c) electrodes. Initial concentration of the oxyfluorfen=200 mg/L, [NaCl]=1 g/L, current density=75 mA/cm 2 , inter-electrode distance=1 cm, temperature=10°C. efficiency of herbicides and COD dropped. This may be attributed to the formation of an adherent film on the anode surface which poisons the electrode surface [23]. Effect of electrolyte concentration (g.L-1) The conductivity of the water is adjusted to the desired values by adding NaCl [24]. Figure 5 represent the effect of electrolyte Figure 7: Effect of temperature and COD on the removal efficiency of oxyfluorfen using Fe (a) S-S (b) and Al (c) electrodes. Initial concentration of the oxyfluorfen=200 mg/L, [NaCl]=1 g/L, pH=5.8, a current density=75 mA/cm 2 , interelectrode distance=1 cm. Mass of loss from anode electrode The maximum possible mass of Fe and Al electrochemically generated from sacrificial anodes for a particular electrical current was calculated using Faraday's law of electrolysis [36]: Figure 8: Reaction between LnA t against the time for oxyfluorfen removal using Fe (a) S-S (b) and Al (c) electrodes. initial concentration of the oxyfluorfen=200 mg/L, [NaCl]=1 g/L, pH=5.8, a current density=75 mA/cm 2 , inter-electrode distance=1 cm, temperature=10°C. 26. Dalvand A, Gholami M, Joneidi A, Mahmoodi NM (2011) Dye removal, energy consumption and operating cost of electrocoagulation of textile wastewater as a clean process. CLEAN-Soil, Air, Water 39: 665-672. 27. Daneshvar N, Sorkhabi HA, Kasiri MB (2004) Decolorization of dye solution containing Acid Red 14 by electrocoagulation with a comparative investigation of different electrode connections. Journal of hazardous materials 112: 55-62. 28. Liu H, Zhao X, Qu J (2010) Electrocoagulation in water treatment. InElectrochemistry for the Environment 245-262.

No abstract

In this paper, the feasibility of electrocoagulation technique for the adsorption of Styrene acrylate SA from aqueous solution has been studied. The results showed that SA and COD removal were (99.2% and 95.9 %), (99.4% and 97.1%) and (99 % and 93.1 %) by using iron Fe, stainless steel S-S and aluminum Al electrodes at 8 min respectively. The adsorption equilibrium were analyzed by Langmuir and Freundlich isotherm models. It was found that the data fitted to Freundlich (R² = 0.944) better than Langmuir (R² = 0.674) model. The adsorption of SA exhibited pseudo first order with rate constant (0.932, 0.913 and 0.942 min-1) using Fe, S-S and Al electrodes. The consumption of electrical energy for SA at optimum conditions as follows: (0.283, 0.243 and 0.18 KWh/m3) using Fe, S-S and Al electrodes respectively. Keywords: Styrene acrylate; Electrocoagulation; Water Treatment; Electrode; Adsorption; Kinetics;