Somayyeh Akberi; Abdolmotalleb Seyyed Mohammadi; Javad Fardmal; Qorban Asgari
Volume 22, Issue 5 , November and December 2015, , Pages 870-878
Abstract
Background: Phenol is one of the toxic saline wastewater pollutants that is considered as priority pollutants since it is necessary treatment and reached the phenol concentration to the level of effluent discharge standard before discharge into the environment. In this study the performance of electro-Fenton ...
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Background: Phenol is one of the toxic saline wastewater pollutants that is considered as priority pollutants since it is necessary treatment and reached the phenol concentration to the level of effluent discharge standard before discharge into the environment. In this study the performance of electro-Fenton process in phenolic saline waste water treatment and the removal degree of COD were investigated. Materials and Methods: In this experimental study a reactor (1 litre) which was equipped to four iron electrodes and a DC power supply used to remove phenol and COD. The effect of operating parameters such as phenol initial concentration, H2O2 dosage, electrolyte concentration, pH, current density, connection time and type of electrode connection were investigated. Results: The results showed that this process using iron electrodes with parallel monopole connections is able to leave out the phenol from saline waste water by 96% and the removal COD equals 59% in operating conditions: pH= 3, initial phenol concentration=500mg/l, H2O2 concentration = 150 mg/L, Hydrogen peroxide at a current density = 15 mA/cm2at 10 minutes. Conclusion: The results showed that electrochemical processes can be considered as a better suitable substitute rather than other methods due to saline content and high electrical conductivity in saline wastewater.
Alireza Rahmani; Jamal Mehralipor; Nader Shabanloo; Firoozeh Zaheri; Yosef Poreshgh; Amir Shabanloo
Volume 21, Issue 5 , September and October 2014, , Pages 797-807
Abstract
Background: Usually, to produce radical sulfate, persulfate anions can be activated by heat, UV light and transition metals such as iron ions. The purpose of this study was investigation of performance of persulfate activated with iron produced by electrical method using iron anode electrode in degradation ...
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Background: Usually, to produce radical sulfate, persulfate anions can be activated by heat, UV light and transition metals such as iron ions. The purpose of this study was investigation of performance of persulfate activated with iron produced by electrical method using iron anode electrode in degradation of Acid Blue 113 from aqueous solutions.
Materials and Methods: In this study, a lab-scale electrochemical batch reactor equipped with four iron electrodes and a DC power supply was used for removing of Acid Blue 113. The effect of operating parameters such as initial pH, voltage, persulfate and initial Acid Blue 113 concentration were evaluated. Also, the amount of pH changes during the process, the synergistic effect of processes in the system and Acid Blue 113 UV-Vis spectrum analysis in optimal conditions was investigated.
Results: The results showed, initial pH of solution, initial concentration persulfate and applied voltage has a significant effect on dye removal. Dye removal efficiency was higher in acidic condition and decreased with increasing pH, So that, after 2 min of reaction at pH 3, voltage 10 V and 150 mg/L of persulfate, 98% of the dye was removed, at pH 5, 7, 9 and 11, after 2 min of reaction and in the same condition the dye removal efficiency was, 66, 0, 0 and 13.5%, respectively. With increasing voltage from 1 to 10 V, increased the dye removal efficiency. S2O82- at the end of 20 min of reaction, removed 17% of dye, at the same condition, electrochemical process with iron electrode had only 31% efficiency, but, the combination of these two processes could remove 99.8% of dye.
Conclusion: The use of S2O82- anions in an electrochemical reactor with iron electrodes can be increase the efficiency of process. Therefore, using this process can be promising process to industrial wastewater treatment.