Ali Reza Rahmani; Amir Shabanlo; Somaye Akbari; Hadi Rezaeivahidian; Monire Tarlani; Zahra Daraee; Halime Almasi
Volume 25, Issue 1 , May and June 2018, , Pages 21-29
Abstract
Abstract Backgrond: Pharmaceutical products, particularly antibiotics such pollutants are evolving due to the cumulative effects, adverse effects and drug resistance is a major concern in the control environment. The purpose of this work is to investigate the feasibility and potential of iron ...
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Abstract Backgrond: Pharmaceutical products, particularly antibiotics such pollutants are evolving due to the cumulative effects, adverse effects and drug resistance is a major concern in the control environment. The purpose of this work is to investigate the feasibility and potential of iron nanoparticles in the aqueous solution being removed antibiotics. Materials and Methods: In this study, the performance activated persulfate with zero-valent Zinc nanoparticles in the presence of ultrasound in the analysis of antibiotics was investigated. The effect of process parameters such as pH of the solution (2.97-10.53), concentration Potassium persulfate (194.33-1200mg/l) and the zero-valent zinc (12.73-147.27mg/l) in reaction time 0-180 min using a batch chamber ultrasonic were studied. A statistical procedure was used to optimize the parameters of the RSM model. Antibiotics are measured based on COD vials and DR-5000 spectrophotometer was used. Results: The results showed that the initial pH of the solution is the most important influential parameters. The addition of potassium persulfate and zero valent zinc in the samples was enhanced performance. Optimum efficiency achieved in 50 mg/l concentration antibiotics, potassium persulfate 1200 mg/l, the zero- zinc 120 mg /l, pH 4.5. Conclusion: The results of this study demonstrate acceptable performance persulfate activated process with zero-valent iron and zinc nanoparticles on ultrasound in the presence of antibiotic.
Amir Shabanlo; mina Khorshidi; Abdolmotaleb Seid Mohammadi
Volume 24, Issue 6 , March and April 2018, , Pages 81-93
Abstract
Background & Objectives: The Azo dyes due to presence of aromatic rings in structure are considered major problems into the environment. In this experimental study, the synergistic effect of persulfate and nano zero-valent iron in degradation of Acid Blue 113 in presence of ultrasonic irradiation ...
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Background & Objectives: The Azo dyes due to presence of aromatic rings in structure are considered major problems into the environment. In this experimental study, the synergistic effect of persulfate and nano zero-valent iron in degradation of Acid Blue 113 in presence of ultrasonic irradiation was investigated.
Materials and Methods: The effect of operating parameter such as initial pH, different concentration of S2O82-, nZVI and initial dye using a batch ultrasound reactor at 40 kHz frequency was investigated. After the optimize process, synergistic dye degradation and COD reduction of colored solution was studied. For characterization of the prepared nZVI particle, transmission electron microscope (TEM) image was used.
Results: To remove 99% dye with initial concentration of 50 mg/L, the optimal condition in the end of 30 min of reaction was pH 3, concentration of S2O82- and nZVI 5 mM and 50 mg/L, respectively. In the same of condition with increasing pH to 11 the dye removal efficiency decreased to 17%, respectively. After 120 min of reaction in the optimal condition, the COD reduction was 95%. Synergistic dye degradation in US/S2O82-/Fe0 process was observed 59%. The TEM image of the synthesized nZVI confirmed the nanoscale Creation.
Conclusion: The US/S2O82-/Fe0 combined process due to high synergistic degradation, can be promising process to industrial wastewater treatment.
Mohammadreza Samarghandi; Amir Shabanlou; Saba Majidi; Yosef PourEshgh; Jamal MehrAlipour
Volume 22, Issue 4 , September and October 2015, , Pages 639-648
Abstract
Background & Objectives: Electro-Ozonation process (EOP) has a good potential for the removal of persistent organic pollutants. This process is a combination of ozonation process and electricity for producing hydroxyl radical and removal of pollutants. The purpose of this study was to evaluate the ...
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Background & Objectives: Electro-Ozonation process (EOP) has a good potential for the removal of persistent organic pollutants. This process is a combination of ozonation process and electricity for producing hydroxyl radical and removal of pollutants. The purpose of this study was to evaluate the EOP for SDBS degradation in aqueous media. Materials & Methods: In this experimental study, a semi-batch reactor with four graphite electrodes of 120 cm2 area was used. The effects of pH (3-11), the inlet of ozone (6-30 mM / s), current density (16-85 mA/cm2), the initial concentration of SDBS (0.02-0.3 mM/L) and radical scavenger dose (0.2 mM/L) were studied.SDBS concentration measured by spectrophotometer (DR5000) by instructions provided in the standard method book. Results: The results indicate the high efficiency of this process in the removal of SBDS and COD. In optimum conditions of pH = 3, current 85 mA/cm2, ozone flow rate 30 mM/s and initial SDBS concentration 0.02 mM/L, more than 99% removal was observed in 50 min. By changing the parameters of the optimum conditions, the process performance was decreased. High efficiency of COD removal in this process was obtained in 80 min. Influence of TBA in solution was the efficiency decrease of process to 80 %. Conclusion: Electro-ozonation process as an advanced oxidation process can reduce organic pollution industry and can be considered as an environmentally friendly process.
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.
Jamal Mehralipor; Yosef Poreshgh; Amir Shabanloo; Mohammadreza Samarghandi; Roghiyeh Safari; Parisa Solgi
Volume 21, Issue 2 , May and June 2014, , Pages 252-262
Abstract
Background and objectives: Cyanide ion is one of the most dangerous compounds for the man. Electrocoagulation process with high efficiency to removing pollutants, than researchers considered a effective process. The aim of this study was to determine the efficiency of electrocoagulation process by aluminum ...
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Background and objectives: Cyanide ion is one of the most dangerous compounds for the man. Electrocoagulation process with high efficiency to removing pollutants, than researchers considered a effective process. The aim of this study was to determine the efficiency of electrocoagulation process by aluminum electrodes in cyanide removal from synthetic wastewater using magnesium oxide as a coagulantaid.
Mehods: In this study, a reactor with four aluminum electrodes with dimensions 200 × 20 × 2 mm use of 1 Liter of useful volume of electricity generating device for the removal of cyanide was used. Effect of parameters such as pH(3-9), voltage (10-30 V), the initial concentration of cyanide(50-500 ppm) and different concentrations of magnesium oxide particles (0.1 to 1 mg l) as coagulant aid in the process were investigated.
Results: The results show that the efficiency of EC process at pH 5, voltage of 30 V and an initial concentration of cyanide, 50 mg/lit in 45 minutes, was 80 percent. process will Efficiency by adding coagulant aid. In optimal amounts of coagulant aid (0.1 mg/lit) in electrocoagulation process on the removal of the cyanide 90% was achieved.
Conclusion: Electrocoagulation process is suitable process for the removal of cyanide. Also, Magnesium Oxide as a coagulant aid in this process was good and increase process efficiency.