Study of solar photo-Fenton system applied to removal of phenol from water

2014 ◽  
Vol 70 (5) ◽  
pp. 780-786 ◽  
Author(s):  
Layla F. A. Freire ◽  
Fabiana Valéria da Fonseca ◽  
Lidia Yokoyama ◽  
Luiz Alberto Cesar Teixeira
Keyword(s):  
Advanced Oxidation Process ◽  
Phenol Degradation ◽  
Oxygen Demand ◽  
Phenol Concentration ◽  
Molar Ratio ◽  
Fenton Process ◽  
Mass Ratio ◽  
Fenton’S Reaction ◽  
Viable Method ◽  
Fenton System

This study evaluated the use of a Fenton's reaction in a falling film solar reactor (FFR), as a possible advanced oxidation process for the mineralization of the organic compound phenol in water. Preliminary tests were carried out to evaluate phenol degradation by photolysis and to select the optimal residence time in which to carry out the process using a solar photo-Fenton system. The variables studied were the initial phenol concentration (100 to 300 mg L−1), the [Phenol]:[H2O2] mass ratio (1.0 to 2.0) and the [H2O2]/[Fe2+] molar ratio (5 to 10). Phenol degradation of 99% and chemical oxygen demand (COD) reduction of 97% were obtained under the following reaction conditions: phenol concentration = 200 mg L−1, mass ratio [Phenol]:[H2O2] = 1.5 and molar ratio [H2O2]/[Fe2+] = 7.5. Overall mineralization was achieved using the solar photo-Fenton process to destroy phenol and COD. The solar photo-Fenton process using a FFR appears to be a viable method for removing phenols in wastewaters on an industrial scale.

scholarly journals ANAEROBIC BIODEGRADABILITY ENHANCEMENT OF MEAT PROCESSING WASTEWATER SLUDGE BY FENTON PROCESS

2019 ◽  
pp. 87-91
Author(s):  
Gulbin Erden ◽  
Ilknur Dambayci Hancioglu
Keyword(s):  
Anaerobic Digestion ◽  
Advanced Oxidation Process ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Gas Production ◽  
Wastewater Sludge ◽  
Process Conditions ◽  
Fenton Process ◽  
Meat Processing ◽  
Bmp Test

In this study, an advanced oxidation process of Fenton Process was applied to meat prosessing wastewater sludge for the purpose of sludge disintegration before anaerobic digestion. Fenton Process was applied to the meat processing wastewater sludge samples were taken from a treatment plant located in Denizli, Turkey. In the first stage of the study, experiments were carried out to optimize the process conditions in terms of disintegration using Box-Wilson Statistical Design. Ferrous iron and hydrogen peroxide concentrations were chosen as process variable and disintegration degree parameter based on soluble chemical oxygen demand calculations used as process response. 13% of disintegration degree was obtained at 90 gH2O2/ kg Dried Solids and 3 g Fe(III)/kg Dried Solids. After optimization studies for disintegration, sludge digestion studies were carried out using Biochemical Methane Potential (BMP) Test. BMP test results showed that Fenton Process can be used as a sludge disintegration purpose and application of Fenton Process before anaerobic digestion causes 33% higher methane gas production comparing the non-pretreated sludge.

Degradation of water polluted with used cooking oil by solar photolysis, Fenton and solar photo Fenton

2010 ◽  
Vol 62 (1) ◽  
pp. 77-84 ◽  
Author(s):  
J. Vergara-Sánchez ◽  
S. Silva-Martínez
Keyword(s):  
Reaction Time ◽  
Oxygen Demand ◽  
Solar Irradiation ◽  
Molar Ratio ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Operating Variables ◽  
Used Cooking Oil ◽  
Solar Photolysis ◽  
Oil Concentration

The degradation of used cooking safflower oil aqueous solutions by photolysis, Fenton, and photo Fenton under solar light is reported. The processes were carried out in a photochemical reactor with recirculation. Operating variables such as, pH, oil concentration and molar ratio of [H2O2]:[oil] were investigated to test their effects on the treatment efficiency of Fenton process. Also the iron catalyzed decomposition of hydrogen peroxide in the solar photo Fenton reaction was studied under different experimental conditions. The degree of oil oxidation was monitored by the measurements of chemical oxygen demand (COD) analyses. It was found that at pH 2.6 and a molar ratio of [H2O2]:[oil] of 489:1 were more efficient for COD abatement. The experimental results showed that the sole effect of the solar irradiation (photolysis) aided to decrease ∼65% of COD at neutral pH in a reaction time period of 15 h; whereas a decrease of 47% and ∼90% of COD was obtained by Fenton and photo Fenton treatment, respectively, after a reaction time of 50 min. It was observed a decrease in the decomposition of H2O2 in the solar photo Fenton process, in subsequent additions of H2O2, and H2O2 + Fe2+.

Photo-Fenton process of oxidative destruction of rice husk alkaline hydrolysates lignin

2019 ◽  
Vol 14 (2) ◽  
pp. 391-398 ◽  
Author(s):  
Olga D. Arefieva ◽  
Marina S. Vasilyeva ◽  
Ekaterina V. Ermolenko ◽  
Anastasiia V. Bychkova
Keyword(s):  
Rice Husk ◽  
Lignin Degradation ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Free Solution ◽  
Fenton Process ◽  
Constant Mass ◽  
Mass Ratio ◽  
Dilution Ratio ◽  
Alkaline Hydrolysate

Abstract The present work studies the destruction of a silica-free solution of alkaline hydrolysate of rice husk (pH 7.25, COD = 22.8O g·L−1) using the photo-Fenton process in the UV layer at a wavelength of 365 nm. Oxidation of lignin was carried out at a constant mass ratio of COD:H2O2 = 1:2 in the solutions with different dilution times (1:10, 1:50) and with varying iron(II) concentrations in the range from 10 to 100 mg·L−1. It was established that the oxidative degradation of alkaline lignin effectively proceeds in the UV layer when the solution is diluted 50 times, at an iron(II) concentration from 50 to 70 mg·L−1. Color, the content of polyphenols and chemical oxygen demand in the silica-free solution with a dilution ratio of 1:50, after oxidation, is reduced by several tens of times. The products of lignin degradation were identified using gas chromatography.

Simulation of landfill leachate treatment using electro-Fenton technique

2013 ◽  
Vol 69 (2) ◽  
pp. 343-349 ◽  
Author(s):  
Reza Davarnejad ◽  
Mostafa Keshavarz Moraveji ◽  
Masoud Pirhadi ◽  
Mohsen Mohammadi
Keyword(s):  
Experimental Data ◽  
Reaction Time ◽  
Current Density ◽  
Oxygen Demand ◽  
Simulated Data ◽  
Cod Removal ◽  
Molar Ratio ◽  
Fenton Process ◽  
Leachate Treatment ◽  
Computational Fluid Dynamics Cfd

The operating parameters in the electro-Fenton process were simulated using computational fluid dynamics (CFD). The effects of H2O2/Fe2+ molar ratio, current density, pH and reaction time were numerically investigated. The results were compared with the experimental data. The simulated data showed that maximum chemical oxygen demand (COD) removal was around 91.52% at pH of 3.27, H2O2/Fe2+ molar ratio of 1.16, current density of 59.29 mA/cm2 and reaction time of 41.7 min while the experimental data obtained from the literature showed a maximum COD removal (94.7%) at pH of 3, H2O2/Fe2+ molar ratio of 1, current density of 49 mA/cm2 and reaction time of 43 min.

Treatment of Pharmaceutical Wastewater by Micro-Electrolysis and Fenton Oxidation Process

2011 ◽  
Vol 356-360 ◽  
pp. 1622-1625 ◽  
Author(s):  
Chong Hao Huang ◽  
Meng Xing Cao ◽  
Jun Hong Luo ◽  
Chao Zhang
Keyword(s):  
Reaction Time ◽  
Oxidation Process ◽  
Ph Value ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Fenton Process ◽  
Mass Ratio ◽  
Pharmaceutical Wastewater ◽  
Initial Ph ◽  
Fenton Oxidation Process

Pharmaceutical wastewater was treated by micro-electrolysis and Fenton process.The aim of this research was to optimize operating parameters in micro-electrolysis and Fenton process. Effectiveness of important process parameters such as mass ratio of iron to carbon, the initial pH, reaction time and H2O2 dosage on the performance of micro-electrolysis and Fenton process were investigated. The results show that the removal efficiency of pharmaceutical wastewater chemical oxygen demand (COD) could reach 37.3% at the optimal pH of 4 with the iron to carbon ratio of 1:1 after 80 min treatment. The operating conditions of Fenton process are 0.5% of H2O2 dosage, the pH value of 4 and the reaction time of 180 min. The pharmaceutical wastewater COD removal could reach 79.4%.

Oxidation of Phenol by Persulfate Activated with UV-Light and Ag+

2012 ◽  
Vol 610-613 ◽  
pp. 1806-1809
Author(s):  
De Dong Sun ◽  
Huan Zheng ◽  
Wen Ping Xue
Keyword(s):  
Uv Irradiation ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Uv Light ◽  
Irradiation Time ◽  
Phenol Degradation ◽  
Oxygen Demand ◽  
Mercury Vapor ◽  
Cod Reduction

Phenol degradation with a UV/Ag+/K2S2O8 advanced oxidation process (AOP) was studied in a batch photolytic reactor. The UV irradiation source was a low-pressure mercury vapor lamp that was axially centered and was immersed in the phenol solution. In the UV/ K2S2O8 and Ag+/K2S2O8 system, the degradation of phenol was inefficient with an low concentration K2S2O8 at ambient temperature, and only around 26% and 23%of the phenol was degraded in 3 h , respectively. In the UV/Ag+/K2S2O8 oxidation process, persulfate (S2O82-) was activated by UV irradiation and Ag+ catalysis to produce powerful oxidants, SO4– •.The effects of K2S2O8 concentration, UV irradiation time and Ag+ concentration on the oxidation had been investigated. The experimental results indicated that optimum K2S2O8 concentration was 0.37mmol/L, and Ag+ concentration was 0.185 mmol/L. Phenol and chemical oxygen demand (COD) reduction was analyzed to determine the efficiency of the UV/Ag+/K2S2O8 process in mineralization, where we obtained 77% phenol reduction, and 65% COD reduction, respectively . The efficient mineralization of phenol is based on the in situ formation of the strong oxidant sulfate anion radical.

Winery wastewater treatment by a combined process: long term aerated storage and Fenton's reagent

2009 ◽  
Vol 60 (4) ◽  
pp. 1089-1095 ◽  
Author(s):  
Marco S. Lucas ◽  
Maria Mouta ◽  
António Pirra ◽  
José A. Peres
Keyword(s):  
Oxidation Process ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Molar Ratio ◽  
Fenton’S Reagent ◽  
Mass Ratio ◽  
Fenton's Reagent ◽  
Winery Wastewater

The degradation of the organic pollutants present in winery wastewater was carried out by the combination of two successive steps: an aerobic biological process followed by a chemical oxidation process using Fenton's reagent. The main goal of this study was to evaluate the temporal characteristics of solids and chemical oxygen demand (COD) present in winery wastewater in a long term aerated storage bioreactor. The performance of different air dosage daily supplied to the biologic reactor, in laboratory and pilot scale, were examined. The long term hydraulic retention time, 11 weeks, contributed remarkably to the reduction of COD (about 90%) and the combination with the Fenton's reagent led to a high overall COD reduction that reached 99.5% when the mass ratio (R = H2O2/COD) used was equal to 2.5, maintaining constant the molar ratio H2O2/Fe2 + =15.

PHENOL DEGRADATION IN WATER THROUGH A HETEROGENEOUS PHOTO-FENTON PROCESS

2007 ◽  
Vol 6 (6) ◽  
pp. 479-482
Author(s):  
Ilie Siminiceanu ◽  
Beatrice Iurascu ◽  
Miguel Vincente
Keyword(s):  
Phenol Degradation ◽  
Fenton Process

Accelerated Phenol Removal by Amplifying the Metabolic Pathway with a Recombinant Plasmid Encoding Catechol 2, 3 Oxygenase

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2191-2194 ◽  
Author(s):  
M. Fujita ◽  
M. Ike ◽  
T. Kamiya
Keyword(s):  
Metabolic Pathway ◽  
Recombinant Plasmid ◽  
Removal Rate ◽  
Phenol Degradation ◽  
Wild Strain ◽  
Phenol Concentration ◽  
Phenol Removal

The metabolic pathway of the phenol degradation in Pseudomonasputida BH was amplified by introducing the recombinant plasmid containing catechol 2,3 oxygenase gene isolated fron the chromosome of BH. This strain could degrade phenol and grow much faster than the wild strain at the phenol concentration of 100mg/L. This strain seems to accelerate the phenol removal rate if it is applied to the treatment of wastewater containing phenol.

scholarly journals Continuous Integrated Process of Biodiesel Production and Purification—The End of the Conventional Two-Stage Batch Process?

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 403
Author(s):  
Matea Bačić ◽  
Anabela Ljubić ◽  
Martin Gojun ◽  
Anita Šalić ◽  
Ana Jurinjak Tušek ◽  
...  
Keyword(s):  
Extraction Efficiency ◽  
Deep Eutectic Solvent ◽  
International Standards ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Process Conditions ◽  
Integrated Process ◽  
Free Glycerol ◽  
Mass Ratio ◽  
Glycerol Content

In this research, optimization of the integrated biodiesel production process composed of transesterification of edible sunflower oil, catalyzed by commercial lipase, with simultaneous extraction of glycerol from the reaction mixture was performed. Deep eutectic solvents (DESs) were used in this integrated process as the reaction and extraction media. For two systems, choline chloride:glycerol (ChCl:Gly) and choline chloride:ethylene glycol (ChCl:EG), respectively, the optimal water content, mass ratio of the phase containing the mixture of reactants (oil and methanol) with an enzyme and a DES phase (mass ratio of phases), and the molar ratio of deep eutectic solvent constituents were determined using response surface methodology (RSM). Experiments performed with ChCl:Gly resulted in a higher biodiesel yield and higher glycerol extraction efficiency, namely, a mass ratio of phases of 1:1, a mass fraction of water of 6.6%, and a molar ratio of the ChCl:Gly of 1:3.5 were determined to be the optimal process conditions. When the reaction was performed in a batch reactor under the optimal conditions, the process resulted in a 43.54 ± 0.2% yield and 99.54 ± 0.19% glycerol extraction efficiency (t = 2 h). Unfortunately, the free glycerol content was higher than the one defined by international standards (wG > 0.02%); therefore, the process was performed in a microsystem to enhance the mass transfer. Gaining the same yield and free glycerol content below the standards (wG = 0.0019 ± 0.003%), the microsystem proved to be a good direction for future process optimization.

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