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+.

Treatment of tetrahydrofuran wastewater by the Fenton process: response surface methodology as an optimization tool

2014 ◽  
Vol 69 (5) ◽  
pp. 1080-1087 ◽  
Author(s):  
Xianzhong Cao ◽  
Huiqing Lou ◽  
Wei Wei ◽  
Lijuan Zhu
Keyword(s):  
Reaction Time ◽  
Response Surface ◽  
Removal Efficiency ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Degradation Pathway ◽  
Fenton Process ◽  
Operating Variables ◽  
Rsm Optimization ◽  
Initial Ph

In this study, the Box-Benkhen design and response surface method (RSM) were applied to evaluate and optimize the operating variables during the treatment of tetrahydrofuran (THF) wastewater by Fenton process. The four factors investigated were initial pH, Fe2+ dosage, H2O2 dosage and reaction time. Statistical analysis showed the linear coefficients of the four factors and the interactive coefficients such as initial pH/Fe2+ dosage, initial pH/H2O2 dosage and Fe2+ dosage/H2O2 dosage all significantly affected the removal efficiency. The RSM optimization results demonstrated that the chemical oxygen demand (COD) removal efficiency could reach up to 47.8% when initial pH was 4.49, Fe2+ dosage was 2.52 mM, H2O2 dosage was 20 mM and reaction time was 110.3 min. Simultaneously, the biodegradability increased obviously after the treatment. The main intermediates of 2-hydroxytetrahydrofuran, γ-butyrolactone and 4-hydroxybutanoate were separated and identified and then a simple degradation pathway of THF was proposed. This work indicated that the Fenton process was an efficient and feasible pre-treatment method for THF wastewater.

scholarly journals Photo-fenton remediation of wastewaters containing agrochemicals

2005 ◽  
Vol 48 (spe) ◽  
pp. 207-218 ◽  
Author(s):  
Antonio Carlos Silva Costa Teixeira ◽  
Lucas Mendes ◽  
Giselle Stollar ◽  
Roberto Guardani ◽  
Cláudio Augusto Oller do Nascimento
Keyword(s):  
Advanced Oxidation Processes ◽  
Low Cost ◽  
Oxygen Demand ◽  
Solar Irradiation ◽  
Treated Wastewater ◽  
Commercial Application ◽  
Photochemical Degradation ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Oxidation Processes

The photochemical degradation of agrochemicals in aqueous solution by means of advanced oxidation processes (AOPs) was studied. The photo-Fenton process was evaluated in terms of the time evolution of dissolved organic carbon (COD) and chemical oxygen demand (DOC), their total removals, and increase in biodegradability of treated wastewater. Under the experimental conditions studied, the process showed to be superior to other AOPs, at any Fe(II) and H2O2 concentrations. The results pointed towards the use of solar irradiation and low cost commercial application.

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.

Effect of Fe (II) concentration on metronidazole degradation by Fenton process: Performance and Kinetic study

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3265-3272
Author(s):  
Donovan R. Ramírez-Carranza ◽  
G. Macedo-Miranda ◽  
G. González-Blanco ◽  
S. Mireya-Martínez ◽  
Julio C. González-Juárez ◽  
...  
Keyword(s):  
Reaction Time ◽  
Kinetic Model ◽  
Molar Ratio ◽  
Process Performance ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Batch Studies ◽  
First Order ◽  
Antibiotic Drug ◽  
Optimal Ph

AbstractMetronidazole (MNZ) is an antibiotic drug to be carcinogenic and mutagenic. The present work was focused on MNZ degradation using the Fenton process, in batch studies. Five initial concentrations of MNZ (0.5, 5, 10, 15 and 20 mg/L), three Fe (II) concentrations (2.94, 5.88 and 11.66 μM), 29.4 μM H2O2, and three pH (3.5, 5 and 7) were evaluated at a reaction time of 5 min. A statistical factorial design using the program Minitab 18® was used to study the MNZ degradation. The best experimental conditions to degrade MNZ at 100% was 2.94 μM Fe2+ and pH of 3.5. Three kinetic models were used to study the degradation profile of MNZ at 2.94 μM Fe2+ and 29.4 μM H2O2, such as the first-order, the second-order, and BMG kinetic model. The BMG kinetic model was the best model to describe the MNZ degradation by Fenton process. On other hand, the optimal pH for MNZ degradation was 3.5, independently of the molar ratio Fe2+/H2O2 evaluated. At pH 5, degradation efficiencies decreased significantly, while at pH 7 the lowest degradation of MNZ was observed. Finally, the Fenton process showed the potential to degrade metronidazole.

scholarly journals Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 359
Author(s):  
Liping Zhang ◽  
Shengnian Wu ◽  
Nan Zhang ◽  
Ruihan Yao ◽  
Eryong Wu
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Mineral Processing ◽  
Ultraviolet Absorption Spectrum ◽  
Experimental Conditions ◽  
Removal Ratio

Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).

scholarly journals Municipal Leachate Treatment by Fenton Process: Effect of Some Variable and Kinetics

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mohammad Ahmadian ◽  
Sohyla Reshadat ◽  
Nader Yousefi ◽  
Seyed Hamed Mirhossieni ◽  
Mohammad Reza Zare ◽  
...  
Keyword(s):  
Reaction Time ◽  
Color Removal ◽  
Molar Ratio ◽  
Order Kinetic ◽  
Fenton Process ◽  
Solution Ph ◽  
Leachate Treatment ◽  
First Order ◽  
Order Kinetic Model ◽  
Better Than

Due to complex composition of leachate, the comprehensive leachate treatment methods have been not demonstrated. Moreover, the improper management of leachate can lead to many environmental problems. The aim of this study was application of Fenton process for decreasing the major pollutants of landfill leachate on Kermanshah city. The leachate was collected from Kermanshah landfill site and treated by Fenton process. The effect of various parameters including solution pH, Fe2+and H2O2dosage, Fe2+/H2O2molar ratio, and reaction time was investigated. The result showed that with increasing Fe2+and H2O2dosage, Fe2+/H2O2molar ratio, and reaction time, the COD, TOC, TSS, and color removal increased. The maximum COD, TOC, TSS, and color removal were obtained at low pH (pH: 3). The kinetic data were analyzed in term of zero-order, first-order, and second-order expressions. First-order kinetic model described the removal of COD, TOC, TSS, and color from leachate better than two other kinetic models. In spite of extremely difficulty of leachate treatment, the previous results seem rather encouraging on the application of Fenton’s oxidation.

Optimization and statistical analysis of sono-Fenton treated wastewater of food industry using reactor by response surface method

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vijay A. Juwar ◽  
Ajit P. Rathod
Keyword(s):  
Reaction Time ◽  
Response Surface ◽  
Food Industry ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Volume Ratio ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Experimental Result ◽  
Molar Ratio

Abstract The present study deals with the treatment of complex waste (WW) treated for removal of chemical oxygen demand (COD) of the food industry by a sono-Fenton process using a batch reactor. The response surface methodology (RSM) was employed to investigate the five independent variables, such as reaction time, the molar ratio of H2O2/Fe2+, volume ratio of H2O2/WW, pH of waste, and ultrasonic density on COD removal. The experimental data was optimized. The optimization yields the conditions: Reaction time of 24 min, HP:Fe molar ratio of 2.8, HP:WW volume ratio of 1.9 ml/L, pH of 3.6 and an ultrasonic density of 1.8 W/L. The predicted value of COD was 91% and the experimental result was 90%. The composite desirability value (D) of the predicted percent of COD removal at the optimized level of variables was close to one (D = 0.991).

scholarly journals Treatment of real paracetamol wastewater by fenton process

2017 ◽  
Vol 23 (2) ◽  
pp. 177-186 ◽  
Author(s):  
Gamze Dalgic ◽  
Ilter Turkdogan ◽  
Kaan Yetilmezsoy ◽  
Emel Kocak
Keyword(s):  
Pharmaceutical Industry ◽  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Biological Oxygen Demand ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Mass Distributions ◽  
Amino Phenol

The study investigated the pretreatment of real paracetamol (PCT) wastewater of a pharmaceutical industry by Fenton process. At the best experimental conditions (COD/H2O2 = 1/1, Fe+2/H2O2 = 1/70, settling method:centrifuging, pH 6 at settling step), 92.7, 92.7, 95.5, 99.1, 99.9 and 99.4% of chemical oxygen demand (COD), total organic carbon (TOC), 5-day biological oxygen demand (BOD5), PCT, para-amino phenol (PAP) and aniline were removed, respectively. Changes in the concentrations of these parameters were also investigated for both oxidation and settling steps of Fenton process. It was found that COD and TOC were removed at the settling step (precipitation) whereas PCT, PAP and aniline were removed at the oxidation step. Mass balance calculations were also studied to show the mass distributions of COD in different phases (gas + foam, effluent and sludge). Fenton process was found as an effective method for the pretreatment of real PCT wastewater for discharging in a determined collective treatment plant.

scholarly journals The Optimization of Ozonolysis Reaction For Synthesis of Biopolyol From Used Palm Cooking Oil

2014 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Edy Purwanto ◽  
Lieke Riadi ◽  
Nathania Tamara I. ◽  
Mellisha Ika K.
Keyword(s):  
Reaction Time ◽  
Response Surface ◽  
Ozone Concentration ◽  
Molar Ratio ◽  
Optimal Operating ◽  
Optimal Operating Condition ◽  
Hydroxyl Value ◽  
Independent Variables ◽  
Cooking Oil ◽  
Used Cooking Oil

Biopolyol is a raw material for synthesis of polyurethanes which is used as thermoset and thermoplastic materials, adhesives, rigid or non-rigid foams and also for coating. The utilization of waste edible oil as feedstock for synthesis of biopolyol has attracted some researchers. However, there is little attention focused on the application of ozone technology for synthesis of biopolyol from used cooking oil through ozonolysis reaction. Response surface methodology was performed to determine the optimal operating condition in the synthesis of biopolyol using ozone and sorbitol as a hydroxyl group source. The influence of input variables such as temperature, reaction time, molar ratio of oil to sorbitol and ozone concentration on hydroxyl value quantified was studied. The optimal condition was determined by high amount of hydroxyl value resulted from response surface method which used the experimental data. The ozonolysis reaction was conducted in a batch reactor equipped with agitator, tube sparger, thermocouple, reflux condenser and potassium iodide trap. Central composite design with four independent variables and one response variable was performed to determine the influence of independent variables on output variable of hydroxyl value of biopolyol. The hydroxyl value of polyol is a quadratic function of molar ratio of oil to methanol and a linear function of reaction temperature. The optimal operating condition was achieved at a temperature of 25℃, a reaction time of 5 hours, molar ratio of used cooking oil to sorbitol is 1:7 and ozone concentration about 4.8%.Keywords: Ozonolysis; Biopolyol; Hydroxyl value; Used cooking oil; Palm oil

Optimization of leachate treatment using persulfate/H2O2 based advanced oxidation process: case study: Deir El-Balah Landfill Site, Gaza Strip, Palestine

2015 ◽  
Vol 73 (1) ◽  
pp. 102-112 ◽  
Author(s):  
Ahmed H. Hilles ◽  
Salem S. Abu Amr ◽  
Rim A. Hussein ◽  
Anwar I. Arafa ◽  
Olfat D. El-Sebaie
Keyword(s):  
Reaction Time ◽  
Advanced Oxidation Process ◽  
Gaza Strip ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Leachate Treatment ◽  
Operating Variables ◽  
Treatment Processes ◽  
N Removal

The objective of this study was to investigate the performance of employing H2O2 reagent in persulfate activation to treat stabilized landfill leachate. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables, such as persulfate and H2O2 dosages, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following two responses proved to be significant with very low probabilities (<0.0001): chemical oxygen demand (COD) and NH3-N removal. The obtained optimum conditions included a reaction time of 116 min, 4.97 g S2O82−, 7.29 g H2O2 dosage and pH 11. The experimental results were corresponding well with predicted models (COD and NH3-N removal rates of 81% and 83%, respectively). The results obtained in the stabilized leachate treatment were compared with those from other treatment processes, such as persulfate only and H2O2 only, to evaluate its effectiveness. The combined method (i.e., /S2O82−/H2O2) achieved higher removal efficiencies for COD and NH3-N compared with other studied applications.

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