COD Reduction in Petrochemical Wastewater Using the Solar Photo-Fenton Process (original) (raw)
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The objective of this study was to investigate the performance of employing solar photo-Fenton to treat petroleum wastewater from Sohar oil refinery, evaluate this process by a central composite design with response surface methodology and evaluate the relationship among operating variables such as pH, H 2 O 2 dosage, Fe ?2 dosage, and reaction time to identify the optimum operating conditions. Quadratic models proved to be significant with very low probabilities (\0.0001) for the following responses: total organic carbon (TOC) and chemical oxygen demand (COD). The optimum conditions were H 2 O 2 dosage (850 mg L-1), Fe ?2 dosage (60 mg L-1), pH (3.68) and reaction time (127 min) in this method. The experimental results of the maximum TOC and COD removal rates corresponded good with the predictions, which were 59.3 and 74.7 %, respectively. This method achieved well degradation efficiencies for TOC and COD and reduced the treatment time comparing with the previous work. Keywords Photo-Fenton Á Petroleum wastewater Á Chemical oxygen demand (COD) Á Total organic carbon (TOC)
Advances in Environmental Chemistry, 2014
Establishing a treatment process for practical and economic disposal of car wash wastewater has become an urgent environmental concern. Photo-Fenton’s process as one of the advanced oxidation processes is a potentially useful oxidation process in treating such wastewater. Lab-scale experiments with UV source, coupled with Fenton’s reagent, showed that hydrocarbon oil is degradable through such a process. The feasibility of photo-Fenton’s process to treat wastewater from a car wash is investigated in the present study. A factorial design based on the response surface methodology was applied to optimize the photo-Fenton oxidation process conditions using chemical oxygen demand (COD) reduction as the target parameter to optimize. The reagent (Fe2+and H2O2concentration) and pH are used as the controlling factors to be optimized. Maximal COD reduction (91.7%) was achieved when wastewater samples were treated at pH 3.5 in the presence of hydrogen peroxide and iron in amounts of 403.9 and ...
Degradation of organic effluents containing wastewater by photo-Fenton oxidation process
RESEARCH STATEMENT TOPIC OF Ph.D THESIS : “USE OF PHOTOFENTONS REAGENT AS AN OXIDANT” YEAR OF SUBMITION : 2004 YEAR OF AWARD : 2006 PAPER PUBLICATION:02 (ONE NATIONAL AND ONE INTERNATIONAL LEVELIJC-A Vol.47A(11) [November 2008] Photooxidation of some organic pollutants (p-nitroaniline, p-aminophenols and acetanilide) has been carried out in the presence of photo-Fenton reagent. The effect of various parameters like pH, concentrations of organic compounds, ferric ions and hydrogen peroxide and light intensity, etc. on the reaction rate has been studied. The degradation is found to be pseudo first order. The optimum pHs for the degradation of p-aminophenol, p-nitroaniline and acetanilide are found to be 3.0, 3.5 and 2.5, respectively while the rate degradations of the three compounds are found to be comparable. The study shows that the photo-Fenton process are more effective and faster than Fenton's reagent in oxidation of organic compounds, and that the organic compounds are completely oxidized and degraded into CO2 and H2O. A tentative mechanism has been proposed. Excellent removal has been obtained using photo-Fenton process assisted with artificial irradiation. This study demonstrates that the use of photo-Fenton process on organic effluents wastewater treatment is very promising, especially when solar light is used.
COD reduction of petrochemical industry wastewater using Fenton's oxidation
The Canadian Journal of Chemical Engineering, 2010
Reduction of chemical oxygen demand (COD) value of petrochemical industry wastewater (COD ∼11 500 mg/L) by Fenton's oxidation has been investigated. Batch tests were conducted on the effluent samples to determine the optimum process conditions. Fenton's oxidation process was found to effectively reduce the COD by 97.5% in 100 min. Effects of different process parameters: pH, H2O2 dosage, Fe2+ dosage, H2O2/Fe2+ ratio, temperature were investigated. The optimum conditions were at pH 3, H2O2 concentration 3 M, Fe2+ concentration 0.06 M and temperature 30°C. Optimum molar ratio [H2O2/Fe2+] was 50:1. At optimum conditions, 97.5% COD reduction was achieved for the typical effluent sample from nearby industry manufacturing mainly PET resins.On a analysé la réduction de la valeur demande chimique en oxygène (DCO) des eaux usées de l'industrie pétrochimique (DCO ∼11 500 mg/L) par oxydation de Fenton. Des essais par lots ont été réalisés sur les échantillons d'effluent dans le...
Clean-soil Air Water, 2009
In the present study, the effects of initial COD (chemical oxygen demand), initial pH, Fe 2+ /H 2 O 2 molar ratio and UV contact time on COD removal from medium density fiberboard (MDF) wastewater using photo-assisted Fenton oxidation treatment were investigated. In order to optimize the removal efficiency, batch operations were carried out. The influence of the aforementioned parameters on COD removal efficiency was studied using response surface methodology (RSM). The optimal conditions for maximum COD removal efficiency from MDF wastewater under experimental conditions were obtained at initial COD of 4000 mg/L, Fe 2+ /H 2 O 2 molar ratio of 0.11, initial solution pH of 6.5 and UV contact time of 70 min. The obtained results for maximum COD removal efficiency of 96% revealed that photo-assisted Fenton oxidation is very effective for treating MDF wastewater.
The objective of this study is to investigate the performance of employing Fenton’s reagent in the solar photo-catalyst of TiO2 to treat petroleum wastewater from Sohar oil Refinery, Oman. A central composite design (CCD) with response surface methodology (RSM) is applied to evaluate the relationships between operating variables, such as TiO2 and Fenton dosage, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following three responses prove to be significant with very low probabilities (<0.0001): chemical oxygen demand (COD), total organic carbon (TOC) and residual iron (Fe). The obtained optimum conditions include a reaction time of 90 min, 0.66 g/L TiO2, 0.5 g/ L H2O2, 0.01 g/L Fe2+, and pH 4.18. TOC and COD removal rates are 62% and 50%, respectively, and 0.8 ppm residual iron is obtained. The predictions correspond well with experimental results (TOC and COD removal rates of 64%, and 48%, respectively, and 0.5 ppm residual iron). The solar photo-Fenton process has well efficient for petroleum wastewater treatment in acidic conditions pH < 7 and more economic by free energy.
Removal of organic pollutants from produced water using Fenton oxidation
E3S Web of Conferences
Produced water (PW) is the largest stream of wastewater from oil and gas exploration. It is highly polluted and requires proper treatment before disposal. The main objective of this study was to investigate the effectiveness of Fenton oxidation in degradation of organic matter in PW. The role of operating factors viz., H2O2 concentration (0.12 × 10-3 moles/L to 3 moles/L), [H2O2]/[Fe2+] molar ratio (2 to 75), and reaction time (30 to 200 minutes), on COD removal was determined through a series of batch experiments conducted in acidic environment at room temperature. The experiments were conducted with 500 mL PW samples in 1L glass beakers covered on the outside with aluminum foil to protect them from sunlight. Pre-decided amounts of ferrous sulfate heptahydrate (FeSO4.7H2O) and hydrogen peroxide (H2O2) were added to initiate the Fenton reaction. An increase in COD removal was observed with increase in reaction time and [H2O2]/[Fe2+] molar ratio. COD removal also increased with H2O2 ...
The aim of this work was to study the possibility of treating an industrial semiconductor wastewater by combining physical and chemical methods. The combined treatment consisted of pH adjustment to 2 followed by filtration and then chemical oxidation with Fenton reagent over the resulting filtered wastewater. In chemical oxidation treatment, the isolated effect of the variables on the degradation of the organic compounds-measured by chemical oxygen demand (COD) removal-was first studied: pH (3 to 5), reaction time (0.25 to 5 hours), hydrogen peroxide concentration (2.1 to 5.9 M) and FeSO 4 : H 2 O 2 mass ratio (1:5 to 3:2). Higher COD removal (75%) was obtained when a pH value of 3, reaction time of 4 hours, hydrogen peroxide concentration of 4.2 M and FeSO 4 : H 2 O 2 mass ratio of 1:5 were used. The global efficiency of COD removal by combination of the two treatments was 80%. The influence of three variables and their interactions was evaluated, using an experimental design of the type 2 3. The design also allowed the conclusion that reaction time has a statistical meaning.
Applied Catalysis B: Environmental, 2010
H-acid is a biologically inert, photochemically stable napthalene sulphonate derivative (1-amino-8hydroxynaphthalene-3,6-disulphonic acid) being frequently produced as an essential raw material of many commercially available textile azo dyes. Treatability reports dealing with the advanced chemical oxidation of H-acid are limited to a few case studies that do not provide a deep insight into single as well as combinative effects of the main process variables influencing the treatment performance. In the present study, the degradation of aqueous H-acid and its organic carbon (COD, TOC) content with the Photo-Fenton-like advanced oxidation process was optimized in terms of selected major process variables (ferric iron concentration, hydrogen peroxide concentration, initial COD value and reaction time) by employing response surface methodology and central composite design. For this purpose, two main targets were set in the optimization approach, namely (i) the achievement of complete/highest possible oxidation (mineralization) and a (ii) partial oxidation option under relatively mild reaction conditions. The photocatalytic treatment performance was examined by the analysis of the process outputs H-acid, COD and TOC removals. Statistical evaluation of the established polynomial regression models as well as validation experiments run under locally (initial COD-based) optimized reaction conditions to test the reliability of the obtained models revealed that Photo-Fenton-like oxidation of aqueous H-acid is highly efficient and the proposed reaction model successfully predicts organic carbon abatement rates for both treatment targets. From the empirical regression models derived for organic carbon removal it was also evident that the photocatalytic treatment system was mainly affected by the initial COD content (negative effect) closely followed by the parameter initial hydrogen peroxide concentration (positive effect). Activated sludge inhibition experiments conducted with heterotrophic biomass indicated that during the application of Photo-Fenton treatment under optimized reaction conditions, no toxic oxidation products were formed.
A Review on Wastewater Treatment Containing Organic Pollutants Using Advance Oxidation Processes
International Journal of Scientific Research in Science and Technology, 2023
Advanced oxidation processes (AOPs) are the technologies that generally use the hydroxyl radicals, the ultimate oxidant for the remediation of organic contaminants in wastewater. These are highly effective novel methods speeding up the oxidation process. AOPs can combine with Fenton (H2O2/Fe2+), photo-Fenton (H2O2/UV/Fe2+), and electro-Fenton, heterogeneous photooxidation using titanium dioxide (TiO2/hv), singlet molecular oxygen process, singlet oxygen-photo-Fenton process, sonolysis, peroxidation combined with ultraviolet light (H2O2/UV), UV alone, UV/O3, UV/S2O8-2, UV/Chlorine, peroxone (O3/H2O2), peroxone combined with ultraviolet light (O3/H2O2/UV), O3/UV system, O3/TiO2/ H2O2 and O3/TiO2/Electron beam irradiation. Ozone (O3), catalyst or ultraviolet (UV) irradiation to offer a powerful treatment processes of wastewater. Future research should be focused on enhancing the properties of heterogeneous catalysts in AOPs. This review report of different AOPs utilized for the removal of various phenolic compounds and textile dyes in wastewater.