Amoxicillin degradation at ppb levels by Fenton's oxidation using design of experiments.
ABSTRACT A central composite factorial design methodology was employed to optimise the amoxicillin degradation using the Fenton's oxidation treatment. In this study, the variables considered for the process optimisation were the hydrogen peroxide and ferrous ion initial concentrations and the temperature, for an antibiotic concentration of 450μg L(-1) at pH=3.5. This methodology also allowed assessing and identifying the effects of the different factors studied and their interactions in the process response. An appropriate quadratic model was developed in order to plot the response surface and contour curves, which was used to perform the process optimisation. From this study, it was concluded that ferrous ion concentration and temperature were the variables that most influenced the response. Under the optimal conditions (hydrogen peroxide concentration=3.50-4.28mg L(-1), ferrous ion concentration=254-350μg L(-1) and temperature=20-30°C), it was possible to achieve total amoxicillin degradation after 30min of reaction.
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ABSTRACT: Abstract Background: Nowadays, international concern about the impact of antibiotic residues on the environment increased and their removal has received a lot of consideration. The aim of this study was to investigate the efficiency of Fenton’s advanced oxidation process (H2O2/Fe+2) in sulfadiazine antibiotic removal from aqueous solutions. Materials and Methods: An experimental-laboratory scale study was done on a synthetic wastewater containing sulfadiazine antibiotic with 0.079, 0.19, and 0.47 mM concentrations under Fenton’s process. Then optimal values of affecting parameters, such as initial antibiotic concentration, molar ratio of reagents, [Fe+2] and [H2O2] concentration, detention time, and pH, were determined. The discharged effluent analyzed by HPLC-UV to identify the antibiotic residues. Results: The results showed that the optimal parameters in the Fenton’s oxidation process to remove the sulfadiazine included antibiotics at pH 3.5, molar ratio of [H2O2] / [Fe +2] equal to 1.5, and contact time of 15 minutes, respectively. In these optimal conditions, the efficiency of removal of antibiotic in concentrations of 0.079, 0.19, and 0.47 mM were 99.82%, 97.97% and 78.23% and the wastewater COD removal degrees were 83.33%, 78.57%, and 78.57%, respectively. Conclusion: The experiments showed the efficient removal of sulfadiazine antibiotic in wastewater by Fenton’s oxidation process. The efficiency of this method can also be considered in eliminating other antibiotics resistant to biological treatment.Arak Medical University Journal (AMUJ). 01/2012; 15(66):19-29.
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ABSTRACT: This study presents the degradation and mineralization results of phenol-containing fire fighting wastewater (FWW) generated from quenching a fire outbreak in an oil storage facility. The chemical oxygen demand (COD) and phenol content of the wastewater were above the Malaysian Standard B discharge limits of 100 and 1 mg L−1 for COD and phenol, respectively. The Fenton oxidation method was chosen as the treatment technique, and a response surface methodology was used to optimize the response of the dependent variables: namely, COD, phenol, and total organic carbon (TOC) percentage removals. Based on the wastewater COD, three controlling variables, namely, tr and the mass ratios of [H2O2]:[FWW] and [H2O2]:[Fe2+], were studied at values of 0.5 to 8, 2 to 12, and 5 to 20 h, respectively. The results obtained for the treated samples showed complete phenol degradation. However, the optimum percentage of TOC and COD reduction were 53.4 and 77.5%, respectively. The low TOC removal was attributed to partial hydroxylation, which generated more aliphatic components that then retarded the mineralization of the organic load. Kinetic studies using the Generalized Lumped Kinetic Model showed that the apparent kinetic constants, for the initial oxidation step (k′1) and for the final oxidation step (k′2), are 11.2×10−3 h−1 and 6.4×10−3 h−1, respectively. These results indicate that the reaction rate leading to the hydroxylation of the organic load is approximately twice as fast as the rate of intermediate product conversion to the final product. The fast initial rate (k′1) accounted for the complete phenol degradation, and the relatively slow second rate (k′2) resulted in incomplete mineralization of some of the intermediate organic by-products.Journal of Environmental Engineering 01/2012; 138(7):761-770. · 1.40 Impact Factor
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ABSTRACT: Organic compound, especially aromatic compound is the main pollutant in industrial effluent. Conventional wastewater treatment processes are inefficient for the removal of these types of toxic and hazardous pollutants from wastewater. Electro Fenton is one of the powerful and environmentally friendly emerging technologies for the remediation of wastewaters containing organic, especially aromatic compounds. This paper reviews the fundamentals and recent developments in electro Fenton process. Electro Fenton process utilizes different electrolytic reactors such as bubble reactor, filter press reactor, divided double-electrode electrochemical cell, divided three-electrode electrochemical cell and double compartment cell. Different cathodes as working electrode and anodes as counter electrode used in this process are analyzed. The effects of various operating parameters and their optimum ranges for maximum pollutant removal and mineralization are reviewed. Also various pollutants removed by this process are evaluated. Quick removal and mineralization of pollutants and their intermediate reaction products were reported.Desalination 06/2012; · 3.04 Impact Factor