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Erythromycin Degradation by a Heterogeneous Fenton-Like System on Synthesis Iron Oxide Coated Sand

Author: ChenZuo
Tutor: WangShuangFei
School: Guangxi University
Course: Chemical processes
Keywords: SCS heterogeneous Fenton Erythromycin wastewater degradation kinetic and mechanism
CLC: X703
Type: PhD thesis
Year: 2012
Downloads: 103
Quote: 0
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Abstract


Erythromycin was a typical macrolide antibacterial drug. Its production will produce large amount of wastewater, which was higher concentration of organic compounds, complex composition, taste and weak biodegradability. Advanced oxidation process (AOP) refers to a set of chemical oxidation procedures designed for non-biodegradable toxic organic substances treatment. Fenton technology has been extensively studied as one of the destruction of various recalcitrant organic pollutants in water. Heterogeneous Fenton-like systems using iron supported catalysts have been developed. Based on the heterogeneous class of Fenton catalyst for up-flow heterogeneous oxidation tower of treatment of Erythromycin Wastewater, the load type Fenton catalyst, heterogeneous Fenton technology in the macrolide antibiotic wastewater treatment and its mechanism, for our country supported Fenton catalysts and heterogeneous Fenton technology development to provide a technical and theoretical basis.A new synthesis iron oxide coated sand catalyst was synthesized by oil bath evaporation method. The physicochemical characteristics of the SCS were evaluated by various techniques such as SEM/EDAX, XRD, FTER and surface analyzer. Particle size is about100nm; specific surface area is3.1347m2/g; surface iron oxide crystalline is hematite. The investigation an attempt was made to degrade Erythromycin in the effluent by homogeneous and heterogeneous Fenton-like oxidation process. The effect of pH, temperature, Fe2+dosage and H2O2dosage were investigated in terms of the COD conversion. At pH3.0,25±1℃,9.8mmol/L of H2O2dosage, and3.6mmol/L of FeSO4dosage, a70.8%COD reduction has been achieved in Fenton system. However, it requires a strong acid condition and large amounts of iron oxide sludge was yield. SCS Fenton-like system has a wider pH range. At pH5.0, a70%COD reduction has been zchieved. SCS exhibited a higher activity and stability. SCS was coupled with heterogeneous Fenton-like system to resolve the continuously reuse problem.The up-flow heterogeneous oxidation reactor was researched and developed, and the fluid configuration was simulated with the mechanical model of multi-phase fluid in the outer circulation fluidized-bed heterogeneous Fenton-like reactor. The result of numerical simulation proves that the solid phase catalyst can be so well fluidized in the up-flow heterogeneous oxidation reactor that the solid rate of all the fluid fields is approximately equal and there is little dead area to retain the solid phase catalyst.The degradation of Erythromycin in aqueous solution was confirmed using UV, FT-IR, HDLC, LC-MS and NMR spectroscopy. The kinetic constants for the oxidation of Erythromycin in effluent were determined. The effectiveness of heterocatalytic oxidation was over homogeneous Fenton oxidation process.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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