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Degradation of Amoxicillin Wastewater by Fenton-like Processes

Author: TangYuFang
Tutor: LiXiaoMing
School: Hunan University
Course: Environmental Engineering
Keywords: Antibiotic Wastewater Amoxicillin Power -Fenton method Fe3 EDTA / H2O2 system Degradation of
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 258
Quote: 1
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Abstract


Antibiotics have long been widely used in human and animal diseases, and in sub-therapeutic doses of long-term added to animal feed for animal disease prevention and promote growth. However, antibiotic resistance caused by misuse of the consequences of public health has become a public health problem, and the abuse of antibiotics on the ecological environment pollution hazard is also very serious. Antibiotic production wastewater generally characterized by complex composition, toxic, difficult to biodegradation, and wastewater microbial growth and metabolic processes are inhibited. In this paper, amoxicillin as the research object, choose one of two categories Fenton method (electric-Fenton method and Fe3 (EDTA) / H202 system) as a pretreatment methods to improve amoxicillin simulated wastewater COD removal and biodegradability, broadening reaction pH range required to explore amoxicillin degradation rule for antibiotic wastewater treatment and provide basic data and theoretical guidance. Used in the experiment of electric-Fenton method using electrolysis assisted Fenton method, electrolysis and Fenton technology will organically together. Electrolysis can Fenton reaction Fe3 continuously and effectively restore regeneration Fe2, Fe2 provide more catalytic H202, thus electrically-Fenton method for the COD removal efficiency was significantly greater than Fenton method. The initial concentration of amoxicillin of 0.1 g / L, the analysis of various factors influence the COD removal, The optimum operating conditions: [H202] = 13mmol / L, [Fe2]: [H202] = 1:36, current I = 0.3A, pH = 4.5, reaction 100min after, COD removal rate of 70%, BOD5/COD from 0 to 0.41. Fe2 and H202 optimum molar ratio (1:36) is also suitable for the treatment of high concentrations of amoxicillin water. Liquid chromatography - mass spectrometry for detection of degradation products, indicating that the reaction is degraded 后阿莫西林 basic, β-lactam ring is damaged, R side strand, generate a product. Raised the possibility of amoxicillin degradation pathway. Using Fe3 (EDTA) / H202 system under neutral conditions amoxicillin wastewater treatment, and its degradation characteristics were studied. System of EDTA Fe3 role is to improve the solubility, reactivity and catalytic efficiency, thereby increasing the COD removal efficiency and broaden the range of pH response required. By condition of each single factor experiment explored the impact on the degradation process, the results showed that: The optimum reaction pH of 7, [Fe3] [EDTA] molar ratio of 2:1 ([Fe3] = 0.80mmol / L), [H202 ] = 65mmol / L, reaction temperature T = 20 ℃, reaction 300min after, COD removal rate of 62.5%. The reaction, EDTA is both a catalyst reaction, which is after the catalytic degradation of small molecule products, EDTA to avoid the possibility of secondary environmental pollution caused help Fenton reagent in neutral or alkaline conditions Degradation penicillin antibiotic wastewater. By infrared spectroscopy, the reaction characteristics of the molecular structure 后阿莫西林 functional group β-lactam ring is damaged, generated containing aliphatic compounds, including the product.

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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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