EDTA and electricity synergetic catalyzed Fe(3+)/H2O2 process for amoxicillin oxidation

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies
• Oxidation Processes

Background:

• Amoxicillin is a widely used antibiotic, and its presence in wastewater poses environmental risks.
• Conventional wastewater treatment methods are often insufficient for removing pharmaceutical residues like amoxicillin.
• Pretreatment is crucial for enhancing the efficacy of subsequent biological treatment processes.

Purpose of the Study:

• To evaluate and compare three oxidation processes for amoxicillin wastewater pretreatment.
• To assess the efficiency of chemical oxygen demand (COD(cr)) removal and amoxicillin degradation.
• To investigate the impact of these processes on the biodegradability of the treated effluent.

Main Methods:

• Comparison of Electro-Fe(3+)(EDTA)/H2O2, Fe(3+)(EDTA)/H2O2, and Electro-Fe(3+)/H2O2 oxidation processes at pH 7.0.
• Measurement of chemical oxygen demand (COD(cr)) removal and amoxicillin degradation percentages.
• Assessment of effluent biodegradability using the biological oxygen demand (BOD(5))/COD(cr) ratio.
• Analysis of characteristic changes in H2O2 and ethylenediaminetetraacetic acid (EDTA) using infrared spectra (IR).

Main Results:

• Electro-Fe(3+)(EDTA)/H2O2 achieved the highest COD(cr) removal (78%) and amoxicillin degradation (86%).
• The Electro-Fe(3+)(EDTA)/H2O2 process significantly improved effluent biodegradability to 0.48, compared to 0.40 for Fe(3+)(EDTA)/H2O2 and 0.12 for Electro-Fe(3+)/H2O2.
• Synergistic effects of EDTA and electricity were observed in enhancing the oxidation process.
• A potential amoxicillin degradation pathway was proposed based on IR spectral analysis.

Conclusions:

• The Electro-Fe(3+)(EDTA)/H2O2 process is a highly effective method for amoxicillin wastewater pretreatment.
• This advanced oxidation process enhances both pollutant removal and effluent biodegradability, making it suitable for antibiotic-containing wastewater.
• The study highlights the importance of combining electrochemical methods with chelating agents and oxidants for efficient pharmaceutical wastewater treatment.