Innovative method for the fast removal of Escherichia coli from polluted water using electro-Fenton process: Modeling and investigation of the removal mechanism
Publish place: 20th International Congress of Microbiology of Iran
Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
MEDISM20_189
تاریخ نمایه سازی: 26 بهمن 1398
Abstract:
Introduction and Objectives: Escherichia coli (E. coli) bacteria are commonly used as indicator organisms to designate of impaired surface waters and to guide the design of management practices to prevent fecal contamination of water. Water purification from harmful bacteria using cheap and eco-friendly techniques is very important. Electrochemical advanced oxidation process (EAOPs) have attracted substantial attention owing to their environmental versatility, high efficiency, and safety. Among EAOPs, electro-Fenton (EF) process is one of the electrochemical processes that consist of producing Fenton’s reagent (Fe2+/H2O2) in acidic medium (pH 3). Therefore, the current study aimed to evaluate the efficiency of the EF process for removing E.coli from polluted water. Materials and Methods: The central composite design employed for efficient removal of E.coli as indicator organisms by response surface methodology using Design Expert 11®. The experiments were done under five levels of various operational parameters. The initial concentration of E.coli varied among 0.1 to 5×107 CFU mL-1, the current density ranging from 2 to 10 mA cm-2, H2O2 ranging from 100 to 1000 μL L-1, inter-electrode distance ranging from 1 to 5 cm, and reaction time ranging from 1 to 10 minute. Results: The maximum removal rate achieved at the initial E.coli concentration of 3.5×107 CFU mL-1, the current density of 4.5 mA cm-2, H2O2 dosage of 750 μL L-1, the inter-electrode distance of 3.5 cm, within the reaction time of 6 min. Regression analysis showed the good fit of the experimental data to the second-order polynomial model with a coefficient of determination (R2) value of 0.982, adjust correlation coefficient (Adj.R2) value of 0.9750 and predicted correlation coefficient (pred. R2) value of 0.956. Conclusion: Using ordinary radical scavengers demonstrated that hydroxyl radical (•OH) was the main oxidant species contributed to the removal of E.coli under the EF process.
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Authors
Saeid Babaei
Department of Microbiology, Kerman Branch, Islamic Azad University, Kerman, Iran.
Saeid Ahmadzadeh
Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran.
Maryam Dolatabadi
Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.