Comparison of Antibiotic Resistance Removal Efficiencies Using Ozone Disinfection under Different pH and Suspended Solids and Humic Substance Concentrations
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- 作者：Gijung Pak ; Dennis Espineli Salcedo ; Hansaem Lee ; Junsik Oh ; Sung Kyu Maeng ; Kyung Guen Song ; Seok Won Hong ; Hyun-Chul Kim ; Kartik Chandran ; Sungpyo Kim
- 刊名：Environmental Science & Technology
- 出版年：2016
- 出版时间：July 19, 2016
- 年：2016
- 卷：50
- 期：14
- 页码：7590-7600
- 全文大小：654K
- 年卷期：0
- ISSN：1520-5851
文摘
This study mainly evaluated the effectiveness of ozonation toward the enhancement of the removal efficiencies of antibiotic-resistant bacteria (ARB), pB10 plasmid transfer, and pB10 plasmids under different pH and suspended solids (SS) and humic acid concentrations. First, chlorination was tested as a reference disinfection process. Chlorination at a very high dose concentration of Cl2 (75 mg L–1) and a long contact time (10 min) were required to achieve approximately 90% ARB and pB10 plasmid transfer removal efficiencies. However, even these stringent conditions only resulted in a 78.8% reduction of pB10 plasmid concentrations. In case of ozonation, the estimated CT (concentration × contact time) value (at C0 = 7 mg L–1) for achieving 4-log pB10 plasmid removal efficiency was 127.15 mg·min L–1, which was 1.04- and 1.25-fold higher than those required for ARB (122.73 mg·min L–1) and a model nonantibiotic resistant bacterial strain, E. coli K-12, (101.4 mg·min L–1), respectively. In preventing pB10 plasmid transfer, ozonation achieved better performance under conditions of higher concentrations of humic acid and lower pH. Our study results demonstrated that the applicability of CT concept in practice, conventionally used for disinfection, might not be appropriate for antibiotic resistance control in the wastewater treatment process. Further studies should be conducted in wastewater engineering on how to implement multiple barriers including disinfection to prevent ARB and ARG discharge into the environment.