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首页> 外文期刊>Journal of Environmental Science and Health >Effects of tetracycline on antibiotic resistance and removal of fecal indicator bacteria in aerated and unaerated leachfield mesocosms
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Effects of tetracycline on antibiotic resistance and removal of fecal indicator bacteria in aerated and unaerated leachfield mesocosms

机译：四环素对充气和非充气浸出液中膜的抗生素抗性和粪便指示细菌的去除

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摘要

Antibiotics can be present in low concentrations in domestic wastewater, but little is known about their effect on bacteria in onsite wastewater treatment systems. Mesocosms, consisting of soil-filled lysimeters representing the leachfield of a septic system under aerated (AIR) and unaerated (LEACH) conditions, were used to study the effects of tetracycline addition (5 mg L~(-1)) to septic tank effluent on tetracycline resistance in the fecal indicator bacteria Escherichia coli and fecal streptococci, and on their removal. The mesocosms were dosed with antibiotic for 10 days, and effects monitored for 52 days. The fraction of resistant bacteria in mesocosm drainage water relative to that in septic tank effluent, Г_(Res), for E. coli ranged from 0 to 0.66 in the AIR treatment and from 0 to 3.32 in the LEACH treatment. For fecal streptococci,Г_(Res) ranged from 0 to 0.41 and from 0.63 to 1.06 in the AIR and LEACH treatments, respectively. No significant differences in antibiotic resistance of fecal indicator bacteria were observed among sampling dates in soil or water from either treatment. Tetracycline had no significant effect on removal of fecal indicator bacteria, which ranged from 99.9 to 100% for E. coli and from 95.9 to 100% for fecal streptococci. Our results suggest that short-term addition of tetracycline at environmentally-relevant concentrations is likely to have minimal consequences on pathogen removal from wastewater and development of antibiotic resistance among pathogenic bacteria in leachfield soil.
机译：抗生素可以以低浓度存在于生活废水中，但人们对其在现场废水处理系统中对细菌的影响知之甚少。介孔膜由充满土壤的溶氧计组成，代表在曝气（AIR）和非曝气（LEACH）下化粪池系统的浸出场，用于研究添加四环素（5 mg L〜（-1））对化粪池废水的影响对粪便指示菌大肠埃希菌和粪便链球菌的四环素耐药性，以及它们的去除。给中膜给予抗生素10天，监测效果52天。相对于化粪池废水中的大肠杆菌，中膜排水中抵抗细菌的比例在AIR处理中为0到0.66，在LEACH处理中为0到3.32。对于粪链球菌，在AIR和LEACH处理中，Г_（Res）的范围分别为0至0.41和0.63至1.06。在两种处理的土壤或水中的采样日期之间，粪便指示剂细菌的抗生素耐药性均未观察到显着差异。四环素对粪便指示菌的去除没有显着影响，大肠杆菌的范围为99.9％至100％，粪便链球菌的范围为95.9％至100％。我们的研究结果表明，在环境相关浓度下短期添加四环素可能对浸出土壤中病原菌的去除和病原菌中抗生素耐药性的发展影响最小。

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