LUHan-qing,ZHANGZheng,ZHENGLin,et al.Isolation of Chlorine-resistant Escherichia coli and Bacterial Antibiotic Resistance Surveillance from Reclaimed Wastewater of Municipal Wastewater Treatment Plants[J].China Water & Wastewater,2022,38(3):43-49.
污水厂再生水中耐氯大肠杆菌筛查及细菌耐药性分析
- Title:
- Isolation of Chlorine-resistant Escherichia coli and Bacterial Antibiotic Resistance Surveillance from Reclaimed Wastewater of Municipal Wastewater Treatment Plants
- Keywords:
- wastewater treatment plant; reclaimed wastewater; chlorine-resistant E. coli; antibiotic resistance
- 摘要:
- 为研究再生水回用过程中的生物安全风险，对两座城镇污水处理厂再生水样品中人源微生物污染、耐氯大肠杆菌分布及细菌耐药性情况进行调查分析。结果显示，85.7%的再生水样品存在人源微生物污染风险；再生水中共分离到8株耐氯大肠杆菌，占所分离大肠杆菌的20%，为我国首次报道该菌存在，该菌的出现对水处理过程中微生物的有效消杀提出了挑战；50%的大肠杆菌至少耐受一种抗生素，10%耐受至少3种抗生素，3株大肠杆菌呈ESBL阳性，说明再生水具有传播耐药性细菌风险。因此，污水处理厂应优化处理工艺，提高对耐氯菌的消杀水平，并通过多部门联合治理以控制耐药菌传播，提高再生水的生物安全性。
- Abstract:
- To evaluate the microbial risk associated with wastewater reuse, reclaimed wastewater samples from two municipal wastewater treatment plants were collected to study their human fecal pollution risk and distribution of isolated chlorine-resistant Escherichia coli (E. coli), and determine their antibiotic resistance. The results showed that 85.7% of the reclaimed wastewater samples had potential human fecal pollution; eight chlorine?resistant E. coli were identified constituting 20% of all E. coli, which was the first report of this strain in China posing great challenge to the disinfection efficiency in wastewater treatment process; 50% of the isolated E. coli strains were resistant to a least one of the 21 antibiotics tested with only 10% resistant to more than three antibiotics and three ESBL producing E. coli were identified suggesting that reclaimed wastewater might act as a route for antibiotic resistance dissemination. The wastewater treatment plants should adopt multiple approaches to improve their disinfections efficiency to deal with the challenges from chlorine?resistant microbes and work with related parties to control the spread of bacteria antibiotic resistance to protect the microbial safety of reclaimed wastewater.
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