Response of the Bacterial Community and Antibiotic Resistance in Overnight Stagnant Water from a Municipal Pipeline

Minglu Zhang, Mengyao Xu, Shaofeng Xu, Lingyue Zhang, Kaizong Lin, Lei Zhang, Miao Bai, Can Zhang and He Zhou
Additional contact information
Minglu Zhang: Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
Mengyao Xu: Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
Shaofeng Xu: Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
Lingyue Zhang: Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
Kaizong Lin: Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
Lei Zhang: Center for Disease Control and Prevention of Chinese PLA, Beijing 100071, China
Miao Bai: Center for Disease Control and Prevention of Chinese PLA, Beijing 100071, China
Can Zhang: Center for Disease Control and Prevention of Chinese PLA, Beijing 100071, China
He Zhou: Beijing Boda Water Company, Beijing 100176, China

IJERPH, 2020, vol. 17, issue 6, 1-13

Abstract: Although drinking water safety has raised considerable concern, to date, the hidden health risks in newly released overnight water from a municipal pipeline have seldom received attention. In this study, bacterial community composition and the response of antibiotic-resistant bacteria (ARB) to ciprofloxacin, azithromycin, tetracycline, penicillin, and cephalosporin in overnight stagnant water were analyzed. With increases in heterotrophic bacteria plate count (HPC) during water stagnation, the numbers of ARB and the ARB/HPC ratios for the five antibiotics in resident water were observed to increase, which illustrated that the prevalence of ARB rose in the pipe network water during stagnation time (ST). Furthermore, during water stagnation for 12 h, an increase in bacteria related to fermentation was also observed. When the ST rose to 48 h, the fermentation bacteria become non-significant, and this was related to the exchange of pipe network water during daytime stagnation within the 48-h period. The antibiotic resistance index (ARI) showed that tetracycline had the highest resistance level in fresh water, and then decreased during water stagnation. When ST increased to 12 h, all ARI values of the five antibiotics were low, which was associated with changes in parameters during water retention and reduced resistance during short-term stagnation. When the ST increased to 24 and 48 h, the resistance to most antibiotics (except for tetracycline) increased, which showed that increasing antibiotic resistance is caused by the formation of biofilms in the pipeline during water stagnation.

Keywords: drinking water; overnight stagnation; pipeline water; heterotrophic plate count (HPC); antibiotics; bacterial community composition (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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