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Title: Influence of trace erythromycin and erythromycin-H2O on carbon and nutrients removal and on resistance selection in sequencing batch reactors (SBRs)

Journal Article · · Applied Microbiology and Biotechnology
 [1];  [2];  [3];  [4];  [5];  [5];  [3]
  1. National Univ. of Singapore (Singapore). Division of Environmental Science and Engineering; OSTI
  2. Univ. of California, Berkeley, CA (United States). Dept. of Civil and Environmental Engineering
  3. National Univ. of Singapore (Singapore). Division of Environmental Science and Engineering
  4. Univ. of California, Berkeley, CA (United States). Dept. of Civil and Environmental Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Science Division
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Science Division

Three sequencing batch reactors (SBRs) were operated in parallel to study the effects of trace erythromycin (ERY) and ERY-H2O on the treatment of a synthetic wastewater. Through monitoring (1) daily effluents and (2) concentrations of nitrogen (N) and phosphorous (P) in certain batch cycles of the three reactors operated from transient to steady states, the removal of carbon, N, and P was affected negligibly by ERY (100µg/L) or ERY-H2O (50µg/L) when compared with the control reactor. However, through analyzing microbial communities of the three steady state SBRs on high-density microarrays (PhyloChip), ERY, and ERY-H2O had pronounced effects on the community composition of bacteria related to N and P removal, leading to diversity loss and abundance change. The above observations indicated that resistant bacteria were selected upon exposure to ERY or ERY-H2O. Short-term batch experiments further proved the resistance and demonstrated that ammonium oxidation (56–95%) was inhibited more significantly than nitrite oxidation (18–61%) in the presence of ERY (100, 400, or 800µg/L). Therefore, the presence of ERY or ERY-H2O (at µg/L levels) shifted the microbial community and selected resistant bacteria, which may account for the negligible influence of the antibiotic ERY or its derivative ERY-H2O (at µg/L levels) on carbon, N, and P removal in the SBRs.

Research Organization:
Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1816018
Journal Information:
Applied Microbiology and Biotechnology, Journal Name: Applied Microbiology and Biotechnology Journal Issue: 1 Vol. 85; ISSN 0175-7598
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Potential impacts of disinfection processes on elimination and deactivation of antibiotic resistance genes during water and wastewater treatment journal January 2012