Environmental Science and Pollution Research

, Volume 25, Issue 14, pp 13956–13963 | Cite as

Fate of antibiotic and metal resistance genes during two-phase anaerobic digestion of residue sludge revealed by metagenomic approach

  • Ying Wu
  • Erping Cui
  • Yiru Zuo
  • Weixiao Cheng
  • Hong Chen
Research Article

Abstract

The prevalence and persistence of antibiotic resistance genes in wastewater treatment plants (WWTPs) is of growing interest, and residual sludge is among the main sources for the release of antibiotic resistance genes (ARGs). Moreover, heavy metals concentrated in dense microbial communities of sludge could potentially favor co-selection of ARGs and metal resistance genes (MRGs). Residual sludge treatment is needed to limit the spread of resistance from WWTPs into the environment. This study aimed to explore the fate of ARGs and MRGs during thermophilic two-phase (acidogenic/methanogenic phase) anaerobic digestion by metagenomic analysis. The occurrence and abundance of mobile genetic elements were also determined based on the SEED database. Among the 27 major ARG subtypes detected in feed sludge, large reductions (> 50%) in 6 ARG subtypes were achieved by acidogenic phase (AP), while 63.0% of the ARG subtypes proliferated in the following methanogenic phase (MP). In contrast, a 2.8-fold increase in total MRG abundance was found in AP, while the total abundance during MP decreased to the same order of magnitude as in feed sludge. The distinct dynamics of ARGs and MRGs during the two-phase anaerobic digestion are noteworthy, and more specific treatments are required to limit their proliferation in the environment.

Keywords

Antibiotic resistance genes Metal resistance genes Two-phase anaerobic digestion Metagenomic analysis 

Notes

Acknowledgements

The authors would like to thank the managers of Linan municipal wastewater treatment plant for providing raw sludge, and the support of the IBM high performance computing cluster of Bio-macromolecules Analysis Lab, Zhejiang University.

Funding information

This work was supported by the Natural Science Foundation of China (21677121, 41571130064).

Supplementary material

11356_2018_1598_MOESM1_ESM.doc (880 kb)
ESM 1 (DOC 879 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Ying Wu
    • 1
  • Erping Cui
    • 1
  • Yiru Zuo
    • 1
  • Weixiao Cheng
    • 1
  • Hong Chen
    • 1
  1. 1.Department of Environmental Engineering, College of Environmental and Resource SciencesZhejiang UniversityHangzhouPeople’s Republic of China

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