Influence of four antimicrobials on methane-producing archaea and sulfate-reducing bacteria in anaerobic granular sludge

Jingru Du, Yong Hu, Weikang Qi, Yanlong Zhang, Zhaoqian Jing, Michael Norton, Yu You Li

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The influence of Cephalexin (CLX), Tetracycline (TC), Erythromycin (ERY) and Sulfathiazole (ST) on methane-producing archaea (MPA) and sulfate-reducing bacteria (SRB) in anaerobic sludge was investigated using acetate or ethanol as substrate. With antimicrobial concentrations below 400mgL-1, the relative specific methanogenic activity (SMA) was above 50%, so that the antimicrobials exerted slight effects on archaea. However ERY and ST at 400mgL-1 caused a 74.5% and 57.6% inhibition to specific sulfidogenic activity (SSA) when the sludge granules were disrupted and ethanol used as substrate. After disruption, microbial tolerance to antimicrobials decreased, but the rate at which MPA utilized acetate and ethanol increased from 0.95gCOD·(gVSS{dot operator}d)-1 to 1.45gCOD·(gVSS{dot operator}d)-1 and 0.90gCOD·(gVSS{dot operator}d)-1 to 1.15gCOD·(gVSS{dot operator}d)-1 respectively. The ethanol utilization rate for SRB also increased after disruption from 0.35gCOD·(gVSS{dot operator}d)-1 to 0.46gCOD·(gVSS{dot operator}d)-1. Removal rates for CLX approaching 20.0% and 25.0% were obtained used acetate and ethanol respectively. The disintegration of granules improved the CLX removal rate to 65% and 78%, but ST was not removed during this process.

Original languageEnglish
Pages (from-to)184-190
Number of pages7
JournalChemosphere
Volume140
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Anaerobic granular sludge
  • Antimicrobial
  • Methane-producing archaea
  • Sulfate-reducing bacteria

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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