Antibiotic resistance genes in swine manure slurry as affected by pit additives and facility disinfectants

Maria C. Hall, Jon Duerschner, John E. Gilley, Amy M. Schmidt, Shannon L. Bartelt-Hunt, Daniel D. Snow, Kent M. Eskridge, Xu Li

Research output: Contribution to journalArticlepeer-review

Abstract

Manure storage facilities are critical control points to reduce antibiotic resistance genes (ARGs) in swine manure slurry before the slurry is land applied. However, little is known about how exogenous chemicals entering the manure storage facilities may affect the fate of ARGs. The objective of this study was to analyze the impact of six commonly used pit additives and four facility disinfectants on the concentration of ARGs in swine manure slurry. Bench scale reactors, each containing approximately 50 L of liquid swine manure, were dosed with additives or disinfectants and were sampled for 40 days. Seven antibiotic resistance genes along with the intI1 gene and the 16S rRNA gene were monitored. Out of the six additives tested, Sludge Away significantly reduced the time-averaged absolute abundance of erm(C), erm(F), tet(Q), and the 16S rRNA gene as compared to the no additive control. Out of the four disinfectants tested, Tek-Trol significantly reduced the time-averaged absolute abundance of erm(B), erm(C), erm(F), intI1, tet(Q), and tet(X) than did the no-disinfectant control. According to Spearman's rank correlation, three genes erm(F), tet(Q), and tet(X) showed a strong to perfectly positive correlation and the two genes erm(B) and tet(O) showed a moderate to strong correlation in both the additive and disinfectant tests. Overall, the disinfectants were more effective in controlling the absolute abundance of ARGs than were the pit additives.

Original languageEnglish (US)
Article number143287
JournalScience of the Total Environment
Volume761
DOIs
StatePublished - Mar 20 2021

Keywords

  • Antibiotic resistance genes
  • Facility disinfectants
  • Pit additives
  • Swine manure slurry

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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