Effect of anaerobic digestion temperature on odour, coliforms and chlortetracycline in swine manure or monensin in cattle manure

J Appl Microbiol. 2012 Apr;112(4):705-15. doi: 10.1111/j.1365-2672.2012.05250.x. Epub 2012 Mar 6.

Abstract

Aims: This study evaluated the effect of anaerobic digestion at 22, 38 and 55°C on odour, coliforms and chlortetracycline (CTC) in swine manure or monensin (MON) in cattle manure.

Methods and results: Swine or cattle were fed the respective growth promotant, manure was collected, and 2-l laboratory methane digesters were established at the various temperatures and sampled over 25 or 28 days. After 21 days, the concentration of CTC in the 22, 38 and 55°C swine digester slurries decreased 7, 80 and 98%, respectively. Coliforms in the 22°C digester slurries were still viable after 25 days; however, they were not detectable in the 38 and 55°C slurries after 3 and 1 days, respectively. After 28 days, the concentration of MON in the 22, 38 and 55°C cattle digester slurries decreased 3, 8 and 27%, respectively. Coliforms in the 22°C cattle digester slurries were still viable after 28 days; however, they were not detectable in the 38 and 55°C slurries after 14 and 1 days, respectively.

Conclusions: These studies indicate that anaerobic digestion at 38 or 55°C may be an effective treatment to reduce coliforms and CTC; however, it is not an effective treatment to reduce MON.

Significance and impact of the study: More studies are needed to determine which pharmaceuticals are susceptible to degradation by a specific manure treatment to prevent negative environmental consequences.

MeSH terms

  • Animals
  • Cattle*
  • Chlortetracycline / analysis
  • Chlortetracycline / metabolism*
  • Digestion
  • Manure / microbiology*
  • Methane / metabolism
  • Monensin / analysis
  • Monensin / metabolism*
  • Odorants
  • Swine*
  • Temperature

Substances

  • Manure
  • Monensin
  • Methane
  • Chlortetracycline