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Decrease of enteric micro-organisms from rural sewage sludge during their composting in straw mixture.

A-M Pourcher1, P Morand, F Picard-Bonnaud

  • 1UMR MA. 105, UFR Sciences, Paysages et Biodiversité, Laboratoire des Sciences de l'Environnement et de l'Aménagement, Université d'Angers, 2 boulevard Lavoisier, 49045 Angers Cedex 01, France. pourcher@univ-angers.fr

Journal of Applied Microbiology
|August 20, 2005
PubMed
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Composting rural sewage sludge with straw for 7 months effectively reduces enteric microorganisms, including pathogenic bacteria and viable nematode eggs, making it safe for disposal. This process significantly lowers fecal indicators like Escherichia coli and enterococci to undetectable levels.

Area of Science:

  • Environmental Microbiology
  • Waste Management
  • Public Health

Background:

  • Rural sewage sludge can harbor enteric microorganisms and pathogens.
  • Composting is a potential method for sludge hygienization.

Purpose of the Study:

  • To evaluate the reduction of enteric microorganisms in rural sewage sludge composted with straw for 7 months.
  • To assess the inactivation of viable nematode eggs, enteroviruses, fecal indicators (Escherichia coli, enterococci), and pathogenic bacteria (Listeria monocytogenes, Salmonella sp., Clostridium perfringens).

Main Methods:

  • Sewage sludge was composted with straw for 7 months.
  • Microbial populations and physico-chemical parameters were monitored monthly.
  • Samples were taken from different locations within the compost pile.

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Main Results:

  • Infectious enteroviruses were inactivated rapidly, with genomes detectable up to the third turning.
  • Escherichia coli and enterococci counts decreased by 4 log(10).
  • Salmonella showed a higher decay rate than Listeria monocytogenes; Clostridium perfringens counts reached levels similar to fecal indicators.

Conclusions:

  • Composting sludge with straw significantly reduces enteric microorganisms, meeting French legislative standards.
  • The final compost product had undetectable levels of Salmonella, enteroviruses, and viable nematode eggs.
  • Composting is an effective hygienization method for rural wastewater treatment sludge when straw is readily available.