Assessment of Salmonella typhimurium growth in class a biosolids and soil/biosolid mixtures

Nohelia Castro Del Campo, Ian L. Pepper, Charles P. Gerba

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The potential of Salmonella typhimurlum regrowth in Class A biosolid pellets and compost after land application was assessed. Mixtures of soil, soil plus biosolids, and biosolids were inoculated with two different concentrations and monitored during a period of 20 days. No Salmonella growth occurred in any of the soil/biosolid mixtures regardless of inoculum size or moisture content. No growth occurred in any of the biosolids with a moisture content of 20% except the pellets from Texas when inoculated with 10,000 colony forming units/g. Growth of Salmonella did occur in all of the Class A products under saturated conditions. Under all moisture conditions indigenous microflora increased In numbers in the biosolids, soil and biosolid/soll mixtures. In conclusion, these results suggest that while regrowth of Salmonella in biosolids may occur under saturated conditions it does not occur after Class A biosolids land application at typical agronomic rates.

Original languageEnglish (US)
Pages (from-to)83-88
Number of pages6
JournalJournal of Residuals Science and Technology
Issue number2
StatePublished - Apr 2007

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal


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