Do alternate bacterial indicators and pathogens increase after centrifuge dewatering of anaerobically digested biosolids?

Yen Chih Chen, Sudhir N. Murthy, Donald Hendrickson, Matthew J. Higgins

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The objectives of this research were to evaluate the potential for sudden increase and/or regrowth of alternative bacteria as either indicators or pathogens after dewatering of thermophilic and mesophilically digested biosolids. The results showed that, in general, for thermophilic processes, even when a statistically significant (p<0.05) sudden increase and regrowth occurred for fecal coliforms, Escherichia coli, and Enterococci, it did not occur for Salmonella or Aeromonas. For the mesophilic process evaluated, sudden increase did not occur, but regrowth occurred for fecal coliforms, E. coli, Enterococci, and Salmonella. The results have implications for Class A and B biosolids regulations, as both fecal coliform and Salmonella are part of the regulatory limits. The results also suggest that the public health risks are minimal, as a result of the potential sudden increase and regrowth that may occur.

Original languageEnglish (US)
Pages (from-to)2057-2066
Number of pages10
JournalWater Environment Research
Volume83
Issue number11
DOIs
StatePublished - Nov 2011

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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