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Do Alternate Bacterial Indicators and Pathogens Increase after Centrifuge Dewatering of Anaerobically Digested Biosolids?
Author(s) -
Chen YenChih,
Murthy Sudhir N.,
Hendrickson Donald,
Higgins Matthew J.
Publication year - 2011
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143010x12851009156763
Subject(s) - biosolids , fecal coliform , indicator bacteria , salmonella , dewatering , mesophile , feces , microbiology and biotechnology , indicator organism , coliform bacteria , escherichia coli , biology , bacteria , food science , veterinary medicine , environmental science , environmental engineering , ecology , water quality , medicine , biochemistry , genetics , geotechnical engineering , gene , engineering
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.