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Die-off of enteric bacterial pathogens during mesophilic anaerobic digestion

Horan, N.J., Fletcher, L., Betmal, S.M., Wilks, S.A. and Keevil, C.W. (2004) Die-off of enteric bacterial pathogens during mesophilic anaerobic digestion Water Research, 38, (5), pp. 1113-1120. (doi:10.1016/j.watres.2003.12.004).

Record type: Article


Conventionally treated sewage sludge may contain high concentrations of potentially pathogenic microorganisms and additional treatment is required to minimise the risks to health if it is to be recycled to agricultural land. Mesophilic anaerobic digestion (MAD) is the most widely used process in the UK for stabilising sludge prior to agricultural recycling, but little is known about the fate of a number of enteric pathogens as the sludge passes through the treatment processes. The aim of this study was to determine the efficiency of MAD in removing the bacterial enteric pathogens, Salmonella senftenberg, Listeria monocytogenes and Campylobacter jejuni which were added as a spike to the digester feedstock, together with the die-off of indigenous Escherichia coli already present in the sludge. The primary sludge digestion stage of MAD was found to achieve a log removal of 1.66 for E. coli, 2.23 for L. monocytogenes and 2.23 for S. senftenberg. However, the extent of die-off was a function of the numbers of pathogens in the feed and as these increased the log removal also increased. The numbers of C. jejuni were not affected by primary sludge digestion. Additional die-off was provided by secondary sludge digestion with log removals of 1.70 for E. coli, 2.10 for S. senftenberg and 0.36 for C. jejuni.

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Published date: March 2004
Keywords: mesophilic anaerobic digestion, sludge, E.coli, Salmonella, Listeria, Campylobacter


Local EPrints ID: 56098
ISSN: 0043-1354
PURE UUID: b2e2e9fe-41c8-460a-950a-30c328b43920
ORCID for S.A. Wilks: ORCID iD
ORCID for C.W. Keevil: ORCID iD

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Date deposited: 07 Aug 2008
Last modified: 17 Jul 2017 14:31

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Author: N.J. Horan
Author: L. Fletcher
Author: S.M. Betmal
Author: S.A. Wilks ORCID iD
Author: C.W. Keevil ORCID iD

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