A COMPARATIVE PERSPECTIVE OF US AND UK THINKING ON E COLI REACTIVATION IN DIGESTION AND DEWATERING

Proceedings

A COMPARATIVE PERSPECTIVE OF US AND UK THINKING ON E COLI REACTIVATION IN DIGESTION AND DEWATERING

Panter, K.
Ebcor Ltd, UK
(free)

Since 2003 a number of WWTPs have observed elevation of E Coli densities following
dewatering of digested sludge by high solids centrifuges, mainly in the US. A recent study by
WERF shows that this applies to 4 out of 7 facilities studied in detail. A review of all the
literature shows that the phenomenon occurs in 31 out of 33 facilities and includes those with
thermophilic digestion or pre-pasteurisation. The VBNC hypothesis for faecal reactivation is
explained. The US regulations apply to the use of product at point of use or disposal and the
regrowth of E Coli makes testing and mitigation of non-conforming sludges necessary.
The phenomenon occurs also in UK – but there is no collected data or research into the matter.
There is a need to take reactivation into account when considering HACCP compliance.

KEYWORDS
E Coli, Anaerobic Digestion, Dewatering, Reactivation, HACCP.

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