OPTIMISATION OF PATHOGEN DECAY FOR SECONDARY SLUDGE DIGESTION

Proceedings

OPTIMISATION OF PATHOGEN DECAY FOR SECONDARY SLUDGE DIGESTION

Jeremy Black, Manocher Asaadi and Terry Bane
Thames Water Utilities Ltd
(free)

Pathogen reduction in digested sewage sludges is thought to follow a first order decay rate mechanism. On this basis, Thames Water has trialled and now implemented continuous secondary digestion of sludge at eight sites. The continuous secondary digestion process has lower capital costs and a simpler operations routine than the batch storage process.

Post commissioning optimisation of the secondary digestion process has revealed that the pathogen decay rate constant varies with temperature.

This paper investigates the temperature dependency of pathogen decay in secondary digestion, and provides a tool for assessing tank performance. This has been used to optimise tank design, with particular attention to tank construction and mixing regime.

KEY WORDS Decay Rate, Digestion, E.Coli, Mixing, Optimisation, Pathogen, Secondary Digestion, Sewage Sludge, Temperature.

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