Destruction of Salmonellas, Enteroviruses and Ova of Parasites in Wastewater Sludge by Pasteurisation and Anaerobic Digestion

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Abstract
In laboratory experiments, Salmonella duesseldorf, added to sludge, was inactivated by mesophilic (35 °C) and thermophilic (48 °C) anaerobic digestion, but the viability of Ascaris suum ova was destroyed only by digestion at 49°C or by heating to 55°C for 15 minutes. When heat treatment (47-51°C) gave incomplete destruction of viability, subsequent mesophilic digestion reduced viability further. Salmonella spp. and cytopathic enteroviruses in thickened raw sludge were completely destroyed by pasteurisation at 70°C for 30 minutes in the new full-scale sludge treatment plant at Colburn, Yorkshire, which uses submerged combustion of gas from the following mesophilic digester as the sole source of heat. The data obtained during evaluation of this plant highlight the need for the control systems to be designed for intermittent operation to avoid incomplete treatment immediately after starting-up from cold.

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