Sludge and Waste Management
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Pathogens in Biosolids - The Fate of Pathogens in Sewage Treatment
Price: £150
Ref: 02/SL/06/6
ISBN: 1-84507 2612
This study has evaluated the survival of a number of enteric pathogens added to thickened sewage sludge which was subjected to treatment by a range of processes operated under Code of Practice* conditions. These processes were: mesophilic anaerobic digestion (MAD), pasteurisation followed by MAD, lime stabilisation and composting. The experiments were carried out at bench-scale with additions of Salmonella senftenberg, S. dublin, S. enteriditis, S. typhimurium, Listeria monocytogenes, Campylobacter jejuni, Cryptosporidium parvum and poliovirus with the aim of achieving 106 organisms in the sludge. In addition the numbers of indigenous Escherichia coli were determined, not only in the bench-scale reactors but also at nominated full-scale plants that were operated under Code of Practice conditions; thermal drying was evaluated at full-scale only. Indigenous E. coli were shown to have similar survival properties to the verotoxigenic strain of E. coli O157 and could act as an indicator for this pathogen.
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Pathogens in Biosolids - Microbiological Risk Assessment
03/SL/06/7 - ISBN: 1-84057-294-9Biosolids represent the solid fraction of sewage and potentially contain a number of human and animal pathogens. This report describes a microbiological risk assessment to quantify the risks to humans from consumption of root... More...
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